Silence most -Wzero-as-null-pointer-constant diagnostics

Replace 0 by NULL and {0} by {}.

Omit a few cases that aren't so trivial to fix.

Link: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117059>
Link: <https://software.codidact.com/posts/292718/292759#answer-292759>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

8 files changed, 13 insertions, 13 deletions

diff --git a/sysdeps/unix/sysv/linux/brk.c b/sysdeps/unix/sysv/linux/brk.c
index a0be43e..dbdb8dd 100644
--- a/sysdeps/unix/sysv/linux/brk.c
+++ b/sysdeps/unix/sysv/linux/brk.c
@@ -22,7 +22,7 @@
 #include <brk_call.h>
 
 /* This must be initialized data because commons can't have aliases.  */
-void *__curbrk = 0;
+void *__curbrk = NULL;
 
 #if HAVE_INTERNAL_BRK_ADDR_SYMBOL
 /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
diff --git a/sysdeps/unix/sysv/linux/dl-early_allocate.c b/sysdeps/unix/sysv/linux/dl-early_allocate.c
index 4d98076..ce5c6b5 100644
--- a/sysdeps/unix/sysv/linux/dl-early_allocate.c
+++ b/sysdeps/unix/sysv/linux/dl-early_allocate.c
@@ -51,7 +51,7 @@ _dl_early_allocate (size_t size)
     {
       /* If brk has not been invoked, there is no need to update
          __curbrk.  The first call to brk will take care of that.  */
-      void *previous = __brk_call (0);
+      void *previous = __brk_call (NULL);
       result = __brk_call (previous + size);
       if (result == previous)
         result = NULL;
diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.c b/sysdeps/unix/sysv/linux/dl-sysdep.c
index 4352549..d1170a1 100644
--- a/sysdeps/unix/sysv/linux/dl-sysdep.c
+++ b/sysdeps/unix/sysv/linux/dl-sysdep.c
@@ -113,7 +113,7 @@ _dl_sysdep_start (void **start_argptr,
   /* Initialize DSO sorting algorithm after tunables.  */
   _dl_sort_maps_init ();
 
-  __brk (0);			/* Initialize the break.  */
+  __brk (NULL);			/* Initialize the break.  */
 
 #ifdef DL_PLATFORM_INIT
   DL_PLATFORM_INIT;
diff --git a/sysdeps/unix/sysv/linux/gettimeofday.c b/sysdeps/unix/sysv/linux/gettimeofday.c
index 5ca8916..3c97da0 100644
--- a/sysdeps/unix/sysv/linux/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/gettimeofday.c
@@ -31,7 +31,7 @@
 static int
 __gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
 {
-  if (__glibc_unlikely (tz != 0))
+  if (__glibc_unlikely (tz != NULL))
     memset (tz, 0, sizeof *tz);
   return INLINE_SYSCALL_CALL (gettimeofday, tv, tz);
 }
@@ -47,7 +47,7 @@ libc_ifunc (__gettimeofday,
 int
 __gettimeofday (struct timeval *restrict tv, void *restrict tz)
 {
-  if (__glibc_unlikely (tz != 0))
+  if (__glibc_unlikely (tz != NULL))
     memset (tz, 0, sizeof *tz);
 
   return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
diff --git a/sysdeps/unix/sysv/linux/settimeofday.c b/sysdeps/unix/sysv/linux/settimeofday.c
index 4235dc8..4fa1d66 100644
--- a/sysdeps/unix/sysv/linux/settimeofday.c
+++ b/sysdeps/unix/sysv/linux/settimeofday.c
@@ -26,9 +26,9 @@ int
 __settimeofday64 (const struct __timeval64 *tv, const struct timezone *tz)
 {
   /* Backwards compatibility for setting the UTC offset.  */
-  if (__glibc_unlikely (tz != 0))
+  if (__glibc_unlikely (tz != NULL))
     {
-      if (tv != 0)
+      if (tv != NULL)
 	{
 	  __set_errno (EINVAL);
 	  return -1;
diff --git a/sysdeps/unix/sysv/linux/sigwait.c b/sysdeps/unix/sysv/linux/sigwait.c
index 37de8db..f0dff83 100644
--- a/sysdeps/unix/sysv/linux/sigwait.c
+++ b/sysdeps/unix/sysv/linux/sigwait.c
@@ -25,7 +25,7 @@ __sigwait (const sigset_t *set, int *sig)
   siginfo_t si;
   int ret;
   do
-    ret = __sigtimedwait (set, &si, 0);
+    ret = __sigtimedwait (set, &si, NULL);
   /* Applications do not expect sigwait to return with EINTR, and the
      error code is not specified by POSIX.  */
   while (ret < 0 && errno == EINTR);
diff --git a/sysdeps/unix/sysv/linux/sigwaitinfo.c b/sysdeps/unix/sysv/linux/sigwaitinfo.c
index dba25bd..1d48b11 100644
--- a/sysdeps/unix/sysv/linux/sigwaitinfo.c
+++ b/sysdeps/unix/sysv/linux/sigwaitinfo.c
@@ -22,7 +22,7 @@
 int
 __sigwaitinfo (const sigset_t *set, siginfo_t *info)
 {
-  return __sigtimedwait (set, info, 0);
+  return __sigtimedwait (set, info, NULL);
 }
 
 libc_hidden_def (__sigwaitinfo)
diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c
index 1edf62c..85796c6 100644
--- a/sysdeps/unix/sysv/linux/spawni.c
+++ b/sysdeps/unix/sysv/linux/spawni.c
@@ -115,7 +115,7 @@ __spawni_child (void *arguments)
   memset (&sa, '\0', sizeof (sa));
 
   sigset_t hset;
-  __sigprocmask (SIG_BLOCK, 0, &hset);
+  __sigprocmask (SIG_BLOCK, NULL, &hset);
   for (int sig = 1; sig < _NSIG; ++sig)
     {
       if ((attr->__flags & POSIX_SPAWN_SETSIGDEF)
@@ -129,7 +129,7 @@ __spawni_child (void *arguments)
 	    sa.sa_handler = SIG_IGN;
 	  else
 	    {
-	      __libc_sigaction (sig, 0, &sa);
+	      __libc_sigaction (sig, NULL, &sa);
 	      if (sa.sa_handler == SIG_IGN || sa.sa_handler == SIG_DFL)
 		continue;
 	      sa.sa_handler = SIG_DFL;
@@ -138,7 +138,7 @@ __spawni_child (void *arguments)
       else
 	continue;
 
-      __libc_sigaction (sig, &sa, 0);
+      __libc_sigaction (sig, &sa, NULL);
     }
 
 #ifdef _POSIX_PRIORITY_SCHEDULING
@@ -172,7 +172,7 @@ __spawni_child (void *arguments)
     goto fail;
 
   /* Execute the file actions.  */
-  if (file_actions != 0)
+  if (file_actions != NULL)
     {
       int cnt;
       struct rlimit64 fdlimit;