1 /* Convert between signal names and numbers.
2 Copyright (C) 1990-2022 Free Software Foundation, Inc.
3 This file is part of GNU Make.
4
5 GNU Make is free software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the Free Software
7 Foundation; either version 3 of the License, or (at your option) any later
8 version.
9
10 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License along with
15 this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #include "makeint.h"
18
19 /* If the system provides strsignal, we don't need it. */
20
21 #if !HAVE_STRSIGNAL
22
23 /* If the system provides sys_siglist, we'll use that.
24 Otherwise create our own.
25 */
26
27 #if !HAVE_DECL_SYS_SIGLIST
28
29 /* Some systems do not define NSIG in <signal.h>. */
30 #ifndef NSIG
31 #ifdef _NSIG
32 #define NSIG _NSIG
33 #else
34 #define NSIG 32
35 #endif
36 #endif
37
38 /* There is too much variation in Sys V signal numbers and names, so
39 we must initialize them at runtime. */
40
41 static const char *undoc;
42
43 static const char *sys_siglist[NSIG];
44
45 /* Table of abbreviations for signals. Note: A given number can
46 appear more than once with different abbreviations. */
47 #define SIG_TABLE_SIZE (NSIG*2)
48
49 typedef struct
50 {
51 int number;
52 const char *abbrev;
53 } num_abbrev;
54
55 static num_abbrev sig_table[SIG_TABLE_SIZE];
56
57 /* Number of elements of sig_table used. */
58 static int sig_table_nelts = 0;
59
60 /* Enter signal number NUMBER into the tables with ABBREV and NAME. */
61
62 static void
63 init_sig (int number, const char *abbrev, const char *name)
64 {
65 /* If this value is ever greater than NSIG it seems like it'd be a bug in
66 the system headers, but... better safe than sorry. We know, for
67 example, that this isn't always true on VMS. */
68
69 if (number >= 0 && number < NSIG)
70 sys_siglist[number] = name;
71
72 if (sig_table_nelts < SIG_TABLE_SIZE)
73 {
74 sig_table[sig_table_nelts].number = number;
75 sig_table[sig_table_nelts++].abbrev = abbrev;
76 }
77 }
78
79 static int
80 signame_init (void)
81 {
82 int i;
83
84 undoc = xstrdup (_("unknown signal"));
85
86 /* Initialize signal names. */
87 for (i = 0; i < NSIG; i++)
88 sys_siglist[i] = undoc;
89
90 /* Initialize signal names. */
91 #if defined (SIGHUP)
92 init_sig (SIGHUP, "HUP", _("Hangup"));
93 #endif
94 #if defined (SIGINT)
95 init_sig (SIGINT, "INT", _("Interrupt"));
96 #endif
97 #if defined (SIGQUIT)
98 init_sig (SIGQUIT, "QUIT", _("Quit"));
99 #endif
100 #if defined (SIGILL)
101 init_sig (SIGILL, "ILL", _("Illegal Instruction"));
102 #endif
103 #if defined (SIGTRAP)
104 init_sig (SIGTRAP, "TRAP", _("Trace/breakpoint trap"));
105 #endif
106 /* If SIGIOT == SIGABRT, we want to print it as SIGABRT because
107 SIGABRT is in ANSI and POSIX.1 and SIGIOT isn't. */
108 #if defined (SIGABRT)
109 init_sig (SIGABRT, "ABRT", _("Aborted"));
110 #endif
111 #if defined (SIGIOT)
112 init_sig (SIGIOT, "IOT", _("IOT trap"));
113 #endif
114 #if defined (SIGEMT)
115 init_sig (SIGEMT, "EMT", _("EMT trap"));
116 #endif
117 #if defined (SIGFPE)
118 init_sig (SIGFPE, "FPE", _("Floating point exception"));
119 #endif
120 #if defined (SIGKILL)
121 init_sig (SIGKILL, "KILL", _("Killed"));
122 #endif
123 #if defined (SIGBUS)
124 init_sig (SIGBUS, "BUS", _("Bus error"));
125 #endif
126 #if defined (SIGSEGV)
127 init_sig (SIGSEGV, "SEGV", _("Segmentation fault"));
128 #endif
129 #if defined (SIGSYS)
130 init_sig (SIGSYS, "SYS", _("Bad system call"));
131 #endif
132 #if defined (SIGPIPE)
133 init_sig (SIGPIPE, "PIPE", _("Broken pipe"));
134 #endif
135 #if defined (SIGALRM)
136 init_sig (SIGALRM, "ALRM", _("Alarm clock"));
137 #endif
138 #if defined (SIGTERM)
139 init_sig (SIGTERM, "TERM", _("Terminated"));
140 #endif
141 #if defined (SIGUSR1)
142 init_sig (SIGUSR1, "USR1", _("User defined signal 1"));
143 #endif
144 #if defined (SIGUSR2)
145 init_sig (SIGUSR2, "USR2", _("User defined signal 2"));
146 #endif
147 /* If SIGCLD == SIGCHLD, we want to print it as SIGCHLD because that
148 is what is in POSIX.1. */
149 #if defined (SIGCHLD)
150 init_sig (SIGCHLD, "CHLD", _("Child exited"));
151 #endif
152 #if defined (SIGCLD)
153 init_sig (SIGCLD, "CLD", _("Child exited"));
154 #endif
155 #if defined (SIGPWR)
156 init_sig (SIGPWR, "PWR", _("Power failure"));
157 #endif
158 #if defined (SIGTSTP)
159 init_sig (SIGTSTP, "TSTP", _("Stopped"));
160 #endif
161 #if defined (SIGTTIN)
162 init_sig (SIGTTIN, "TTIN", _("Stopped (tty input)"));
163 #endif
164 #if defined (SIGTTOU)
165 init_sig (SIGTTOU, "TTOU", _("Stopped (tty output)"));
166 #endif
167 #if defined (SIGSTOP)
168 init_sig (SIGSTOP, "STOP", _("Stopped (signal)"));
169 #endif
170 #if defined (SIGXCPU)
171 init_sig (SIGXCPU, "XCPU", _("CPU time limit exceeded"));
172 #endif
173 #if defined (SIGXFSZ)
174 init_sig (SIGXFSZ, "XFSZ", _("File size limit exceeded"));
175 #endif
176 #if defined (SIGVTALRM)
177 init_sig (SIGVTALRM, "VTALRM", _("Virtual timer expired"));
178 #endif
179 #if defined (SIGPROF)
180 init_sig (SIGPROF, "PROF", _("Profiling timer expired"));
181 #endif
182 #if defined (SIGWINCH)
183 /* "Window size changed" might be more accurate, but even if that
184 is all that it means now, perhaps in the future it will be
185 extended to cover other kinds of window changes. */
186 init_sig (SIGWINCH, "WINCH", _("Window changed"));
187 #endif
188 #if defined (SIGCONT)
189 init_sig (SIGCONT, "CONT", _("Continued"));
190 #endif
191 #if defined (SIGURG)
192 init_sig (SIGURG, "URG", _("Urgent I/O condition"));
193 #endif
194 #if defined (SIGIO)
195 /* "I/O pending" has also been suggested. A disadvantage is that signal
196 only happens when the process has asked for it, not every time I/O is
197 pending. Another disadvantage is the confusion from giving it a
198 different name than under Unix. */
199 init_sig (SIGIO, "IO", _("I/O possible"));
200 #endif
201 #if defined (SIGWIND)
202 init_sig (SIGWIND, "WIND", _("SIGWIND"));
203 #endif
204 #if defined (SIGPHONE)
205 init_sig (SIGPHONE, "PHONE", _("SIGPHONE"));
206 #endif
207 #if defined (SIGPOLL)
208 init_sig (SIGPOLL, "POLL", _("I/O possible"));
209 #endif
210 #if defined (SIGLOST)
211 init_sig (SIGLOST, "LOST", _("Resource lost"));
212 #endif
213 #if defined (SIGDANGER)
214 init_sig (SIGDANGER, "DANGER", _("Danger signal"));
215 #endif
216 #if defined (SIGINFO)
217 init_sig (SIGINFO, "INFO", _("Information request"));
218 #endif
219 #if defined (SIGNOFP)
220 init_sig (SIGNOFP, "NOFP", _("Floating point co-processor not available"));
221 #endif
222
223 return 1;
224 }
225
226 #endif /* HAVE_DECL_SYS_SIGLIST */
227
228
229 char *
230 strsignal (int sig)
231 {
232 static char buf[] = "Signal 12345678901234567890";
233
234 #if ! HAVE_DECL_SYS_SIGLIST
235 # if HAVE_DECL__SYS_SIGLIST
236 # define sys_siglist _sys_siglist
237 # elif HAVE_DECL___SYS_SIGLIST
238 # define sys_siglist __sys_siglist
239 # else
240 static int sig_initted = 0;
241
242 if (!sig_initted)
243 sig_initted = signame_init ();
244 # endif
245 #endif
246
247 if (sig > 0 && sig < NSIG)
248 return (char *) sys_siglist[sig];
249
250 sprintf (buf, "Signal %d", sig);
251 return buf;
252 }
253
254 #endif /* HAVE_STRSIGNAL */