d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Switch to sigprocmask(2) API also in the main process and secondary process.

Browse Source 
This way the primary process inherits signal mask from the main process,
which fixes a race where signal is delivered to the primary process before
configuring signal mask.

Reported by:	Mikolaj Golub <to.my.trociny@gmail.com>
MFC after:	3 days
This commit is contained in:
Pawel Jakub Dawidek 2010-09-22 19:08:11 +00:00
parent 196abd3518
commit 9dd5a6cb0f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=213009
4 changed files with 44 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
sbin/hastd/hastd.c
View File

@ -63,10 +63,6 @@ __FBSDID("$FreeBSD$");
const char *cfgpath = HAST_CONFIG;
/* Hastd configuration. */
static struct hastd_config *cfg;
/* Was SIGCHLD signal received? */
bool sigchld_received = false;
/* Was SIGHUP signal received? */
bool sighup_received = false;
/* Was SIGINT or SIGTERM signal received? */
bool sigexit_received = false;
/* PID file handle. */
@ -82,26 +78,6 @@ usage(void)
errx(EX_USAGE, "[-dFh] [-c config] [-P pidfile]");
}
static void
sighandler(int sig)
{
switch (sig) {
case SIGINT:
case SIGTERM:
sigexit_received = true;
break;
case SIGCHLD:
sigchld_received = true;
break;
case SIGHUP:
sighup_received = true;
break;
default:
assert(!"invalid condition");
}
}
static void
g_gate_load(void)
{
@ -625,26 +601,41 @@ static void
main_loop(void)
{
struct hast_resource *res;
struct timeval timeout;
int fd, maxfd, ret;
struct timeval seltimeout;
struct timespec sigtimeout;
int fd, maxfd, ret, signo;
sigset_t mask;
fd_set rfds;
timeout.tv_sec = REPORT_INTERVAL;
timeout.tv_usec = 0;
seltimeout.tv_sec = REPORT_INTERVAL;
seltimeout.tv_usec = 0;
sigtimeout.tv_sec = 0;
sigtimeout.tv_nsec = 0;
PJDLOG_VERIFY(sigemptyset(&mask) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0);
for (;;) {
if (sigexit_received) {
sigexit_received = false;
terminate_workers();
exit(EX_OK);
}
if (sigchld_received) {
sigchld_received = false;
child_exit();
}
if (sighup_received) {
sighup_received = false;
hastd_reload();
while ((signo = sigtimedwait(&mask, NULL, &sigtimeout)) != -1) {
switch (signo) {
case SIGINT:
case SIGTERM:
sigexit_received = true;
terminate_workers();
exit(EX_OK);
break;
case SIGCHLD:
child_exit();
break;
case SIGHUP:
hastd_reload();
break;
default:
assert(!"invalid condition");
}
}
/* Setup descriptors for select(2). */
@ -666,7 +657,7 @@ main_loop(void)
}
assert(maxfd + 1 <= (int)FD_SETSIZE);
ret = select(maxfd + 1, &rfds, NULL, NULL, &timeout);
ret = select(maxfd + 1, &rfds, NULL, NULL, &seltimeout);
if (ret == 0)
hook_check(false);
else if (ret == -1) {
@ -701,6 +692,7 @@ main(int argc, char *argv[])
pid_t otherpid;
bool foreground;
int debuglevel;
sigset_t mask;
g_gate_load();
@ -751,10 +743,12 @@ main(int argc, char *argv[])
cfg = yy_config_parse(cfgpath, true);
assert(cfg != NULL);
signal(SIGINT, sighandler);
signal(SIGTERM, sighandler);
signal(SIGHUP, sighandler);
signal(SIGCHLD, sighandler);
PJDLOG_VERIFY(sigemptyset(&mask) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0);
PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
/* Listen on control address. */
if (proto_server(cfg->hc_controladdr, &cfg->hc_controlconn) < 0) {

2
sbin/hastd/hastd.h
View File

@ -40,7 +40,7 @@
#include "hast.h"
extern const char *cfgpath;
extern bool sigchld_received, sigexit_received, sighup_received;
extern bool sigexit_received;
extern struct pidfh *pfh;
void hastd_primary(struct hast_resource *res);

13
sbin/hastd/primary.c
View File

@ -313,7 +313,6 @@ init_environment(struct hast_resource *res __unused)
{
struct hio *hio;
unsigned int ii, ncomps;
sigset_t mask;
/*
* In the future it might be per-resource value.
@ -420,15 +419,6 @@ init_environment(struct hast_resource *res __unused)
hio->hio_ggio.gctl_error = 0;
TAILQ_INSERT_HEAD(&hio_free_list, hio, hio_free_next);
}
/*
* Turn on signals handling.
*/
PJDLOG_VERIFY(sigemptyset(&mask) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
}
static void
@ -800,9 +790,6 @@ hastd_primary(struct hast_resource *res)
setproctitle("%s (primary)", res->hr_name);
signal(SIGHUP, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
/* Declare that we are sender. */
proto_send(res->hr_event, NULL, 0);

6
sbin/hastd/secondary.c
View File

@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$");
#include <fcntl.h>
#include <libgeom.h>
#include <pthread.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
@ -334,6 +335,7 @@ init_remote(struct hast_resource *res, struct nv *nvin)
void
hastd_secondary(struct hast_resource *res, struct nv *nvin)
{
sigset_t mask;
pthread_t td;
pid_t pid;
int error;
@ -380,8 +382,8 @@ hastd_secondary(struct hast_resource *res, struct nv *nvin)
setproctitle("%s (secondary)", res->hr_name);
signal(SIGHUP, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
PJDLOG_VERIFY(sigemptyset(&mask) == 0);
PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
/* Declare that we are sender. */
proto_send(res->hr_event, NULL, 0);