/*
* Mark a command as don't care.
*/
void
free_command(int pid)
{
register struct child* cp = findchild(pid);
if (cp->done)
delchild(cp);
else
cp->free = 1;
}
/*
* Wait for a specific child to die.
*/
int
wait_command(int pid)
{
register struct child* cp = findchild(pid);
int status = -1;
holdsigs();
while (waitpid(pid, &status, 0) == -1 && errno == EINTR);
relsesigs();
delchild(cp);
return status;
}
/*
* Mark a child as don't care.
*/
void
free_child(int pid)
{
sigset_t nset, oset;
struct child *cp = findchild(pid);
(void)sigemptyset(&nset);
(void)sigaddset(&nset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nset, &oset);
if (cp->done)
delchild(cp);
else
cp->free = 1;
(void)sigprocmask(SIG_SETMASK, &oset, NULL);
}
/*ARGSUSED*/
void
sigchild(int signo __unused)
{
int pid;
int status;
struct child *cp;
while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
cp = findchild(pid);
if (cp->free)
delchild(cp);
else {
cp->done = 1;
cp->status = status;
}
}
}
/*
* Wait for a specific child to die.
*/
int
wait_child(int pid)
{
sigset_t nset, oset;
struct child *cp = findchild(pid);
sigemptyset(&nset);
sigaddset(&nset, SIGCHLD);
sigprocmask(SIG_BLOCK, &nset, &oset);
while (!cp->done)
(void)sigsuspend(&oset);
wait_status = cp->status;
delchild(cp);
sigprocmask(SIG_SETMASK, &oset, NULL);
return ((WIFEXITED(wait_status) && WEXITSTATUS(wait_status)) ? -1 : 0);
}
