extern "C" int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
int retval = 0;
struct timespec sleepTime = {0, 1000};
siginfo_t siginfop;
memset(&siginfop, 0, sizeof(siginfop));
/* waitid returns 0 in case of success as well as when WNOHANG is specified
* and we need to distinguish those two cases.man page for waitid says:
* If WNOHANG was specified in options and there were no children in a
* waitable state, then waitid() returns 0 immediately and the state of
* the siginfo_t structure pointed to by infop is unspecified. To
* distinguish this case from that where a child was in a waitable state,
* zero out the si_pid field before the call and check for a nonzero value
* in this field after the call returns.
*
* See comments above wait4()
*/
while (retval == 0) {
DMTCP_PLUGIN_DISABLE_CKPT();
pid_t currPid = VIRTUAL_TO_REAL_PID (id);
retval = _real_waitid (idtype, currPid, &siginfop, options | WNOHANG);
if (retval != -1) {
pid_t virtualPid = REAL_TO_VIRTUAL_PID ( siginfop.si_pid );
siginfop.si_pid = virtualPid;
if ( siginfop.si_code == CLD_EXITED || siginfop.si_code == CLD_KILLED )
dmtcp::VirtualPidTable::instance().erase(virtualPid);
}
DMTCP_PLUGIN_ENABLE_CKPT();
if ((options & WNOHANG) ||
retval == -1 ||
siginfop.si_pid != 0) {
break;
} else {
if (sleepTime.tv_sec == 0) {
sleepTime.tv_nsec *= 2;
if (sleepTime.tv_nsec >= 1000 * 1000 * 1000) {
sleepTime.tv_sec++;
sleepTime.tv_nsec = 0;
}
}
nanosleep(&sleepTime, NULL);
}
}
if (retval == 0 && infop != NULL) {
*infop = siginfop;
}
return retval;
}
extern "C" int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
siginfo_t siginfop;
memset(&siginfop, 0, sizeof(siginfop));
int retval = _real_waitid (idtype, id, &siginfop, options);
if (retval != -1) {
if ( siginfop.si_code == CLD_EXITED || siginfop.si_code == CLD_KILLED )
dmtcp::ProcessInfo::instance().eraseChild ( siginfop.si_pid );
}
if (retval == 0 && infop != NULL) {
*infop = siginfop;
}
return retval;
}
