source: asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/misc/openpty.c@ 337

#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <pty.h>
#include <stdio.h>
#include <pthread.h>

/* Nonstandard, but vastly superior to the standard functions */

int openpty(int *pm, int *ps, char *name, const struct termios *tio, const struct winsize *ws)
{
        int m, s, n=0, cs;
        char buf[20];

        m = open("/dev/ptmx", O_RDWR|O_NOCTTY);
        if (m < 0) return -1;

        pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);

        if (ioctl(m, TIOCSPTLCK, &n) || ioctl (m, TIOCGPTN, &n))
                goto fail;

        if (!name) name = buf;
        snprintf(name, sizeof buf, "/dev/pts/%d", n);
        if ((s = open(name, O_RDWR|O_NOCTTY)) < 0)
                goto fail;

        if (tio) tcsetattr(s, TCSANOW, tio);
        if (ws) ioctl(s, TIOCSWINSZ, ws);

        *pm = m;
        *ps = s;

        pthread_setcancelstate(cs, 0);
        return 0;
fail:
        close(m);
        pthread_setcancelstate(cs, 0);
        return -1;
}