pty.c

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