stdio-common/tst-popen.c

   1 /* Copyright (C) 2004-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <wchar.h>
  21
  22 static int
  23 do_test (void)
  24 {
  25   FILE *f = popen ("echo test", "r");
  26   int result = 0, ret;
  27   char *line = NULL;
  28   size_t len = 0;
  29
  30   if (f == NULL)
  31     {
  32       printf ("popen failed %m");
  33       return 1;
  34     }
  35
  36   /* POSIX says that pipe streams are byte-oriented.  */
  37   if (fwide (f, 0) >= 0)
  38     {
  39       puts ("popen did not return byte-oriented stream");
  40       result = 1;
  41     }
  42
  43   if (getline (&line, &len, f) != 5)
  44     {
  45       puts ("could not read line from popen");
  46       result = 1;
  47     }
  48   else if (strcmp (line, "test\n") != 0)
  49     {
  50       printf ("read \"%s\"\n", line);
  51       result = 1;
  52     }
  53
  54   if (getline (&line, &len, f) != -1)
  55     {
  56       puts ("second getline did not return -1");
  57       result = 1;
  58     }
  59
  60   ret = pclose (f);
  61   if (ret != 0)
  62     {
  63       printf ("pclose returned %d\n", ret);
  64       result = 1;
  65     }
  66
  67   return result;
  68 }
  69
  70 #define TEST_FUNCTION do_test ()
  71 #include "../test-skeleton.c"