Fix sighup with AGI (bug #4854)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6264 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_agi.c

@@ -211,6 +211,7 @@ static int launch_script(char *script, char *argv[], int *fds, int *efd, int *op
 	int audio[2];
 	int x;
 	int res;
+	sigset_t signal_set;
 	
 	if (!strncasecmp(script, "agi://", 6))
 		return launch_netscript(script, argv, fds, efd, opid);
@@ -266,9 +267,17 @@ static int launch_script(char *script, char *argv[], int *fds, int *efd, int *op
 		} else {
 			close(STDERR_FILENO + 1);
 		}
+		
+		/* unblock important signal handlers */
+		if (sigfillset(&signal_set) || pthread_sigmask(SIG_UNBLOCK, &signal_set, NULL)) {
+			ast_log(LOG_WARNING, "unable to unblock signals for AGI script: %s\n", strerror(errno));
+			exit(1);
+		}
+
 		/* Close everything but stdin/out/error */
 		for (x=STDERR_FILENO + 2;x<1024;x++) 
 			close(x);
+
 		/* Execute script */
 		execv(script, argv);
 		/* Can't use ast_log since FD's are closed */
@@ -430,7 +439,7 @@ static int handle_tddmode(struct ast_channel *chan, AGI *agi, int argc, char *ar
 	if (!strncasecmp(argv[2],"tdd",3))
 		x = 1;
 	res = ast_channel_setoption(chan, AST_OPTION_TDD, &x, sizeof(char), 0);
-	if(res != RESULT_SUCCESS)
+	if (res != RESULT_SUCCESS)
 		fdprintf(agi->fd, "200 result=0\n");
 	else
 		fdprintf(agi->fd, "200 result=1\n");
@@ -467,7 +476,7 @@ static int handle_streamfile(struct ast_channel *chan, AGI *agi, int argc, char
 		return RESULT_SHOWUSAGE;
 	
 	fs = ast_openstream(chan, argv[2], chan->language);
-	if(!fs){
+	if (!fs){
 		fdprintf(agi->fd, "200 result=%d endpos=%ld\n", 0, sample_offset);
 		return RESULT_SUCCESS;
 	}
@@ -523,7 +532,7 @@ static int handle_getoption(struct ast_channel *chan, AGI *agi, int argc, char *
 	}
 
         fs = ast_openstream(chan, argv[2], chan->language);
-        if(!fs){
+        if (!fs){
                 fdprintf(agi->fd, "200 result=%d endpos=%ld\n", 0, sample_offset);
                 ast_log(LOG_WARNING, "Unable to open %s\n", argv[2]);
 		return RESULT_SUCCESS;
@@ -1817,8 +1826,10 @@ static int run_agi(struct ast_channel *chan, char *request, AGI *agi, int pid, i
 		}
 	}
 	/* Notify process */
-	if (pid > -1)
-		kill(pid, SIGHUP);
+	if (pid > -1) {
+		if (kill(pid, SIGHUP))
+			ast_log(LOG_WARNING, "unable to send SIGHUP to AGI process %d: %s\n", pid, strerror(errno));
+	}
 	fclose(readf);
 	return returnstatus;
 }