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Add text explicitly noting that sig==0 can be used to check for 

the existence of a PID or PGID.
Other minor rewordings.
This commit is contained in:
Michael Kerrisk 2008-04-18 15:26:30 +00:00
parent 25c8faf595
commit 0527ad7f3a
1 changed files with 7 additions and 4 deletions
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11
man2/kill.2
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@ -41,7 +41,7 @@
.\" Modified 2004-06-24 by aeb
.\" Modified, 2004-11-30, after idea from emmanuel.colbus@ensimag.imag.fr
.\"
.TH KILL 2 2007-07-26 "Linux" "Linux Programmer's Manual"
.TH KILL 2 2008-04-18 "Linux" "Linux Programmer's Manual"
.SH NAME
kill \- send signal to a process
.SH SYNOPSIS
@ -66,7 +66,8 @@ The
system call
can be used to send any signal to any process group or process.
.PP
If \fIpid\fP is positive, then signal \fIsig\fP is sent to \fIpid\fP.
If \fIpid\fP is positive, then signal \fIsig\fP is sent to the
process with the ID specified by \fIpid\fP.
.PP
If \fIpid\fP equals 0, then \fIsig\fP is sent to every process in the
process group of the calling process.
@ -76,10 +77,12 @@ for which the calling process has permission to send signals,
except for process 1 (\fIinit\fP), but see below.
.PP
If \fIpid\fP is less than \-1, then \fIsig\fP is sent to every process
in the process group \fI\-pid\fP.
in the process group whose ID is \fI\-pid\fP.
.PP
If \fIsig\fP is 0, then no signal is sent, but error checking is still
performed.
performed;
this can be used to check for the existence of a process ID or
process group ID.
For a process to have permission to send a signal
it must either be privileged (under Linux: have the