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glibc/libio/tst-mmap-setvbuf.c
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/* Test setvbuf on readonly fopen (using mmap stdio). | |
Copyright (C) 2002-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Jakub Jelinek <jakub@redhat.com>, 2002. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
int main (void) | |
{ | |
char name[] = "/tmp/tst-mmap-setvbuf.XXXXXX"; | |
char buf[4096]; | |
const char * const test = "Let's see if mmap stdio works with setvbuf.\n"; | |
char temp[strlen (test) + 1]; | |
int fd = mkstemp (name); | |
FILE *f; | |
if (fd == -1) | |
{ | |
printf ("%u: cannot open temporary file: %m\n", __LINE__); | |
exit (1); | |
} | |
f = fdopen (fd, "w"); | |
if (f == NULL) | |
{ | |
printf ("%u: cannot fdopen temporary file: %m\n", __LINE__); | |
exit (1); | |
} | |
fputs (test, f); | |
fclose (f); | |
f = fopen (name, "rm"); | |
if (f == NULL) | |
{ | |
printf ("%u: cannot fopen temporary file: %m\n", __LINE__); | |
exit (1); | |
} | |
if (setvbuf (f, buf, _IOFBF, sizeof buf)) | |
{ | |
printf ("%u: setvbuf failed: %m\n", __LINE__); | |
exit (1); | |
} | |
if (fread (temp, 1, strlen (test), f) != strlen (test)) | |
{ | |
printf ("%u: couldn't read the file back: %m\n", __LINE__); | |
exit (1); | |
} | |
temp [strlen (test)] = '\0'; | |
if (strcmp (test, temp)) | |
{ | |
printf ("%u: read different string than was written:\n%s%s", | |
__LINE__, test, temp); | |
exit (1); | |
} | |
fclose (f); | |
unlink (name); | |
exit (0); | |
} |