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[PATCH v2 12/16] Use shmat syscall for Linux implementation

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 shmat syscall if it is supported by
kernel features.

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

	* sysdeps/unix/sysv/linux/shmat.c (shmat): Use shmat syscall if it is
 ChangeLog                       |  3 +++
 sysdeps/unix/sysv/linux/shmat.c | 17 ++++++++---------
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/shmat.c b/sysdeps/unix/sysv/linux/shmat.c
index 5afc93c..97a15c2 100644
--- a/sysdeps/unix/sysv/linux/shmat.c
+++ b/sysdeps/unix/sysv/linux/shmat.c
@@ -16,13 +16,10 @@
    License along with the GNU C Library; if not, see
    <>.  */
-#include <errno.h>
-#include <sys/shm.h>
+#include <sys/msg.h>
 #include <ipc_priv.h>
 #include <sysdep.h>
-#include <unistd.h>
-#include <sys/syscall.h>
+#include <errno.h>
 /* Attach the shared memory segment associated with SHMID to the data
    segment of the calling process.  SHMADDR and SHMFLG determine how
@@ -31,17 +28,19 @@
 void *
 shmat (int shmid, const void *shmaddr, int shmflg)
+  return INLINE_SYSCALL_CALL (shmat, shmid, shmaddr, shmflg);
   unsigned long resultvar;
   void *raddr;
-  resultvar = INTERNAL_SYSCALL (ipc, err, 5, IPCOP_shmat,
-				shmid, shmflg,
-				(long int) &raddr,
-				(void *) shmaddr);
+  resultvar = INTERNAL_SYSCALL_CALL (ipc, err, IPCOP_shmat, shmid, shmflg,
+				     &raddr, shmaddr);
   if (INTERNAL_SYSCALL_ERROR_P (resultvar, err))
   return raddr;

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