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authorJakub Hrozek <jhrozek@redhat.com>2009-08-03 11:55:36 +0200
committerStephen Gallagher <sgallagh@redhat.com>2009-08-11 12:29:35 -0400
commitdd8aaf74198c084fd0aa712d56c4511978f04ebe (patch)
tree32b5b07a2781ffe2381265f3ffeb8202cd216e91 /server/util
parentb3b55f167063417c285524ba35bd9298965b834a (diff)
downloadsssd-dd8aaf74198c084fd0aa712d56c4511978f04ebe.tar.gz
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Make child processes exit when parent dies
The child processes call prctl() and when their parent process is killed, they are sent SIGTERM using prctl. This is currently Linux-specific, for non-Linuxes, a similar effect is achieved by catching a set of common termination signals and sending SIGTERM to the process group.
Diffstat (limited to 'server/util')
-rw-r--r--server/util/server.c44
-rw-r--r--server/util/signal.m42
-rw-r--r--server/util/util.h1
3 files changed, 46 insertions, 1 deletions
diff --git a/server/util/server.c b/server/util/server.c
index fd6e4cdc..d20a823c 100644
--- a/server/util/server.c
+++ b/server/util/server.c
@@ -33,6 +33,10 @@
#include "ldb.h"
#include "confdb/confdb.h"
+#ifdef HAVE_PRCTL
+#include <sys/prctl.h>
+#endif
+
/*******************************************************************
Close the low 3 fd's and open dev/null in their place.
********************************************************************/
@@ -191,6 +195,21 @@ static void sig_term(int sig)
exit(0);
}
+#ifndef HAVE_PRCTL
+static void sig_segv_abrt(int sig)
+{
+#if HAVE_GETPGRP
+ static int done;
+ if (done == 0 && getpgrp() == getpid()) {
+ DEBUG(0,("%s: killing children\n", strsignal(sig)));
+ done = 1;
+ kill(-getpgrp(), SIGTERM);
+ }
+#endif /* HAVE_GETPGRP */
+ exit(1);
+}
+#endif /* HAVE_PRCTL */
+
/*
setup signal masks
*/
@@ -219,6 +238,14 @@ static void setup_signals(void)
CatchSignal(SIGHUP, sig_hup);
CatchSignal(SIGTERM, sig_term);
+
+#ifndef HAVE_PRCTL
+ /* If prctl is not defined on the system, try to handle
+ * some common termination signals gracefully */
+ CatchSignal(SIGSEGV, sig_segv_abrt);
+ CatchSignal(SIGABRT, sig_segv_abrt);
+#endif
+
}
/*
@@ -244,6 +271,23 @@ static void server_stdin_handler(struct tevent_context *event_ctx,
/*
main server helpers.
*/
+
+int die_if_parent_died(void)
+{
+#ifdef HAVE_PRCTL
+ int ret;
+
+ errno = 0;
+ ret = prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0);
+ if (ret != 0) {
+ ret = errno;
+ DEBUG(2, ("prctl failed [%d]: %s", ret, strerror(ret)));
+ return ret;
+ }
+#endif
+ return EOK;
+}
+
int server_setup(const char *name, int flags,
const char *conf_entry,
struct main_context **main_ctx)
diff --git a/server/util/signal.m4 b/server/util/signal.m4
index a778020e..747c7dbf 100644
--- a/server/util/signal.m4
+++ b/server/util/signal.m4
@@ -1 +1 @@
-AC_CHECK_FUNCS(sigprocmask sigblock sigaction getpgrp)
+AC_CHECK_FUNCS(sigprocmask sigblock sigaction getpgrp prctl)
diff --git a/server/util/util.h b/server/util/util.h
index e11bc51c..87965292 100644
--- a/server/util/util.h
+++ b/server/util/util.h
@@ -107,6 +107,7 @@ struct main_context {
struct confdb_ctx *confdb_ctx;
};
+int die_if_parent_died(void);
int server_setup(const char *name, int flags,
const char *conf_entry,
struct main_context **main_ctx);