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Standardized routines for forking processes (keeps all the specialized code in one place).

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@114188 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2008-04-16 22:57:54 +00:00
parent 752f6681b1
commit 123ac5fd64
13 changed files with 163 additions and 137 deletions
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63
main/app.c
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@@ -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();
}