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authorWilliam Hubbs <w.d.hubbs@gmail.com>2018-12-05 18:11:40 -0600
committerWilliam Hubbs <w.d.hubbs@gmail.com>2018-12-06 16:22:15 -0600
commitbebc604438f9586f26d0cad8bd72749ae84b4335 (patch)
treed225494a360991397b4a0fab8c7ae588427e7e61 /src/rc
parent9dae4f2e38ceae227933673e25db9583e8f610a6 (diff)
supervise-daemon: fix busy loop
This fixes #264.
Diffstat (limited to 'src/rc')
-rw-r--r--src/rc/supervise-daemon.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/src/rc/supervise-daemon.c b/src/rc/supervise-daemon.c
index 0d477a54..276ff2fb 100644
--- a/src/rc/supervise-daemon.c
+++ b/src/rc/supervise-daemon.c
@@ -184,13 +184,22 @@ static void re_exec_supervisor(void)
static void handle_signal(int sig)
{
int serrno = errno;
+ pid_t pid;
switch (sig) {
case SIGALRM:
do_healthcheck = 1;
break;
case SIGCHLD:
- while (waitpid((pid_t)(-1), NULL, WNOHANG) > 0) {}
+ if (exiting)
+ while (waitpid((pid_t)(-1), NULL, WNOHANG) > 0) {}
+ else {
+ while ((pid = waitpid((pid_t)(-1), NULL, WNOHANG|WNOWAIT)) > 0) {
+ if (pid == child_pid)
+ break;
+ pid = waitpid(pid, NULL, WNOHANG);
+ }
+ }
break;
case SIGTERM:
exiting = 1;
@@ -451,6 +460,7 @@ static void supervisor(char *exec, char **argv)
int healthcheck_respawn;
int i;
int nkilled;
+ int ready;
int sig_send;
pid_t health_pid;
pid_t wait_pid;
@@ -498,18 +508,18 @@ static void supervisor(char *exec, char **argv)
alarm(healthcheckdelay);
else if (healthchecktimer)
alarm(healthchecktimer);
- fifo_fd = open(fifopath, O_RDONLY |O_NONBLOCK);
failing = 0;
while (!exiting) {
healthcheck_respawn = 0;
- wait_pid = waitpid(child_pid, &i, WNOHANG);
- memset(buf, 0, sizeof(buf));
- if (fifo_fd >= 0) {
+ fifo_fd = open(fifopath, O_RDONLY);
+ if (fifo_fd > 0) {
+ memset(buf, 0, sizeof(buf));
count = read(fifo_fd, buf, sizeof(buf) - 1);
+ close(fifo_fd);
if (count != -1)
buf[count] = 0;
- }
- if (strlen(buf) > 0) {
+ if (count == 0)
+ continue;
syslog(LOG_DEBUG, "Received %s from fifo", buf);
if (strncasecmp(buf, "sig", 3) == 0) {
if ((sscanf(buf, "%s %d", cmd, &sig_send) == 2)
@@ -521,6 +531,7 @@ static void supervisor(char *exec, char **argv)
sig_send, child_pid);
}
}
+ continue;
}
if (do_healthcheck) {
do_healthcheck = 0;
@@ -553,6 +564,7 @@ static void supervisor(char *exec, char **argv)
syslog(LOG_INFO, "killed %d processes", nkilled);
continue;
}
+ wait_pid = waitpid(child_pid, &i, WNOHANG);
if (wait_pid == child_pid) {
if (WIFEXITED(i))
syslog(LOG_WARNING, "%s, pid %d, exited with return code %d",