Date: Wed, 30 Dec 2015 00:04:58 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r292896 - head/lib/libc/sys Message-ID: <201512300004.tBU04wb8037478@repo.freebsd.org>
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Author: jhb Date: Wed Dec 30 00:04:57 2015 New Revision: 292896 URL: https://svnweb.freebsd.org/changeset/base/292896 Log: Document the recently added support for ptrace(2) LWP events. Modified: head/lib/libc/sys/ptrace.2 Modified: head/lib/libc/sys/ptrace.2 ============================================================================== --- head/lib/libc/sys/ptrace.2 Wed Dec 30 00:04:33 2015 (r292895) +++ head/lib/libc/sys/ptrace.2 Wed Dec 30 00:04:57 2015 (r292896) @@ -2,7 +2,7 @@ .\" $NetBSD: ptrace.2,v 1.2 1995/02/27 12:35:37 cgd Exp $ .\" .\" This file is in the public domain. -.Dd October 20, 2015 +.Dd December 29, 2015 .Dt PTRACE 2 .Os .Sh NAME @@ -372,6 +372,20 @@ The flag is set for first event reported automatically attached due to .Dv PT_FOLLOW_FORK enabled. +.It PL_FLAG_BORN +This flag is set for the first event reported from a new LWP when LWP +events are enabled via +.Dv PT_LWP_EVENTS . +It is reported along with +.Dv PL_FLAG_SCX +and is always reported if LWP events are enabled. +.It PL_FLAG_EXITED +This flag is set for the last event reported by an exiting LWP when +LWP events are enabled via +.Dv PT_LWP_EVENTS . +Note that this event is not reported when the last LWP in a process exits. +The termination of the last thread is reported via a normal process exit +event. .El .It pl_sigmask The current signal mask of the LWP @@ -463,6 +477,29 @@ Child processes do not inherit this prop The traced process will set the .Dv PL_FLAG_FORKED flag upon exit from a system call that creates a new process. +.It PT_LWP_EVENTS +This request controls tracing of LWP creation and destruction. +If +.Fa data +is non-zero, +then LWPs will stop to report creation and destruction events. +If +.Fa data +is zero, +then LWP creation and destruction events will not be reported. +By default, tracing is not enabled for LWP events. +Child processes do not inherit this property. +New LWPs will stop to report an event with +.Dv PL_FLAG_BORN +set before executing their first instruction. +Exiting LWPs will stop to report an event with +.Dv PL_FLAG_EXITED +set before completing their termination. +.Pp +Note that new processes do not report an event for the creation of their +initial thread, +and exiting processes do not report an event for the termination of the +last thread. .It PT_VM_TIMESTAMP This request returns the generation number or timestamp of the memory map of the traced process as the return value fromhome | help
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