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/* Test of perror() function.
Copyright (C) 2011-2020 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, 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/>. */
#include <config.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
/* This test intentionally parses stderr. So, we arrange to have fd 10
(outside the range of interesting fd's during the test) set up to
duplicate the original stderr. */
#define BACKUP_STDERR_FILENO 10
#define ASSERT_STREAM myerr
#include "macros.h"
static FILE *myerr;
#define BASE "test-perror2"
int
main (void)
{
/* We change fd 2 later, so save it in fd 10. */
if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
|| (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
return 2;
ASSERT (freopen (BASE ".tmp", "w+", stderr) == stderr);
/* Test that perror does not clobber strerror buffer. */
{
const char *msg1;
const char *msg2;
const char *msg3;
const char *msg4;
char *str1;
char *str2;
char *str3;
char *str4;
msg1 = strerror (ENOENT);
ASSERT (msg1);
str1 = strdup (msg1);
ASSERT (str1);
msg2 = strerror (ERANGE);
ASSERT (msg2);
str2 = strdup (msg2);
ASSERT (str2);
msg3 = strerror (-4);
ASSERT (msg3);
str3 = strdup (msg3);
ASSERT (str3);
msg4 = strerror (1729576);
ASSERT (msg4);
str4 = strdup (msg4);
ASSERT (str4);
errno = EACCES;
perror ("");
errno = -5;
perror ("");
ASSERT (!ferror (stderr));
ASSERT (msg1 == msg2 || msg1 == msg4 || STREQ (msg1, str1));
ASSERT (msg2 == msg4 || STREQ (msg2, str2));
ASSERT (msg3 == msg4 || STREQ (msg3, str3));
ASSERT (STREQ (msg4, str4));
free (str1);
free (str2);
free (str3);
free (str4);
}
/* Test that perror uses the same message as strerror. */
{
int errs[] = { EACCES, 0, -3, };
int i;
for (i = 0; i < SIZEOF (errs); i++)
{
char buf[256];
char *err = strerror (errs[i]);
ASSERT (err);
ASSERT (strlen (err) < sizeof buf);
rewind (stderr);
ASSERT (ftruncate (fileno (stderr), 0) == 0);
errno = errs[i];
perror (NULL);
ASSERT (!ferror (stderr));
rewind (stderr);
ASSERT (fgets (buf, sizeof buf, stderr) == buf);
ASSERT (strstr (buf, err));
}
}
/* Test that perror reports write failure. */
{
ASSERT (freopen (BASE ".tmp", "r", stderr) == stderr);
ASSERT (setvbuf (stderr, NULL, _IONBF, BUFSIZ) == 0);
errno = -1;
ASSERT (!ferror (stderr));
perror (NULL);
#if 0
/* Commented out until cygwin behaves:
https://sourceware.org/ml/newlib/2011/msg00228.html */
ASSERT (errno > 0);
/* Commented out until glibc behaves:
https://sourceware.org/bugzilla/show_bug.cgi?id=12792 */
ASSERT (ferror (stderr));
#endif
}
ASSERT (fclose (stderr) == 0);
ASSERT (remove (BASE ".tmp") == 0);
return 0;
}
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