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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;
}
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