From 5d6b8729ed7335c702022f4f3176573f4cf2cf5a Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sun, 2 Oct 2016 17:39:31 +0200 Subject: hush testsuite: add many tests from ash testsuite Signed-off-by: Denys Vlasenko --- shell/hush_test/hush-signals/sigint1.tests | 41 ++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100755 shell/hush_test/hush-signals/sigint1.tests (limited to 'shell/hush_test/hush-signals/sigint1.tests') diff --git a/shell/hush_test/hush-signals/sigint1.tests b/shell/hush_test/hush-signals/sigint1.tests new file mode 100755 index 000000000..3d483d32a --- /dev/null +++ b/shell/hush_test/hush-signals/sigint1.tests @@ -0,0 +1,41 @@ +# 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 +# (The complex command is necessary only if SIGINT is generated by ^C, +# in this testcase even bare "sleep 2" would do because +# in the testcase 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 -- cgit v1.2.3