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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Breakpoint in child process (after fork) hangs the child"
href="https://llvm.org/bugs/show_bug.cgi?id=30983">30983</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Breakpoint in child process (after fork) hangs the child
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<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>simon.kagstrom@netinsight.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I'm afraid I'm using LLDB on OSX Sierra, not built from source.
I'm experiencing a problem when setting breakpoints which are hit by a child
process after a fork. A simple example to trigger the problem can be found
below.
If I set a breakpoint on the "printf("In child\n");" statement, the child
process will hit it without reporting to the parent, and then simply hang there
(so that the printout is never seen).
I assume this is because the breakpoints aren't being reported back to LLDB, as
in <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - equivilent of gdb's follow-fork-mode child"
href="show_bug.cgi?id=17972">Bug 17972</a>. If follow-fork mode won't be implemented, then at least perhaps
breakpoints can be cleared for the child?
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/user.h>
#include <sys/types.h>
#include <sys/wait.h>
int main(int argc, const char *argv[])
{
pid_t child;
child = fork();
if (child < 0)
{
printf("Error\n");
}
else if (child == 0)
{
printf("In child\n"); // Breakpoint here is bad news!
}
else
{
int status;
printf("In parent, child %d\n", child);
wait(&status);
}
return 0;
}</pre>
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