From patchwork Thu Apr 20 14:20:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 68073 X-Patchwork-Delegate: fweimer@redhat.com Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 239973857351 for ; Thu, 20 Apr 2023 14:21:22 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 239973857351 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1682000482; bh=9lh0BpoPsL1fHlv8yGGDFbAYWf4fwZUmFAEEpBDVtF8=; h=To:Cc:Subject:Date:In-Reply-To:References:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From:Reply-To:From; b=Zk68LaaUTw+l6IcLP0uJqlXj/iyN9U93jQ0qeHqBdMowLx2435BWL4uvJiNAEeBoH Lzg+CACa0mF162EPbAaqtt067KPxZpojaf0Ob/dHPKcQEySv+AMAKYuLbNhfDcU7Hr awEEP7OGaEUQbLl222mz94ueX7tz7O8NoJW4tOkg= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-oi1-x230.google.com (mail-oi1-x230.google.com [IPv6:2607:f8b0:4864:20::230]) by sourceware.org (Postfix) with ESMTPS id 657793857720 for ; Thu, 20 Apr 2023 14:20:48 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 657793857720 Received: by mail-oi1-x230.google.com with SMTP id 5614622812f47-38c35975545so718009b6e.1 for ; Thu, 20 Apr 2023 07:20:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682000447; x=1684592447; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=9lh0BpoPsL1fHlv8yGGDFbAYWf4fwZUmFAEEpBDVtF8=; b=ViCCbucbI6FhUhNElp2qljCx5SIwNHglzugBd/HzUf7+aI+s8MgxYra4KwruGnzcrm F2HVyywza9e0IAhasHqspYa3BCrb/2dDg6Z2xyrxPe0kjAaZZLqYuUUV+qVJt9fBA4eu jLcijOwmUGhItBwuu3mt2TDb9j/DYrCiBv41eoo6RNaJXntpC94En3duw5LaYVztyX46 wmDJn8cNp370EDF9nu69THKhPQE3N2+RuMYvqzAuOKQWHKFKqPi5jPLNxuRRg8dj1bI6 xvq3zq/l3I66Vvokoy0roLrwbagUph5ndSSpoUSbTe5jDPm3z0yak78WUmib70M0uFUv xv5g== X-Gm-Message-State: AAQBX9c3ZUBn2J5U4MPO3iWo2QC4qiOmw8Q4FhWxp3pCCKDii939e5Vi 0LmWxfGsdCRtYVweLFk/dJ3HXuC8DEs+1H87rt2R3A== X-Google-Smtp-Source: AKy350adY7YBCcxufxG8XrIICPomSFDXnzIv/JUUJv7UHR84Xw1O/w6jkkHdwP276Hj2TgW0ATu0wA== X-Received: by 2002:aca:a856:0:b0:38e:6ba9:6491 with SMTP id r83-20020acaa856000000b0038e6ba96491mr1017101oie.50.1682000445402; Thu, 20 Apr 2023 07:20:45 -0700 (PDT) Received: from mandiga.. ([2804:1b3:a7c3:333:c0e2:699e:18c9:eb96]) by smtp.gmail.com with ESMTPSA id b35-20020a4a98e6000000b0051a6cb524b6sm668159ooj.2.2023.04.20.07.20.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Apr 2023 07:20:44 -0700 (PDT) To: libc-alpha@sourceware.org Cc: Luca Boccassi Subject: [PATCH v2 1/3] posix: Add pidfd_spawn and pidfd_spawnp (BZ# 30349) Date: Thu, 20 Apr 2023 11:20:35 -0300 Message-Id: <20230420142037.4063169-2-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230420142037.4063169-1-adhemerval.zanella@linaro.org> References: <20230420142037.4063169-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Returning a pidfd allows a process to keep a race-free handle to a child process, otherwise the caller will need to either use pidfd_open (which still might be subject to TOCTOU) or keep using the old racy interface. The implementation makes sure that kernel must support the complete pidfd interface, meaning that waitid (P_PIDFD) should be supported (added on Linux 5.4). It ensure that non racy workaround is required (such as reading procfs fdinfo pid to use along with old wait interfaces). If kernel does not have the required support the interface returns ENOSYS. These interfaces are similar to the posix_spawn and posix_spawnp, with the only different diferent being it returns a process file descriptor (int) instead of process ID (pid_t). Their prototypes are: int pidfd_spawn (int *restrict pidfd, const char *restrict file, const posix_spawn_file_actions_t *restrict facts, const posix_spawnattr_t *restrict attrp, char *const argv[restrict], char *const envp[restrict]) int pidfd_spawnp (int *restrict pidfd, const char *restrict path, const posix_spawn_file_actions_t *restrict facts, const posix_spawnattr_t *restrict attrp, char *const argv[restrict_arr], char *const envp[restrict_arr]); A new symbol is used instead of a posix_spawn extension to avoid possible issue with language bindings that might track the return argument lifetime. Although, on Linux pid_t and int are interchangeable, POSIX only state that pid_t should be a signed interger. Both symbols reuse the posix_spawn posix_spawn_file_actions_t and posix_spawnattr_t, to void rehash posix_spawn API or add a new one. It also mean that both interfaces support the same attribute and file actions, and a new flag or file actions on posix_spawn is also added automatically for pidfd_spawn. Also, using posix_spawn plumbering allows to reuse most of the current testing with some changes: - waitid is used instead of waitpid, since it is a more generic interface. - tst-posix_spawn-setsid.c is adapted to take in consideration that caller can check for session id directly. The test now spawn itself and write the session id a file instead. - tst-spawn3.c need to know where pidfd_spawn is used so it keep an extra file description ununsed. Checked on x86_64-linux-gnu on Linux 4.15 (no CLONE_PID or waitid support), Linux 5.15 (only clone support), and Linux 5.19 (full support including clone3). --- NEWS | 7 + bits/spawn_ext.h | 21 +++ include/clone_internal.h | 4 + manual/process.texi | 14 +- posix/Makefile | 2 + posix/spawn.h | 2 + posix/spawn_int.h | 3 +- posix/tst-posix_spawn-setsid.c | 168 +++++++++++++----- posix/tst-spawn-chdir.c | 15 +- posix/tst-spawn.c | 24 +-- posix/tst-spawn.h | 36 ++++ posix/tst-spawn2.c | 17 +- posix/tst-spawn3.c | 100 ++++++----- posix/tst-spawn4.c | 7 +- posix/tst-spawn5.c | 14 +- posix/tst-spawn6.c | 15 +- posix/tst-spawn7.c | 13 +- sysdeps/unix/sysv/linux/Makefile | 20 +++ sysdeps/unix/sysv/linux/Versions | 4 + sysdeps/unix/sysv/linux/aarch64/libc.abilist | 2 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 2 + sysdeps/unix/sysv/linux/arc/libc.abilist | 2 + sysdeps/unix/sysv/linux/arm/be/libc.abilist | 2 + sysdeps/unix/sysv/linux/arm/le/libc.abilist | 2 + sysdeps/unix/sysv/linux/bits/spawn_ext.h | 45 +++++ sysdeps/unix/sysv/linux/clone-pidfd-support.c | 58 ++++++ sysdeps/unix/sysv/linux/csky/libc.abilist | 2 + sysdeps/unix/sysv/linux/hppa/libc.abilist | 2 + sysdeps/unix/sysv/linux/i386/libc.abilist | 2 + sysdeps/unix/sysv/linux/ia64/libc.abilist | 2 + .../sysv/linux/loongarch/lp64/libc.abilist | 2 + .../sysv/linux/m68k/coldfire/libc.abilist | 2 + .../unix/sysv/linux/m68k/m680x0/libc.abilist | 2 + .../sysv/linux/microblaze/be/libc.abilist | 2 + .../sysv/linux/microblaze/le/libc.abilist | 2 + .../sysv/linux/mips/mips32/fpu/libc.abilist | 2 + .../sysv/linux/mips/mips32/nofpu/libc.abilist | 2 + .../sysv/linux/mips/mips64/n32/libc.abilist | 2 + .../sysv/linux/mips/mips64/n64/libc.abilist | 2 + sysdeps/unix/sysv/linux/nios2/libc.abilist | 2 + sysdeps/unix/sysv/linux/or1k/libc.abilist | 2 + sysdeps/unix/sysv/linux/pidfd_spawn.c | 30 ++++ sysdeps/unix/sysv/linux/pidfd_spawnp.c | 30 ++++ .../linux/powerpc/powerpc32/fpu/libc.abilist | 2 + .../powerpc/powerpc32/nofpu/libc.abilist | 2 + .../linux/powerpc/powerpc64/be/libc.abilist | 2 + .../linux/powerpc/powerpc64/le/libc.abilist | 2 + .../unix/sysv/linux/riscv/rv32/libc.abilist | 2 + .../unix/sysv/linux/riscv/rv64/libc.abilist | 2 + .../unix/sysv/linux/s390/s390-32/libc.abilist | 2 + .../unix/sysv/linux/s390/s390-64/libc.abilist | 2 + sysdeps/unix/sysv/linux/sh/be/libc.abilist | 2 + sysdeps/unix/sysv/linux/sh/le/libc.abilist | 2 + .../sysv/linux/sparc/sparc32/libc.abilist | 2 + .../sysv/linux/sparc/sparc64/libc.abilist | 2 + sysdeps/unix/sysv/linux/spawni.c | 20 ++- .../sysv/linux/tst-posix_spawn-setsid-pidfd.c | 20 +++ .../unix/sysv/linux/tst-spawn-chdir-pidfd.c | 20 +++ sysdeps/unix/sysv/linux/tst-spawn-pidfd.c | 20 +++ sysdeps/unix/sysv/linux/tst-spawn-pidfd.h | 63 +++++++ sysdeps/unix/sysv/linux/tst-spawn2-pidfd.c | 20 +++ sysdeps/unix/sysv/linux/tst-spawn3-pidfd.c | 20 +++ sysdeps/unix/sysv/linux/tst-spawn4-pidfd.c | 20 +++ sysdeps/unix/sysv/linux/tst-spawn5-pidfd.c | 20 +++ sysdeps/unix/sysv/linux/tst-spawn6-pidfd.c | 20 +++ sysdeps/unix/sysv/linux/tst-spawn7-pidfd.c | 20 +++ .../unix/sysv/linux/x86_64/64/libc.abilist | 2 + .../unix/sysv/linux/x86_64/x32/libc.abilist | 2 + 68 files changed, 829 insertions(+), 151 deletions(-) create mode 100644 bits/spawn_ext.h create mode 100644 posix/tst-spawn.h create mode 100644 sysdeps/unix/sysv/linux/bits/spawn_ext.h create mode 100644 sysdeps/unix/sysv/linux/clone-pidfd-support.c create mode 100644 sysdeps/unix/sysv/linux/pidfd_spawn.c create mode 100644 sysdeps/unix/sysv/linux/pidfd_spawnp.c create mode 100644 sysdeps/unix/sysv/linux/tst-posix_spawn-setsid-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn-chdir-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn-pidfd.h create mode 100644 sysdeps/unix/sysv/linux/tst-spawn2-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn3-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn4-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn5-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn6-pidfd.c create mode 100644 sysdeps/unix/sysv/linux/tst-spawn7-pidfd.c diff --git a/NEWS b/NEWS index 83d082afad..081d0180f4 100644 --- a/NEWS +++ b/NEWS @@ -21,6 +21,13 @@ Major new features: * PRIb* and PRIB* macros from C2X have been added to . +* On Linux, the pidfd_spawn and pidfd_spawp function have been added. + They have similar prototype and semantic as posix_spawn, but instead of + returning a process ID, they return a file descriptor that can be used + along other pidfd function (like pidfd_send_signal, poll, or waitid). + The pidfd functionality avoid the issue of PID reuse with traditional + posix_spawn interface. + Deprecated and removed features, and other changes affecting compatibility: * In the Linux kernel for the hppa/parisc architecture some of the diff --git a/bits/spawn_ext.h b/bits/spawn_ext.h new file mode 100644 index 0000000000..75b504a768 --- /dev/null +++ b/bits/spawn_ext.h @@ -0,0 +1,21 @@ +/* POSIX spawn extensions. Generic version. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _SPAWN_H +# error "Never include directly; use instead." +#endif diff --git a/include/clone_internal.h b/include/clone_internal.h index dd380f119e..54df6c8917 100644 --- a/include/clone_internal.h +++ b/include/clone_internal.h @@ -35,6 +35,10 @@ extern int __clone_internal_fallback (struct clone_args *__cl_args, void *__arg) attribute_hidden; +/* Return whether the kernel supports pid file descriptor, including clone + with CLONE_PIDFD and waitid with P_PIDFD. */ +extern bool __clone_pidfd_supported (void) attribute_hidden; + #ifndef _ISOMAC libc_hidden_proto (__clone3) libc_hidden_proto (__clone_internal) diff --git a/manual/process.texi b/manual/process.texi index 9307379194..927aebbe3d 100644 --- a/manual/process.texi +++ b/manual/process.texi @@ -136,13 +136,13 @@ creating a process and making it run another program. @cindex parent process @cindex subprocess A new processes is created when one of the functions -@code{posix_spawn}, @code{fork}, @code{_Fork} or @code{vfork} is called. -(The @code{system} and @code{popen} also create new processes internally.) -Due to the name of the @code{fork} function, the act of creating a new -process is sometimes called @dfn{forking} a process. Each new process -(the @dfn{child process} or @dfn{subprocess}) is allocated a process -ID, distinct from the process ID of the parent process. @xref{Process -Identification}. +@code{posix_spawn}, @code{fork}, @code{_Fork}, @code{vfork}, or +@code{pidfd_spawn} is called. (The @code{system} and @code{popen} also +create new processes internally.) Due to the name of the @code{fork} +function, the act of creating a new process is sometimes called +@dfn{forking} a process. Each new process (the @dfn{child process} or +@dfn{subprocess}) is allocated a process ID, distinct from the process +ID of the parent process. @xref{Process Identification}. After forking a child process, both the parent and child processes continue to execute normally. If you want your program to wait for a diff --git a/posix/Makefile b/posix/Makefile index cc77e939ad..4016a7758a 100644 --- a/posix/Makefile +++ b/posix/Makefile @@ -37,6 +37,7 @@ headers := \ bits/pthreadtypes-arch.h \ bits/pthreadtypes.h \ bits/sched.h \ + bits/spawn_ext.h \ bits/thread-shared-types.h \ bits/types.h \ bits/types/idtype_t.h \ @@ -591,6 +592,7 @@ tst-spawn-static-ARGS = $(tst-spawn-ARGS) tst-spawn5-ARGS = -- $(host-test-program-cmd) tst-spawn6-ARGS = -- $(host-test-program-cmd) tst-spawn7-ARGS = -- $(host-test-program-cmd) +tst-posix_spawn-setsid-ARGS = -- $(host-test-program-cmd) tst-dir-ARGS = `pwd` `cd $(common-objdir)/$(subdir); pwd` `cd $(common-objdir); pwd` $(objpfx)tst-dir tst-chmod-ARGS = $(objdir) tst-vfork3-ARGS = --test-dir=$(objpfx) diff --git a/posix/spawn.h b/posix/spawn.h index 0a6a070523..2e20991627 100644 --- a/posix/spawn.h +++ b/posix/spawn.h @@ -229,6 +229,8 @@ posix_spawn_file_actions_addtcsetpgrp_np (posix_spawn_file_actions_t *, #endif /* __USE_MISC */ +#include + __END_DECLS #endif /* spawn.h */ diff --git a/posix/spawn_int.h b/posix/spawn_int.h index aeb066c44f..64ee03e62d 100644 --- a/posix/spawn_int.h +++ b/posix/spawn_int.h @@ -76,12 +76,13 @@ struct __spawn_action #define SPAWN_XFLAGS_USE_PATH 0x1 #define SPAWN_XFLAGS_TRY_SHELL 0x2 +#define SPAWN_XFLAGS_RET_PIDFD 0x4 extern int __posix_spawn_file_actions_realloc (posix_spawn_file_actions_t * file_actions) attribute_hidden; -extern int __spawni (pid_t *pid, const char *path, +extern int __spawni (int *pid, const char *path, const posix_spawn_file_actions_t *file_actions, const posix_spawnattr_t *attrp, char *const argv[], char *const envp[], int xflags) attribute_hidden; diff --git a/posix/tst-posix_spawn-setsid.c b/posix/tst-posix_spawn-setsid.c index 124d878ce2..751674165c 100644 --- a/posix/tst-posix_spawn-setsid.c +++ b/posix/tst-posix_spawn-setsid.c @@ -18,78 +18,158 @@ #include #include +#include +#include +#include #include #include #include +#include #include +#include #include #include +#include +#include +#include + +/* Nonzero if the program gets called via `exec'. */ +static int restart; + +/* Hold the four initial argument used to respawn the process, plus + the extra '--direct' and '--restart', and a final NULL. */ +static char *initial_argv[7]; +static int initial_argv_count; + +#define CMDLINE_OPTIONS \ + { "restart", no_argument, &restart, 1 }, + +static char *pidfile; + +static pid_t +read_child_sid (void) +{ + int pidfd = xopen (pidfile, O_RDONLY, 0); + + char buf[INT_STRLEN_BOUND (pid_t)]; + ssize_t n = read (pidfd, buf, sizeof (buf)); + TEST_VERIFY (n < sizeof buf && n >= 0); + buf[n] = '\0'; + + /* We only expect to read the PID. */ + char *endp; + long int rpid = strtol (buf, &endp, 10); + TEST_VERIFY (endp != buf); + + xclose (pidfd); + + return rpid; +} + +/* Called on process re-execution, write down the session id on PIDFILE. */ +_Noreturn static void +handle_restart (const char *pidfile) +{ + int pidfd = xopen (pidfile, O_WRONLY, 0); + + char buf[INT_STRLEN_BOUND (pid_t)]; + int s = snprintf (buf, sizeof buf, "%d", getsid (0)); + size_t n = write (pidfd, buf, s); + TEST_VERIFY (n == s); + + xclose (pidfd); + + exit (EXIT_SUCCESS); +} static void do_test_setsid (bool test_setsid) { - pid_t sid, child_sid; - int res; - /* Current session ID. */ - sid = getsid(0); - if (sid == (pid_t) -1) - FAIL_EXIT1 ("getsid (0): %m"); + pid_t sid = getsid (0); + TEST_VERIFY (sid != (pid_t) -1); posix_spawnattr_t attrp; - /* posix_spawnattr_init should not fail (it basically memset the - attribute). */ - posix_spawnattr_init (&attrp); + TEST_COMPARE (posix_spawnattr_init (&attrp), 0); if (test_setsid) - { - res = posix_spawnattr_setflags (&attrp, POSIX_SPAWN_SETSID); - if (res != 0) - { - errno = res; - FAIL_EXIT1 ("posix_spawnattr_setflags: %m"); - } - } - - /* Program to run. */ - char *args[2] = { (char *) "true", NULL }; - pid_t child; - - res = posix_spawnp (&child, "true", NULL, &attrp, args, environ); - /* posix_spawnattr_destroy is noop. */ - posix_spawnattr_destroy (&attrp); - - if (res != 0) - { - errno = res; - FAIL_EXIT1 ("posix_spawnp: %m"); - } + TEST_COMPARE (posix_spawnattr_setflags (&attrp, POSIX_SPAWN_SETSID), 0); + + /* 1 or 4 elements from initial_argv: + + path to ld.so optional + + --library-path optional + + the library path optional + + application name + + --direct + + --restart + + pidfile */ + int argv_size = initial_argv_count + 2; + char *args[argv_size]; + int argc = 0; + + for (char **arg = initial_argv; *arg != NULL; arg++) + args[argc++] = *arg; + args[argc++] = pidfile; + args[argc] = NULL; + TEST_VERIFY (argc < argv_size); + + PID_T_TYPE pid; + TEST_COMPARE (POSIX_SPAWN (&pid, args[0], NULL, &attrp, args, environ), 0); + TEST_COMPARE (posix_spawnattr_destroy (&attrp), 0); + + siginfo_t sinfo; + TEST_COMPARE (WAITID (P_PID, pid, &sinfo, WEXITED), 0); + TEST_COMPARE (sinfo.si_code, CLD_EXITED); + TEST_COMPARE (sinfo.si_status, 0); + + pid_t child_sid = read_child_sid (); /* Child should have a different session ID than parent. */ - child_sid = getsid (child); - - if (child_sid == (pid_t) -1) - FAIL_EXIT1 ("getsid (%i): %m", child); + TEST_VERIFY (child_sid != (pid_t) -1); if (test_setsid) - { - if (child_sid == sid) - FAIL_EXIT1 ("child session ID matched parent one"); - } + TEST_VERIFY (child_sid != sid); else - { - if (child_sid != sid) - FAIL_EXIT1 ("child session ID did not match parent one"); - } + TEST_VERIFY (child_sid == sid); } static int -do_test (void) +do_test (int argc, char *argv[]) { + /* We must have either: + + - one or four parameters if called initially: + + argv[1]: path for ld.so optional + + argv[2]: "--library-path" optional + + argv[3]: the library path optional + + argv[4]: the application name + + - six parameters left if called through re-execution: + + argv[5/1]: the application name + + argv[6/2]: the pidfile + + * When built with --enable-hardcoded-path-in-tests or issued without + using the loader directly. */ + + if (restart) + handle_restart (argv[1]); + + TEST_VERIFY_EXIT (argc == 2 || argc == 5); + + int i; + for (i = 0; i < argc - 1; i++) + initial_argv[i] = argv[i + 1]; + initial_argv[i++] = (char *) "--direct"; + initial_argv[i++] = (char *) "--restart"; + initial_argv_count = i; + + create_temp_file ("tst-posix_spawn-setsid-", &pidfile); + do_test_setsid (false); do_test_setsid (true); return 0; } +#define TEST_FUNCTION_ARGV do_test #include diff --git a/posix/tst-spawn-chdir.c b/posix/tst-spawn-chdir.c index b335092d7f..c01ca6692d 100644 --- a/posix/tst-spawn-chdir.c +++ b/posix/tst-spawn-chdir.c @@ -29,7 +29,9 @@ #include #include #include +#include #include +#include /* Reads the file at PATH, which must consist of exactly one line. Removes the line terminator at the end of the file. */ @@ -169,17 +171,18 @@ do_test (void) char *const argv[] = { (char *) "pwd", NULL }; char *const envp[] = { NULL } ; - pid_t pid; + PID_T_TYPE pid; if (do_spawnp) - TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions, + TEST_COMPARE (POSIX_SPAWNP (&pid, "pwd", &actions, NULL, argv, envp), 0); else - TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions, + TEST_COMPARE (POSIX_SPAWN (&pid, "subdir/pwd-symlink", &actions, NULL, argv, envp), 0); TEST_VERIFY (pid > 0); - int status; - xwaitpid (pid, &status, 0); - TEST_COMPARE (status, 0); + siginfo_t sinfo; + TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0); + TEST_COMPARE (sinfo.si_code, CLD_EXITED); + TEST_COMPARE (sinfo.si_status, 0); /* Check that the current directory did not change. */ { diff --git a/posix/tst-spawn.c b/posix/tst-spawn.c index 6782a322fc..c44d90756a 100644 --- a/posix/tst-spawn.c +++ b/posix/tst-spawn.c @@ -25,11 +25,13 @@ #include #include #include +#include #include #include #include #include +#include /* Nonzero if the program gets called via `exec'. */ @@ -143,9 +145,9 @@ handle_restart (const char *fd1s, const char *fd2s, const char *fd3s, static int do_test (int argc, char *argv[]) { - pid_t pid; + PID_T_TYPE pid; int fd4; - int status; + siginfo_t sinfo; posix_spawn_file_actions_t actions; char fd1name[18]; char fd2name[18]; @@ -233,17 +235,16 @@ do_test (int argc, char *argv[]) spargv[i++] = fd5name; spargv[i] = NULL; - TEST_COMPARE (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ), + TEST_COMPARE (POSIX_SPAWN (&pid, argv[1], &actions, NULL, spargv, environ), 0); /* Wait for the children. */ - TEST_COMPARE (xwaitpid (pid, &status, 0), pid); - TEST_VERIFY (WIFEXITED (status)); - TEST_VERIFY (!WIFSIGNALED (status)); - TEST_COMPARE (WEXITSTATUS (status), 0); + TEST_COMPARE (WAITID (P_PID, pid, &sinfo, WEXITED), 0); + TEST_COMPARE (sinfo.si_code, CLD_EXITED); + TEST_COMPARE (sinfo.si_status, 0); /* Same test but with a NULL pid argument. */ - TEST_COMPARE (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ), + TEST_COMPARE (POSIX_SPAWN (NULL, argv[1], &actions, NULL, spargv, environ), 0); /* Cleanup. */ @@ -251,10 +252,9 @@ do_test (int argc, char *argv[]) free (name3_copy); /* Wait for the children. */ - xwaitpid (-1, &status, 0); - TEST_VERIFY (WIFEXITED (status)); - TEST_VERIFY (!WIFSIGNALED (status)); - TEST_COMPARE (WEXITSTATUS (status), 0); + TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0); + TEST_COMPARE (sinfo.si_code, CLD_EXITED); + TEST_COMPARE (sinfo.si_status, 0); return 0; } diff --git a/posix/tst-spawn.h b/posix/tst-spawn.h new file mode 100644 index 0000000000..a6f2dc8680 --- /dev/null +++ b/posix/tst-spawn.h @@ -0,0 +1,36 @@ +/* Generic definitions for posix_spawn tests. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef PID_T_TYPE +# define PID_T_TYPE pid_t +#endif + +#ifndef POSIX_SPAWN +# define POSIX_SPAWN(__child, __path, __actions, __attr, __argv, __envp) \ + posix_spawn (__child, __path, __actions, __attr, __argv, __envp) +#endif + +#ifndef POSIX_SPAWNP +# define POSIX_SPAWNP(__child, __path, __actions, __attr, __argv, __envp) \ + posix_spawnp (__child, __path, __actions, __attr, __argv, __envp) +#endif + +#ifndef WAITID +# define WAITID(__idtype, __id, __info, __opts) \ + waitid (__idtype, __id, __info, __opts) +#endif diff --git a/posix/tst-spawn2.c b/posix/tst-spawn2.c index 40dc692488..f5c1f13039 100644 --- a/posix/tst-spawn2.c +++ b/posix/tst-spawn2.c @@ -26,6 +26,7 @@ #include #include +#include int do_test (void) @@ -35,9 +36,9 @@ do_test (void) const char *program = "/path/to/invalid/binary"; char * const args[] = { 0 }; - pid_t pid = -1; + PID_T_TYPE pid = -1; - int ret = posix_spawn (&pid, program, 0, 0, args, environ); + int ret = POSIX_SPAWN (&pid, program, 0, 0, args, environ); if (ret != ENOENT) { errno = ret; @@ -51,14 +52,13 @@ do_test (void) FAIL_EXIT1 ("posix_spawn returned pid != -1 (%i)", (int) pid); /* Check if no child is actually created. */ - ret = waitpid (-1, NULL, 0); - if (ret != -1 || errno != ECHILD) - FAIL_EXIT1 ("waitpid: %m)"); + TEST_COMPARE (WAITID (P_ALL, 0, NULL, WEXITED), -1); + TEST_COMPARE (errno, ECHILD); /* Same as before, but with posix_spawnp. */ char *args2[] = { (char*) program, 0 }; - ret = posix_spawnp (&pid, args2[0], 0, 0, args2, environ); + ret = POSIX_SPAWNP (&pid, args2[0], 0, 0, args2, environ); if (ret != ENOENT) { errno = ret; @@ -68,9 +68,8 @@ do_test (void) if (pid != -1) FAIL_EXIT1 ("posix_spawnp returned pid != -1 (%i)", (int) pid); - ret = waitpid (-1, NULL, 0); - if (ret != -1 || errno != ECHILD) - FAIL_EXIT1 ("waitpid: %m)"); + TEST_COMPARE (WAITID (P_ALL, 0, NULL, WEXITED), -1); + TEST_COMPARE (errno, ECHILD); return 0; } diff --git a/posix/tst-spawn3.c b/posix/tst-spawn3.c index e7ce0fb386..bd21ac6c4b 100644 --- a/posix/tst-spawn3.c +++ b/posix/tst-spawn3.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see . */ +#include #include #include #include @@ -27,9 +28,12 @@ #include #include #include +#include #include #include +#include +#include static int do_test (void) @@ -48,7 +52,6 @@ do_test (void) struct rlimit rl; int max_fd = 24; - int ret; /* Set maximum number of file descriptor to a low value to avoid open too many files in environments where RLIMIT_NOFILE is large and to @@ -66,7 +69,7 @@ do_test (void) /* Exhauste the file descriptor limit with temporary files. */ int files[max_fd]; int nfiles = 0; - for (;;) + for (; nfiles < max_fd; nfiles++) { int fd = create_temp_file ("tst-spawn3.", NULL); if (fd == -1) @@ -75,75 +78,82 @@ do_test (void) FAIL_EXIT1 ("create_temp_file: %m"); break; } - files[nfiles++] = fd; + files[nfiles] = fd; } + assert (nfiles != 0); posix_spawn_file_actions_t a; - if (posix_spawn_file_actions_init (&a) != 0) - FAIL_EXIT1 ("posix_spawn_file_actions_init"); + TEST_COMPARE (posix_spawn_file_actions_init (&a), 0); /* Executes a /bin/sh echo $$ 2>&1 > ${objpfx}tst-spawn3.pid . */ const char pidfile[] = OBJPFX "tst-spawn3.pid"; - if (posix_spawn_file_actions_addopen (&a, STDOUT_FILENO, pidfile, O_WRONLY - | O_CREAT | O_TRUNC, 0644) != 0) - FAIL_EXIT1 ("posix_spawn_file_actions_addopen"); + TEST_COMPARE (posix_spawn_file_actions_addopen (&a, STDOUT_FILENO, pidfile, + O_WRONLY| O_CREAT | O_TRUNC, + 0644), + 0); - if (posix_spawn_file_actions_adddup2 (&a, STDOUT_FILENO, STDERR_FILENO) != 0) - FAIL_EXIT1 ("posix_spawn_file_actions_adddup2"); + TEST_COMPARE (posix_spawn_file_actions_adddup2 (&a, STDOUT_FILENO, + STDERR_FILENO), + 0); /* Since execve (called by posix_spawn) might require to open files to actually execute the shell script, setup to close the temporary file descriptors. */ - for (int i=0; i= 0); - unlink (pidfile); + xunlink (pidfile); /* We only expect to read the PID. */ char *endp; long int rpid = strtol (buf, &endp, 10); - if (*endp != '\n') - FAIL_EXIT1 ("*endp != \'n\'"); - if (endp == buf) - FAIL_EXIT1 ("read empty line"); + TEST_VERIFY (*endp == '\n' && endp != buf); - if (rpid != pid) - FAIL_EXIT1 ("found \"%s\", expected pid %ld\n", buf, (long int) pid); + TEST_COMPARE (rpid, sinfo.si_pid); return 0; } diff --git a/posix/tst-spawn4.c b/posix/tst-spawn4.c index 327f04ea6c..8bf8bd52df 100644 --- a/posix/tst-spawn4.c +++ b/posix/tst-spawn4.c @@ -24,6 +24,7 @@ #include #include #include +#include static int do_test (void) @@ -38,15 +39,15 @@ do_test (void) TEST_VERIFY_EXIT (chmod (scriptname, 0x775) == 0); - pid_t pid; + PID_T_TYPE pid; int status; /* Check if scripts without shebang are correctly not executed. */ - status = posix_spawn (&pid, scriptname, NULL, NULL, (char *[]) { 0 }, + status = POSIX_SPAWN (&pid, scriptname, NULL, NULL, (char *[]) { 0 }, (char *[]) { 0 }); TEST_VERIFY_EXIT (status == ENOEXEC); - status = posix_spawnp (&pid, scriptname, NULL, NULL, (char *[]) { 0 }, + status = POSIX_SPAWNP (&pid, scriptname, NULL, NULL, (char *[]) { 0 }, (char *[]) { 0 }); TEST_VERIFY_EXIT (status == ENOEXEC); diff --git a/posix/tst-spawn5.c b/posix/tst-spawn5.c index 1bd1afabcc..e42f0eb25c 100644 --- a/posix/tst-spawn5.c +++ b/posix/tst-spawn5.c @@ -33,6 +33,7 @@ #include #include +#include /* Nonzero if the program gets called via `exec'. */ static int restart; @@ -161,14 +162,13 @@ spawn_closefrom_test (posix_spawn_file_actions_t *fa, int lowfd, int highfd, args[argc] = NULL; TEST_VERIFY (argc < argv_size); - pid_t pid; - int status; + PID_T_TYPE pid; + siginfo_t sinfo; - TEST_COMPARE (posix_spawn (&pid, args[0], fa, NULL, args, environ), 0); - TEST_COMPARE (xwaitpid (pid, &status, 0), pid); - TEST_VERIFY (WIFEXITED (status)); - TEST_VERIFY (!WIFSIGNALED (status)); - TEST_COMPARE (WEXITSTATUS (status), 0); + TEST_COMPARE (POSIX_SPAWN (&pid, args[0], fa, NULL, args, environ), 0); + TEST_COMPARE (WAITID (P_PID, pid, &sinfo, WEXITED), 0); + TEST_COMPARE (sinfo.si_code, CLD_EXITED); + TEST_COMPARE (sinfo.si_status, 0); } static void diff --git a/posix/tst-spawn6.c b/posix/tst-spawn6.c index 4e29d78168..ff36351cd6 100644 --- a/posix/tst-spawn6.c +++ b/posix/tst-spawn6.c @@ -32,6 +32,7 @@ #include #include #include +#include #ifndef PATH_MAX # define PATH_MAX 1024 @@ -108,17 +109,15 @@ run_subprogram (int argc, char *argv[], const posix_spawnattr_t *attr, spargv[i] = NULL; pid_t pid; - TEST_COMPARE (posix_spawn (&pid, argv[1], actions, attr, spargv, environ), + TEST_COMPARE (POSIX_SPAWN (&pid, argv[1], actions, attr, spargv, environ), exp_err); if (exp_err != 0) return; - int status; - TEST_COMPARE (xwaitpid (pid, &status, WUNTRACED), pid); - TEST_VERIFY (WIFEXITED (status)); - TEST_VERIFY (!WIFSTOPPED (status)); - TEST_VERIFY (!WIFSIGNALED (status)); - TEST_COMPARE (WEXITSTATUS (status), 0); + siginfo_t sinfo; + TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0); + TEST_COMPARE (sinfo.si_code, CLD_EXITED); + TEST_COMPARE (sinfo.si_status, 0); } static int @@ -202,7 +201,7 @@ do_test (int argc, char *argv[]) if (restart) return handle_restart (argv[1], argv[2]); - pid_t pid = xfork (); + PID_T_TYPE pid = xfork (); if (pid == 0) { /* Create a pseudo-terminal to avoid interfering with the one using by diff --git a/posix/tst-spawn7.c b/posix/tst-spawn7.c index fb06915cb7..cc4498830b 100644 --- a/posix/tst-spawn7.c +++ b/posix/tst-spawn7.c @@ -24,7 +24,9 @@ #include #include #include +#include #include +#include /* Nonzero if the program gets called via `exec'. */ #define CMDLINE_OPTIONS \ @@ -81,14 +83,13 @@ spawn_signal_test (const char *type, const posix_spawnattr_t *attr) { spargs[check_type_argc] = (char*) type; - pid_t pid; - int status; + PID_T_TYPE pid; + siginfo_t sinfo; TEST_COMPARE (posix_spawn (&pid, spargs[0], NULL, attr, spargs, environ), 0); - TEST_COMPARE (xwaitpid (pid, &status, 0), pid); - TEST_VERIFY (WIFEXITED (status)); - TEST_VERIFY (!WIFSIGNALED (status)); - TEST_COMPARE (WEXITSTATUS (status), 0); + TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0); + TEST_COMPARE (sinfo.si_code, CLD_EXITED); + TEST_COMPARE (sinfo.si_status, 0); } static void diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index aec7a94785..376e5d622d 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -62,6 +62,7 @@ sysdep_routines += \ clock_adjtime \ clone \ clone-internal \ + clone-pidfd-support \ clone3 \ closefrom_fallback \ convert_scm_timestamps \ @@ -490,12 +491,23 @@ sysdep_headers += \ sysdep_routines += \ getcpu \ oldglob \ + pidfd_spawn \ + pidfd_spawnp \ sched_getcpu \ # sysdep_routines tests += \ tst-affinity \ tst-affinity-pid \ + tst-posix_spawn-setsid-pidfd \ + tst-spawn-chdir-pidfd \ + tst-spawn-pidfd \ + tst-spawn2-pidfd \ + tst-spawn3-pidfd \ + tst-spawn4-pidfd \ + tst-spawn5-pidfd \ + tst-spawn6-pidfd \ + tst-spawn7-pidfd \ # tests tests-static += \ @@ -509,6 +521,14 @@ tests += \ CFLAGS-fork.c = $(libio-mtsafe) CFLAGS-getpid.o = -fomit-frame-pointer CFLAGS-getpid.os = -fomit-frame-pointer + +CFLAGS-tst-spawn3-pidfd.c += -DOBJPFX=\"$(objpfx)\" + +tst-spawn-pidfd-ARGS = -- $(host-test-program-cmd) +tst-spawn5-pidfd-ARGS = -- $(host-test-program-cmd) +tst-spawn6-pidfd-ARGS = -- $(host-test-program-cmd) +tst-spawn7-pidfd-ARGS = -- $(host-test-program-cmd) +tst-posix_spawn-setsid-pidfd-ARGS = -- $(host-test-program-cmd) endif ifeq ($(subdir),inet) diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index bc59bce42f..28825473ae 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -321,6 +321,10 @@ libc { __ppoll64_chk; %endif } + GLIBC_2.38 { + pidfd_spawn; + pidfd_spawnp; + } GLIBC_PRIVATE { # functions used in other libraries __syscall_rt_sigqueueinfo; diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index 0e2d9c3045..bac74ae474 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2665,3 +2665,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index f1bec1978d..dadd302f8d 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -2774,6 +2774,8 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _IO_fprintf F GLIBC_2.4 _IO_printf F GLIBC_2.4 _IO_sprintf F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index aa874b88d0..0f4f07b6bb 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -2426,3 +2426,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist index afbd57da6f..38e5dcb81a 100644 --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist @@ -546,6 +546,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _Exit F GLIBC_2.4 _IO_2_1_stderr_ D 0xa0 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0 diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index e7364cd3fe..423d20cbb5 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -543,6 +543,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _Exit F GLIBC_2.4 _IO_2_1_stderr_ D 0xa0 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0 diff --git a/sysdeps/unix/sysv/linux/bits/spawn_ext.h b/sysdeps/unix/sysv/linux/bits/spawn_ext.h new file mode 100644 index 0000000000..ec56923d88 --- /dev/null +++ b/sysdeps/unix/sysv/linux/bits/spawn_ext.h @@ -0,0 +1,45 @@ +/* POSIX spawn extensions. Linux version. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _SPAWN_H +# error "Never include directly; use instead." +#endif + +__BEGIN_DECLS + +#ifdef __USE_GNU + +extern int pidfd_spawn (int *__restrict __pidfd, + const char *__restrict __file, + const posix_spawn_file_actions_t *__restrict __facts, + const posix_spawnattr_t *__restrict __attrp, + char *const __argv[__restrict_arr], + char *const __envp[__restrict_arr]) + __nonnull ((2, 5)); + +extern int pidfd_spawnp (int *__restrict __pidfd, + const char *__restrict __path, + const posix_spawn_file_actions_t *__restrict __facts, + const posix_spawnattr_t *__restrict __attrp, + char *const __argv[__restrict_arr], + char *const __envp[__restrict_arr]) + __nonnull ((2, 5)); + +#endif /* __USE_GNU */ + +__END_DECLS diff --git a/sysdeps/unix/sysv/linux/clone-pidfd-support.c b/sysdeps/unix/sysv/linux/clone-pidfd-support.c new file mode 100644 index 0000000000..4bf2317c17 --- /dev/null +++ b/sysdeps/unix/sysv/linux/clone-pidfd-support.c @@ -0,0 +1,58 @@ +/* Check if kernel supports PID file descriptors. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include + +/* The PID file descriptors was added during multiple releases: + - Linux 5.2 added CLONE_PIDFD support for clone and __clone_pidfd_supported + syscall. + - Linux 5.3 added support for poll and CLONE_PIDFD for clone3. + - Linux 5.4 added P_PIDFD support on waitid. + + For internal usage on spawn and fork, it only make sense to return a file + descriptor if caller can actually waitid on it. */ +bool +__clone_pidfd_supported (void) +{ + static int supported = 0; + int state = atomic_load_relaxed (&supported); + if (state == 0) + { + /* Linux define the maximum allocated file descriptor value as + 0x7fffffc0 (from fs/file.c): + + #define __const_min(x, y) ((x) < (y) ? (x) : (y)) + unsigned int sysctl_nr_open_max = + __const_min(INT_MAX, ~(size_t)0/sizeof(void *)) & -BITS_PER_LONG; + + So it can detect whther kernel support all pidd support by using + using a valid but never allocated file descriptor: if is not + supported waitid will return EINVAL, otherwise EBADF. + + Also tThe waitid is a cancellation entrypoint, so issue the syscall + directly. */ + int r = INTERNAL_SYSCALL_CALL (waitid, P_PIDFD, INT_MAX, NULL, + WEXITED | WNOHANG, NULL); + state = r == -EBADF ? 1 : -1; + atomic_store_relaxed (&supported, state); + } + + return state == 1; +} diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist index 913fa59215..488418d14e 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2702,3 +2702,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 43af3a9811..75d495e1c7 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -2651,6 +2651,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index af72f8fab0..e53877c52a 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -2835,6 +2835,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist index 48cbb0fa50..5ed2b1ebf4 100644 --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist @@ -2600,6 +2600,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist index c15884bb0b..d050fbf6d0 100644 --- a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist +++ b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist @@ -2186,3 +2186,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index 3738db81df..6465af266c 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -547,6 +547,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _Exit F GLIBC_2.4 _IO_2_1_stderr_ D 0x98 GLIBC_2.4 _IO_2_1_stdin_ D 0x98 diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index ed13627752..00013cc564 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -2778,6 +2778,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index 8357738621..34085d81ab 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2751,3 +2751,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist index 58c5da583d..b26b116f1f 100644 --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist @@ -2748,3 +2748,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index d3741945cd..c86418d156 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -2743,6 +2743,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist index 5319fdc204..3c6f8f4d60 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist @@ -2741,6 +2741,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index 1743ea6eb9..8dfa065638 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -2749,6 +2749,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 9b1f53c6ac..0ca815f2cd 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -2651,6 +2651,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index ae1c6ca1b5..a1e0f772c6 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2790,3 +2790,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/or1k/libc.abilist b/sysdeps/unix/sysv/linux/or1k/libc.abilist index a7c572c947..91cd6075b9 100644 --- a/sysdeps/unix/sysv/linux/or1k/libc.abilist +++ b/sysdeps/unix/sysv/linux/or1k/libc.abilist @@ -2172,3 +2172,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/pidfd_spawn.c b/sysdeps/unix/sysv/linux/pidfd_spawn.c new file mode 100644 index 0000000000..9f4a5780e6 --- /dev/null +++ b/sysdeps/unix/sysv/linux/pidfd_spawn.c @@ -0,0 +1,30 @@ +/* pidfd_spawn - Spawn a process and return a pid file descriptor. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include "spawn_int.h" + +int +pidfd_spawn (int *pidfd, const char *path, + const posix_spawn_file_actions_t *file_actions, + const posix_spawnattr_t *attrp, char *const argv[], + char *const envp[]) +{ + return __spawni (pidfd, path, file_actions, attrp, argv, envp, + SPAWN_XFLAGS_RET_PIDFD); +} diff --git a/sysdeps/unix/sysv/linux/pidfd_spawnp.c b/sysdeps/unix/sysv/linux/pidfd_spawnp.c new file mode 100644 index 0000000000..c8260fcd01 --- /dev/null +++ b/sysdeps/unix/sysv/linux/pidfd_spawnp.c @@ -0,0 +1,30 @@ +/* pidfd_spawnp - Spawn a process and return a pid file descriptor. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include "spawn_int.h" + +int +pidfd_spawnp (int *pidfd, const char *path, + const posix_spawn_file_actions_t *file_actions, + const posix_spawnattr_t *attrp, char *const argv[], + char *const envp[]) +{ + return __spawni (pidfd, path, file_actions, attrp, argv, envp, + SPAWN_XFLAGS_USE_PATH | SPAWN_XFLAGS_RET_PIDFD); +} diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index 074fa031a7..21244ece27 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -2817,6 +2817,8 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _IO_fprintf F GLIBC_2.4 _IO_printf F GLIBC_2.4 _IO_sprintf F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index dfcb4bd2d5..238d00998b 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -2850,6 +2850,8 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _IO_fprintf F GLIBC_2.4 _IO_printf F GLIBC_2.4 _IO_sprintf F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index 63bbccf3f9..36fb9b57ac 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist @@ -2571,6 +2571,8 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _IO_fprintf F GLIBC_2.4 _IO_printf F GLIBC_2.4 _IO_sprintf F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index ab85fd61ef..0c25995661 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2885,3 +2885,5 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index b716f5c763..cda030f623 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -2428,3 +2428,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 774e777b65..bd20c202fb 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2628,3 +2628,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index 8625135c48..a1e9247f72 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -2815,6 +2815,8 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _IO_fprintf F GLIBC_2.4 _IO_printf F GLIBC_2.4 _IO_sprintf F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index d00c7eb262..b80a131bde 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -2608,6 +2608,8 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _IO_fprintf F GLIBC_2.4 _IO_printf F GLIBC_2.4 _IO_sprintf F diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist index b63037241d..496a0185b6 100644 --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist @@ -2658,6 +2658,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index d80055617d..3e0d858d08 100644 --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist @@ -2655,6 +2655,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index 5be55c11d2..84dcda8db2 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -2810,6 +2810,8 @@ GLIBC_2.38 __nldbl___isoc23_vsscanf F GLIBC_2.38 __nldbl___isoc23_vswscanf F GLIBC_2.38 __nldbl___isoc23_vwscanf F GLIBC_2.38 __nldbl___isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 _IO_fprintf F GLIBC_2.4 _IO_printf F GLIBC_2.4 _IO_sprintf F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index 475fdaae15..1688a0a7e9 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -2623,6 +2623,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c index bc321d4c58..2d2aed7e94 100644 --- a/sysdeps/unix/sysv/linux/spawni.c +++ b/sysdeps/unix/sysv/linux/spawni.c @@ -68,6 +68,7 @@ struct posix_spawn_args int xflags; bool use_clone3; int err; + int pidfd; }; /* Older version requires that shell script without shebang definition @@ -309,7 +310,7 @@ fail: /* Spawn a new process executing PATH with the attributes describes in *ATTRP. Before running the process perform the actions described in FILE-ACTIONS. */ static int -__spawnix (pid_t * pid, const char *file, +__spawnix (int *pid, const char *file, const posix_spawn_file_actions_t * file_actions, const posix_spawnattr_t * attrp, char *const argv[], char *const envp[], int xflags, @@ -319,6 +320,15 @@ __spawnix (pid_t * pid, const char *file, struct posix_spawn_args args; int ec; + bool use_pidfd = xflags & SPAWN_XFLAGS_RET_PIDFD; + + /* For CLONE_PIDFD, older kernel might not fail with unsupported flags or + some version might not support waitid (P_PIDFD). So to avoid the need + to handle the error on the helper process, check for full pidfd + support. */ + if (use_pidfd && !__clone_pidfd_supported ()) + return ENOSYS; + /* To avoid imposing hard limits on posix_spawn{p} the total number of arguments is first calculated to allocate a mmap to hold all possible values. */ @@ -368,6 +378,7 @@ __spawnix (pid_t * pid, const char *file, args.argv = argv; args.argc = argc; args.envp = envp; + args.pidfd = 0; args.xflags = xflags; internal_signal_block_all (&args.oldmask); @@ -384,10 +395,13 @@ __spawnix (pid_t * pid, const char *file, { /* Unsupported flags like CLONE_CLEAR_SIGHAND will be cleared up by __clone_internal_fallback. */ - .flags = CLONE_CLEAR_SIGHAND | CLONE_VM | CLONE_VFORK, + .flags = CLONE_CLEAR_SIGHAND | CLONE_VM | CLONE_VFORK + | (use_pidfd ? CLONE_PIDFD : 0), .exit_signal = SIGCHLD, .stack = (uintptr_t) stack, .stack_size = stack_size, + .pidfd = use_pidfd ? (uintptr_t) &args.pidfd : 0, + .parent_tid = use_pidfd ? (uintptr_t) &args.pidfd : 0, }; #ifdef HAVE_CLONE3_WRAPPER args.use_clone3 = true; @@ -429,7 +443,7 @@ __spawnix (pid_t * pid, const char *file, __munmap (stack, stack_size); if ((ec == 0) && (pid != NULL)) - *pid = new_pid; + *pid = use_pidfd ? args.pidfd : new_pid; internal_signal_restore_set (&args.oldmask); diff --git a/sysdeps/unix/sysv/linux/tst-posix_spawn-setsid-pidfd.c b/sysdeps/unix/sysv/linux/tst-posix_spawn-setsid-pidfd.c new file mode 100644 index 0000000000..4372833f07 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-posix_spawn-setsid-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn-chdir-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn-chdir-pidfd.c new file mode 100644 index 0000000000..019527b31b --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn-chdir-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn-pidfd.c new file mode 100644 index 0000000000..c430995af8 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn-pidfd.h b/sysdeps/unix/sysv/linux/tst-spawn-pidfd.h new file mode 100644 index 0000000000..ea51c22447 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn-pidfd.h @@ -0,0 +1,63 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include + +#define PID_T_TYPE int + +/* Call posix_spawn with POSIX_SPAWN_PIDFD set. */ +static inline int +pidfd_spawn_check (int *pidfd, const char *path, + const posix_spawn_file_actions_t *fa, + const posix_spawnattr_t *attr, char *const argv[], + char *const envp[]) +{ + int r = pidfd_spawn (pidfd, path, fa, attr, argv, envp); + if (r == ENOSYS) + FAIL_UNSUPPORTED ("kernel does not support CLONE_PIDFD clone flag"); + return r; +} + +#define POSIX_SPAWN(__pidfd, __path, __actions, __attr, __argv, __envp) \ + pidfd_spawn_check (__pidfd, __path, __actions, __attr, __argv, __envp) + +static inline int +pidfd_spawnp_check (int *pidfd, const char *file, + const posix_spawn_file_actions_t *fa, + const posix_spawnattr_t *attr, + char *const argv[], char *const envp[]) +{ + int r = pidfd_spawnp (pidfd, file, fa, attr, argv, envp); + if (r == ENOSYS) + FAIL_UNSUPPORTED ("kernel does not support CLONE_PIDFD clone flag"); + return r; +} + +#define POSIX_SPAWNP(__child, __path, __actions, __attr, __argv, __envp) \ + pidfd_spawnp_check (__child, __path, __actions, __attr, __argv, __envp) + +#define WAITID(__idtype, __id, __info, __opts) \ + ({ \ + __typeof (__idtype) __new_idtype = __idtype == P_PID \ + ? P_PIDFD : __idtype; \ + waitid (__new_idtype, __id, __info, __opts); \ + }) + +#define TST_SPAWN_PIDFD 1 diff --git a/sysdeps/unix/sysv/linux/tst-spawn2-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn2-pidfd.c new file mode 100644 index 0000000000..03ba7a3d15 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn2-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn3-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn3-pidfd.c new file mode 100644 index 0000000000..8ad9a16854 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn3-pidfd.c @@ -0,0 +1,20 @@ +/* Check posix_spawn add file actions. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn4-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn4-pidfd.c new file mode 100644 index 0000000000..83922da7d1 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn4-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn5-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn5-pidfd.c new file mode 100644 index 0000000000..149c352bf8 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn5-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn6-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn6-pidfd.c new file mode 100644 index 0000000000..d3f5859457 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn6-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/tst-spawn7-pidfd.c b/sysdeps/unix/sysv/linux/tst-spawn7-pidfd.c new file mode 100644 index 0000000000..3aec86bec2 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-spawn7-pidfd.c @@ -0,0 +1,20 @@ +/* Tests for spawn pidfd extension. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index 6cfb928bc8..b7422d5747 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -2574,6 +2574,8 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F GLIBC_2.4 __confstr_chk F GLIBC_2.4 __fgets_chk F GLIBC_2.4 __fgets_unlocked_chk F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index c735097172..90680bc1d7 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2680,3 +2680,5 @@ GLIBC_2.38 __isoc23_wcstoull F GLIBC_2.38 __isoc23_wcstoull_l F GLIBC_2.38 __isoc23_wcstoumax F GLIBC_2.38 __isoc23_wscanf F +GLIBC_2.38 pidfd_spawn F +GLIBC_2.38 pidfd_spawnp F