tests/test-gethostname.c

   1 /*
   2  * Copyright (C) 2008-2024 Free Software Foundation, Inc.
   3  * Written by Simon Josefsson.
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Get gethostname() declaration.  */
  21 #include <unistd.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (gethostname, int, (char *, size_t));
  25
  26 /* Get HOST_NAME_MAX definition.  */
  27 #include <limits.h>
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <errno.h>
  32
  33 #define NOHOSTNAME "magic-gnulib-test-string"
  34
  35 int
  36 main (int argc, _GL_UNUSED char *argv[])
  37 {
  38   char buf[HOST_NAME_MAX];
  39   int rc;
  40
  41   if (strlen (NOHOSTNAME) >= HOST_NAME_MAX)
  42     {
  43       printf ("HOST_NAME_MAX impossibly small?! %d\n", HOST_NAME_MAX);
  44       return 2;
  45     }
  46
  47   strcpy (buf, NOHOSTNAME);
  48
  49   rc = gethostname (buf, sizeof (buf));
  50
  51   if (rc != 0)
  52     {
  53       printf ("gethostname failed, rc %d errno %d\n", rc, errno);
  54       return 1;
  55     }
  56
  57   if (strcmp (buf, NOHOSTNAME) == 0)
  58     {
  59       printf ("gethostname left buffer untouched.\n");
  60       return 1;
  61     }
  62
  63   if (argc > 1)
  64     printf ("hostname: %s\n", buf);
  65
  66   return 0;
  67 }