From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: Add login_tty
Date: Sat, 20 Dec 2014 21:59:07 -0500 [thread overview]
Message-ID: <20141221025906.GJ4574@brightrain.aerifal.cx> (raw)
In-Reply-To: <20141221013858.GI4574@brightrain.aerifal.cx>
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On Sat, Dec 20, 2014 at 08:38:58PM -0500, Rich Felker wrote:
> I've got a draft based on these comments that I'll post soon for
> review.
Here's the draft. While I was at it I added protection against
cancellation. openpty should have this too but I'll do that
separately.
Rich
[-- Attachment #2: forkpty.c --]
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#include <pty.h>
#include <utmp.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <pthread.h>
int forkpty(int *pm, char *name, const struct termios *tio, const struct winsize *ws)
{
int m, s, ec=0, p[2], cs;
pid_t pid=-1;
sigset_t set, oldset;
if (openpty(&m, &s, name, tio, ws) < 0) return -1;
sigfillset(&set);
pthread_sigmask(SIG_BLOCK, &set, &oldset);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
if (pipe2(p, O_CLOEXEC)) {
close(s);
goto out;
}
pid = fork();
if (!pid) {
close(m);
close(p[0]);
if (login_tty(s)) {
write(p[1], &errno, sizeof errno);
_exit(127);
}
close(p[1]);
pthread_setcancelstate(cs, 0);
pthread_sigmask(SIG_SETMASK, &oldset, 0);
return 0;
}
close(s);
close(p[1]);
if (read(p[0], &ec, sizeof ec) > 0) {
int status;
waitpid(pid, &status, 0);
pid = -1;
errno = ec;
}
close(p[0]);
out:
if (pid > 0) *pm = m;
else close(m);
pthread_setcancelstate(cs, 0);
pthread_sigmask(SIG_SETMASK, &oldset, 0);
return pid;
}
prev parent reply other threads:[~2014-12-21 2:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-25 18:57 Felix Janda
2014-08-25 22:43 ` Rich Felker
2014-08-26 16:56 ` Felix Janda
2014-08-29 18:44 ` Felix Janda
2014-09-04 21:22 ` Szabolcs Nagy
2014-09-04 21:33 ` Rich Felker
2014-09-04 22:31 ` Justin Cormack
2014-09-05 17:23 ` Felix Janda
2014-09-05 17:29 ` Rich Felker
2014-09-05 18:52 ` Felix Janda
2014-10-31 16:19 ` Rich Felker
2014-11-01 21:15 ` Felix Janda
2014-11-01 21:45 ` Rich Felker
2014-11-01 22:07 ` Szabolcs Nagy
2014-11-01 22:27 ` Felix Janda
2014-11-01 22:43 ` Rich Felker
2014-11-01 22:56 ` Felix Janda
2014-11-02 0:09 ` Rich Felker
2014-11-02 14:19 ` Felix Janda
2014-11-02 16:28 ` Rich Felker
2014-11-02 18:56 ` Felix Janda
2014-11-02 22:28 ` Rich Felker
2014-11-03 18:29 ` Felix Janda
2014-12-21 0:58 ` Rich Felker
2014-12-21 1:15 ` Rich Felker
2014-12-21 1:38 ` Rich Felker
2014-12-21 2:59 ` Rich Felker [this message]
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