src/protocols/zephyr/ZGetWGPort.c

   1 /* This file is part of the Project Athena Zephyr Notification System.
   2  * It contains source for the ZGetWGPort function.
   3  *
   4  *      Created by:     Robert French
   5  *
   6  *      $Source$
   7  *      $Author: warmenhoven $
   8  *
   9  *      Copyright (c) 1987 by the Massachusetts Institute of Technology.
  10  *      For copying and distribution information, see the file
  11  *      "mit-copyright.h".
  12  */
  13 /* $Header$ */
  14
  15 #ifndef lint
  16 static char rcsid_ZGetWGPort_c[] = "$Header$";
  17 #endif
  18
  19 #include <internal.h>
  20
  21 int ZGetWGPort()
  22 {
  23     char *envptr, name[128];
  24     FILE *fp;
  25     int wgport;
  26
  27     envptr = getenv("WGFILE");
  28     if (!envptr) {
  29         (void) sprintf(name, "/tmp/wg.%d", getuid());
  30         envptr = name;
  31     }
  32     if (!(fp = fopen(envptr, "r")))
  33         return (-1);
  34
  35     /* if fscanf fails, return -1 via wgport */
  36     if (fscanf(fp, "%d", &wgport) != 1)
  37             wgport = -1;
  38
  39     (void) fclose(fp);
  40
  41     return (wgport);
  42 }