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perf_event_open.2: Minor fix: place PERF_FLAG_FD_CLOEXEC in alphabetical order 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-04-02 09:36:45 +02:00
parent 4f4f57abc2
commit e9b1ab7892
1 changed files with 14 additions and 14 deletions
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28
man2/perf_event_open.2
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@ -132,6 +132,20 @@ The
.I flags
argument is formed by ORing together zero or more of the following values:
.TP
.BR PERF_FLAG_FD_CLOEXEC " (since Linux 3.14)."
This flag enables the close-on-exec flag for the created
event file descriptor,
so that the file descriptor is automatically closed on
.BR execve (2).
Setting the close-on-exec flags at creation time rather than later with
.BR fcntl (2)
avoids potential race conditions where the calling thread invokes
.BR perf_event_open ()
at the same time as another thread calls
.BR fork (2)
then
.BR execve (2).
.TP
.BR PERF_FLAG_FD_NO_GROUP
.\" FIXME The following sentence is unclear
This flag allows creating an event as part of an event group but
@ -164,20 +178,6 @@ must be passed as the
parameter.
cgroup monitoring is available only
for system-wide events and may therefore require extra permissions.
.TP
.BR PERF_FLAG_FD_CLOEXEC " (since Linux 3.14)."
This flag enables the close-on-exec flag for the created
event file descriptor,
so that the file descriptor is automatically closed on
.BR execve (2).
Setting the close-on-exec flags at creation time rather than later with
.BR fcntl (2)
avoids potential race conditions where the calling thread invokes
.BR perf_event_open ()
at the same time as another thread calls
.BR fork (2)
then
.BR execve (2).
.P
The
.I perf_event_attr