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Mark the automatically attached child with PL_FLAG_CHILD in struct

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lwpinfo flags, for PT_FOLLOWFORK auto-attachment.

In collaboration with:	Dmitry Mikulin <dmitrym juniper net>
MFC after:	 1 week
This commit is contained in:
Konstantin Belousov 2012-02-10 00:02:13 +00:00
parent 3e7cc3cab3
commit db3273398b
4 changed files with 6 additions and 0 deletions
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2
sys/kern/kern_fork.c
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@ -1035,7 +1035,9 @@ fork_return(struct thread *td, struct trapframe *frame)
p->p_oppid = p->p_pptr->p_pid;
proc_reparent(p, dbg);
sx_xunlock(&proctree_lock);
td->td_dbgflags |= TDB_CHILD;
ptracestop(td, SIGSTOP);
td->td_dbgflags &= ~TDB_CHILD;
} else {
/*
* ... otherwise clear the request.

2
sys/kern/sys_process.c
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@ -1145,6 +1145,8 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
pl->pl_flags |= PL_FLAG_FORKED;
pl->pl_child_pid = td2->td_dbg_forked;
}
if (td2->td_dbgflags & TDB_CHILD)
pl->pl_flags |= PL_FLAG_CHILD;
pl->pl_sigmask = td2->td_sigmask;
pl->pl_siglist = td2->td_siglist;
strcpy(pl->pl_tdname, td2->td_name);

1
sys/sys/proc.h
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@ -384,6 +384,7 @@ do { \
process */
#define TDB_STOPATFORK 0x00000080 /* Stop at the return from fork (child
only) */
#define TDB_CHILD 0x00000100 /* New child indicator for ptrace() */
/*
* "Private" flags kept in td_pflags:

1
sys/sys/ptrace.h
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@ -107,6 +107,7 @@ struct ptrace_lwpinfo {
#define PL_FLAG_EXEC 0x10 /* exec(2) succeeded */
#define PL_FLAG_SI 0x20 /* siginfo is valid */
#define PL_FLAG_FORKED 0x40 /* new child */
#define PL_FLAG_CHILD 0x80 /* I am from child */
sigset_t pl_sigmask; /* LWP signal mask */
sigset_t pl_siglist; /* LWP pending signal */
struct __siginfo pl_siginfo; /* siginfo for signal */