https://llvm.org/bugs/show_bug.cgi?id=30983
Bug ID: 30983
Summary: Breakpoint in child process (after fork) hangs the
child
Product: lldb
Version: unspecified
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
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 Bug 17972. 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;
}
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