static RETSIGTYPE
usr1handler (int sig)
{
donep = 1;
SIGRETURN(0);
}
static RETSIGTYPE
sigchld(int sig)
{
int status;
waitpid(-1, &status, 0);
SIGRETURN(0);
}
static RETSIGTYPE
usr2handler (int sig)
{
donep = 1;
if (nchild == 0)
exit (0);
SIGRETURN(0);
}
static RETSIGTYPE
catchSIGHUP(int sig)
{
hangup = TRUE ;
/* This should not be a problem on BSD systems */
signal(SIGHUP, catchSIGHUP);
signal(SIGPIPE, catchSIGHUP);
SIGRETURN(0);
}
static RETSIGTYPE
sigchld(int sig)
{
int status;
/*
* waitpid() is async safe. will return -1 or 0 on no more zombie
* children
*/
while ((waitpid(-1, &status, WNOHANG)) > 0)
;
SIGRETURN(0);
}
static RETSIGTYPE
childhandler (int sig)
{
pid_t pid;
int status;
do {
pid = waitpid (-1, &status, WNOHANG|WUNTRACED);
if (pid > 0 && (WIFEXITED(status) || WIFSIGNALED(status)))
if (--nchild == 0 && donep)
exit (0);
} while(pid > 0);
signal (SIGCHLD, childhandler);
SIGRETURN(0);
}
static RETSIGTYPE
terminate(int sig)
{
if(getpid() == pgrp) {
/* parent */
term_flag = 1;
signal(sig, SIG_IGN);
killpg(pgrp, sig);
} else {
/* child */
if(doing_useful_work)
term_flag = 1;
else
exit(0);
}
SIGRETURN(0);
}
int main(void)
{
SIGRETURN (*old)();
old = signal(SIGQUIT, SIG_DFL);
return 0;
}
static RETSIGTYPE
sigtimeout(int sig)
{
sig_alarm = 1;
SIGRETURN(0);
}