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[PATCH v2 14/16] Use shmdt syscall for linux implementation
- From: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
- To: libc-alpha at sourceware dot org
- Date: Wed, 2 Nov 2016 17:26:51 -0200
- Subject: [PATCH v2 14/16] Use shmdt syscall for linux implementation
- Authentication-results: sourceware.org; auth=none
- References: <1478114813-3526-1-git-send-email-adhemerval.zanella@linaro.org>
Changes from previous version:
- Use __ASSUME_SYSVIPC_SYSCALL instead of __NR_syscall to issue the
wired syscall or the ipc one.
--
this patch add a direct call to shmdt syscall if it is supported by
kernel features.
hecked on x86_64, i686, powerpc64le, aarch64, and armhf.
* sysdeps/unix/sysv/linux/shmdt.c (shmdt): Use shmdt syscall if it is
defined.
---
ChangeLog | 3 +++
sysdeps/unix/sysv/linux/shmdt.c | 12 +++++++-----
2 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/shmdt.c b/sysdeps/unix/sysv/linux/shmdt.c
index 7224d6f..2f5b316 100644
--- a/sysdeps/unix/sysv/linux/shmdt.c
+++ b/sysdeps/unix/sysv/linux/shmdt.c
@@ -16,12 +16,10 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <errno.h>
-#include <sys/shm.h>
+#include <sys/msg.h>
#include <ipc_priv.h>
-
#include <sysdep.h>
-#include <sys/syscall.h>
+#include <errno.h>
/* Detach shared memory segment starting at address specified by SHMADDR
from the caller's data segment. */
@@ -29,5 +27,9 @@
int
shmdt (const void *shmaddr)
{
- return INLINE_SYSCALL (ipc, 5, IPCOP_shmdt, 0, 0, 0, (void *) shmaddr);
+#ifdef __ASSUME_SYSVIPC_SYSCALL
+ return INLINE_SYSCALL_CALL (shmdt, 0, 0, 0, shmaddr);
+#else
+ return INLINE_SYSCALL_CALL (ipc, IPCOP_shmdt, 0, 0, 0, shmaddr);
+#endif
}
--
2.7.4