116 lines
1.9 KiB
C
116 lines
1.9 KiB
C
#include "threadimpl.h"
|
|
|
|
#undef waitpid
|
|
#undef pipe
|
|
#undef wait
|
|
|
|
static int sigpid;
|
|
static int threadpassfd;
|
|
|
|
static void
|
|
child(void)
|
|
{
|
|
int status, pid;
|
|
|
|
notedisable("sys: child");
|
|
pid = waitpid(sigpid, &status, 0);
|
|
if(pid < 0){
|
|
fprint(2, "%s: wait: %r\n", argv0);
|
|
_exit(97);
|
|
}
|
|
if(WIFEXITED(status))
|
|
_exit(WEXITSTATUS(status));
|
|
if(WIFSIGNALED(status)){
|
|
signal(WTERMSIG(status), SIG_DFL);
|
|
raise(WTERMSIG(status));
|
|
_exit(98); /* not reached */
|
|
}
|
|
fprint(2, "%s: wait pid %d status 0x%ux\n", pid, status);
|
|
_exit(99);
|
|
}
|
|
|
|
static void
|
|
sigpass(int sig)
|
|
{
|
|
if(sig == SIGCHLD)
|
|
child();
|
|
else
|
|
kill(sigpid, sig);
|
|
}
|
|
|
|
void
|
|
_threadsetupdaemonize(void)
|
|
{
|
|
int i, n, pid;
|
|
int p[2];
|
|
char buf[20];
|
|
|
|
sigpid = 1;
|
|
|
|
threadlinklibrary();
|
|
|
|
if(pipe(p) < 0)
|
|
sysfatal("passer pipe: %r");
|
|
|
|
/* hide these somewhere they won't cause harm */
|
|
if(dup(p[0], 98) < 0 || dup(p[1], 99) < 0)
|
|
sysfatal("passer pipe dup: %r");
|
|
close(p[0]);
|
|
close(p[1]);
|
|
p[0] = 98;
|
|
p[1] = 99;
|
|
|
|
/* close on exec */
|
|
if(fcntl(p[0], F_SETFD, 1) < 0 || fcntl(p[1], F_SETFD, 1) < 0)
|
|
sysfatal("passer pipe pipe fcntl: %r");
|
|
|
|
noteenable("sys: child");
|
|
signal(SIGCHLD, sigpass);
|
|
switch(pid = fork()){
|
|
case -1:
|
|
sysfatal("passer fork: %r");
|
|
default:
|
|
close(p[1]);
|
|
break;
|
|
case 0:
|
|
for(i=0; i<100; i++) sched_yield();
|
|
notedisable("sys: child");
|
|
signal(SIGCHLD, SIG_DFL);
|
|
rfork(RFNOTEG);
|
|
close(p[0]);
|
|
threadpassfd = p[1];
|
|
return;
|
|
}
|
|
|
|
sigpid = pid;
|
|
for(i=0; i<NSIG; i++){
|
|
struct sigaction sa;
|
|
|
|
memset(&sa, 0, sizeof sa);
|
|
sa.sa_handler = sigpass;
|
|
sa.sa_flags |= SA_RESTART;
|
|
sigaction(i, &sa, nil);
|
|
}
|
|
|
|
for(;;){
|
|
n = read(p[0], buf, sizeof buf-1);
|
|
if(n == 0){ /* program exited */
|
|
child();
|
|
}
|
|
if(n > 0)
|
|
break;
|
|
print("passer read: %r\n");
|
|
}
|
|
buf[n] = 0;
|
|
_exit(atoi(buf));
|
|
}
|
|
|
|
void
|
|
_threaddaemonize(void)
|
|
{
|
|
if(threadpassfd >= 0){
|
|
write(threadpassfd, "0", 1);
|
|
close(threadpassfd);
|
|
threadpassfd = -1;
|
|
}
|
|
}
|