linux/sigsetops: fix type confusion (bug 31468)

Each mask in the sigset array is an unsigned long, so fix __sigisemptyset
to use that instead of int.  The __sigword function returns a simple array
index, so it can return int instead of unsigned long.

signal/tst-sigisemptyset.c

@@ -89,6 +89,17 @@ do_test (void)
     TEST_COMPARE (sigisemptyset (&set), 1);
   }
 
+  {
+    sigset_t set;
+    for (int sig = 1; sig <= NSIG; sig++)
+      {
+	sigemptyset (&set);
+	if (sigaddset (&set, sig) < 0)
+	  continue;
+	TEST_COMPARE (sigisemptyset (&set), 0);
+      }
+  }
+
   return 0;
 }
 

sysdeps/unix/sysv/linux/internal-sigset.h

@@ -54,7 +54,7 @@ static inline int
 internal_sigisemptyset (const internal_sigset_t *set)
 {
   int cnt = __NSIG_WORDS;
-  int ret = set->__val[--cnt];
+  unsigned long int ret = set->__val[--cnt];
   while (ret == 0 && --cnt >= 0)
     ret = set->__val[cnt];
   return ret == 0;
@@ -82,7 +82,7 @@ static inline int
 internal_sigismember (const internal_sigset_t *set, int sig)
 {
   unsigned long int mask = __sigmask (sig);
-  unsigned long int word = __sigword (sig);
+  int word = __sigword (sig);
   return set->__val[word] & mask ? 1 : 0;
 }
 
@@ -90,7 +90,7 @@ static inline void
 internal_sigaddset (internal_sigset_t *set, int sig)
 {
   unsigned long int mask = __sigmask (sig);
-  unsigned long int word = __sigword (sig);
+  int word = __sigword (sig);
   set->__val[word] |= mask;
 }
 
@@ -98,7 +98,7 @@ static inline void
 internal_sigdelset (internal_sigset_t *set, int sig)
 {
   unsigned long int mask = __sigmask (sig);
-  unsigned long int word = __sigword (sig);
+  int word = __sigword (sig);
   set->__val[word] &= ~mask;
 }
 

sysdeps/unix/sysv/linux/sigsetops.h

@@ -28,7 +28,7 @@
   (1UL << (((sig) - 1) % ULONG_WIDTH))
 
 /* Return the word index for SIG.  */
-static inline unsigned long int
+static inline int
 __sigword (int sig)
 {
   return (sig - 1) / ULONG_WIDTH;
@@ -66,7 +66,7 @@ static inline int
 __sigisemptyset (const sigset_t *set)
 {
   int cnt = __NSIG_WORDS;
-  int ret = set->__val[--cnt];
+  unsigned long int ret = set->__val[--cnt];
   while (ret == 0 && --cnt >= 0)
     ret = set->__val[cnt];
   return ret == 0;
@@ -92,7 +92,7 @@ static inline int
 __sigismember (const sigset_t *set, int sig)
 {
   unsigned long int mask = __sigmask (sig);
-  unsigned long int word = __sigword (sig);
+  int word = __sigword (sig);
   return set->__val[word] & mask ? 1 : 0;
 }
 
@@ -100,7 +100,7 @@ static inline void
 __sigaddset (sigset_t *set, int sig)
 {
   unsigned long int mask = __sigmask (sig);
-  unsigned long int word = __sigword (sig);
+  int word = __sigword (sig);
   set->__val[word] |= mask;
 }
 
@@ -108,7 +108,7 @@ static inline void
 __sigdelset (sigset_t *set, int sig)
 {
   unsigned long int mask = __sigmask (sig);
-  unsigned long int word = __sigword (sig);
+  int word = __sigword (sig);
   set->__val[word] &= ~mask;
 }