| 1 | /* strerror_r.c --- POSIX compatible system error routine
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| 2 |
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| 3 | Copyright (C) 2010-2021 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU Lesser General Public License as
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| 7 | published by the Free Software Foundation; either version 2.1 of the
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| 8 | License, or (at your option) any later version.
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| 9 |
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| 10 | This file is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU Lesser General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Lesser General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | /* Written by Bruno Haible <bruno@clisp.org>, 2010. */
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| 19 |
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| 20 | #include <config.h>
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| 21 |
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| 22 | /* Enable declaration of sys_nerr and sys_errlist in <errno.h> on NetBSD. */
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| 23 | #define _NETBSD_SOURCE 1
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| 24 |
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| 25 | /* Specification. */
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| 26 | #include <string.h>
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| 27 |
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| 28 | #include <errno.h>
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| 29 | #include <stdio.h>
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| 30 | #include <stdlib.h>
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| 31 | #if !HAVE_SNPRINTF
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| 32 | # include <stdarg.h>
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| 33 | #endif
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| 34 |
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| 35 | #include "strerror-override.h"
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| 36 |
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| 37 | #if (__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__) && HAVE___XPG_STRERROR_R /* glibc >= 2.3.4, cygwin >= 1.7.9 */
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| 38 |
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| 39 | # define USE_XPG_STRERROR_R 1
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| 40 | extern
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| 41 | #ifdef __cplusplus
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| 42 | "C"
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| 43 | #endif
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| 44 | int __xpg_strerror_r (int errnum, char *buf, size_t buflen);
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| 45 |
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| 46 | #elif HAVE_DECL_STRERROR_R && !(__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__)
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| 47 |
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| 48 | /* The system's strerror_r function is OK, except that its third argument
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| 49 | is 'int', not 'size_t', or its return type is wrong. */
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| 50 |
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| 51 | # include <limits.h>
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| 52 |
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| 53 | # define USE_SYSTEM_STRERROR_R 1
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| 54 |
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| 55 | #else /* (__GLIBC__ >= 2 || defined __UCLIBC__ || defined __CYGWIN__ ? !HAVE___XPG_STRERROR_R : !HAVE_DECL_STRERROR_R) */
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| 56 |
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| 57 | /* Use the system's strerror(). Exclude glibc and cygwin because the
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| 58 | system strerror_r has the wrong return type, and cygwin 1.7.9
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| 59 | strerror_r clobbers strerror. */
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| 60 | # undef strerror
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| 61 |
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| 62 | # define USE_SYSTEM_STRERROR 1
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| 63 |
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| 64 | # if defined __NetBSD__ || defined __hpux || (defined _WIN32 && !defined __CYGWIN__) || defined __sgi || (defined __sun && !defined _LP64) || defined __CYGWIN__
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| 65 |
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| 66 | /* No locking needed. */
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| 67 |
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| 68 | /* Get catgets internationalization functions. */
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| 69 | # if HAVE_CATGETS
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| 70 | # include <nl_types.h>
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| 71 | # endif
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| 72 |
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| 73 | #ifdef __cplusplus
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| 74 | extern "C" {
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| 75 | #endif
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| 76 |
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| 77 | /* Get sys_nerr, sys_errlist on HP-UX (otherwise only declared in C++ mode).
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| 78 | Get sys_nerr, sys_errlist on IRIX (otherwise only declared with _SGIAPI). */
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| 79 | # if defined __hpux || defined __sgi
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| 80 | extern int sys_nerr;
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| 81 | extern char *sys_errlist[];
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| 82 | # endif
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| 83 |
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| 84 | /* Get sys_nerr on Solaris. */
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| 85 | # if defined __sun && !defined _LP64
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| 86 | extern int sys_nerr;
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| 87 | # endif
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| 88 |
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| 89 | #ifdef __cplusplus
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| 90 | }
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| 91 | #endif
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| 92 |
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| 93 | # else
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| 94 |
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| 95 | # include "glthread/lock.h"
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| 96 |
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| 97 | /* This lock protects the buffer returned by strerror(). We assume that
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| 98 | no other uses of strerror() exist in the program. */
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| 99 | gl_lock_define_initialized(static, strerror_lock)
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| 100 |
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| 101 | # endif
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| 102 |
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| 103 | #endif
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| 104 |
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| 105 | /* On MSVC, there is no snprintf() function, just a _snprintf().
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| 106 | It is of lower quality, but sufficient for the simple use here.
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| 107 | We only have to make sure to NUL terminate the result (_snprintf
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| 108 | does not NUL terminate, like strncpy). */
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| 109 | #if !HAVE_SNPRINTF
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| 110 | static int
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| 111 | local_snprintf (char *buf, size_t buflen, const char *format, ...)
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| 112 | {
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| 113 | va_list args;
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| 114 | int result;
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| 115 |
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| 116 | va_start (args, format);
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| 117 | result = _vsnprintf (buf, buflen, format, args);
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| 118 | va_end (args);
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| 119 | if (buflen > 0 && (result < 0 || result >= buflen))
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| 120 | buf[buflen - 1] = '\0';
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| 121 | return result;
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| 122 | }
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| 123 | # undef snprintf
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| 124 | # define snprintf local_snprintf
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| 125 | #endif
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| 126 |
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| 127 | /* Copy as much of MSG into BUF as possible, without corrupting errno.
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| 128 | Return 0 if MSG fit in BUFLEN, otherwise return ERANGE. */
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| 129 | static int
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| 130 | safe_copy (char *buf, size_t buflen, const char *msg)
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| 131 | {
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| 132 | size_t len = strlen (msg);
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| 133 | size_t moved = len < buflen ? len : buflen - 1;
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| 134 |
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| 135 | /* Although POSIX lets memmove corrupt errno, we don't
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| 136 | know of any implementation where this is a real problem. */
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| 137 | memmove (buf, msg, moved);
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| 138 | buf[moved] = '\0';
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| 139 | return len < buflen ? 0 : ERANGE;
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| 140 | }
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| 141 |
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| 142 |
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| 143 | int
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| 144 | strerror_r (int errnum, char *buf, size_t buflen)
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| 145 | #undef strerror_r
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| 146 | {
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| 147 | /* Filter this out now, so that rest of this replacement knows that
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| 148 | there is room for a non-empty message and trailing NUL. */
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| 149 | if (buflen <= 1)
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| 150 | {
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| 151 | if (buflen)
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| 152 | *buf = '\0';
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| 153 | return ERANGE;
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| 154 | }
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| 155 | *buf = '\0';
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| 156 |
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| 157 | /* Check for gnulib overrides. */
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| 158 | {
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| 159 | char const *msg = strerror_override (errnum);
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| 160 |
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| 161 | if (msg)
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| 162 | return safe_copy (buf, buflen, msg);
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| 163 | }
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| 164 |
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| 165 | {
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| 166 | int ret;
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| 167 | int saved_errno = errno;
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| 168 |
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| 169 | #if USE_XPG_STRERROR_R
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| 170 |
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| 171 | {
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| 172 | ret = __xpg_strerror_r (errnum, buf, buflen);
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| 173 | if (ret < 0)
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| 174 | ret = errno;
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| 175 | if (!*buf)
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| 176 | {
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| 177 | /* glibc 2.13 would not touch buf on err, so we have to fall
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| 178 | back to GNU strerror_r which always returns a thread-safe
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| 179 | untruncated string to (partially) copy into our buf. */
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| 180 | safe_copy (buf, buflen, strerror_r (errnum, buf, buflen));
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| 181 | }
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| 182 | }
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| 183 |
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| 184 | #elif USE_SYSTEM_STRERROR_R
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| 185 |
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| 186 | if (buflen > INT_MAX)
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| 187 | buflen = INT_MAX;
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| 188 |
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| 189 | # ifdef __hpux
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| 190 | /* On HP-UX 11.31, strerror_r always fails when buflen < 80; it
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| 191 | also fails to change buf on EINVAL. */
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| 192 | {
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| 193 | char stackbuf[80];
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| 194 |
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| 195 | if (buflen < sizeof stackbuf)
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| 196 | {
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| 197 | ret = strerror_r (errnum, stackbuf, sizeof stackbuf);
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| 198 | if (ret == 0)
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| 199 | ret = safe_copy (buf, buflen, stackbuf);
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| 200 | }
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| 201 | else
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| 202 | ret = strerror_r (errnum, buf, buflen);
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| 203 | }
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| 204 | # else
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| 205 | ret = strerror_r (errnum, buf, buflen);
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| 206 |
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| 207 | /* Some old implementations may return (-1, EINVAL) instead of EINVAL.
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| 208 | But on Haiku, valid error numbers are negative. */
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| 209 | # if !defined __HAIKU__
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| 210 | if (ret < 0)
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| 211 | ret = errno;
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| 212 | # endif
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| 213 | # endif
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| 214 |
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| 215 | # if defined _AIX || defined __HAIKU__
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| 216 | /* AIX and Haiku return 0 rather than ERANGE when truncating strings; try
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| 217 | again until we are sure we got the entire string. */
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| 218 | if (!ret && strlen (buf) == buflen - 1)
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| 219 | {
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| 220 | char stackbuf[STACKBUF_LEN];
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| 221 | size_t len;
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| 222 | strerror_r (errnum, stackbuf, sizeof stackbuf);
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| 223 | len = strlen (stackbuf);
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| 224 | /* STACKBUF_LEN should have been large enough. */
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| 225 | if (len + 1 == sizeof stackbuf)
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| 226 | abort ();
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| 227 | if (buflen <= len)
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| 228 | ret = ERANGE;
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| 229 | }
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| 230 | # else
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| 231 | /* Solaris 10 does not populate buf on ERANGE. OpenBSD 4.7
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| 232 | truncates early on ERANGE rather than return a partial integer.
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| 233 | We prefer the maximal string. We set buf[0] earlier, and we
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| 234 | know of no implementation that modifies buf to be an
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| 235 | unterminated string, so this strlen should be portable in
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| 236 | practice (rather than pulling in a safer strnlen). */
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| 237 | if (ret == ERANGE && strlen (buf) < buflen - 1)
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| 238 | {
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| 239 | char stackbuf[STACKBUF_LEN];
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| 240 |
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| 241 | /* STACKBUF_LEN should have been large enough. */
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| 242 | if (strerror_r (errnum, stackbuf, sizeof stackbuf) == ERANGE)
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| 243 | abort ();
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| 244 | safe_copy (buf, buflen, stackbuf);
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| 245 | }
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| 246 | # endif
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| 247 |
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| 248 | #else /* USE_SYSTEM_STRERROR */
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| 249 |
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| 250 | /* Try to do what strerror (errnum) does, but without clobbering the
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| 251 | buffer used by strerror(). */
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| 252 |
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| 253 | # if defined __NetBSD__ || defined __hpux || (defined _WIN32 && !defined __CYGWIN__) || defined __CYGWIN__ /* NetBSD, HP-UX, native Windows, Cygwin */
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| 254 |
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| 255 | /* NetBSD: sys_nerr, sys_errlist are declared through _NETBSD_SOURCE
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| 256 | and <errno.h> above.
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| 257 | HP-UX: sys_nerr, sys_errlist are declared explicitly above.
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| 258 | native Windows: sys_nerr, sys_errlist are declared in <stdlib.h>.
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| 259 | Cygwin: sys_nerr, sys_errlist are declared in <errno.h>. */
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| 260 | if (errnum >= 0 && errnum < sys_nerr)
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| 261 | {
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| 262 | # if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
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| 263 | # if defined __NetBSD__
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| 264 | nl_catd catd = catopen ("libc", NL_CAT_LOCALE);
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| 265 | const char *errmsg =
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| 266 | (catd != (nl_catd)-1
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| 267 | ? catgets (catd, 1, errnum, sys_errlist[errnum])
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| 268 | : sys_errlist[errnum]);
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| 269 | # endif
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| 270 | # if defined __hpux
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| 271 | nl_catd catd = catopen ("perror", NL_CAT_LOCALE);
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| 272 | const char *errmsg =
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| 273 | (catd != (nl_catd)-1
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| 274 | ? catgets (catd, 1, 1 + errnum, sys_errlist[errnum])
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| 275 | : sys_errlist[errnum]);
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| 276 | # endif
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| 277 | # else
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| 278 | const char *errmsg = sys_errlist[errnum];
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| 279 | # endif
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| 280 | if (errmsg == NULL || *errmsg == '\0')
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| 281 | ret = EINVAL;
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| 282 | else
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| 283 | ret = safe_copy (buf, buflen, errmsg);
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| 284 | # if HAVE_CATGETS && (defined __NetBSD__ || defined __hpux)
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| 285 | if (catd != (nl_catd)-1)
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| 286 | catclose (catd);
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| 287 | # endif
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| 288 | }
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| 289 | else
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| 290 | ret = EINVAL;
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| 291 |
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| 292 | # elif defined __sgi || (defined __sun && !defined _LP64) /* IRIX, Solaris <= 9 32-bit */
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| 293 |
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| 294 | /* For a valid error number, the system's strerror() function returns
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| 295 | a pointer to a not copied string, not to a buffer. */
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| 296 | if (errnum >= 0 && errnum < sys_nerr)
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| 297 | {
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| 298 | char *errmsg = strerror (errnum);
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| 299 |
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| 300 | if (errmsg == NULL || *errmsg == '\0')
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| 301 | ret = EINVAL;
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| 302 | else
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| 303 | ret = safe_copy (buf, buflen, errmsg);
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| 304 | }
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| 305 | else
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| 306 | ret = EINVAL;
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| 307 |
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| 308 | # else
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| 309 |
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| 310 | gl_lock_lock (strerror_lock);
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| 311 |
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| 312 | {
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| 313 | char *errmsg = strerror (errnum);
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| 314 |
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| 315 | /* For invalid error numbers, strerror() on
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| 316 | - IRIX 6.5 returns NULL,
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| 317 | - HP-UX 11 returns an empty string. */
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| 318 | if (errmsg == NULL || *errmsg == '\0')
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| 319 | ret = EINVAL;
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| 320 | else
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| 321 | ret = safe_copy (buf, buflen, errmsg);
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| 322 | }
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| 323 |
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| 324 | gl_lock_unlock (strerror_lock);
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| 325 |
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| 326 | # endif
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| 327 |
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| 328 | #endif
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| 329 |
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| 330 | #if defined _WIN32 && !defined __CYGWIN__
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| 331 | /* MSVC 14 defines names for many error codes in the range 100..140,
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| 332 | but _sys_errlist contains strings only for the error codes
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| 333 | < _sys_nerr = 43. */
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| 334 | if (ret == EINVAL)
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| 335 | {
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| 336 | const char *errmsg;
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| 337 |
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| 338 | switch (errnum)
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| 339 | {
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| 340 | case 100 /* EADDRINUSE */:
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| 341 | errmsg = "Address already in use";
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| 342 | break;
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| 343 | case 101 /* EADDRNOTAVAIL */:
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| 344 | errmsg = "Cannot assign requested address";
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| 345 | break;
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| 346 | case 102 /* EAFNOSUPPORT */:
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| 347 | errmsg = "Address family not supported by protocol";
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| 348 | break;
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| 349 | case 103 /* EALREADY */:
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| 350 | errmsg = "Operation already in progress";
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| 351 | break;
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| 352 | case 105 /* ECANCELED */:
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| 353 | errmsg = "Operation canceled";
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| 354 | break;
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| 355 | case 106 /* ECONNABORTED */:
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| 356 | errmsg = "Software caused connection abort";
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| 357 | break;
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| 358 | case 107 /* ECONNREFUSED */:
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| 359 | errmsg = "Connection refused";
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| 360 | break;
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| 361 | case 108 /* ECONNRESET */:
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| 362 | errmsg = "Connection reset by peer";
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| 363 | break;
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| 364 | case 109 /* EDESTADDRREQ */:
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| 365 | errmsg = "Destination address required";
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| 366 | break;
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| 367 | case 110 /* EHOSTUNREACH */:
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| 368 | errmsg = "No route to host";
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| 369 | break;
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| 370 | case 112 /* EINPROGRESS */:
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| 371 | errmsg = "Operation now in progress";
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| 372 | break;
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| 373 | case 113 /* EISCONN */:
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| 374 | errmsg = "Transport endpoint is already connected";
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| 375 | break;
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| 376 | case 114 /* ELOOP */:
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| 377 | errmsg = "Too many levels of symbolic links";
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| 378 | break;
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| 379 | case 115 /* EMSGSIZE */:
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| 380 | errmsg = "Message too long";
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| 381 | break;
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| 382 | case 116 /* ENETDOWN */:
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| 383 | errmsg = "Network is down";
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| 384 | break;
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| 385 | case 117 /* ENETRESET */:
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| 386 | errmsg = "Network dropped connection on reset";
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| 387 | break;
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| 388 | case 118 /* ENETUNREACH */:
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| 389 | errmsg = "Network is unreachable";
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| 390 | break;
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| 391 | case 119 /* ENOBUFS */:
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| 392 | errmsg = "No buffer space available";
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| 393 | break;
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| 394 | case 123 /* ENOPROTOOPT */:
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| 395 | errmsg = "Protocol not available";
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| 396 | break;
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| 397 | case 126 /* ENOTCONN */:
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| 398 | errmsg = "Transport endpoint is not connected";
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| 399 | break;
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| 400 | case 128 /* ENOTSOCK */:
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| 401 | errmsg = "Socket operation on non-socket";
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| 402 | break;
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| 403 | case 129 /* ENOTSUP */:
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| 404 | errmsg = "Not supported";
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| 405 | break;
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| 406 | case 130 /* EOPNOTSUPP */:
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| 407 | errmsg = "Operation not supported";
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| 408 | break;
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| 409 | case 132 /* EOVERFLOW */:
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| 410 | errmsg = "Value too large for defined data type";
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| 411 | break;
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| 412 | case 133 /* EOWNERDEAD */:
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| 413 | errmsg = "Owner died";
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| 414 | break;
|
|---|
| 415 | case 134 /* EPROTO */:
|
|---|
| 416 | errmsg = "Protocol error";
|
|---|
| 417 | break;
|
|---|
| 418 | case 135 /* EPROTONOSUPPORT */:
|
|---|
| 419 | errmsg = "Protocol not supported";
|
|---|
| 420 | break;
|
|---|
| 421 | case 136 /* EPROTOTYPE */:
|
|---|
| 422 | errmsg = "Protocol wrong type for socket";
|
|---|
| 423 | break;
|
|---|
| 424 | case 138 /* ETIMEDOUT */:
|
|---|
| 425 | errmsg = "Connection timed out";
|
|---|
| 426 | break;
|
|---|
| 427 | case 140 /* EWOULDBLOCK */:
|
|---|
| 428 | errmsg = "Operation would block";
|
|---|
| 429 | break;
|
|---|
| 430 | default:
|
|---|
| 431 | errmsg = NULL;
|
|---|
| 432 | break;
|
|---|
| 433 | }
|
|---|
| 434 | if (errmsg != NULL)
|
|---|
| 435 | ret = safe_copy (buf, buflen, errmsg);
|
|---|
| 436 | }
|
|---|
| 437 | #endif
|
|---|
| 438 |
|
|---|
| 439 | if (ret == EINVAL && !*buf)
|
|---|
| 440 | {
|
|---|
| 441 | #if defined __HAIKU__
|
|---|
| 442 | /* For consistency with perror(). */
|
|---|
| 443 | snprintf (buf, buflen, "Unknown Application Error (%d)", errnum);
|
|---|
| 444 | #else
|
|---|
| 445 | snprintf (buf, buflen, "Unknown error %d", errnum);
|
|---|
| 446 | #endif
|
|---|
| 447 | }
|
|---|
| 448 |
|
|---|
| 449 | errno = saved_errno;
|
|---|
| 450 | return ret;
|
|---|
| 451 | }
|
|---|
| 452 | }
|
|---|