src/unistd/ctermid.c

   1 #include <stdio.h>
   2 #include <fcntl.h>
   3 #include <unistd.h>
   4 #include <limits.h>
   5 #include "syscall.h"
   6
   7 char *ctermid(char *s)
   8 {
   9         static char s2[L_ctermid];
  10         int fd;
  11         if (!s) s = s2;
  12         *s = 0;
  13         fd = open("/dev/tty", O_WRONLY | O_NOCTTY | O_CLOEXEC);
  14         if (fd >= 0) {
  15                 ttyname_r(fd, s, L_ctermid);
  16                 __syscall(SYS_close, fd);
  17         }
  18         return s;
  19 }