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authorDenys Vlasenko2016-10-02 17:39:31 +0200
committerDenys Vlasenko2016-10-02 17:39:31 +0200
commit5d6b8729ed7335c702022f4f3176573f4cf2cf5a (patch)
treebef985dae4fb3ea41e1a478a848d19039b0e5d8f /shell/hush_test/hush-signals/sigint1.tests
parent888527cceec2f58f1eae3acceddee928b5cb647a (diff)
downloadbusybox-5d6b8729ed7335c702022f4f3176573f4cf2cf5a.zip
busybox-5d6b8729ed7335c702022f4f3176573f4cf2cf5a.tar.gz
hush testsuite: add many tests from ash testsuite
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
+# (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