pty.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include "util.h"
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <fcntl.h>
   6 #include <stdlib.h>
   7 #if !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
   8 #include <pty.h>
   9 #endif
  10
  11 extern int ptm, pts;
  12
  13 void
  14 getpty(void) {
  15         char *ptsdev;
  16
  17 #if defined(_GNU_SOURCE)
  18         ptm = getpt();
  19 #elif _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
  20         ptm = posix_openpt(O_RDWR);
  21 #else
  22         ptm = open("/dev/ptmx", O_RDWR);
  23         if(ptm == -1)
  24                 if(openpty(&ptm, &pts, NULL, NULL, NULL) == -1)
  25                         eprintn("error, cannot open pty");
  26 #endif
  27 #if defined(_XOPEN_SOURCE)
  28         if(ptm != -1) {
  29                 if(grantpt(ptm) == -1)
  30                         eprintn("error, cannot grant access to pty");
  31                 if(unlockpt(ptm) == -1)
  32                         eprintn("error, cannot unlock pty");
  33                 ptsdev = ptsname(ptm);
  34                 if(!ptsdev)
  35                         eprintn("error, slave pty name undefined");
  36                 pts = open(ptsdev, O_RDWR);
  37                 if(pts == -1)
  38                         eprintn("error, cannot open slave pty");
  39         }
  40         else
  41                 eprintn("error, cannot open pty");
  42 #endif
  43 }