Patchwork [06/15] Consolidate Linux semctl implementation

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Submitter Adhemerval Zanella Netto
Date Nov. 1, 2016, 2:25 p.m.
Message ID <1478010323-13076-7-git-send-email-adhemerval.zanella@linaro.org>
Download mbox | patch
Permalink /patch/17069/
State New
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Comments

Adhemerval Zanella Netto - Nov. 1, 2016, 2:25 p.m.
This patch consolidates the semctl Linux implementation in only
one default file, sysdeps/unix/sysv/linux/semctl.c.  If tries to use
the direct syscall if it is defined, otherwise will use the old ipc
multiplex mechanism.

The patch also simplify header inclusion and reorganize internal
compat symbol to be built only if old ipc is defined.

Checked on x86_64, i686, powerpc64le, aarch64, and armhf.

	* sysdeps/unix/sysv/linux/alpha/semctl.c: Remove file.
	* sysdeps/unix/sysv/linux/arm/semctl.c: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/semctl.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/semctl.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/semctl.c: Use defaulf
	implementation.
	* sysdeps/unix/sysv/linux/semctl.c (__new_semctl): Use semctl
	syscall if it is defined.
---
 ChangeLog                                      |  9 +++++
 sysdeps/unix/sysv/linux/alpha/semctl.c         |  1 -
 sysdeps/unix/sysv/linux/arm/semctl.c           | 54 --------------------------
 sysdeps/unix/sysv/linux/microblaze/semctl.c    |  1 -
 sysdeps/unix/sysv/linux/mips/mips64/semctl.c   | 38 +-----------------
 sysdeps/unix/sysv/linux/semctl.c               | 54 +++++++++++++-------------
 sysdeps/unix/sysv/linux/sparc/sparc64/semctl.c | 54 --------------------------
 7 files changed, 37 insertions(+), 174 deletions(-)
 delete mode 100644 sysdeps/unix/sysv/linux/alpha/semctl.c
 delete mode 100644 sysdeps/unix/sysv/linux/arm/semctl.c
 delete mode 100644 sysdeps/unix/sysv/linux/microblaze/semctl.c
 delete mode 100644 sysdeps/unix/sysv/linux/sparc/sparc64/semctl.c

Patch

diff --git a/sysdeps/unix/sysv/linux/alpha/semctl.c b/sysdeps/unix/sysv/linux/alpha/semctl.c
deleted file mode 100644
index 4cb834a..0000000
--- a/sysdeps/unix/sysv/linux/alpha/semctl.c
+++ /dev/null
@@ -1 +0,0 @@ 
-#include <sysdeps/unix/sysv/linux/arm/semctl.c>
diff --git a/sysdeps/unix/sysv/linux/arm/semctl.c b/sysdeps/unix/sysv/linux/arm/semctl.c
deleted file mode 100644
index 79d9d3e..0000000
--- a/sysdeps/unix/sysv/linux/arm/semctl.c
+++ /dev/null
@@ -1,54 +0,0 @@ 
-/* Copyright (C) 1995-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
-
-   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
-   <http://www.gnu.org/licenses/>.  */
-
-#include <errno.h>
-#include <stdarg.h>
-#include <sys/sem.h>
-#include <ipc_priv.h>
-#include <sysdep.h>
-#include <sys/syscall.h>
-
-
-/* Define a `union semun' suitable for Linux here.  */
-union semun
-{
-  int val;			/* value for SETVAL */
-  struct semid_ds *buf;		/* buffer for IPC_STAT & IPC_SET */
-  unsigned short int *array;	/* array for GETALL & SETALL */
-  struct seminfo *__buf;	/* buffer for IPC_INFO */
-};
-
-int
-__new_semctl (int semid, int semnum, int cmd, ...)
-{
-  union semun arg;
-  va_list ap;
-
-  va_start (ap, cmd);
-
-  /* Get the argument.  */
-  arg = va_arg (ap, union semun);
-
-  va_end (ap);
-
-  return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64,
-			 arg.array);
-}
-
-#include <shlib-compat.h>
-versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2);
diff --git a/sysdeps/unix/sysv/linux/microblaze/semctl.c b/sysdeps/unix/sysv/linux/microblaze/semctl.c
deleted file mode 100644
index 4cb834a..0000000
--- a/sysdeps/unix/sysv/linux/microblaze/semctl.c
+++ /dev/null
@@ -1 +0,0 @@ 
-#include <sysdeps/unix/sysv/linux/arm/semctl.c>
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/semctl.c b/sysdeps/unix/sysv/linux/mips/mips64/semctl.c
index 1115a25..61ba985 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/semctl.c
+++ b/sysdeps/unix/sysv/linux/mips/mips64/semctl.c
@@ -15,39 +15,5 @@ 
    License along with the GNU C Library.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <stdarg.h>
-#include <sys/sem.h>
-#include <ipc_priv.h>
-#include <sysdep.h>
-
-/* Define a `union semun' suitable for Linux here.  */
-union semun
-{
-  int val;			/* value for SETVAL */
-  struct semid_ds *buf;		/* buffer for IPC_STAT & IPC_SET */
-  unsigned short int *array;	/* array for GETALL & SETALL */
-  struct seminfo *__buf;	/* buffer for IPC_INFO */
-};
-
-int __semctl (int semid, int semnum, int cmd, ...);
-
-int
-__semctl (int semid, int semnum, int cmd, ...)
-{
-  union semun arg;
-  va_list ap;
-
-  va_start (ap, cmd);
-
-  /* Get the argument.  */
-  arg = va_arg (ap, union semun);
-
-  va_end (ap);
-
-  return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64,
-			 arg.array);
-}
-
-#include <shlib-compat.h>
-versioned_symbol (libc, __semctl, semctl, GLIBC_2_0);
+#define DEFAULT_VERSION GLIBC_2_0
+#include <sysdeps/unix/sysv/linux/semctl.c>
diff --git a/sysdeps/unix/sysv/linux/semctl.c b/sysdeps/unix/sysv/linux/semctl.c
index ee84a1e..c170681 100644
--- a/sysdeps/unix/sysv/linux/semctl.c
+++ b/sysdeps/unix/sysv/linux/semctl.c
@@ -16,18 +16,14 @@ 
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <stdarg.h>
 #include <sys/sem.h>
+#include <stdarg.h>
 #include <ipc_priv.h>
-
 #include <sysdep.h>
-#include <string.h>
-#include <sys/syscall.h>
 #include <shlib-compat.h>
+#include <errno.h>
 
-#include <kernel-features.h>
-
+/* Old semid_ds definition.  */
 struct __old_semid_ds
 {
   struct __old_ipc_perm sem_perm;	/* operation permission struct */
@@ -50,23 +46,17 @@  union semun
   struct __old_semid_ds *__old_buf;
 };
 
-/* Return identifier for array of NSEMS semaphores associated with
-   KEY.  */
-#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
-int __old_semctl (int semid, int semnum, int cmd, ...);
+#ifndef DEFAULT_VERSION
+# define DEFAULT_VERSION GLIBC_2_2
 #endif
-int __new_semctl (int semid, int semnum, int cmd, ...);
 
-#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
 int
-attribute_compat_text_section
-__old_semctl (int semid, int semnum, int cmd, ...)
+__new_semctl (int semid, int semnum, int cmd, ...)
 {
-  union semun arg;
+  union semun arg = { 0 };
   va_list ap;
 
   /* Get the argument only if required.  */
-  arg.buf = NULL;
   switch (cmd)
     {
     case SETVAL:        /* arg.val */
@@ -83,20 +73,28 @@  __old_semctl (int semid, int semnum, int cmd, ...)
       break;
     }
 
-  return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
-			 &arg);
-}
-compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0);
+#ifdef __NR_semctl
+  return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd, arg.array);
+#else
+  return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
+			      &arg);
 #endif
+}
+versioned_symbol (libc, __new_semctl, semctl, DEFAULT_VERSION);
+
+
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) \
+    && defined (__NR_ipc)
+int __old_semctl (int semid, int semnum, int cmd, ...);
 
 int
-__new_semctl (int semid, int semnum, int cmd, ...)
+attribute_compat_text_section
+__old_semctl (int semid, int semnum, int cmd, ...)
 {
-  union semun arg;
+  union semun arg = { 0 };
   va_list ap;
 
   /* Get the argument only if required.  */
-  arg.buf = NULL;
   switch (cmd)
     {
     case SETVAL:        /* arg.val */
@@ -113,8 +111,8 @@  __new_semctl (int semid, int semnum, int cmd, ...)
       break;
     }
 
-  return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64,
-			 &arg);
+  return INLINE_SYSCALL_CALL (ipc, IPCOP_semctl, semid, semnum, cmd,
+			      &arg);
 }
-
-versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2);
+compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0);
+#endif
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/semctl.c b/sysdeps/unix/sysv/linux/sparc/sparc64/semctl.c
deleted file mode 100644
index a9ae4c6..0000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/semctl.c
+++ /dev/null
@@ -1,54 +0,0 @@ 
-/* Copyright (C) 1995-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
-
-   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
-   <http://www.gnu.org/licenses/>.  */
-
-#include <errno.h>
-#include <stdarg.h>
-#include <sys/sem.h>
-#include <ipc_priv.h>
-
-#include <sysdep.h>
-#include <sys/syscall.h>
-
-/* Define a `union semun' suitable for Linux here.  */
-union semun
-{
-  int val;			/* value for SETVAL */
-  struct semid_ds *buf;		/* buffer for IPC_STAT & IPC_SET */
-  unsigned short int *array;	/* array for GETALL & SETALL */
-  struct seminfo *__buf;	/* buffer for IPC_INFO */
-};
-
-/* Return identifier for array of NSEMS semaphores associated with
-   KEY.  */
-
-int
-semctl (int semid, int semnum, int cmd, ...)
-{
-  union semun arg;
-  va_list ap;
-
-  va_start (ap, cmd);
-
-  /* Get the argument.  */
-  arg = va_arg (ap, union semun);
-
-  va_end (ap);
-
-  return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
-			 arg.array);
-}