X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2FSigHand.c;h=6112700af7a7525eba3c574aecd01d95dc7373ca;hp=53d185a08f50be41176c66ac1683fa2c2e840b0e;hb=eefeeaee57a56cfe1ff8c02a26c44d6f87f1368c;hpb=9c3be0a6a901fad667ba1abcd8b46c712020cf26

diff --git a/sources/SigHand.c b/sources/SigHand.c
index 53d185a..6112700 100644
--- a/sources/SigHand.c
+++ b/sources/SigHand.c
@@ -22,7 +22,7 @@
  *
  * Author: S. Piccardi Dec. 2002
  *
- * $Id: SigHand.c,v 1.2 2002/12/03 22:30:11 piccardi Exp $
+ * $Id: SigHand.c,v 1.7 2003/05/06 14:05:12 piccardi Exp $
  *
  *****************************************************************************/
 #include <errno.h>                               /* error simbol definitions */
@@ -49,26 +49,55 @@
 inline SigFunc * Signal(int signo, SigFunc *func) 
 {
     struct sigaction new_handl, old_handl;
-    new_handl.sa_handler=func;
+    new_handl.sa_handler = func;             /* set signal handler */
     /* clear signal mask: no signal blocked during execution of func */
-    if (sigemptyset(&new_handl.sa_mask)!=0){        /* initialize signal set */
-        perror("cannot initializes the signal set to empty");   /* see mess. */
-        exit(1);
+    if (sigemptyset(&new_handl.sa_mask)!=0){ /* initialize signal set */
+        return SIG_ERR;
     }
-    new_handl.sa_flags=0;                  /* init to 0 all flags */
+    new_handl.sa_flags=0;                    /* init to 0 all flags */
     /* change action for signo signal */
-    if (sigaction(signo,&new_handl,&old_handl)){ 
-        perror("sigaction failed on signal action setting");
-	exit(1);
+    if (sigaction(signo, &new_handl, &old_handl)){ 
+        return SIG_ERR;
     }
     return (old_handl.sa_handler);
 }
+
+/*
+ * Function SignalRestart
+ * Initialize a signal handler.
+ * To enable the signal handling a process we need to tell it to
+ * kernel; this is done writing all needed info to a sigaction structure
+ * named sigact, and then callind sigaction() system call passing the
+ * information stored in the sigact structure variable.
+ * This version enable BSD semantics with SA_RESTART
+ *
+ * Input:  the signal to handle 
+ *         the signal handler function
+ * Return: the previous sigaction structure
+ */
+inline SigFunc * SignalRestart(int signo, SigFunc *func) 
+{
+    struct sigaction new_handl, old_handl;
+    new_handl.sa_handler = func;             /* set signal handler */
+    new_handl.sa_flags = SA_RESTART;         /* restart system call */
+    /* clear signal mask: no signal blocked during execution of func */
+    if (sigemptyset(&new_handl.sa_mask)!=0){ /* initialize signal set */
+        return SIG_ERR;
+    }
+    /* change action for signo signal */
+    if (sigaction(signo, &new_handl, &old_handl)){ 
+        return SIG_ERR;
+    }
+    return (old_handl.sa_handler);
+}
+
+
 /* 
  * Functions: HandSigCHLD
  * Generic handler for SIGCHLD signal
  * 
  * Simone Piccardi Dec. 2002
- * $Id: SigHand.c,v 1.2 2002/12/03 22:30:11 piccardi Exp $
+ * $Id: SigHand.c,v 1.7 2003/05/06 14:05:12 piccardi Exp $
  */
 void HandSigCHLD(int sig)
 {
@@ -81,9 +110,9 @@ void HandSigCHLD(int sig)
     do {
 	errno = 0;
 	pid = waitpid(WAIT_ANY, &status, WNOHANG);
-	if (pid > 0) {
-	    debug("child %d terminated with status %x\n", pid, status);
-	}
+//	if (pid > 0) {
+//	    debug("child %d terminated with status %x\n", pid, status);
+//	}
     } while ((pid > 0) && (errno == EINTR));
     /* restore errno value*/
     errno = errno_save;