[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | * Copyright (C) 2006 Rob Landley
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| 7 | * Copyright (C) 2006 Denys Vlasenko
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| 8 | *
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| 9 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 10 | */
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| 11 |
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| 12 | #include "libbb.h"
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| 13 |
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| 14 | /* All known arches use small ints for signals */
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| 15 | smallint bb_got_signal;
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| 16 |
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| 17 | void record_signo(int signo)
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| 18 | {
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| 19 | bb_got_signal = signo;
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| 20 | }
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| 21 |
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| 22 | /* Saves 2 bytes on x86! Oh my... */
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| 23 | int FAST_FUNC sigaction_set(int signum, const struct sigaction *act)
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| 24 | {
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| 25 | return sigaction(signum, act, NULL);
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| 26 | }
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| 27 |
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| 28 | int FAST_FUNC sigprocmask_allsigs(int how)
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| 29 | {
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| 30 | sigset_t set;
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| 31 | sigfillset(&set);
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| 32 | return sigprocmask(how, &set, NULL);
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| 33 | }
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| 34 |
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| 35 | void FAST_FUNC bb_signals(int sigs, void (*f)(int))
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| 36 | {
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| 37 | int sig_no = 0;
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| 38 | int bit = 1;
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| 39 |
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| 40 | while (sigs) {
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| 41 | if (sigs & bit) {
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[3232] | 42 | sigs -= bit;
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[2725] | 43 | signal(sig_no, f);
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| 44 | }
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| 45 | sig_no++;
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| 46 | bit <<= 1;
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| 47 | }
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| 48 | }
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| 49 |
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| 50 | void FAST_FUNC bb_signals_recursive_norestart(int sigs, void (*f)(int))
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| 51 | {
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| 52 | int sig_no = 0;
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| 53 | int bit = 1;
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| 54 | struct sigaction sa;
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| 55 |
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| 56 | memset(&sa, 0, sizeof(sa));
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| 57 | sa.sa_handler = f;
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| 58 | /*sa.sa_flags = 0;*/
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| 59 | /*sigemptyset(&sa.sa_mask); - hope memset did it*/
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| 60 |
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| 61 | while (sigs) {
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| 62 | if (sigs & bit) {
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[3232] | 63 | sigs -= bit;
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[2725] | 64 | sigaction_set(sig_no, &sa);
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| 65 | }
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| 66 | sig_no++;
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| 67 | bit <<= 1;
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | void FAST_FUNC sig_block(int sig)
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| 72 | {
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| 73 | sigset_t ss;
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| 74 | sigemptyset(&ss);
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| 75 | sigaddset(&ss, sig);
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| 76 | sigprocmask(SIG_BLOCK, &ss, NULL);
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| 77 | }
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| 78 |
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| 79 | void FAST_FUNC sig_unblock(int sig)
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| 80 | {
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| 81 | sigset_t ss;
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| 82 | sigemptyset(&ss);
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| 83 | sigaddset(&ss, sig);
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| 84 | sigprocmask(SIG_UNBLOCK, &ss, NULL);
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| 85 | }
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| 86 |
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| 87 | void FAST_FUNC wait_for_any_sig(void)
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| 88 | {
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| 89 | sigset_t ss;
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| 90 | sigemptyset(&ss);
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| 91 | sigsuspend(&ss);
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| 92 | }
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| 93 |
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| 94 | /* Assuming the sig is fatal */
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| 95 | void FAST_FUNC kill_myself_with_sig(int sig)
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| 96 | {
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| 97 | signal(sig, SIG_DFL);
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| 98 | sig_unblock(sig);
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| 99 | raise(sig);
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[3232] | 100 | _exit(sig | 128); /* Should not reach it */
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[2725] | 101 | }
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| 102 |
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| 103 | void FAST_FUNC signal_SA_RESTART_empty_mask(int sig, void (*handler)(int))
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| 104 | {
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| 105 | struct sigaction sa;
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| 106 | memset(&sa, 0, sizeof(sa));
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| 107 | /*sigemptyset(&sa.sa_mask);*/
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| 108 | sa.sa_flags = SA_RESTART;
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| 109 | sa.sa_handler = handler;
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| 110 | sigaction_set(sig, &sa);
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| 111 | }
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| 112 |
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| 113 | void FAST_FUNC signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int))
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| 114 | {
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| 115 | struct sigaction sa;
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| 116 | memset(&sa, 0, sizeof(sa));
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| 117 | /*sigemptyset(&sa.sa_mask);*/
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| 118 | /*sa.sa_flags = 0;*/
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| 119 | sa.sa_handler = handler;
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| 120 | sigaction_set(sig, &sa);
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| 121 | }
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