mir/bind
2
0
Fork 0
mirror of https://gitlab.isc.org/isc-projects/bind9 synced 2025-09-05 09:05:40 +00:00
Code Issues Releases Wiki Activity

417. [func] Add isc_app_block() and isc_app_unblock(), which

Browse Source 
allow an application to handle signals while
                        blocking.
This commit is contained in:
Brian Wellington
2000-09-01 21:31:54 +00:00
parent da41917c3f
commit 1b32bc7da1
3 changed files with 82 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
lib/isc/unix/app.c
View File

@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: app.c,v 1.28 2000/08/30 23:47:16 bwelling Exp $ */
/* $Id: app.c,v 1.29 2000/09/01 21:31:51 bwelling Exp $ */
#include <config.h>
@@ -58,6 +58,11 @@ static isc_boolean_t want_shutdown = ISC_FALSE;
*/
static isc_boolean_t want_reload = ISC_FALSE;
static isc_boolean_t blocked = ISC_FALSE;
#ifdef ISC_PLATFORM_USETHREADS
static pthread_t blockedthread;
#endif
#ifdef HAVE_LINUXTHREADS
/*
* Linux has sigwait(), but it appears to prevent signal handlers from
@@ -521,3 +526,43 @@ isc_app_finish(void) {
DESTROYLOCK(&lock);
}
void
isc_app_block(void) {
#ifdef ISC_PLATFORM_USETHREADS
sigset_t sset;
#endif
REQUIRE(running);
REQUIRE(!blocked);
blocked = ISC_TRUE;
#ifdef ISC_PLATFORM_USETHREADS
blockedthread = pthread_self();
RUNTIME_CHECK(sigemptyset(&sset) == 0 &&
sigaddset(&sset, SIGINT) == 0 &&
sigaddset(&sset, SIGTERM) == 0);
RUNTIME_CHECK(pthread_sigmask(SIG_UNBLOCK, &sset, NULL) == 0);
#endif
}
void
isc_app_unblock(void) {
#ifdef ISC_PLATFORM_USETHREADS
sigset_t sset;
#endif
REQUIRE(running);
REQUIRE(blocked);
blocked = ISC_FALSE;
#ifdef ISC_PLATFORM_USETHREADS
REQUIRE(blockedthread == pthread_self());
RUNTIME_CHECK(sigemptyset(&sset) == 0 &&
sigaddset(&sset, SIGINT) == 0 &&
sigaddset(&sset, SIGTERM) == 0);
RUNTIME_CHECK(pthread_sigmask(SIG_BLOCK, &sset, NULL) == 0);
#endif
}