1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <assert.h>
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <string.h>
#include <syscall.h>
#include <unistd.h>
extern "C" {
int kill(pid_t pid, int sig)
{
int rc = syscall(SC_kill, pid, sig);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int killpg(int pgrp, int sig)
{
int rc = syscall(SC_killpg, pgrp, sig);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int raise(int sig)
{
// FIXME: Support multi-threaded programs.
return kill(getpid(), sig);
}
sighandler_t signal(int signum, sighandler_t handler)
{
struct sigaction new_act;
struct sigaction old_act;
new_act.sa_handler = handler;
new_act.sa_flags = 0;
new_act.sa_mask = 0;
int rc = sigaction(signum, &new_act, &old_act);
if (rc < 0)
return SIG_ERR;
return old_act.sa_handler;
}
int sigaction(int signum, const struct sigaction* act, struct sigaction* old_act)
{
int rc = syscall(SC_sigaction, signum, act, old_act);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int sigemptyset(sigset_t* set)
{
*set = 0;
return 0;
}
int sigfillset(sigset_t* set)
{
*set = 0xffffffff;
return 0;
}
int sigaddset(sigset_t* set, int sig)
{
if (sig < 1 || sig > 32) {
errno = EINVAL;
return -1;
}
*set |= 1 << (sig - 1);
return 0;
}
int sigdelset(sigset_t* set, int sig)
{
if (sig < 1 || sig > 32) {
errno = EINVAL;
return -1;
}
*set &= ~(1 << (sig - 1));
return 0;
}
int sigismember(const sigset_t* set, int sig)
{
if (sig < 1 || sig > 32) {
errno = EINVAL;
return -1;
}
if (*set & (1 << (sig - 1)))
return 1;
return 0;
}
int sigprocmask(int how, const sigset_t* set, sigset_t* old_set)
{
int rc = syscall(SC_sigprocmask, how, set, old_set);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int sigpending(sigset_t* set)
{
int rc = syscall(SC_sigpending, set);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
const char* sys_siglist[NSIG] = {
"Invalid signal number",
"Hangup",
"Interrupt",
"Quit",
"Illegal instruction",
"Trap",
"Aborted",
"Bus error",
"Division by zero",
"Killed",
"User signal 1",
"Segmentation violation",
"User signal 2",
"Broken pipe",
"Alarm clock",
"Terminated",
"Stack fault",
"Child exited",
"Continued",
"Stopped (signal)",
"Stopped",
"Stopped (tty input)",
"Stopped (tty output)",
"Urgent I/O condition)",
"CPU limit exceeded",
"File size limit exceeded",
"Virtual timer expired",
"Profiling timer expired",
"Window changed",
"I/O possible",
"Power failure",
"Bad system call",
};
int sigsetjmp(jmp_buf env, int savesigs)
{
if (savesigs) {
int rc = sigprocmask(0, nullptr, &env->saved_signal_mask);
assert(rc == 0);
env->did_save_signal_mask = true;
} else {
env->did_save_signal_mask = false;
}
return setjmp(env);
}
void siglongjmp(jmp_buf env, int val)
{
if (env->did_save_signal_mask) {
int rc = sigprocmask(SIG_SETMASK, &env->saved_signal_mask, nullptr);
assert(rc == 0);
}
longjmp(env, val);
}
int sigsuspend(const sigset_t*)
{
dbgln("FIXME: Implement sigsuspend()");
TODO();
}
static const char* signal_names[] = {
"INVAL",
"HUP",
"INT",
"QUIT",
"ILL",
"TRAP",
"ABRT",
"BUS",
"FPE",
"KILL",
"USR1",
"SEGV",
"USR2",
"PIPE",
"ALRM",
"TERM",
"STKFLT",
"CHLD",
"CONT",
"STOP",
"TSTP",
"TTIN",
"TTOU",
"URG",
"XCPU",
"XFSZ",
"VTALRM",
"PROF",
"WINCH",
"IO",
"INFO",
"SYS",
};
static_assert(sizeof(signal_names) == sizeof(const char*) * NSIG);
int getsignalbyname(const char* name)
{
VERIFY(name);
for (size_t i = 0; i < NSIG; ++i) {
auto* signal_name = signal_names[i];
if (!strcmp(signal_name, name))
return i;
}
errno = EINVAL;
return -1;
}
const char* getsignalname(int signal)
{
if (signal < 0 || signal >= NSIG) {
errno = EINVAL;
return nullptr;
}
return signal_names[signal];
}
}
|
