diff options
Diffstat (limited to 'res/res_agi.c')
| -rw-r--r-- | res/res_agi.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/res/res_agi.c b/res/res_agi.c index 022cee46e..1d39c6936 100644 --- a/res/res_agi.c +++ b/res/res_agi.c @@ -234,7 +234,7 @@ 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; + sigset_t signal_set, old_set; if (!strncasecmp(script, "agi://", 6)) return launch_netscript(script, argv, fds, efd, opid); @@ -276,6 +276,10 @@ static int launch_script(char *script, char *argv[], int *fds, int *efd, int *op return -1; } } + + /* Block SIGHUP during the fork - prevents a race */ + sigfillset(&signal_set); + pthread_sigmask(SIG_BLOCK, &signal_set, &old_set); pid = fork(); if (pid < 0) { ast_log(LOG_WARNING, "Failed to fork(): %s\n", strerror(errno)); @@ -293,9 +297,18 @@ static int launch_script(char *script, char *argv[], int *fds, int *efd, int *op } else { close(STDERR_FILENO + 1); } - + + /* Before we unblock our signals, return our trapped signals back to the defaults */ + signal(SIGHUP, SIG_DFL); + signal(SIGCHLD, SIG_DFL); + signal(SIGINT, SIG_DFL); + signal(SIGURG, SIG_DFL); + signal(SIGTERM, SIG_DFL); + signal(SIGPIPE, SIG_DFL); + signal(SIGXFSZ, SIG_DFL); + /* unblock important signal handlers */ - if (sigfillset(&signal_set) || pthread_sigmask(SIG_UNBLOCK, &signal_set, NULL)) { + if (pthread_sigmask(SIG_UNBLOCK, &signal_set, NULL)) { ast_log(LOG_WARNING, "unable to unblock signals for AGI script: %s\n", strerror(errno)); _exit(1); } @@ -310,6 +323,7 @@ static int launch_script(char *script, char *argv[], int *fds, int *efd, int *op fprintf(stderr, "Failed to execute '%s': %s\n", script, strerror(errno)); _exit(1); } + pthread_sigmask(SIG_SETMASK, &old_set, NULL); if (option_verbose > 2) ast_verbose(VERBOSE_PREFIX_3 "Launched AGI Script %s\n", script); fds[0] = toast[0]; |