1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 // G++ automatically defines _GNU_SOURCE, which then means that <string.h>
30 // gives us the GNU variant.
31 #undef _GNU_SOURCE
32
33 #include <string.h>
34
35 #include <errno.h>
36 #include <limits.h>
37
38 #include <async_safe/log.h>
39
40 #include "private/ErrnoRestorer.h"
41
42 #include <string.h>
43
44 #include "bionic/pthread_internal.h"
45
46 static const char* __sys_error_strings[] = {
47 [0] = "Success",
48 [EPERM] = "Operation not permitted",
49 [ENOENT] = "No such file or directory",
50 [ESRCH] = "No such process",
51 [EINTR] = "Interrupted system call",
52 [EIO] = "I/O error",
53 [ENXIO] = "No such device or address",
54 [E2BIG] = "Argument list too long",
55 [ENOEXEC] = "Exec format error",
56 [EBADF] = "Bad file descriptor",
57 [ECHILD] = "No child processes",
58 [EAGAIN] = "Try again",
59 [ENOMEM] = "Out of memory",
60 [EACCES] = "Permission denied",
61 [EFAULT] = "Bad address",
62 [ENOTBLK] = "Block device required",
63 [EBUSY] = "Device or resource busy",
64 [EEXIST] = "File exists",
65 [EXDEV] = "Cross-device link",
66 [ENODEV] = "No such device",
67 [ENOTDIR] = "Not a directory",
68 [EISDIR] = "Is a directory",
69 [EINVAL] = "Invalid argument",
70 [ENFILE] = "File table overflow",
71 [EMFILE] = "Too many open files",
72 [ENOTTY] = "Inappropriate ioctl for device",
73 [ETXTBSY] = "Text file busy",
74 [EFBIG] = "File too large",
75 [ENOSPC] = "No space left on device",
76 [ESPIPE] = "Illegal seek",
77 [EROFS] = "Read-only file system",
78 [EMLINK] = "Too many links",
79 [EPIPE] = "Broken pipe",
80 [EDOM] = "Math argument out of domain of func",
81 [ERANGE] = "Math result not representable",
82 [EDEADLK] = "Resource deadlock would occur",
83 [ENAMETOOLONG] = "File name too long",
84 [ENOLCK] = "No record locks available",
85 [ENOSYS] = "Function not implemented",
86 [ENOTEMPTY] = "Directory not empty",
87 [ELOOP] = "Too many symbolic links encountered",
88 [ENOMSG] = "No message of desired type",
89 [EIDRM] = "Identifier removed",
90 [ECHRNG] = "Channel number out of range",
91 [EL2NSYNC] = "Level 2 not synchronized",
92 [EL3HLT] = "Level 3 halted",
93 [EL3RST] = "Level 3 reset",
94 [ELNRNG] = "Link number out of range",
95 [EUNATCH] = "Protocol driver not attached",
96 [ENOCSI] = "No CSI structure available",
97 [EL2HLT] = "Level 2 halted",
98 [EBADE] = "Invalid exchange",
99 [EBADR] = "Invalid request descriptor",
100 [EXFULL] = "Exchange full",
101 [ENOANO] = "No anode",
102 [EBADRQC] = "Invalid request code",
103 [EBADSLT] = "Invalid slot",
104 [EBFONT] = "Bad font file format",
105 [ENOSTR] = "Device not a stream",
106 [ENODATA] = "No data available",
107 [ETIME] = "Timer expired",
108 [ENOSR] = "Out of streams resources",
109 [ENONET] = "Machine is not on the network",
110 [ENOPKG] = "Package not installed",
111 [EREMOTE] = "Object is remote",
112 [ENOLINK] = "Link has been severed",
113 [EADV] = "Advertise error",
114 [ESRMNT] = "Srmount error",
115 [ECOMM] = "Communication error on send",
116 [EPROTO] = "Protocol error",
117 [EMULTIHOP] = "Multihop attempted",
118 [EDOTDOT] = "RFS specific error",
119 [EBADMSG] = "Not a data message",
120 [EOVERFLOW] = "Value too large for defined data type",
121 [ENOTUNIQ] = "Name not unique on network",
122 [EBADFD] = "File descriptor in bad state",
123 [EREMCHG] = "Remote address changed",
124 [ELIBACC] = "Can not access a needed shared library",
125 [ELIBBAD] = "Accessing a corrupted shared library",
126 [ELIBSCN] = ".lib section in a.out corrupted",
127 [ELIBMAX] = "Attempting to link in too many shared libraries",
128 [ELIBEXEC] = "Cannot exec a shared library directly",
129 [EILSEQ] = "Illegal byte sequence",
130 [ERESTART] = "Interrupted system call should be restarted",
131 [ESTRPIPE] = "Streams pipe error",
132 [EUSERS] = "Too many users",
133 [ENOTSOCK] = "Socket operation on non-socket",
134 [EDESTADDRREQ] = "Destination address required",
135 [EMSGSIZE] = "Message too long",
136 [EPROTOTYPE] = "Protocol wrong type for socket",
137 [ENOPROTOOPT] = "Protocol not available",
138 [EPROTONOSUPPORT] = "Protocol not supported",
139 [ESOCKTNOSUPPORT] = "Socket type not supported",
140 [EOPNOTSUPP] = "Operation not supported on transport endpoint",
141 [EPFNOSUPPORT] = "Protocol family not supported",
142 [EAFNOSUPPORT] = "Address family not supported by protocol",
143 [EADDRINUSE] = "Address already in use",
144 [EADDRNOTAVAIL] = "Cannot assign requested address",
145 [ENETDOWN] = "Network is down",
146 [ENETUNREACH] = "Network is unreachable",
147 [ENETRESET] = "Network dropped connection because of reset",
148 [ECONNABORTED] = "Software caused connection abort",
149 [ECONNRESET] = "Connection reset by peer",
150 [ENOBUFS] = "No buffer space available",
151 [EISCONN] = "Transport endpoint is already connected",
152 [ENOTCONN] = "Transport endpoint is not connected",
153 [ESHUTDOWN] = "Cannot send after transport endpoint shutdown",
154 [ETOOMANYREFS] = "Too many references: cannot splice",
155 [ETIMEDOUT] = "Connection timed out",
156 [ECONNREFUSED] = "Connection refused",
157 [EHOSTDOWN] = "Host is down",
158 [EHOSTUNREACH] = "No route to host",
159 [EALREADY] = "Operation already in progress",
160 [EINPROGRESS] = "Operation now in progress",
161 [ESTALE] = "Stale NFS file handle",
162 [EUCLEAN] = "Structure needs cleaning",
163 [ENOTNAM] = "Not a XENIX named type file",
164 [ENAVAIL] = "No XENIX semaphores available",
165 [EISNAM] = "Is a named type file",
166 [EREMOTEIO] = "Remote I/O error",
167 [EDQUOT] = "Quota exceeded",
168 [ENOMEDIUM] = "No medium found",
169 [EMEDIUMTYPE] = "Wrong medium type",
170 [ECANCELED] = "Operation Canceled",
171 [ENOKEY] = "Required key not available",
172 [EKEYEXPIRED] = "Key has expired",
173 [EKEYREVOKED] = "Key has been revoked",
174 [EKEYREJECTED] = "Key was rejected by service",
175 [EOWNERDEAD] = "Owner died",
176 [ENOTRECOVERABLE] = "State not recoverable",
177 [ERFKILL] = "Operation not possible due to RF-kill",
178 [EHWPOISON] = "Memory page has hardware error",
179 };
180
__strerror_lookup(int error_number)181 static inline const char* __strerror_lookup(int error_number) {
182 if (error_number < 0 || error_number >= static_cast<int>(arraysize(__sys_error_strings))) {
183 return nullptr;
184 }
185 return __sys_error_strings[error_number];
186 }
187
strerror_r(int error_number,char * buf,size_t buf_len)188 int strerror_r(int error_number, char* buf, size_t buf_len) {
189 ErrnoRestorer errno_restorer;
190 size_t length;
191
192 const char* error_name = __strerror_lookup(error_number);
193 if (error_name != nullptr) {
194 length = strlcpy(buf, error_name, buf_len);
195 } else {
196 length = async_safe_format_buffer(buf, buf_len, "Unknown error %d", error_number);
197 }
198 if (length >= buf_len) {
199 errno_restorer.override(ERANGE);
200 return -1;
201 }
202
203 return 0;
204 }
205
__gnu_strerror_r(int error_number,char * buf,size_t buf_len)206 extern "C" char* __gnu_strerror_r(int error_number, char* buf, size_t buf_len) {
207 ErrnoRestorer errno_restorer; // The glibc strerror_r doesn't set errno if it truncates...
208 strerror_r(error_number, buf, buf_len);
209 return buf; // ...and just returns whatever fit.
210 }
211
strerror(int error_number)212 char* strerror(int error_number) {
213 // Just return the original constant in the easy cases.
214 char* result = const_cast<char*>(__strerror_lookup(error_number));
215 if (result != nullptr) {
216 return result;
217 }
218
219 bionic_tls& tls = __get_bionic_tls();
220 result = tls.strerror_buf;
221 strerror_r(error_number, result, sizeof(tls.strerror_buf));
222 return result;
223 }
224