Date: Tue, 5 Nov 2013 19:54:13 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r257716 - stable/9/lib/libc/sys Message-ID: <201311051954.rA5JsDQ5015891@svn.freebsd.org>
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Author: jhb Date: Tue Nov 5 19:54:13 2013 New Revision: 257716 URL: http://svnweb.freebsd.org/changeset/base/257716 Log: MFC 253656: Enhance the description of NOTE_TRACK: - NOTE_TRACK has never triggered a NOTE_TRACK event from the parent pid. If NOTE_FORK is set, the listener will get a NOTE_FORK event from the parent pid, but not a separate NOTE_TRACK event. - Explicitly note that the event added to monitor the child process preserves the fflags from the original event. - Move the description of NOTE_TRACKERR under NOTE_TRACK as it is not a bit for the user to set (which is what this list pupports to be). Also, explicitly note that if an error occurs, the NOTE_CHILD event will not be generated. Modified: stable/9/lib/libc/sys/kqueue.2 Directory Properties: stable/9/lib/libc/ (props changed) stable/9/lib/libc/sys/ (props changed) Modified: stable/9/lib/libc/sys/kqueue.2 ============================================================================== --- stable/9/lib/libc/sys/kqueue.2 Tue Nov 5 19:49:53 2013 (r257715) +++ stable/9/lib/libc/sys/kqueue.2 Tue Nov 5 19:54:13 2013 (r257716) @@ -388,20 +388,25 @@ The process has called .It NOTE_EXEC The process has executed a new process via .Xr execve 2 -or similar call. +or a similar call. .It NOTE_TRACK Follow a process across .Fn fork calls. -The parent process will return with NOTE_TRACK set in the +The parent process registers a new kevent to monitor the child process +using the same .Va fflags -field, while the child process will return with NOTE_CHILD set in +as the original event. +The child process will signal an event with NOTE_CHILD set in .Va fflags and the parent PID in .Va data . -.It NOTE_TRACKERR -This flag is returned if the system was unable to attach an event to -the child process, usually due to resource limitations. +.Pp +If the parent process fails to register a new kevent +.Pq usually due to resource limitations , +it will signal an event with NOTE_TRACKERR set in +.Va fflags , +and the child process will not signal a NOTE_CHILD event. .El .Pp On return,
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