spawn: Use special invocation for <spawn.h> on OS/2 kLIBC.
[gnulib.git] / tests / test-ftello4.c
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1 /* Test of ftello() function.
2 Copyright (C) 2011-2021 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 #include <config.h>
19 #include <stdio.h>
21 #include <errno.h>
22 #include <unistd.h>
24 #include "macros.h"
26 int
27 main (int argc, char **argv)
29 const char *filename = argv[1];
31 /* Test that ftello() sets errno if someone else closes the stream
32 fd behind the back of stdio. */
34 FILE *fp = fopen (filename, "r");
35 ASSERT (fp != NULL);
36 setvbuf (fp, NULL, _IONBF, 0);
37 ASSERT (close (fileno (fp)) == 0);
38 errno = 0;
39 ASSERT (ftello (fp) == (off_t)-1);
40 ASSERT (errno == EBADF);
41 fclose (fp);
44 /* Test that ftello() sets errno if the stream was constructed with
45 an invalid file descriptor. */
47 FILE *fp = fdopen (-1, "w");
48 if (fp != NULL)
50 errno = 0;
51 ASSERT (ftello (fp) == (off_t)-1);
52 ASSERT (errno == EBADF);
53 fclose (fp);
57 FILE *fp;
58 close (99);
59 fp = fdopen (99, "w");
60 if (fp != NULL)
62 errno = 0;
63 ASSERT (ftello (fp) == (off_t)-1);
64 ASSERT (errno == EBADF);
65 fclose (fp);
69 return 0;