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- Proper locking for p_tracep and p_traceflag.

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- Catch up to new ktrace API.
This commit is contained in:
John Baldwin 2002-06-07 05:42:25 +00:00
parent 6c84de02e0
commit af300f2367
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=97998
1 changed files with 7 additions and 7 deletions
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14
sys/kern/kern_fork.c
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@ -597,15 +597,16 @@ fork1(td, flags, procp)
#ifdef KTRACE
/*
* Copy traceflag and tracefile if enabled. If not inherited,
* these were zeroed above but we still could have a trace race
* so make sure p2's p_tracep is NULL.
* Copy traceflag and tracefile if enabled.
*/
if ((p1->p_traceflag & KTRFAC_INHERIT) && p2->p_tracep == NULL) {
mtx_lock(&ktrace_mtx);
KASSERT(p2->p_tracep == NULL, ("new process has a ktrace vnode"));
if (p1->p_traceflag & KTRFAC_INHERIT) {
p2->p_traceflag = p1->p_traceflag;
if ((p2->p_tracep = p1->p_tracep) != NULL)
VREF(p2->p_tracep);
}
mtx_unlock(&ktrace_mtx);
#endif
/*
@ -861,9 +862,8 @@ fork_return(td, frame)
userret(td, frame, 0);
#ifdef KTRACE
if (KTRPOINT(td->td_proc, KTR_SYSRET)) {
ktrsysret(td->td_proc->p_tracep, SYS_fork, 0, 0);
}
if (KTRPOINT(td, KTR_SYSRET))
ktrsysret(SYS_fork, 0, 0);
#endif
mtx_assert(&Giant, MA_NOTOWNED);
}