diff options
author | tilghman <tilghman@f38db490-d61c-443f-a65b-d21fe96a405b> | 2008-04-16 22:57:54 +0000 |
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committer | tilghman <tilghman@f38db490-d61c-443f-a65b-d21fe96a405b> | 2008-04-16 22:57:54 +0000 |
commit | d9fc402428c10315d158f7cf960c9592276b3c82 (patch) | |
tree | 6dea5b8c8d8bb81a47195b75172db608ff217382 /main/app.c | |
parent | c99aa3db824dfb5a6eddf4d7d96685e8eb1767d6 (diff) |
Standardized routines for forking processes (keeps all the specialized code in one place).
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@114188 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'main/app.c')
-rw-r--r-- | main/app.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/main/app.c b/main/app.c index ee72d1078..05cdf1748 100644 --- a/main/app.c +++ b/main/app.c @@ -32,6 +32,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$") #endif #include <regex.h> #include <sys/file.h> /* added this to allow to compile, sorry! */ +#include <signal.h> #include "asterisk/paths.h" /* use ast_config_AST_DATA_DIR */ #include "asterisk/channel.h" @@ -1759,3 +1760,65 @@ int ast_get_encoded_char(const char *stream, char *result, size_t *consumed) return 0; } +void ast_close_fds_above_n(int n) +{ + int x, null; + null = open("/dev/null", O_RDONLY); + for (x = n + 1; x <= (null >= 8192 ? null : 8192); x++) { + if (x != null) { + /* Side effect of dup2 is that it closes any existing fd without error. + * This prevents valgrind and other debugging tools from sending up + * false error reports. */ + dup2(null, x); + close(x); + } + } + close(null); +} + +int ast_safe_fork(int stop_reaper) +{ + sigset_t signal_set, old_set; + int pid; + + /* Don't let the default signal handler for children reap our status */ + if (stop_reaper) { + ast_replace_sigchld(); + } + + sigfillset(&signal_set); + pthread_sigmask(SIG_BLOCK, &signal_set, &old_set); + + pid = fork(); + + if (pid != 0) { + /* Fork failed or parent */ + pthread_sigmask(SIG_SETMASK, &old_set, NULL); + return pid; + } else { + /* Child */ + + /* 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 (pthread_sigmask(SIG_UNBLOCK, &signal_set, NULL)) { + ast_log(LOG_WARNING, "unable to unblock signals for AGI script: %s\n", strerror(errno)); + _exit(1); + } + + return pid; + } +} + +void ast_safe_fork_cleanup(void) +{ + ast_unreplace_sigchld(); +} + |