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prctl.2: Clarify that prctl can apply to threads 

The current synopsis for prctl(2) misleadingly claims that prctl
operates on a process.  Rather, some (in fact, most) prctls operate
on a thread.

The wording probably dates back to the old days when Linux didn't
really have threads at all.

Reword as appropriate.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Dave Martin 2020-05-12 17:36:46 +01:00 committed by Michael Kerrisk
parent 3f1dc8e16a
commit 1e0d99b899
1 changed files with 5 additions and 1 deletions
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6
man2/prctl.2
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@ -53,7 +53,7 @@
.\" .\"
.TH PRCTL 2 2020-04-11 "Linux" "Linux Programmer's Manual" .TH PRCTL 2 2020-04-11 "Linux" "Linux Programmer's Manual"
.SH NAME .SH NAME
prctl \- operations on a process prctl \- operations on a process or thread
.SH SYNOPSIS .SH SYNOPSIS
.nf .nf
.B #include <sys/prctl.h> .B #include <sys/prctl.h>
@ -63,6 +63,10 @@ prctl \- operations on a process
.fi .fi
.SH DESCRIPTION .SH DESCRIPTION
.BR prctl () .BR prctl ()
manipulates various aspects of the behavior
of the calling thread or process.
.PP
.BR prctl ()
is called with a first argument describing what to do is called with a first argument describing what to do
(with values defined in \fI<linux/prctl.h>\fP), and further (with values defined in \fI<linux/prctl.h>\fP), and further
arguments with a significance depending on the first one. arguments with a significance depending on the first one.