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24882e06 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2015 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
6bedfcbb LP |
22 | #include "parse-util.h" |
23 | #include "signal-util.h" | |
8b43440b | 24 | #include "string-table.h" |
07630cea | 25 | #include "string-util.h" |
24882e06 | 26 | #include "util.h" |
07630cea | 27 | |
24882e06 | 28 | int reset_all_signal_handlers(void) { |
0c2c2a3a LP |
29 | static const struct sigaction sa = { |
30 | .sa_handler = SIG_DFL, | |
31 | .sa_flags = SA_RESTART, | |
32 | }; | |
24882e06 LP |
33 | int sig, r = 0; |
34 | ||
35 | for (sig = 1; sig < _NSIG; sig++) { | |
24882e06 LP |
36 | |
37 | /* These two cannot be caught... */ | |
38 | if (sig == SIGKILL || sig == SIGSTOP) | |
39 | continue; | |
40 | ||
41 | /* On Linux the first two RT signals are reserved by | |
42 | * glibc, and sigaction() will return EINVAL for them. */ | |
43 | if ((sigaction(sig, &sa, NULL) < 0)) | |
0c2c2a3a | 44 | if (errno != EINVAL && r >= 0) |
24882e06 LP |
45 | r = -errno; |
46 | } | |
47 | ||
48 | return r; | |
49 | } | |
50 | ||
51 | int reset_signal_mask(void) { | |
52 | sigset_t ss; | |
53 | ||
54 | if (sigemptyset(&ss) < 0) | |
55 | return -errno; | |
56 | ||
57 | if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) | |
58 | return -errno; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
0c2c2a3a LP |
63 | static int sigaction_many_ap(const struct sigaction *sa, int sig, va_list ap) { |
64 | int r = 0; | |
65 | ||
66 | /* negative signal ends the list. 0 signal is skipped. */ | |
67 | ||
68 | if (sig < 0) | |
69 | return 0; | |
70 | ||
71 | if (sig > 0) { | |
72 | if (sigaction(sig, sa, NULL) < 0) | |
73 | r = -errno; | |
74 | } | |
75 | ||
76 | while ((sig = va_arg(ap, int)) >= 0) { | |
77 | ||
78 | if (sig == 0) | |
79 | continue; | |
80 | ||
81 | if (sigaction(sig, sa, NULL) < 0) { | |
82 | if (r >= 0) | |
83 | r = -errno; | |
84 | } | |
85 | } | |
86 | ||
87 | return r; | |
88 | } | |
89 | ||
24882e06 LP |
90 | int sigaction_many(const struct sigaction *sa, ...) { |
91 | va_list ap; | |
0c2c2a3a | 92 | int r; |
24882e06 LP |
93 | |
94 | va_start(ap, sa); | |
0c2c2a3a | 95 | r = sigaction_many_ap(sa, 0, ap); |
24882e06 LP |
96 | va_end(ap); |
97 | ||
98 | return r; | |
99 | } | |
100 | ||
101 | int ignore_signals(int sig, ...) { | |
0c2c2a3a | 102 | |
24882e06 LP |
103 | static const struct sigaction sa = { |
104 | .sa_handler = SIG_IGN, | |
105 | .sa_flags = SA_RESTART, | |
106 | }; | |
24882e06 | 107 | |
0c2c2a3a LP |
108 | va_list ap; |
109 | int r; | |
24882e06 LP |
110 | |
111 | va_start(ap, sig); | |
0c2c2a3a | 112 | r = sigaction_many_ap(&sa, sig, ap); |
24882e06 LP |
113 | va_end(ap); |
114 | ||
115 | return r; | |
116 | } | |
117 | ||
118 | int default_signals(int sig, ...) { | |
0c2c2a3a | 119 | |
24882e06 LP |
120 | static const struct sigaction sa = { |
121 | .sa_handler = SIG_DFL, | |
122 | .sa_flags = SA_RESTART, | |
123 | }; | |
24882e06 | 124 | |
0c2c2a3a LP |
125 | va_list ap; |
126 | int r; | |
24882e06 LP |
127 | |
128 | va_start(ap, sig); | |
0c2c2a3a | 129 | r = sigaction_many_ap(&sa, sig, ap); |
24882e06 LP |
130 | va_end(ap); |
131 | ||
132 | return r; | |
133 | } | |
134 | ||
0c2c2a3a LP |
135 | static int sigset_add_many_ap(sigset_t *ss, va_list ap) { |
136 | int sig, r = 0; | |
24882e06 LP |
137 | |
138 | assert(ss); | |
139 | ||
0c2c2a3a LP |
140 | while ((sig = va_arg(ap, int)) >= 0) { |
141 | ||
142 | if (sig == 0) | |
143 | continue; | |
144 | ||
145 | if (sigaddset(ss, sig) < 0) { | |
146 | if (r >= 0) | |
147 | r = -errno; | |
148 | } | |
149 | } | |
150 | ||
151 | return r; | |
152 | } | |
153 | ||
154 | int sigset_add_many(sigset_t *ss, ...) { | |
155 | va_list ap; | |
156 | int r; | |
157 | ||
24882e06 | 158 | va_start(ap, ss); |
0c2c2a3a | 159 | r = sigset_add_many_ap(ss, ap); |
24882e06 | 160 | va_end(ap); |
0c2c2a3a LP |
161 | |
162 | return r; | |
24882e06 LP |
163 | } |
164 | ||
72c0a2c2 | 165 | int sigprocmask_many(int how, sigset_t *old, ...) { |
24882e06 LP |
166 | va_list ap; |
167 | sigset_t ss; | |
0c2c2a3a | 168 | int r; |
24882e06 | 169 | |
0c2c2a3a LP |
170 | if (sigemptyset(&ss) < 0) |
171 | return -errno; | |
24882e06 | 172 | |
c59d3e8d | 173 | va_start(ap, old); |
0c2c2a3a | 174 | r = sigset_add_many_ap(&ss, ap); |
24882e06 LP |
175 | va_end(ap); |
176 | ||
0c2c2a3a LP |
177 | if (r < 0) |
178 | return r; | |
179 | ||
72c0a2c2 | 180 | if (sigprocmask(how, &ss, old) < 0) |
24882e06 LP |
181 | return -errno; |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static const char *const __signal_table[] = { | |
187 | [SIGHUP] = "HUP", | |
188 | [SIGINT] = "INT", | |
189 | [SIGQUIT] = "QUIT", | |
190 | [SIGILL] = "ILL", | |
191 | [SIGTRAP] = "TRAP", | |
192 | [SIGABRT] = "ABRT", | |
193 | [SIGBUS] = "BUS", | |
194 | [SIGFPE] = "FPE", | |
195 | [SIGKILL] = "KILL", | |
196 | [SIGUSR1] = "USR1", | |
197 | [SIGSEGV] = "SEGV", | |
198 | [SIGUSR2] = "USR2", | |
199 | [SIGPIPE] = "PIPE", | |
200 | [SIGALRM] = "ALRM", | |
201 | [SIGTERM] = "TERM", | |
202 | #ifdef SIGSTKFLT | |
203 | [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */ | |
204 | #endif | |
205 | [SIGCHLD] = "CHLD", | |
206 | [SIGCONT] = "CONT", | |
207 | [SIGSTOP] = "STOP", | |
208 | [SIGTSTP] = "TSTP", | |
209 | [SIGTTIN] = "TTIN", | |
210 | [SIGTTOU] = "TTOU", | |
211 | [SIGURG] = "URG", | |
212 | [SIGXCPU] = "XCPU", | |
213 | [SIGXFSZ] = "XFSZ", | |
214 | [SIGVTALRM] = "VTALRM", | |
215 | [SIGPROF] = "PROF", | |
216 | [SIGWINCH] = "WINCH", | |
217 | [SIGIO] = "IO", | |
218 | [SIGPWR] = "PWR", | |
219 | [SIGSYS] = "SYS" | |
220 | }; | |
221 | ||
222 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int); | |
223 | ||
224 | const char *signal_to_string(int signo) { | |
225 | static thread_local char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1]; | |
226 | const char *name; | |
227 | ||
228 | name = __signal_to_string(signo); | |
229 | if (name) | |
230 | return name; | |
231 | ||
232 | if (signo >= SIGRTMIN && signo <= SIGRTMAX) | |
233 | snprintf(buf, sizeof(buf), "RTMIN+%d", signo - SIGRTMIN); | |
234 | else | |
235 | snprintf(buf, sizeof(buf), "%d", signo); | |
236 | ||
237 | return buf; | |
238 | } | |
239 | ||
240 | int signal_from_string(const char *s) { | |
241 | int signo; | |
242 | int offset = 0; | |
243 | unsigned u; | |
244 | ||
245 | signo = __signal_from_string(s); | |
246 | if (signo > 0) | |
247 | return signo; | |
248 | ||
249 | if (startswith(s, "RTMIN+")) { | |
250 | s += 6; | |
251 | offset = SIGRTMIN; | |
252 | } | |
253 | if (safe_atou(s, &u) >= 0) { | |
254 | signo = (int) u + offset; | |
255 | if (signo > 0 && signo < _NSIG) | |
256 | return signo; | |
257 | } | |
258 | return -EINVAL; | |
259 | } | |
260 | ||
261 | int signal_from_string_try_harder(const char *s) { | |
262 | int signo; | |
263 | assert(s); | |
264 | ||
265 | signo = signal_from_string(s); | |
266 | if (signo <= 0) | |
267 | if (startswith(s, "SIG")) | |
268 | return signal_from_string(s+3); | |
269 | ||
270 | return signo; | |
271 | } | |
6bedfcbb LP |
272 | |
273 | void nop_signal_handler(int sig) { | |
274 | /* nothing here */ | |
275 | } |