linux: Consolidate dl-origin.c

Use the generic implementation as the default, since the syscall
is supported by all architectures.

Also cleanup some headers and remove the INTERNAL_SYSCALL_ERROR_P
usage (the INTERNAL_SYSCALL_CALL macro already returns an negative
value if an error occurs).

1 files changed, 5 insertions, 9 deletions

diff --git a/sysdeps/unix/sysv/linux/dl-origin.c b/sysdeps/unix/sysv/linux/dl-origin.c
index 9a76c78648..2fd1e5f400 100644
--- a/sysdeps/unix/sysv/linux/dl-origin.c
+++ b/sysdeps/unix/sysv/linux/dl-origin.c
@@ -17,15 +17,11 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/param.h>
+#include <dl-dst.h>
+#include <fcntl.h>
 #include <ldsodefs.h>
 #include <sysdep.h>
 
-#include <dl-dst.h>
-
 /* On Linux >= 2.1 systems which have the dcache implementation we can get
    the path of the application from the /proc/self/exe symlink.  Try this
    first and fall back on the generic method if necessary.  */
@@ -37,9 +33,9 @@ _dl_get_origin (void)
   char *result;
   int len;
 
-  len = INTERNAL_SYSCALL_CALL (readlink, "/proc/self/exe", linkval,
-			       sizeof (linkval));
-  if (! INTERNAL_SYSCALL_ERROR_P (len) && len > 0 && linkval[0] != '[')
+  len = INTERNAL_SYSCALL_CALL (readlinkat, AT_FDCWD, "/proc/self/exe",
+			       linkval, sizeof (linkval));
+  if (len > 0 && linkval[0] != '[')
     {
       /* We can use this value.  */
       assert (linkval[0] == '/');