From patchwork Thu Jun 17 11:50:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 43864 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 C4AB83894429 for ; Thu, 17 Jun 2021 11:55:06 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C4AB83894429 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1623930906; bh=IY/eSK2jBnjs4KtMf2C3DPx3Q/TGZauuULn29pOerJw=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=vovMuol/fIyinMKK9A82MGJvGGopWsCT+tcGRRBg1ek+++OKyJ75k8rkPGv6Y9M32 ncDelqa9uzFvemxj4i4nfPZF3g5S4y5tPZljhG5ZRkzQniS3Z/4PgEPEZgwRRUw8c6 TS6hnjWNRi0bb+/pNDkwsKO9LnLV+j2Yq9JlARGU= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x72f.google.com (mail-qk1-x72f.google.com [IPv6:2607:f8b0:4864:20::72f]) by sourceware.org (Postfix) with ESMTPS id 6BF4C3894411 for ; Thu, 17 Jun 2021 11:51:15 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 6BF4C3894411 Received: by mail-qk1-x72f.google.com with SMTP id g4so1528288qkl.1 for ; Thu, 17 Jun 2021 04:51:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IY/eSK2jBnjs4KtMf2C3DPx3Q/TGZauuULn29pOerJw=; b=Hy+xCeCrW11JI84yVBQnRAUmFRlZEw59Y4neod/g5N7rTUHc70dWqjLnohTiPzMSK6 VqcrbsJxyTb3zp9LtEIcqEy84nVh2q+dXesYfXVtUqd8I6FLn8Oume1g+udyYalD4tCD R4QttBgZDcQ0KukG6BAZjQVErMM47wiXAbohFL4/B5biWkOtl/4nJ/X4JyvwdCtUvnWE ety0bLR2AV1DLfPa6JTFn1wYpf1GD9LJfwSMe9oFNHEzd6/RTsSkfLBGs79ludzQ89dk UtVdGlLnFtQ/f0XFOhRvGMeuWkQqr5lY+POc7XWK+Uz1ceiBBp8f9qDNwzJUyzS3sj22 DZYA== X-Gm-Message-State: AOAM532PtxHeyAIr+bNXSuKuKnY62ZYNxUMVmFFxqm+Zral02NcnxAtJ J42KfDzihvfooAQAPvvicrUh+aSTFRdDYg== X-Google-Smtp-Source: ABdhPJze6eRtNR3HiY9ZiQt5hwzpyPKYtze0sK4mQZttgNKBtaaqxdnmEkGyi8E4v7+7g7MFF3thZA== X-Received: by 2002:ae9:e512:: with SMTP id w18mr3329072qkf.281.1623930674893; Thu, 17 Jun 2021 04:51:14 -0700 (PDT) Received: from birita.. ([177.194.59.218]) by smtp.googlemail.com with ESMTPSA id p12sm3016435qtw.61.2021.06.17.04.51.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Jun 2021 04:51:14 -0700 (PDT) To: libc-alpha@sourceware.org, Lukasz Majewski , Carlos O'Donell Subject: [PATCH 03/18] support: Add support_create_timer Date: Thu, 17 Jun 2021 08:50:49 -0300 Message-Id: <20210617115104.1359598-4-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210617115104.1359598-1-adhemerval.zanella@linaro.org> References: <20210617115104.1359598-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.3 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 autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) 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 Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" It is a simple wrapper over timer_create, timer_settime, and sigaction. It will be used to check for large timeout to trigger an EINTR. Reviewed-by: Lukasz Majewski --- support/Makefile | 1 + support/support.h | 11 ++++++ support/support_create_timer.c | 69 ++++++++++++++++++++++++++++++++++ 3 files changed, 81 insertions(+) create mode 100644 support/support_create_timer.c diff --git a/support/Makefile b/support/Makefile index f3ebaa8d2e..278f4627d8 100644 --- a/support/Makefile +++ b/support/Makefile @@ -50,6 +50,7 @@ libsupport-routines = \ support_chroot \ support_copy_file \ support_copy_file_range \ + support_create_timer \ support_descriptor_supports_holes \ support_descriptors \ support_enter_mount_namespace \ diff --git a/support/support.h b/support/support.h index 874204b7fc..9ec8ecb8d7 100644 --- a/support/support.h +++ b/support/support.h @@ -24,6 +24,7 @@ #define SUPPORT_H #include +#include #include #include /* For mode_t. */ @@ -153,6 +154,16 @@ extern bool support_select_modifies_timeout (void); tv_usec larger than 1000000. */ extern bool support_select_normalizes_timeout (void); +/* Create a timer that trigger after SEC seconds and NSEC nanoseconds. If + REPEAT is true the timer will repeat indefinitely. If CALLBACK is not + NULL, the function will be called when the timer expires; otherwise a + dummy empty function is used instead. + This is implemented with POSIX per-process timer with SIGEV_SIGNAL. */ +timer_t support_create_timer (uint64_t sec, long int nsec, bool repeat, + void (*callback)(int)); +/* Disable the timer TIMER. */ +void support_delete_timer (timer_t timer); + __END_DECLS #endif /* SUPPORT_H */ diff --git a/support/support_create_timer.c b/support/support_create_timer.c new file mode 100644 index 0000000000..c93aaa5c6b --- /dev/null +++ b/support/support_create_timer.c @@ -0,0 +1,69 @@ +/* Create a periodic timer. + Copyright (C) 2021 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 +#include + +static void +dummy_alrm_handler (int sig) +{ +} + +timer_t +support_create_timer (uint64_t sec, long int nsec, bool repeat, + void (*callback)(int)) +{ + struct sigaction sa; + sa.sa_handler = callback != NULL ? callback : dummy_alrm_handler; + sigemptyset (&sa.sa_mask); + sa.sa_flags = 0; + xsigaction (SIGALRM, &sa, NULL); + + struct sigevent ev = { + .sigev_notify = SIGEV_SIGNAL, + .sigev_signo = SIGALRM + }; + timer_t timerid; + int r = timer_create (CLOCK_REALTIME, &ev, &timerid); + if (r == -1) + FAIL_EXIT1 ("timer_create: %m"); + + /* Single timer with 0.1s. */ + struct itimerspec its = + { + { .tv_sec = repeat ? sec : 0, .tv_nsec = repeat ? nsec : 0 }, + { .tv_sec = sec, .tv_nsec = nsec } + }; + r = timer_settime (timerid, 0, &its, NULL); + if (r == -1) + FAIL_EXIT1 ("timer_settime: %m"); + + return timerid; +} + +/* Disable the timer TIMER. */ +void +support_delete_timer (timer_t timer) +{ + int r = timer_delete (timer); + if (r == -1) + FAIL_EXIT1 ("timer_delete: %m"); + xsignal (SIGALRM, SIG_DFL); +}