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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/* Test setvbuf on readonly fopen (using mmap stdio).
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Copyright (C) 2002-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int main (void)
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{
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char name[] = "/tmp/tst-mmap-setvbuf.XXXXXX";
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char buf[4096];
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const char * const test = "Let's see if mmap stdio works with setvbuf.\n";
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char temp[strlen (test) + 1];
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int fd = mkstemp (name);
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FILE *f;
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if (fd == -1)
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{
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printf ("%u: cannot open temporary file: %m\n", __LINE__);
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exit (1);
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}
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f = fdopen (fd, "w");
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if (f == NULL)
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{
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printf ("%u: cannot fdopen temporary file: %m\n", __LINE__);
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exit (1);
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}
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fputs (test, f);
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fclose (f);
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f = fopen (name, "rm");
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if (f == NULL)
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{
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printf ("%u: cannot fopen temporary file: %m\n", __LINE__);
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exit (1);
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}
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if (setvbuf (f, buf, _IOFBF, sizeof buf))
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{
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printf ("%u: setvbuf failed: %m\n", __LINE__);
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exit (1);
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}
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if (fread (temp, 1, strlen (test), f) != strlen (test))
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{
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printf ("%u: couldn't read the file back: %m\n", __LINE__);
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exit (1);
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}
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temp [strlen (test)] = '\0';
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if (strcmp (test, temp))
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{
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printf ("%u: read different string than was written:\n%s%s",
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__LINE__, test, temp);
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exit (1);
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}
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fclose (f);
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unlink (name);
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exit (0);
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}
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