shring sugnal-relared stuff a bit. BTW why constant memset is not inlined by gcc?

    text           data     bss     dec     hex filename
-  38015          18096    8636   64747    fceb lib/libpthread-0.9.30-svn.so
+  38001          18096    8636   64733    fcdd lib/libpthread-0.9.30-svn.so
- 274842           1835   19012  295689   48309 lib/libuClibc-0.9.30-svn.so
+ 274779           1835   19012  295626   482ca lib/libuClibc-0.9.30-svn.so

libc/signal/sigblock.c

@@ -19,6 +19,7 @@
 #define __UCLIBC_HIDE_DEPRECATED__
 #include <errno.h>
 #include <signal.h>
+#include <string.h>
 
 /* libc_hidden_proto(sigprocmask) */
 
@@ -30,12 +31,9 @@ int sigblock (int mask)
 {
   sigset_t set, oset;
 
-  if (sigset_set_old_mask (&set, mask) < 0)
-    return -1;
-
+  sigset_set_old_mask (&set, mask);
   if (sigprocmask (SIG_BLOCK, &set, &oset) < 0)
     return -1;
-
   return sigset_get_old_mask (&oset);
 }
 libc_hidden_def(sigblock)

libc/signal/sigignore.c

@@ -30,10 +30,10 @@ int sigignore (int sig)
 {
   struct sigaction act;
 
+  memset(&act, 0, sizeof(act));
+  /*__sigemptyset (&act.sa_mask);*/
+  /*act.sa_flags = 0;*/
   act.sa_handler = SIG_IGN;
-  if (__sigemptyset (&act.sa_mask) < 0)
-    return -1;
-  act.sa_flags = 0;
 
   return sigaction (sig, &act, NULL);
 }

libc/signal/signal.c

@@ -42,9 +42,8 @@ __bsd_signal (int sig, __sighandler_t handler)
     }
 
   act.sa_handler = handler;
-  if (__sigemptyset (&act.sa_mask) < 0
-      || __sigaddset (&act.sa_mask, sig) < 0)
-    return SIG_ERR;
+  __sigemptyset (&act.sa_mask);
+  __sigaddset (&act.sa_mask, sig);
   act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART;
   if (sigaction (sig, &act, &oact) < 0)
     return SIG_ERR;

libc/signal/sigpause.c

@@ -23,6 +23,7 @@
 #define __FAVOR_BSD
 #include <signal.h>
 #include <stddef.h>		/* For NULL.  */
+#include <string.h>
 
 /* libc_hidden_proto(sigprocmask) */
 /* libc_hidden_proto(sigdelset) */
@@ -37,16 +38,18 @@ int __sigpause (int sig_or_mask, int is_sig)
 {
   sigset_t set;
 
-  if (is_sig != 0)
+  if (is_sig)
     {
+//TODO: error check for sig_or_mask = BIGNUM?
+
       /* The modern X/Open implementation is requested.  */
       if (sigprocmask (0, NULL, &set) < 0
 	  /* Yes, we call `sigdelset' and not `__sigdelset'.  */
 	  || sigdelset (&set, sig_or_mask) < 0)
 	return -1;
     }
-  else if (sigset_set_old_mask (&set, sig_or_mask) < 0)
-    return -1;
+  else
+    sigset_set_old_mask (&set, sig_or_mask);
 
   return sigsuspend (&set);
 }

libc/signal/sigset-cvt-mask.h

@@ -19,22 +19,12 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-static __inline__ int __attribute__ ((unused))
+static __inline__ void __attribute__ ((unused))
 sigset_set_old_mask (sigset_t *set, int mask)
 {
-  unsigned long int *ptr;
-  int cnt;
-
-  ptr = &set->__val[0];
-
-  *ptr++ = (unsigned int) mask;
-
-  cnt = _SIGSET_NWORDS - 2;
-  do
-    *ptr++ = 0ul;
-  while (--cnt >= 0);
-
-  return 0;
+  if (_SIGSET_NWORDS > 1)
+    memset(set, 0, sizeof(*set));
+  set->__val[0] = (unsigned int) mask;
 }
 
 static __inline__ int __attribute__ ((unused))

libc/signal/sigset.c

@@ -31,17 +31,20 @@ __sighandler_t sigset (int sig, __sighandler_t disp)
   struct sigaction act, oact;
   sigset_t set;
 
+  /* Check signal extents to protect __sigismember.  */
+  if (disp == SIG_ERR || sig < 1 || sig >= NSIG)
+    {
+      __set_errno (EINVAL);
+      return SIG_ERR;
+    }
+
 #ifdef SIG_HOLD
   /* Handle SIG_HOLD first.  */
   if (disp == SIG_HOLD)
     {
       /* Create an empty signal set.  */
-      if (__sigemptyset (&set) < 0)
-	return SIG_ERR;
-
-      /* Add the specified signal.  */
-      if (__sigaddset (&set, sig) < 0)
-	return SIG_ERR;
+      __sigemptyset (&set);
+      __sigaddset (&set, sig);
 
       /* Add the signal set to the current signal mask.  */
       if (sigprocmask (SIG_BLOCK, &set, NULL) < 0)
@@ -51,27 +54,16 @@ __sighandler_t sigset (int sig, __sighandler_t disp)
     }
 #endif	/* SIG_HOLD */
 
-  /* Check signal extents to protect __sigismember.  */
-  if (disp == SIG_ERR || sig < 1 || sig >= NSIG)
-    {
-      __set_errno (EINVAL);
-      return SIG_ERR;
-    }
-
+  memset(&act, 0, sizeof(act));
+  //__sigemptyset (&act.sa_mask);
+  //act.sa_flags = 0;
   act.sa_handler = disp;
-  if (__sigemptyset (&act.sa_mask) < 0)
-    return SIG_ERR;
-  act.sa_flags = 0;
   if (sigaction (sig, &act, &oact) < 0)
     return SIG_ERR;
 
-  /* Create an empty signal set.  */
-  if (__sigemptyset (&set) < 0)
-    return SIG_ERR;
-
-  /* Add the specified signal.  */
-  if (__sigaddset (&set, sig) < 0)
-    return SIG_ERR;
+  /* Create an empty signal set. Add the specified signal.  */
+  __sigemptyset (&set);
+  __sigaddset (&set, sig);
 
   /* Remove the signal set from the current signal mask.  */
   if (sigprocmask (SIG_UNBLOCK, &set, NULL) < 0)

libc/signal/sigsetmask.c

@@ -19,6 +19,7 @@
 #define __UCLIBC_HIDE_DEPRECATED__
 #include <errno.h>
 #include <signal.h>
+#include <string.h>
 
 /* libc_hidden_proto(sigprocmask) */
 
@@ -31,13 +32,9 @@ sigsetmask (int mask)
 {
   sigset_t set, oset;
 
-  if (sigset_set_old_mask (&set, mask) < 0)
-    return -1;
-
+  sigset_set_old_mask (&set, mask);
   if (sigprocmask (SIG_SETMASK, &set, &oset) < 0)
     return -1;
-
-
   return sigset_get_old_mask (&oset);
 }
 libc_hidden_def(sigsetmask)

libc/signal/sigwait.c

@@ -28,8 +28,8 @@
 int __sigwait (const sigset_t *set, int *sig) attribute_hidden;
 int __sigwait (const sigset_t *set, int *sig)
 {
-	int ret = 1;
-	if ((ret = sigwaitinfo(set, NULL)) != -1) {
+	int ret = sigwaitinfo(set, NULL);
+	if (ret != -1) {
 		*sig = ret;
 		return 0;
 	}
@@ -41,7 +41,7 @@ int __sigwait (const sigset_t *set, int *sig)
 /* libc_hidden_proto(sigaction) */
 /* libc_hidden_proto(sigsuspend) */
 
-static int was_sig; /* obviously not thread-safe */
+static smallint was_sig; /* obviously not thread-safe */
 static void ignore_signal(int sig)
 {
 	was_sig = sig;

libc/signal/sysv_signal.c

@@ -47,10 +47,8 @@ __sighandler_t __sysv_signal (int sig, __sighandler_t handler)
     }
 
   act.sa_handler = handler;
-  if (__sigemptyset (&act.sa_mask) < 0)
-    return SIG_ERR;
-  act.sa_flags = SA_ONESHOT | SA_NOMASK | SA_INTERRUPT;
-  act.sa_flags &= ~SA_RESTART;
+  __sigemptyset (&act.sa_mask);
+  act.sa_flags = (SA_ONESHOT | SA_NOMASK | SA_INTERRUPT) & ~SA_RESTART;
   if (sigaction (sig, &act, &oact) < 0)
     return SIG_ERR;
 

libc/stdlib/abort.c

@@ -60,9 +60,9 @@ void abort(void)
 	__UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(mylock);
 
 	/* Unmask SIGABRT to be sure we can get it */
-	if (__sigemptyset(&sigs) == 0 && __sigaddset(&sigs, SIGABRT) == 0) {
-		sigprocmask(SIG_UNBLOCK, &sigs, (sigset_t *) NULL);
-	}
+	__sigemptyset(&sigs);
+	__sigaddset(&sigs, SIGABRT);
+	sigprocmask(SIG_UNBLOCK, &sigs, (sigset_t *) NULL);
 
 	while (1) {
 		/* Try to suicide with a SIGABRT */
@@ -91,9 +91,10 @@ abort_it:
 
 			been_there_done_that++;
 			memset(&act, '\0', sizeof(struct sigaction));
-			act.sa_handler = SIG_DFL;
+			if (SIG_DFL) /* if it's constant zero, already done */
+				act.sa_handler = SIG_DFL;
 			__sigfillset(&act.sa_mask);
-			act.sa_flags = 0;
+			/*act.sa_flags = 0; - memset did it */
 			sigaction(SIGABRT, &act, NULL);
 
 			goto abort_it;

libc/sysdeps/linux/alpha/sigprocmask.c

@@ -51,10 +51,9 @@ sigprocmask (int how, const sigset_t *set, sigset_t *oset)
 
   if (oset)
     {
+      if (_SIGSET_NWORDS > 1)
+        memset(oset, 0, sizeof(*oset));
       oset->__val[0] = result;
-      result = _SIGSET_NWORDS;
-      while (--result > 0)
-	oset->__val[result] = 0;
     }
   return 0;
 }

libc/sysdeps/linux/common/ssp.c

@@ -57,10 +57,11 @@ static void block_signals(void)
 	sigprocmask(SIG_BLOCK, &mask, NULL);	/* except SSP_SIGTYPE */
 
 	/* Make the default handler associated with the signal handler */
-	memset(&sa, 0, sizeof(struct sigaction));
+	memset(&sa, 0, sizeof(sa));
 	sigfillset(&sa.sa_mask);	/* Block all signals */
-	sa.sa_flags = 0;
-	sa.sa_handler = SIG_DFL;
+	/* sa.sa_flags = 0; - memset did it */
+	if (SIG_DFL) /* if it's constant zero, it's already done */
+		sa.sa_handler = SIG_DFL;
 	sigaction(SSP_SIGTYPE, &sa, NULL);
 }
 

libc/unistd/sleep.c

@@ -66,9 +66,9 @@ unsigned int sleep (unsigned int seconds)
     /* Linux will wake up the system call, nanosleep, when SIGCHLD
        arrives even if SIGCHLD is ignored.  We have to deal with it
        in libc.  We block SIGCHLD first.  */
-    if (__sigemptyset (&set) < 0
-	    || __sigaddset (&set, SIGCHLD) < 0
-	    || sigprocmask (SIG_BLOCK, &set, &oset))
+    __sigemptyset (&set);
+    __sigaddset (&set, SIGCHLD);
+    if (sigprocmask (SIG_BLOCK, &set, &oset))
 	return -1;
 
     /* If SIGCHLD is already blocked, we don't have to do anything.  */
@@ -77,8 +77,8 @@ unsigned int sleep (unsigned int seconds)
 	int saved_errno;
 	struct sigaction oact;
 
-	if (__sigemptyset (&set) < 0 || __sigaddset (&set, SIGCHLD) < 0)
-	    return -1;
+	__sigemptyset (&set);
+	__sigaddset (&set, SIGCHLD);
 
 	/* We get the signal handler for SIGCHLD.  */
 	if (sigaction (SIGCHLD, (struct sigaction *) NULL, &oact) < 0)
@@ -136,9 +136,9 @@ unsigned int sleep (unsigned int seconds)
 	return 0;
 
     /* block SIGALRM */
-    if (__sigemptyset (&set) < 0
-	    || __sigaddset (&set, SIGALRM) < 0
-	    || sigprocmask (SIG_BLOCK, &set, &oset))
+    __sigemptyset (&set);
+    __sigaddset (&set, SIGALRM);
+    if (sigprocmask (SIG_BLOCK, &set, &oset))
 	return seconds;
 
     act.sa_handler = sleep_alarm_handler;

libpthread/linuxthreads.old/pthread.c

@@ -928,9 +928,11 @@ void __pthread_kill_other_threads_np(void)
   /* Reset the signal handlers behaviour for the signals the
      implementation uses since this would be passed to the new
      process.  */
-  sigemptyset(&sa.sa_mask);
-  sa.sa_flags = 0;
-  sa.sa_handler = SIG_DFL;
+  memset(&sa, 0, sizeof(sa));
+  /*sigemptyset(&sa.sa_mask);*/
+  /*sa.sa_flags = 0;*/
+  if (SIG_DFL) /* if it's constant zero, it's already done */
+    sa.sa_handler = SIG_DFL;
   __libc_sigaction(__pthread_sig_restart, &sa, NULL);
   __libc_sigaction(__pthread_sig_cancel, &sa, NULL);
   if (__pthread_sig_debug > 0)

libpthread/linuxthreads/pthread.c

@@ -1151,9 +1151,11 @@ void __pthread_kill_other_threads_np(void)
   /* Reset the signal handlers behaviour for the signals the
      implementation uses since this would be passed to the new
      process.  */
-  sigemptyset(&sa.sa_mask);
-  sa.sa_flags = 0;
-  sa.sa_handler = SIG_DFL;
+  memset(&sa, 0, sizeof(sa));
+  /*sigemptyset(&sa.sa_mask);*/
+  /*sa.sa_flags = 0;*/
+  if (SIG_DFL) /* if it's constant zero, it's already done too */
+    sa.sa_handler = SIG_DFL;
   __libc_sigaction(__pthread_sig_restart, &sa, NULL);
   __libc_sigaction(__pthread_sig_cancel, &sa, NULL);
   if (__pthread_sig_debug > 0)