Merged revisions 48375 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

................
r48375 | tilghman | 2006-12-10 18:47:21 -0600 (Sun, 10 Dec 2006) | 13 lines

Merged revisions 48374 via svnmerge from 
https://origsvn.digium.com/svn/asterisk/branches/1.2

........
r48374 | tilghman | 2006-12-10 18:33:59 -0600 (Sun, 10 Dec 2006) | 5 lines

When doing a fork() and exec(), two problems existed (Issue 8086):
1) Ignored signals stayed ignored after the exec().
2) Signals could possibly fire between the fork() and exec(), causing Asterisk
signal handlers within the child to execute, which caused nasty race conditions.

........

................


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@48376 f38db490-d61c-443f-a65b-d21fe96a405b

6 files changed, 74 insertions, 17 deletions

diff --git a/apps/app_externalivr.c b/apps/app_externalivr.c
index f9b890588..bcda8d663 100644
--- a/apps/app_externalivr.c
+++ b/apps/app_externalivr.c
@@ -40,6 +40,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
+#include <signal.h>
 
 #include "asterisk/lock.h"
 #include "asterisk/file.h"
@@ -262,9 +263,13 @@ static int app_exec(struct ast_channel *chan, void *data)
 		.finishlist = AST_LIST_HEAD_INIT_VALUE,
 	};
 	struct ivr_localuser *u = &foo;
+	sigset_t fullset, oldset;
 
 	lu = ast_module_user_add(chan);
-	
+
+	sigfillset(&fullset);
+	pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
+
 	u->abort_current_sound = 0;
 	u->chan = chan;
 	
@@ -313,6 +318,9 @@ static int app_exec(struct ast_channel *chan, void *data)
 		/* child process */
 		int i;
 
+		signal(SIGPIPE, SIG_DFL);
+		pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
+
 		if (ast_opt_high_priority)
 			ast_set_priority(0);
 
@@ -336,6 +344,8 @@ static int app_exec(struct ast_channel *chan, void *data)
 		int waitfds[2] = { child_errors_fd, child_commands_fd };
 		struct ast_channel *rchan;
 
+		pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+
 		close(child_stdin[0]);
 		child_stdin[0] = 0;
 		close(child_stdout[1]);
diff --git a/apps/app_festival.c b/apps/app_festival.c
index e02459873..7af2e78a6 100644
--- a/apps/app_festival.c
+++ b/apps/app_festival.c
@@ -130,19 +130,26 @@ static int send_waveform_to_fd(char *waveform, int length, int fd) {
 #ifdef __PPC__ 
 	char c;
 #endif
+	sigset_t fullset, oldset;
+
+	sigfillset(&fullset);
+	pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
 
         res = fork();
         if (res < 0)
                 ast_log(LOG_WARNING, "Fork failed\n");
-        if (res)
+        if (res) {
+		pthread_sigmask(SIG_SETMASK, &oldset, NULL);
                 return res;
+	}
         for (x=0;x<256;x++) {
                 if (x != fd)
                         close(x);
         }
 	if (ast_opt_high_priority)
 		ast_set_priority(0);
-
+	signal(SIGPIPE, SIG_DFL);
+	pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
 /*IAS */
 #ifdef __PPC__  
 	for( x=0; x<length; x+=2)
diff --git a/apps/app_ices.c b/apps/app_ices.c
index 869254738..91725fdc6 100644
--- a/apps/app_ices.c
+++ b/apps/app_ices.c
@@ -65,15 +65,27 @@ static int icesencode(char *filename, int fd)
 {
 	int res;
 	int x;
+	sigset_t fullset, oldset;
+
+	sigfillset(&fullset);
+	pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
+
 	res = fork();
 	if (res < 0) 
 		ast_log(LOG_WARNING, "Fork failed\n");
-	if (res)
+	if (res) {
+		pthread_sigmask(SIG_SETMASK, &oldset, NULL);
 		return res;
+	}
+
+	/* Stop ignoring PIPE */
+	signal(SIGPIPE, SIG_DFL);
+	pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
+
 	if (ast_opt_high_priority)
 		ast_set_priority(0);
 	dup2(fd, STDIN_FILENO);
-	for (x=STDERR_FILENO + 1;x<256;x++) {
+	for (x=STDERR_FILENO + 1;x<1024;x++) {
 		if ((x != STDIN_FILENO) && (x != STDOUT_FILENO))
 			close(x);
 	}
@@ -84,7 +96,7 @@ static int icesencode(char *filename, int fd)
 	/* As a last-ditch effort, try to use PATH */
 	execlp("ices", "ices", filename, (char *)NULL);
 	ast_log(LOG_WARNING, "Execute of ices failed\n");
-	return -1;
+	_exit(0);
 }
 
 static int ices_exec(struct ast_channel *chan, void *data)
diff --git a/apps/app_mp3.c b/apps/app_mp3.c
index 704666d8f..e0df37d61 100644
--- a/apps/app_mp3.c
+++ b/apps/app_mp3.c
@@ -64,15 +64,25 @@ static int mp3play(char *filename, int fd)
 {
 	int res;
 	int x;
+	sigset_t fullset, oldset;
+
+	sigfillset(&fullset);
+	pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
+
 	res = fork();
 	if (res < 0) 
 		ast_log(LOG_WARNING, "Fork failed\n");
-	if (res)
+	if (res) {
+		pthread_sigmask(SIG_SETMASK, &oldset, NULL);
 		return res;
+	}
 	if (ast_opt_high_priority)
 		ast_set_priority(0);
+	signal(SIGPIPE, SIG_DFL);
+	pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
+
 	dup2(fd, STDOUT_FILENO);
-	for (x=0;x<256;x++) {
+	for (x=STDERR_FILENO + 1;x<256;x++) {
 		if (x != STDOUT_FILENO)
 			close(x);
 	}
@@ -94,7 +104,7 @@ static int mp3play(char *filename, int fd)
 	    execlp("mpg123", "mpg123", "-q", "-s", "-f", "8192", "--mono", "-r", "8000", filename, (char *)NULL);
 	}
 	ast_log(LOG_WARNING, "Execute of mpg123 failed\n");
-	return -1;
+	_exit(0);
 }
 
 static int timed_read(int fd, void *data, int datalen, int timeout)
diff --git a/apps/app_nbscat.c b/apps/app_nbscat.c
index 60623cc93..1fb51e688 100644
--- a/apps/app_nbscat.c
+++ b/apps/app_nbscat.c
@@ -68,16 +68,26 @@ static int NBScatplay(int fd)
 {
 	int res;
 	int x;
+	sigset_t fullset, oldset;
+
+	sigfillset(&fullset);
+	pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
+
 	res = fork();
 	if (res < 0) 
 		ast_log(LOG_WARNING, "Fork failed\n");
-	if (res)
+	if (res) {
+		pthread_sigmask(SIG_SETMASK, &oldset, NULL);
 		return res;
+	}
+	signal(SIGPIPE, SIG_DFL);
+	pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
+
 	if (ast_opt_high_priority)
 		ast_set_priority(0);
 
 	dup2(fd, STDOUT_FILENO);
-	for (x=0;x<256;x++) {
+	for (x = STDERR_FILENO + 1; x < 1024; x++) {
 		if (x != STDOUT_FILENO)
 			close(x);
 	}
@@ -85,7 +95,7 @@ static int NBScatplay(int fd)
 	execl(NBSCAT, "nbscat8k", "-d", (char *)NULL);
 	execl(LOCAL_NBSCAT, "nbscat8k", "-d", (char *)NULL);
 	ast_log(LOG_WARNING, "Execute of nbscat8k failed\n");
-	return -1;
+	_exit(0);
 }
 
 static int timed_read(int fd, void *data, int datalen)
diff --git a/apps/app_zapras.c b/apps/app_zapras.c
index 9e841603c..7b85f7040 100644
--- a/apps/app_zapras.c
+++ b/apps/app_zapras.c
@@ -82,11 +82,23 @@ static pid_t spawn_ras(struct ast_channel *chan, char *args)
 	char *argv[PPP_MAX_ARGS];
 	int argc = 0;
 	char *stringp=NULL;
+	sigset_t fullset, oldset;
+
+	sigfillset(&fullset);
+	pthread_sigmask(SIG_BLOCK, &fullset, &oldset);
 
 	/* Start by forking */
 	pid = fork();
-	if (pid)
+	if (pid) {
+		pthread_sigmask(SIG_SETMASK, &oldset, NULL);
 		return pid;
+	}
+
+	/* Restore original signal handlers */
+	for (x=0;x<NSIG;x++)
+		signal(x, SIG_DFL);
+
+	pthread_sigmask(SIG_UNBLOCK, &fullset, NULL);
 
 	/* Execute RAS on File handles */
 	dup2(chan->fds[0], STDIN_FILENO);
@@ -99,10 +111,6 @@ static pid_t spawn_ras(struct ast_channel *chan, char *args)
 	for (x=STDERR_FILENO + 1;x<1024;x++) 
 		close(x);
 
-	/* Restore original signal handlers */
-	for (x=0;x<NSIG;x++)
-		signal(x, SIG_DFL);
-
 	/* Reset all arguments */
 	memset(argv, 0, sizeof(argv));