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Improved child exit waiting functionality. Also send a bit milder signal

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to child at close.
This commit is contained in:
Antti Seppälä 2007-10-19 18:03:19 +00:00
parent 50bed6a8c6
commit 5dc7117720
1 changed files with 36 additions and 12 deletions
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36
protocolext.c
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@ -3,7 +3,7 @@
*
* See the README file for copyright information and how to reach the author.
*
* $Id: protocolext.c,v 1.4 2007/10/18 19:33:15 rahrenbe Exp $
* $Id: protocolext.c,v 1.5 2007/10/19 18:03:19 ajhseppa Exp $
*/
#include <sys/wait.h>
@ -141,18 +141,42 @@ void cIptvProtocolExt::TerminateCommand(void)
if (pid > 0) {
const unsigned int timeoutms = 100;
unsigned int waitms = 0;
siginfo_t waitStatus;
int retval = 0;
bool waitOver = false;
// signal and wait for termination
kill(pid, SIGTERM);
while (waitpid(pid, NULL, WNOHANG) == 0) {
kill(pid, SIGINT);
do {
retval = 0;
waitms += timeoutms;
// Signal kill every 2 seconds
if ((waitms % 2000) == 0) {
error("ERROR: Script '%s' won't terminate - killing it", streamAddr);
kill(pid, SIGKILL);
}
// Sleep for awhile
cCondWait::SleepMs(timeoutms);
// Clear wait status to make sure child exit status is accessible
memset(&waitStatus, '\0', sizeof(waitStatus));
// Wait for child termination
retval = waitid(P_PID, pid, &waitStatus, WNOHANG | WEXITED);
if (retval < 0) {
char tmp[64];
error("ERROR: select(): %s", strerror_r(errno, tmp, sizeof(tmp)));
waitOver = true;
}
// These are the acceptable conditions under which child exit is
// regarded as successful
if (!retval && waitStatus.si_pid && waitStatus.si_pid == pid
&& (waitStatus.si_code == CLD_EXITED
|| waitStatus.si_code == CLD_KILLED)) {
debug("Child (%d) exited as expected\n", pid);
waitOver = true;
}
// Unsuccessful wait, avoid busy looping
if (!waitOver)
cCondWait::SleepMs(timeoutms);
} while (!waitOver);
pid = -1;
isActive = false;
}