| /* 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; |
| } |