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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - lldb not sending SIGINT to inferior process"
href="https://llvm.org/bugs/show_bug.cgi?id=28989">28989</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>lldb not sending SIGINT to inferior process
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>penryu@apple.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16958" name="attach_16958" title="Source file main.c used to reproduce issue">attachment 16958</a> <a href="attachment.cgi?id=16958&action=edit" title="Source file main.c used to reproduce issue">[details]</a></span>
Source file main.c used to reproduce issue
When lldb connects to a previously launchd process via pid, issuing ^C (Ctrl-C)
in the tty of the inferior process correctly sends SIGINT to the inferior
process. At this point, commands to `process handle SIGINT ...` can be used to
route the signal as the user wants.
However, if the inferior process is launched by lldb itself, either via `lldb
./some_bin` at the command line, or via `target create ...` from within lldb;
Ctrl-C is only received by lldb, and cannot be forwarded to the inferior
process as a SIGINT.
Note that sending a SIGINT to the debugged process with kill(1) or kill(2) will
work, but is only a workaround.
= Produce executable from attached source =
$ clang -g -o main main.c
= Attach to pid =
# launch ./main in separate tty
(lldb) pr at -p NNNNN
(lldb) pr ha SIGINT -p true -s false
(lldb) c
# issue ^C in tty running ./main
# ./main process exits via custom handler as intended
= Launch from inside lldb =
$ lldb
(lldb) ta cr ./main
(lldb) br s -n main
(lldb) r
Process NNNNN stopped ... stop reason = signal SIGSTOP
[...]
(lldb) pr ha SIGINT -p true -s false
(lldb) c
^C
Process NNNNN stopped ... stop reason = signal SIGSTOP
[...]
# ^C never results in a SIGINT to inferior process</pre>
</div>
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