* sysdeps/posix/spawni.c (__spawni): Use local_seteuid and

	local_setegid instead of seteuid and setegid.
	* sysdeps/generic/local-setxid.h: New file.
	* sysdeps/unix/sysv/linux/local-setxid.h: New file.

ChangeLog

@@ -1,5 +1,10 @@
 2006-06-04  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/posix/spawni.c (__spawni): Use local_seteuid and
+	local_setegid instead of seteuid and setegid.
+	* sysdeps/generic/local-setxid.h: New file.
+	* sysdeps/unix/sysv/linux/local-setxid.h: New file.
+
 	* sysdeps/posix/spawni.c (__spawni): Use non-cancelable interfaces.
 
 	* string/Makefile (tests): Add bug-envz1.

sysdeps/generic/local-setxid.h

@@ -0,0 +1,4 @@
+/* No special support.  Fall back to the regular functions.  */
+
+#define local_seteuid(id) seteuid (id)
+#define local_setegid(id) setegid (id)

sysdeps/posix/spawni.c

@@ -26,6 +26,7 @@
 #include <unistd.h>
 #include "spawn_int.h"
 #include <not-cancel.h>
+#include <local-setxid.h>
 
 
 /* The Unix standard contains a long explanation of the way to signal
@@ -155,7 +156,8 @@ __spawni (pid_t *pid, const char *file,
 
   /* Set the effective user and group IDs.  */
   if ((flags & POSIX_SPAWN_RESETIDS) != 0
-      && (seteuid (__getuid ()) != 0 || setegid (__getgid ()) != 0))
+      && (local_seteuid (__getuid ()) != 0
+	  || local_setegid (__getgid ()) != 0))
     _exit (SPAWN_ERROR);
 
   /* Execute the file actions.  */

sysdeps/unix/sysv/linux/local-setxid.h

@@ -0,0 +1,23 @@
+/* SETxID functions which only have to change the local thread and
+   none of the possible other threads.  */
+#include <kernel-features.h>
+#include <sysdep.h>
+
+/* If we can use the syscall directly, use it.  */
+#if __ASSUME_32BITUIDS > 0 && defined __NR_setresuid32
+# define local_seteuid(id) INLINE_SYSCALL (setresuid32, 3, -1, id, -1)
+#elif __ASSUME_SETRESUID_SYSCALL > 0
+# define local_seteuid(id) INLINE_SYSCALL (setresuid, 3, -1, id, -1)
+#else
+# define local_seteuid(id) seteuid (id)
+#endif
+
+
+/* If we can use the syscall directly, use it.  */
+#if __ASSUME_32BITUIDS > 0 && defined __NR_setresgid32
+# define local_setegid(id) INLINE_SYSCALL (setresgid32, 3, -1, id, -1)
+#elif __ASSUME_SETRESGID_SYSCALL > 0
+# define local_setegid(id) INLINE_SYSCALL (setresgid, 3, -1, id, -1)
+#else
+# define local_setegid(id) setegid (id)
+#endif