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/*
* pidwait.c -- wait for child to exit
*
* $Id: pidwait.c,v 1.6 2008/04/11 14:12:55 opk Exp $
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <h/mh.h>
#include <h/signals.h>
#include <errno.h>
#include <signal.h>
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
int
pidwait (pid_t id, int sigsok)
{
pid_t pid;
SIGNAL_HANDLER istat, qstat;
#ifdef HAVE_UNION_WAIT
union wait status;
#else
int status;
#endif
if (sigsok == -1) {
/* ignore a couple of signals */
istat = SIGNAL (SIGINT, SIG_IGN);
qstat = SIGNAL (SIGQUIT, SIG_IGN);
}
#ifdef HAVE_WAITPID
while ((pid = waitpid(id, &status, 0)) == -1 && errno == EINTR)
;
#else
while ((pid = wait(&status)) != -1 && pid != id)
continue;
#endif
if (sigsok == -1) {
/* reset the signal handlers */
SIGNAL (SIGINT, istat);
SIGNAL (SIGQUIT, qstat);
}
#ifdef HAVE_UNION_WAIT
return (pid == -1 ? -1 : status.w_status);
#else
return (pid == -1 ? -1 : status);
#endif
}
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