stdio-common/tst-popen.c

   1 /* Copyright (C) 2004-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <wchar.h>
  22
  23 static int
  24 do_test (void)
  25 {
  26   FILE *f = popen ("echo test", "r");
  27   int result = 0, ret;
  28   char *line = NULL;
  29   size_t len = 0;
  30
  31   if (f == NULL)
  32     {
  33       printf ("popen failed %m");
  34       return 1;
  35     }
  36
  37   /* POSIX says that pipe streams are byte-oriented.  */
  38   if (fwide (f, 0) >= 0)
  39     {
  40       puts ("popen did not return byte-oriented stream");
  41       result = 1;
  42     }
  43
  44   if (getline (&line, &len, f) != 5)
  45     {
  46       puts ("could not read line from popen");
  47       result = 1;
  48     }
  49   else if (strcmp (line, "test\n") != 0)
  50     {
  51       printf ("read \"%s\"\n", line);
  52       result = 1;
  53     }
  54
  55   if (getline (&line, &len, f) != -1)
  56     {
  57       puts ("second getline did not return -1");
  58       result = 1;
  59     }
  60
  61   ret = pclose (f);
  62   if (ret != 0)
  63     {
  64       printf ("pclose returned %d\n", ret);
  65       result = 1;
  66     }
  67
  68   return result;
  69 }
  70
  71 #define TEST_FUNCTION do_test ()
  72 #include "../test-skeleton.c"