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/* Test setvbuf on readonly fopen (using mmap stdio).
Copyright (C) 2002-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://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);
}
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