isc_result_t
isc__app_start(void) {
isc_g_appctx.common.impmagic = APPCTX_MAGIC;
isc_g_appctx.common.magic = ISCAPI_APPCTX_MAGIC;
isc_g_appctx.common.methods = &appmethods.methods;
isc_g_appctx.mctx = NULL;
/* The remaining members will be initialized in ctxstart() */
return (isc__app_ctxstart((isc_appctx_t *)&isc_g_appctx));
}
ISC_APPFUNC_SCOPE isc_result_t
isc__app_start(void) {
isc_result_t result;
int presult;
sigset_t sset;
char strbuf[ISC_STRERRORSIZE];
isc_g_appctx.common.impmagic = APPCTX_MAGIC;
isc_g_appctx.common.magic = ISCAPI_APPCTX_MAGIC;
isc_g_appctx.common.methods = &appmethods.methods;
isc_g_appctx.mctx = NULL;
/* The remaining members will be initialized in ctxstart() */
result = isc__app_ctxstart((isc_appctx_t *)&isc_g_appctx);
if (result != ISC_R_SUCCESS)
return (result);
#ifndef HAVE_SIGWAIT
/*
* Install do-nothing handlers for SIGINT and SIGTERM.
*
* We install them now because BSDI 3.1 won't block
* the default actions, regardless of what we do with
* pthread_sigmask().
*/
result = handle_signal(SIGINT, exit_action);
if (result != ISC_R_SUCCESS)
return (result);
result = handle_signal(SIGTERM, exit_action);
if (result != ISC_R_SUCCESS)
return (result);
#endif
/*
* Always ignore SIGPIPE.
*/
result = handle_signal(SIGPIPE, SIG_IGN);
if (result != ISC_R_SUCCESS)
return (result);
/*
* On Solaris 2, delivery of a signal whose action is SIG_IGN
* will not cause sigwait() to return. We may have inherited
* unexpected actions for SIGHUP, SIGINT, and SIGTERM from our parent
* process (e.g, Solaris cron). Set an action of SIG_DFL to make
* sure sigwait() works as expected. Only do this for SIGTERM and
* SIGINT if we don't have sigwait(), since a different handler is
* installed above.
*/
result = handle_signal(SIGHUP, SIG_DFL);
if (result != ISC_R_SUCCESS)
return (result);
#ifdef HAVE_SIGWAIT
result = handle_signal(SIGTERM, SIG_DFL);
if (result != ISC_R_SUCCESS)
return (result);
result = handle_signal(SIGINT, SIG_DFL);
if (result != ISC_R_SUCCESS)
return (result);
#endif
#ifdef ISC_PLATFORM_USETHREADS
/*
* Block SIGHUP, SIGINT, SIGTERM.
*
* If isc_app_start() is called from the main thread before any other
* threads have been created, then the pthread_sigmask() call below
* will result in all threads having SIGHUP, SIGINT and SIGTERM
* blocked by default, ensuring that only the thread that calls
* sigwait() for them will get those signals.
*/
if (sigemptyset(&sset) != 0 ||
sigaddset(&sset, SIGHUP) != 0 ||
sigaddset(&sset, SIGINT) != 0 ||
sigaddset(&sset, SIGTERM) != 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_app_start() sigsetops: %s", strbuf);
return (ISC_R_UNEXPECTED);
}
presult = pthread_sigmask(SIG_BLOCK, &sset, NULL);
if (presult != 0) {
isc__strerror(presult, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_app_start() pthread_sigmask: %s",
strbuf);
return (ISC_R_UNEXPECTED);
}
#else /* ISC_PLATFORM_USETHREADS */
/*
* Unblock SIGHUP, SIGINT, SIGTERM.
*
* If we're not using threads, we need to make sure that SIGHUP,
* SIGINT and SIGTERM are not inherited as blocked from the parent
* process.
*/
if (sigemptyset(&sset) != 0 ||
sigaddset(&sset, SIGHUP) != 0 ||
sigaddset(&sset, SIGINT) != 0 ||
sigaddset(&sset, SIGTERM) != 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_app_start() sigsetops: %s", strbuf);
return (ISC_R_UNEXPECTED);
}
presult = sigprocmask(SIG_UNBLOCK, &sset, NULL);
if (presult != 0) {
isc__strerror(presult, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_app_start() sigprocmask: %s", strbuf);
return (ISC_R_UNEXPECTED);
}
#endif /* ISC_PLATFORM_USETHREADS */
return (ISC_R_SUCCESS);
}
