Contents of /tags/mkinitrd-6_2_3/busybox/libbb/signals.c
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Mon May 31 20:54:44 2010 UTC (14 years, 4 months ago) by niro
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File size: 2289 byte(s)
Mon May 31 20:54:44 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2289 byte(s)
tagged 'mkinitrd-6_2_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * Copyright (C) 2006 Rob Landley |
7 | * Copyright (C) 2006 Denys Vlasenko |
8 | * |
9 | * Licensed under GPL version 2, see file LICENSE in this tarball for details. |
10 | */ |
11 | |
12 | #include "libbb.h" |
13 | |
14 | /* All known arches use small ints for signals */ |
15 | smallint bb_got_signal; |
16 | |
17 | void record_signo(int signo) |
18 | { |
19 | bb_got_signal = signo; |
20 | } |
21 | |
22 | /* Saves 2 bytes on x86! Oh my... */ |
23 | int FAST_FUNC sigaction_set(int signum, const struct sigaction *act) |
24 | { |
25 | return sigaction(signum, act, NULL); |
26 | } |
27 | |
28 | int FAST_FUNC sigprocmask_allsigs(int how) |
29 | { |
30 | sigset_t set; |
31 | sigfillset(&set); |
32 | return sigprocmask(how, &set, NULL); |
33 | } |
34 | |
35 | void FAST_FUNC bb_signals(int sigs, void (*f)(int)) |
36 | { |
37 | int sig_no = 0; |
38 | int bit = 1; |
39 | |
40 | while (sigs) { |
41 | if (sigs & bit) { |
42 | sigs &= ~bit; |
43 | signal(sig_no, f); |
44 | } |
45 | sig_no++; |
46 | bit <<= 1; |
47 | } |
48 | } |
49 | |
50 | void FAST_FUNC bb_signals_recursive_norestart(int sigs, void (*f)(int)) |
51 | { |
52 | int sig_no = 0; |
53 | int bit = 1; |
54 | struct sigaction sa; |
55 | |
56 | memset(&sa, 0, sizeof(sa)); |
57 | sa.sa_handler = f; |
58 | /*sa.sa_flags = 0;*/ |
59 | /*sigemptyset(&sa.sa_mask); - hope memset did it*/ |
60 | |
61 | while (sigs) { |
62 | if (sigs & bit) { |
63 | sigs &= ~bit; |
64 | sigaction_set(sig_no, &sa); |
65 | } |
66 | sig_no++; |
67 | bit <<= 1; |
68 | } |
69 | } |
70 | |
71 | void FAST_FUNC sig_block(int sig) |
72 | { |
73 | sigset_t ss; |
74 | sigemptyset(&ss); |
75 | sigaddset(&ss, sig); |
76 | sigprocmask(SIG_BLOCK, &ss, NULL); |
77 | } |
78 | |
79 | void FAST_FUNC sig_unblock(int sig) |
80 | { |
81 | sigset_t ss; |
82 | sigemptyset(&ss); |
83 | sigaddset(&ss, sig); |
84 | sigprocmask(SIG_UNBLOCK, &ss, NULL); |
85 | } |
86 | |
87 | void FAST_FUNC wait_for_any_sig(void) |
88 | { |
89 | sigset_t ss; |
90 | sigemptyset(&ss); |
91 | sigsuspend(&ss); |
92 | } |
93 | |
94 | /* Assuming the sig is fatal */ |
95 | void FAST_FUNC kill_myself_with_sig(int sig) |
96 | { |
97 | signal(sig, SIG_DFL); |
98 | sig_unblock(sig); |
99 | raise(sig); |
100 | _exit(EXIT_FAILURE); /* Should not reach it */ |
101 | } |
102 | |
103 | void FAST_FUNC signal_SA_RESTART_empty_mask(int sig, void (*handler)(int)) |
104 | { |
105 | struct sigaction sa; |
106 | memset(&sa, 0, sizeof(sa)); |
107 | /*sigemptyset(&sa.sa_mask);*/ |
108 | sa.sa_flags = SA_RESTART; |
109 | sa.sa_handler = handler; |
110 | sigaction_set(sig, &sa); |
111 | } |
112 | |
113 | void FAST_FUNC signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int)) |
114 | { |
115 | struct sigaction sa; |
116 | memset(&sa, 0, sizeof(sa)); |
117 | /*sigemptyset(&sa.sa_mask);*/ |
118 | /*sa.sa_flags = 0;*/ |
119 | sa.sa_handler = handler; |
120 | sigaction_set(sig, &sa); |
121 | } |