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/* Test of creating a temporary file.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2022. */
#include <config.h>
#include "tempname.h"
#include <string.h>
#include <unistd.h>
#include "macros.h"
int
main ()
{
/* Verify that two consecutive calls to gen_tempname return two different
file names, with a high probability. */
const char *templ18 = "gl-temp-XXXXXX.xyz";
char filename1[18 + 1];
char filename2[18 + 1];
/* Case 1: The first file still exists while gen_tempname is called a second
time. */
{
strcpy (filename1, templ18);
int fd1 = gen_tempname (filename1, strlen (".xyz"), 0, GT_FILE);
ASSERT (fd1 >= 0);
strcpy (filename2, templ18);
int fd2 = gen_tempname (filename2, strlen (".xyz"), 0, GT_FILE);
ASSERT (fd2 >= 0);
/* gen_tempname arranges (via O_EXCL) to not return the name of an existing
file. */
ASSERT (strcmp (filename1, filename2) != 0);
/* Clean up. */
close (fd1);
close (fd2);
unlink (filename1);
unlink (filename2);
}
/* Case 2: The first file is deleted before gen_tempname is called a second
time. */
{
strcpy (filename1, templ18);
int fd1 = gen_tempname (filename1, strlen (".xyz"), 0, GT_FILE);
ASSERT (fd1 >= 0);
/* Clean up. */
close (fd1);
unlink (filename1);
strcpy (filename2, templ18);
int fd2 = gen_tempname (filename2, strlen (".xyz"), 0, GT_FILE);
ASSERT (fd2 >= 0);
/* With 6 'X' and a good pseudo-random number generator behind the scenes,
the probability of getting the same file name twice in a row should be
1/62^6 < 1/10^10.
But on 64-bit native Windows, this probability is ca. 0.1% to 0.3%. */
ASSERT (strcmp (filename1, filename2) != 0);
/* Clean up. */
close (fd2);
unlink (filename2);
}
return 0;
}
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