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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42 | sigs -= bit;
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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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63 | sigs -= bit;
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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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100 | _exit(sig | 128); /* Should not reach it */
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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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