1 /* Test setvbuf on readonly fopen (using mmap stdio).
2 Copyright (C) 2002-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
27 char name
[] = "/tmp/tst-mmap-setvbuf.XXXXXX";
29 const char * const test
= "Let's see if mmap stdio works with setvbuf.\n";
30 char temp
[strlen (test
) + 1];
31 int fd
= mkstemp (name
);
36 printf ("%u: cannot open temporary file: %m\n", __LINE__
);
43 printf ("%u: cannot fdopen temporary file: %m\n", __LINE__
);
50 f
= fopen (name
, "rm");
53 printf ("%u: cannot fopen temporary file: %m\n", __LINE__
);
57 if (setvbuf (f
, buf
, _IOFBF
, sizeof buf
))
59 printf ("%u: setvbuf failed: %m\n", __LINE__
);
63 if (fread (temp
, 1, strlen (test
), f
) != strlen (test
))
65 printf ("%u: couldn't read the file back: %m\n", __LINE__
);
68 temp
[strlen (test
)] = '\0';
70 if (strcmp (test
, temp
))
72 printf ("%u: read different string than was written:\n%s%s",
73 __LINE__
, test
, temp
);