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 #include <signal.h>
30 #include <stdlib.h>
31 #include <string.h>
32
33 #include "bionic/pthread_internal.h"
34
35 // Maps regular signals like SIGSEGV to strings like "Segmentation fault".
36 // Signal 0 and all the real-time signals are just nullptr, but that's the ABI.
37 const char* const sys_siglist[NSIG] = {
38 #define __BIONIC_SIGDEF(signal_number, signal_description) [signal_number] = signal_description,
39 #include "private/bionic_sigdefs.h"
40 };
41
42 // Maps regular signals like SIGSEGV to strings like "SEGV".
43 // Signal 0 and all the real-time signals are just nullptr, but that's the ABI.
44 const char* const sys_signame[NSIG] = {
45 #define __BIONIC_SIGDEF(signal_number, unused) [signal_number] = &(#signal_number)[3],
46 #include "private/bionic_sigdefs.h"
47 };
48
__strsignal(int signal_number,char * buf,size_t buf_len)49 extern "C" __LIBC_HIDDEN__ const char* __strsignal(int signal_number, char* buf, size_t buf_len) {
50 if (signal_number >= SIGHUP && signal_number < SIGSYS) {
51 return sys_siglist[signal_number];
52 }
53 const char* prefix = "Unknown";
54 if (signal_number >= SIGRTMIN && signal_number <= SIGRTMAX) {
55 prefix = "Real-time";
56 signal_number -= SIGRTMIN;
57 }
58 size_t length = snprintf(buf, buf_len, "%s signal %d", prefix, signal_number);
59 if (length >= buf_len) {
60 return nullptr;
61 }
62 return buf;
63 }
64
strsignal(int signal_number)65 char* strsignal(int signal_number) {
66 bionic_tls& tls = __get_bionic_tls();
67 return const_cast<char*>(__strsignal(signal_number, tls.strsignal_buf, sizeof(tls.strsignal_buf)));
68 }
69
sig2str(int sig,char * str)70 int sig2str(int sig, char* str) {
71 if (sig >= SIGHUP && sig <= SIGSYS) {
72 strcpy(str, sys_signame[sig]);
73 return 0;
74 }
75 if (sig == SIGRTMIN) {
76 strcpy(str, "RTMIN");
77 return 0;
78 }
79 if (sig == SIGRTMAX) {
80 strcpy(str, "RTMAX");
81 return 0;
82 }
83 if (sig > SIGRTMIN && sig < SIGRTMAX) {
84 if (sig - SIGRTMIN <= SIGRTMAX - sig) {
85 sprintf(str, "RTMIN+%d", sig - SIGRTMIN);
86 } else {
87 sprintf(str, "RTMAX-%d", SIGRTMAX - sig);
88 }
89 return 0;
90 }
91 return -1;
92 }
93
str2sig(const char * str,int * sig)94 int str2sig(const char* str, int* sig) {
95 // A name in our list, like "SEGV"?
96 for (size_t i = SIGHUP; i <= SIGSYS; ++i) {
97 if (!strcmp(str, sys_signame[i])) {
98 *sig = i;
99 return 0;
100 }
101 }
102
103 // The two named special cases?
104 if (!strcmp(str, "RTMIN")) {
105 *sig = SIGRTMIN;
106 return 0;
107 }
108 if (!strcmp(str, "RTMAX")) {
109 *sig = SIGRTMAX;
110 return 0;
111 }
112
113 // Must be either an integer corresponding to a regular signal such as "9",
114 // or a string of the form "RTMIN+%d" or "RTMAX-%d".
115 int base = 0;
116 if (!strncmp(str, "RTMIN+", 6)) {
117 base = SIGRTMIN;
118 str += 5;
119 } else if (!strncmp(str, "RTMAX-", 6)) {
120 base = SIGRTMAX;
121 str += 5;
122 }
123 char* end = nullptr;
124 errno = 0;
125 int offset = strtol(str, &end, 10);
126 if (errno || *end) return -1;
127
128 // Reject out of range integers (like "666"),
129 // and out of range real-time signals (like "RTMIN+666" or "RTMAX-666").
130 int result = base + offset;
131 bool regular = (base == 0 && result >= SIGHUP && result <= SIGSYS);
132 bool realtime = (result >= SIGRTMIN && result <= SIGRTMAX);
133 if (!regular && !realtime) return -1;
134
135 *sig = result;
136 return 0;
137 }
138