void
setjobctl(int on)
{
int fd;
int pgrp;
if (on == jobctl || rootshell == 0)
return;
if (on) {
int ofd;
ofd = fd = open(_PATH_TTY, O_RDWR);
if (fd < 0) {
fd += 3;
while (!isatty(fd) && --fd >= 0)
;
}
fd = fcntl(fd, F_DUPFD, 10);
close(ofd);
if (fd < 0)
goto out;
fcntl(fd, F_SETFD, FD_CLOEXEC);
do { /* while we are in the background */
if ((pgrp = tcgetpgrp(fd)) < 0) {
out:
sh_warnx("can't access tty; job control turned off");
mflag = on = 0;
goto close;
}
if (pgrp == getpgrp())
break;
killpg(0, SIGTTIN);
} while (1);
initialpgrp = pgrp;
setsignal(SIGTSTP);
setsignal(SIGTTOU);
setsignal(SIGTTIN);
pgrp = rootpid;
setpgid(0, pgrp);
xtcsetpgrp(fd, pgrp);
} else {
/* turning job control off */
fd = ttyfd;
pgrp = initialpgrp;
xtcsetpgrp(fd, pgrp);
setpgid(0, pgrp);
setsignal(SIGTSTP);
setsignal(SIGTTOU);
setsignal(SIGTTIN);
close:
close(fd);
fd = -1;
}
ttyfd = fd;
jobctl = on;
}
/*
* Find out what the current directory is. If we already know the current
* directory, this routine returns immediately.
*/
inline
STATIC char *
getpwd(void)
{
char *buf;
buf = malloc(PATH_MAX);
if (buf != NULL)
{
if(getcwd(buf, sizeof(buf)))
{
return buf;
}
else
{
free(buf);
}
}
sh_warnx("getcwd() failed: %s", strerror(errno));
return NULL;
}