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authorDenys Vlasenko2011-02-21 03:22:20 +0100
committerDenys Vlasenko2011-02-21 03:22:20 +0100
commitb12553faa8991e11c11f70a81f1d9d44078c7645 (patch)
tree4154d5308a9bad6bb46e2014cb6cc997dc9a92cd /shell/hush_test/hush-misc/sigint1.tests
parent55988aed472d9cd362f9a50f4999b5e47ca33abe (diff)
downloadbusybox-b12553faa8991e11c11f70a81f1d9d44078c7645.zip
busybox-b12553faa8991e11c11f70a81f1d9d44078c7645.tar.gz
ash: fix ash-signals/signal8 testcase failure
function old new delta killcmd 109 224 +115 kill_main 882 910 +28 changepath 194 195 +1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 144/0) Total: 144 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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+# What should happen if non-interactive shell gets SIGINT?
+
+(sleep 1; echo Sending SIGINT to main shell PID; exec kill -INT $$) &
+
+# We create a child which exits with 0 even on SIGINT
+# (This is truly necessary only if SIGINT is generated by ^C,
+# in this testcase even bare "sleep 2" would do because
+# we don't send SIGINT _to_ the_ child_...)
+$THIS_SH -c 'trap "exit 0" SIGINT; sleep 2'
+
+# In one second, we (main shell) get SIGINT here.
+# The question is whether we should, or should not, exit.
+
+# bash will not stop here. It will execute next command(s).
+
+# The rationale for this is described here:
+# http://www.cons.org/cracauer/sigint.html
+#
+# Basically, bash will not exit on SIGINT immediately if it waits
+# for a child. It will wait for the child to exit.
+# If child exits NOT by dying on SIGINT, then bash will not exit.
+#
+# The idea is that the following script:
+# | emacs file.txt
+# | more cmds
+# User may use ^C to interrupt editor's ops like search. But then
+# emacs exits normally. User expects that script doesn't stop.
+#
+# This is a nice idea, but detecting "did process really exit
+# with SIGINT?" is racy. Consider:
+# | bash -c 'while true; do /bin/true; done'
+# When ^C is pressed while bash waits for /bin/true to exit,
+# it may happen that /bin/true exits with exitcode 0 before
+# ^C is delivered to it as SIGINT. bash will see SIGINT, then
+# it will see that child exited with 0, and bash will NOT EXIT.
+
+# Therefore we do not implement bash behavior.
+# I'd say that emacs need to put itself into a separate pgrp
+# to isolate shell from getting stray SIGINTs from ^C.
+
+echo Next command after SIGINT was executed