[PATCH 2/2] posix: Correctly block/unblock all signals on Linux posix_spawn

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

This patch correctly block and unblocks all signals when executing
Linux posix_spawn by using the __libc_signal_{un}block_all functions
instead of default sigprocmask.  The latter might remove both
SIGCANCEL and SIGSETXID from the blocked signal list.

Checked on x86_64, i686, powerpc64le, and aarch64.

	* sysdeps/unix/sysv/linux/spawni.c (__spawnix): Correctly block and unblock
	all signals when executing the clone vfork child.
	(SIGALL_SET): Remove macro.
---
 ChangeLog                        | 4 ++++
 sysdeps/unix/sysv/linux/spawni.c | 8 ++------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c
index f7cb96f..c34f8fd 100644
--- a/sysdeps/unix/sysv/linux/spawni.c
+++ b/sysdeps/unix/sysv/linux/spawni.c
@@ -60,10 +60,6 @@
    normal program exit with the exit code 127.  */
 #define SPAWN_ERROR	127
 
-/* We need to block both SIGCANCEL and SIGSETXID.  */
-#define SIGALL_SET \
-  ((__sigset_t) { .__val = {[0 ...  _SIGSET_NWORDS-1 ] =  -1 } })
-
 #ifdef __ia64__
 # define CLONE(__fn, __stack, __stacksize, __flags, __args) \
   __clone2 (__fn, __stack, __stacksize, __flags, __args, 0, 0, 0)
@@ -331,7 +327,7 @@ __spawnix (pid_t * pid, const char *file,
   args.xflags = xflags;
   args.err = 0;
 
-  __sigprocmask (SIG_BLOCK, &SIGALL_SET, &args.oldmask);
+  __libc_signal_block_all (&args.oldmask);
 
   /* The clone flags used will create a new child that will run in the same
      memory space (CLONE_VM) and the execution of calling thread will be
@@ -357,7 +353,7 @@ __spawnix (pid_t * pid, const char *file,
   if ((ec == 0) && (pid != NULL))
     *pid = new_pid;
 
-  __sigprocmask (SIG_SETMASK, &args.oldmask, 0);
+  __libc_signal_restore_set (&args.oldmask);
 
   __libc_ptf_call (__pthread_setcancelstate, (state, NULL), 0);
 
-- 
2.7.4