[Bug 723] New: Busybox shell doesn't handle SIGHUP properly
bugzilla at busybox.net
bugzilla at busybox.net
Tue Nov 17 21:52:48 UTC 2009
https://bugs.busybox.net/show_bug.cgi?id=723
Summary: Busybox shell doesn't handle SIGHUP properly
Product: Busybox
Version: 1.12.x
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: Other
AssignedTo: unassigned at busybox.net
ReportedBy: a9016009 at gmx.de
CC: busybox-cvs at busybox.net
Estimated Hours: 0.0
Forwarding from https://bugs.maemo.org/show_bug.cgi?id=5317 .
Unsure whether bug 625 is related here.
Also see https://bugs.maemo.org/show_bug.cgi?id=5317 .
SOFTWARE VERSION:
1.2009.41-10
STEPS TO REPRODUCE THE PROBLEM:
1. Open XTerm
2. Type and execute several commands
3. Exit XTerm
4. Open XTerm
5. Press UP arrow button
EXPECTED OUTCOME:
You should see the command you last typed at step #2.
ACTUAL OUTCOME:
Command history is empty.
REPRODUCIBILITY:
always
OTHER COMMENTS:
This may be indirectly related to the patch that was applied in Maemo to fix
https://bugs.busybox.net/show_bug.cgi?id=185 (if ash didn't save history when
killed before that no one would notice) - still in NEW state here.
------- Comment #9 From Tamminen Eero (Nokia) 2009-11-10 17:30:34 -------
Ctrl-d saves command history, as expected.
Killing X-term wiht "X" button does not, as that's done by XTerm to Busybox
when the window is closed, according to strace:
# strace -f -p 2117
Process 2117 attached - interrupt to quit
read(0, 0xbe83d1cf, 1) = ? ERESTARTSYS (To be restarted)
--- SIGHUP (Hangup) @ 0 (0) ---
Process 2117 detached
Seems like Busybox shell doesn't handle SIGHUP properly. I.e. set some flag in
signal handler and in main loop exit gracefully (with history saving) when the
signal delivery interrupts its select() syscall.
(Other way to safely notify the main thread about the async signal delivery
would be using a pipe added to select(), but that's a bit of an overkill.)
WORKAROUND:
Setting trap handler in .profile
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