1 /* Test of fwrite() function.
2 Copyright (C) 2011-2018 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, or (at your option)
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/>. */
21 #include "signature.h"
22 SIGNATURE_CHECK (fwrite
, size_t, (const void *, size_t, size_t, FILE *));
28 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
29 # include "msvc-inval.h"
35 main (int argc
, char **argv
)
37 const char *filename
= "test-fwrite.txt";
39 /* We don't have an fwrite() function that installs an invalid parameter
40 handler so far. So install that handler here, explicitly. */
41 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
42 && MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
43 gl_msvc_inval_ensure_handler ();
46 /* Test that fwrite() on an unbuffered stream sets errno if someone else
47 closes the stream fd behind the back of stdio. */
49 FILE *fp
= fopen (filename
, "w");
50 char buf
[5] = "world";
52 setvbuf (fp
, NULL
, _IONBF
, 0);
53 ASSERT (close (fileno (fp
)) == 0);
55 ASSERT (fwrite (buf
, 1, sizeof (buf
), fp
) == 0);
56 ASSERT (errno
== EBADF
);
61 /* Test that fwrite() on an unbuffered stream sets errno if the stream
62 was constructed with an invalid file descriptor. */
64 FILE *fp
= fdopen (-1, "w");
67 char buf
[5] = "world";
68 setvbuf (fp
, NULL
, _IONBF
, 0);
70 ASSERT (fwrite (buf
, 1, sizeof (buf
), fp
) == 0);
71 ASSERT (errno
== EBADF
);
79 fp
= fdopen (99, "w");
82 char buf
[5] = "world";
83 setvbuf (fp
, NULL
, _IONBF
, 0);
85 ASSERT (fwrite (buf
, 1, sizeof (buf
), fp
) == 0);
86 ASSERT (errno
== EBADF
);