pty.c

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