mirror of
https://https.git.savannah.gnu.org/git/bash.git
synced 2026-06-21 21:07:57 +02:00
Chet Ramey
85 lines
2.8 KiB
Plaintext
85 lines
2.8 KiB
Plaintext
# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# return with argument in trap string while function is executing
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trap 'echo BASH_TRAPSIG = $(kill -l $BASH_TRAPSIG); return 7' USR1
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func() { kill -USR1 $$; }
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func
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echo func=$?
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# test where return with no argument in a trap string gets its exit status
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# when a function is executing (posix interp 1602)
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setexit() { return "$1"; }
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# function called in trap string to set $?
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# posix interp 1602: the return in the trap string causees the end of
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# execution of the trap action
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trap 'setexit 222; echo $? ; return' USR1
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process() { kill -USR1 $$; }
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process
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echo exit=$?
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unset -f process
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# posix interp 1602; the return in the trap string interrupts loop and causes
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# the end of execution of the trap action
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trap 'setexit 123; return' USR1
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loop() { while :; do :; done; }
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get_loop_exit() { loop; echo "exit=$?"; }
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{ sleep 1; kill -USR1 $$; } &
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get_loop_exit
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unset -f loop get_loop_exit
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# posix interp 1602; the return in `check' does not cause the end of execution
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# of the trap action
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check() { false; return; }
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handle() { check && echo B || echo A; }
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trap handle USR1
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kill -USR1 $$
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unset -f check handle
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# posix interp 1602: show where we get the value of $? for trap actions
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# return in trap string causes end of execution of trap action
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invoke() { kill -USR1 $$; return 222; }
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trap 'setexit 111; return' USR1
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invoke
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case $? in
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(0) echo 'In trap-argument: last command preceding the trap action' ;;
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(111) echo 'In trap-argument: last command in the trap action' ;;
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(222) echo 'In trap-argument: (failed to exit the function)' ;;
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(*) echo 'In trap-argument: (unexpected)' ;;
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esac
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# return in `handler' does not cause the end of execution of the trap action
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stat=99
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handler() { setexit 111; return; }
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trap 'handler; stat=$?; return' USR1
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invoke
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case $stat in
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(0) echo 'In a function call: last command preceding the trap action' ;;
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(111) echo 'In a function call: last command in the trap action' ;;
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(*) echo 'In a function call: (unexpected)' ;;
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esac
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unset -f invoke handler
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unset -f setexit
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# posix interp 1602: return in function does not cause end of trap action
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ReturnFalse()
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{
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false ; return
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}
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trap 'ReturnFalse && echo "woops"' EXIT
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(exit 0) # set exit status
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