1 /* $OpenBSD: strerror_r.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */ 2 /* Public Domain <marc (at) snafu.org> */ 3 4 // G++ automatically defines _GNU_SOURCE, which then means that <string.h> 5 // gives us the GNU variant. 6 #undef _GNU_SOURCE 7 8 #include <string.h> 9 10 #include <errno.h> 11 #include <limits.h> 12 #include <signal.h> 13 #include <stdio.h> 14 15 #include <async_safe/log.h> 16 17 #include "private/ErrnoRestorer.h" 18 19 struct Pair { 20 int code; 21 const char* msg; 22 }; 23 24 static const char* __code_string_lookup(const Pair* strings, int code) { 25 for (size_t i = 0; strings[i].msg != NULL; ++i) { 26 if (strings[i].code == code) { 27 return strings[i].msg; 28 } 29 } 30 return NULL; 31 } 32 33 static const Pair _sys_error_strings[] = { 34 #define __BIONIC_ERRDEF(x,y,z) { x, z }, 35 #include "private/bionic_errdefs.h" 36 { 0, NULL } 37 }; 38 39 extern "C" __LIBC_HIDDEN__ const char* __strerror_lookup(int error_number) { 40 return __code_string_lookup(_sys_error_strings, error_number); 41 } 42 43 static const Pair _sys_signal_strings[] = { 44 #define __BIONIC_SIGDEF(signal_number, signal_description) { signal_number, signal_description }, 45 #include "private/bionic_sigdefs.h" 46 { 0, NULL } 47 }; 48 49 extern "C" __LIBC_HIDDEN__ const char* __strsignal_lookup(int signal_number) { 50 return __code_string_lookup(_sys_signal_strings, signal_number); 51 } 52 53 int strerror_r(int error_number, char* buf, size_t buf_len) { 54 ErrnoRestorer errno_restorer; 55 size_t length; 56 57 const char* error_name = __strerror_lookup(error_number); 58 if (error_name != NULL) { 59 length = strlcpy(buf, error_name, buf_len); 60 } else { 61 length = async_safe_format_buffer(buf, buf_len, "Unknown error %d", error_number); 62 } 63 if (length >= buf_len) { 64 errno_restorer.override(ERANGE); 65 return -1; 66 } 67 68 return 0; 69 } 70 71 extern "C" char* __gnu_strerror_r(int error_number, char* buf, size_t buf_len) { 72 ErrnoRestorer errno_restorer; // The glibc strerror_r doesn't set errno if it truncates... 73 strerror_r(error_number, buf, buf_len); 74 return buf; // ...and just returns whatever fit. 75 } 76 77 extern "C" __LIBC_HIDDEN__ const char* __strsignal(int signal_number, char* buf, size_t buf_len) { 78 const char* signal_name = __strsignal_lookup(signal_number); 79 if (signal_name != NULL) { 80 return signal_name; 81 } 82 83 const char* prefix = "Unknown"; 84 if (signal_number >= SIGRTMIN && signal_number <= SIGRTMAX) { 85 prefix = "Real-time"; 86 signal_number -= SIGRTMIN; 87 } 88 size_t length = snprintf(buf, buf_len, "%s signal %d", prefix, signal_number); 89 if (length >= buf_len) { 90 return NULL; 91 } 92 return buf; 93 } 94
