1 | #!/usr/bin/env bash
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2 | #
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3 | # Demo of traps.
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4 |
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5 | # BUG: OSH doesn't run the trap because of KeyboardInterrupt!
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6 |
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7 | # BUG interactively too:
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8 | #
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9 | # osh$ trap 'echo INT' SIGINT; sleep 5 & wait
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10 |
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11 | sigint-batch() {
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12 | trap 'echo [got SIGINT]' INT
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13 | echo "Registered SIGINT trap. Hit Ctrl-C or Run 'kill -INT $$' to see a message."
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14 | sleep 5
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15 | }
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16 |
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17 | sigterm-batch() {
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18 | trap 'echo [got SIGTERM]' TERM
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19 | echo "Registered SIGTERM trap. Run 'kill -TERM $$' to see a message."
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20 | sleep 5
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21 | }
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22 |
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23 | # BUG: OSH gets two sigterms?
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24 | sigterm-then-kill-test() {
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25 | local sh=${1:-bash}
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26 | #### SIGTERM trap should run upon 'kill'
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27 | $sh -c 'echo "> PID $$ started";
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28 | echo $$ > _tmp/pid.txt;
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29 | trap "echo SIGTERM" TERM;
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30 | sleep 1;
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31 | echo "< PID $$ done"' &
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32 |
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33 | sleep 0.5
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34 | local pid=$(cat _tmp/pid.txt)
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35 | echo "killing $pid"
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36 | kill -TERM $pid
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37 | wait
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38 | echo status=$?
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39 | }
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40 |
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41 | sigterm() {
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42 | echo "sigterm [$@] $?"
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43 | # quit the process -- otherwise we resume!
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44 | exit
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45 | }
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46 |
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47 | child() {
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48 | trap 'sigterm x y' SIGTERM
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49 | echo child
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50 | for i in $(seq 5); do
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51 | sleep 1
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52 | done
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53 | }
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54 |
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55 |
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56 | readonly SH=bash
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57 | #readonly SH=dash # bad trap
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58 | #readonly SH=mksh
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59 | #readonly SH=zsh
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60 |
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61 | child2() {
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62 | $SH -c '
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63 | sigterm() {
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64 | echo "sigterm [$@] $?"
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65 | # quit the process -- otherwise we resume!
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66 | exit
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67 | }
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68 |
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69 | trap "sigterm x y" SIGTERM
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70 | trap -p
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71 | echo child
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72 | for i in $(seq 5); do
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73 | sleep 1
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74 | done
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75 | ' &
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76 | }
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77 |
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78 | start-and-kill() {
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79 | $0 child &
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80 |
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81 | #child2
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82 |
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83 | echo "started $!"
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84 | sleep 0.1 # a little race to allow things to be printed
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85 |
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86 | # NOTE: The process only dies after one second. The "sleep 1" is run until
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87 | # completion, and then the signal handler is run, which calls "exit".
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88 |
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89 | echo "killing $!"
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90 | kill -s SIGTERM $!
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91 | wait $!
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92 | echo status=$?
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93 | }
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94 |
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95 | num_signals=0
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96 |
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97 | ignore-n-times() {
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98 | (( num_signals++ ))
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99 |
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100 | if [[ $num_signals -le 2 ]]; then
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101 | echo "Received signal $num_signals -- IGNORING"
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102 | else
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103 | echo "Removing this signal handler; next one will be the default"
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104 | trap - TERM
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105 | fi
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106 | }
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107 |
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108 | # In bash: Run this and hit Ctrl-C four times to see the handler in action!
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109 | #
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110 | # NOTE: Ctrl-C doesn't work in Python because Python does stuff with SIGINT!
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111 | # We could disable KeyboardInterrupt entirely in the OVM build? But still need
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112 | # the signal module!
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113 |
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114 | sleep-and-ignore() {
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115 | trap ignore-n-times TERM
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116 | for i in $(seq 10); do
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117 | echo $i
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118 | sleep 0.2
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119 | done
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120 | }
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121 |
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122 | # NOTE: osh has EINTR problems here!
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123 | #
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124 | # File "/home/andy/git/oilshell/oil/bin/../core/process.py", line 440, in WaitUntilDone
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125 | # if not waiter.Wait():
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126 | # File "/home/andy/git/oilshell/oil/bin/../core/process.py", line 632, in Wait
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127 | # pid, status = os.wait()
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128 | # OSError: [Errno 4] Interrupted system call
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129 |
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130 | kill-sleep-and-ignore() {
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131 | sleep-and-ignore &
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132 | local last_pid=$!
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133 |
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134 | echo "Started $last_pid"
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135 |
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136 | # Hm sometimes the signal gets ignored? You can't just kill it 3 times?
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137 | for i in $(seq 5); do
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138 | kill -s SIGTERM $last_pid
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139 | echo kill status=$?
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140 | sleep 0.1
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141 | done
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142 |
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143 | wait
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144 | echo wait status=$?
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145 | }
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146 |
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147 | "$@"
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148 |
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