lib/other/ctermid.c

   1 /*  ctermid(3)
   2  *
   3  *  Author: Terrence Holm          Aug. 1988
   4  *
   5  *
   6  *  Ctermid(3) returns a pointer to a string naming the controlling
   7  *  terminal. If <name_space> is NULL then local PRIVATE storage
   8  *  is used, otherwise <name_space> must point to storage of at
   9  *  least L_ctermid characters.
  10  *
  11  *  Returns a pointer to "/dev/tty".
  12  */
  13
  14 #include <lib.h>
  15 #include <string.h>
  16 #include <stdio.h>
  17
  18 _PROTOTYPE( char *ctermid, (char *name_space));
  19
  20 #ifndef L_ctermid
  21 #define L_ctermid  9
  22 #endif
  23
  24 char *ctermid(name_space)
  25 char *name_space;
  26 {
  27   PRIVATE char termid[L_ctermid];
  28
  29   if (name_space == (char *)NULL) name_space = termid;
  30   strcpy(name_space, "/dev/tty");
  31   return(name_space);
  32 }