| 1 | /* Test of perror() function.
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| 2 | Copyright (C) 2011-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software; you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 3, or (at your option)
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| 7 | any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | #include <config.h>
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| 18 |
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| 19 | #include <stdio.h>
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| 20 |
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| 21 | #include <errno.h>
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| 22 | #include <string.h>
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| 23 | #include <unistd.h>
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| 24 |
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| 25 | /* This test intentionally parses stderr. So, we arrange to have fd 10
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| 26 | (outside the range of interesting fd's during the test) set up to
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| 27 | duplicate the original stderr. */
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| 28 | #define BACKUP_STDERR_FILENO 10
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| 29 | #define ASSERT_STREAM myerr
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| 30 | #include "macros.h"
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| 31 |
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| 32 | static FILE *myerr;
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| 33 |
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| 34 | #define BASE "test-perror2"
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| 35 |
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| 36 | int
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| 37 | main (void)
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| 38 | {
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| 39 | /* We change fd 2 later, so save it in fd 10. */
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| 40 | if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
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| 41 | || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
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| 42 | return 2;
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| 43 |
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| 44 | ASSERT (freopen (BASE ".tmp", "w+", stderr) == stderr);
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| 45 |
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| 46 | /* Test that perror does not clobber strerror buffer. */
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| 47 | {
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| 48 | const char *msg1;
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| 49 | const char *msg2;
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| 50 | const char *msg3;
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| 51 | const char *msg4;
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| 52 | char *str1;
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| 53 | char *str2;
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| 54 | char *str3;
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| 55 | char *str4;
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| 56 |
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| 57 | msg1 = strerror (ENOENT);
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| 58 | ASSERT (msg1);
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| 59 | str1 = strdup (msg1);
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| 60 | ASSERT (str1);
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| 61 |
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| 62 | msg2 = strerror (ERANGE);
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| 63 | ASSERT (msg2);
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| 64 | str2 = strdup (msg2);
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| 65 | ASSERT (str2);
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| 66 |
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| 67 | msg3 = strerror (-4);
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| 68 | ASSERT (msg3);
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| 69 | str3 = strdup (msg3);
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| 70 | ASSERT (str3);
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| 71 |
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| 72 | msg4 = strerror (1729576);
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| 73 | ASSERT (msg4);
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| 74 | str4 = strdup (msg4);
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| 75 | ASSERT (str4);
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| 76 |
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| 77 | errno = EACCES;
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| 78 | perror ("");
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| 79 | errno = -5;
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| 80 | perror ("");
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| 81 | ASSERT (!ferror (stderr));
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| 82 | ASSERT (STREQ (msg4, str4));
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| 83 |
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| 84 | free (str1);
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| 85 | free (str2);
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| 86 | free (str3);
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| 87 | free (str4);
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| 88 | }
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| 89 |
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| 90 | /* Test that perror uses the same message as strerror. */
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| 91 | {
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| 92 | int errs[] = { EACCES, 0, -3, };
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| 93 | int i;
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| 94 | for (i = 0; i < SIZEOF (errs); i++)
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| 95 | {
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| 96 | char buf[256];
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| 97 | const char *err = strerror (errs[i]);
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| 98 |
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| 99 | ASSERT (err);
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| 100 | ASSERT (strlen (err) < sizeof buf);
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| 101 | rewind (stderr);
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| 102 | ASSERT (ftruncate (fileno (stderr), 0) == 0);
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| 103 | errno = errs[i];
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| 104 | perror (NULL);
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| 105 | ASSERT (!ferror (stderr));
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| 106 | rewind (stderr);
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| 107 | ASSERT (fgets (buf, sizeof buf, stderr) == buf);
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| 108 | ASSERT (strstr (buf, err));
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| 109 | }
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| 110 | }
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| 111 |
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| 112 | /* Test that perror reports write failure. */
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| 113 | {
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| 114 | ASSERT (freopen (BASE ".tmp", "r", stderr) == stderr);
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| 115 | ASSERT (setvbuf (stderr, NULL, _IONBF, BUFSIZ) == 0);
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| 116 | errno = -1;
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| 117 | ASSERT (!ferror (stderr));
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| 118 | perror (NULL);
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| 119 | #if 0
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| 120 | /* Commented out until cygwin behaves:
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| 121 | https://sourceware.org/ml/newlib/2011/msg00228.html */
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| 122 | ASSERT (errno > 0);
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| 123 | /* Commented out until glibc behaves:
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| 124 | https://sourceware.org/bugzilla/show_bug.cgi?id=12792 */
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| 125 | ASSERT (ferror (stderr));
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| 126 | #endif
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| 127 | }
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| 128 |
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| 129 | ASSERT (fclose (stderr) == 0);
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| 130 | ASSERT (remove (BASE ".tmp") == 0);
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| 131 |
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| 132 | return 0;
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| 133 | }
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