libc-top-half/musl/src/misc/pty.c

   1 #include <stdlib.h>
   2 #include <sys/ioctl.h>
   3 #include <stdio.h>
   4 #include <fcntl.h>
   5 #include <errno.h>
   6 #include "syscall.h"
   7
   8 int posix_openpt(int flags)
   9 {
  10         int r = open("/dev/ptmx", flags);
  11         if (r < 0 && errno == ENOSPC) errno = EAGAIN;
  12         return r;
  13 }
  14
  15 int grantpt(int fd)
  16 {
  17         return 0;
  18 }
  19
  20 int unlockpt(int fd)
  21 {
  22         int unlock = 0;
  23         return ioctl(fd, TIOCSPTLCK, &unlock);
  24 }
  25
  26 int __ptsname_r(int fd, char *buf, size_t len)
  27 {
  28         int pty, err;
  29         if (!buf) len = 0;
  30         if ((err = __syscall(SYS_ioctl, fd, TIOCGPTN, &pty))) return -err;
  31         if (snprintf(buf, len, "/dev/pts/%d", pty) >= len) return ERANGE;
  32         return 0;
  33 }
  34
  35 weak_alias(__ptsname_r, ptsname_r);