diff options
| -rw-r--r-- | misc-utils/kill.1 | 100 |
1 files changed, 52 insertions, 48 deletions
diff --git a/misc-utils/kill.1 b/misc-utils/kill.1 index dd1b1eead..0d430ef17 100644 --- a/misc-utils/kill.1 +++ b/misc-utils/kill.1 @@ -1,40 +1,44 @@ .\" Copyright 1994 Salvatore Valente (svalente@mit.edu) .\" Copyright 1992 Rickard E. Faith (faith@cs.unc.edu) .\" May be distributed under the GNU General Public License -.TH KILL 1 "March 2013" "util-linux" "User Commands" +.TH KILL 1 "July 2014" "util-linux" "User Commands" .SH NAME kill \- terminate a process .SH SYNOPSIS .B kill -.RB [ \-s -.IR signal | \fB\-p\fP ] +.RB [ \- \fIsignal\fR| \-s +.IR signal | \fB-p\fP ] .RB [ \-q -.IR sigval ] +.IR value ] .RB [ \-a ] .RB [ \-\- ] -.IR pid|name ... +.IR pid | name ... .br -.B kill -l -.RI [ signal ] +.B kill \-l +.RI [ number ] +.RB "| " \-L .SH DESCRIPTION The command .B kill -sends the specified signal to the specified process or process group. If no -signal is specified, the TERM signal is sent. The TERM signal will kill -processes which do not catch this signal. For other processes, it may be -necessary to use the KILL (9) signal, since this signal cannot be caught. +sends the specified \fIsignal\fR to the specified processes or process groups. +If no signal is specified, the TERM signal is sent. This TERM signal will kill +processes that do not catch it; for other processes it may be necessary to use +the KILL signal (number 9), since this signal cannot be caught. .PP Most modern shells have a builtin kill function, with a usage rather similar to -that of the command described here. The \-\-all, \-\-pid, and \-\-queue options, -and the possibility to specify processes by command name are a local extension. +that of the command described here. The +.BR \-\-all , +.BR \-\-pid ", and" +.BR \-\-queue +options, and the possibility to specify processes by command name, are local extensions. .PP -If sig is 0, then no signal is sent, but error checking is still performed. -.SH OPTIONS +If \fIsignal\fR is 0, then no actual signal is sent, but error checking is still performed. + +.SH ARGUMENTS +The list of processes to be signaled can be a mixture of names and pids. .TP -.IR pid ... -Specify the list of processes that -.B kill -should signal. Each +.I pid +Each .I pid can be one of four things: .RS @@ -44,13 +48,13 @@ where .I n is larger than 0. The process with pid .I n -will be signaled. +is signaled. .TP .B 0 All processes in the current process group are signaled. .TP .B -1 -All processes with pid larger than 1 will be signaled. +All processes with a pid larger than 1 are signaled. .TP .BI - n where @@ -58,25 +62,26 @@ where is larger than 1. All processes in process group .I n are signaled. When an argument of the form '-n' is given, and it is meant to -denote a process group, either the signal must be specified first, or the +denote a process group, either a signal must be specified first, or the argument must be preceded by a '--' option, otherwise it will be taken as the signal to send. .RE .TP .I name -All processes invoked using that name will be signaled. +All processes invoked using this \fIname\fR will be signaled. + +.SH OPTIONS .TP \fB\-s\fR, \fB\-\-signal\fR \fIsignal\fR -Specify the signal to send. The signal may be given as a signal name or -number. +The signal to send. It may be given as a name or a number. .TP -\fB\-l\fR, \fB\-\-list\fR [\fIsignal\fR] -Print a list of signal names, or convert signal given as argument to a name. -The signals are found in +\fB\-l\fR, \fB\-\-list\fR [\fInumber\fR] +Print a list of signal names, or convert the given signal number to a name. +The signals can be found in .I /usr/\:include/\:linux/\:signal.h .TP \fB\-L\fR, \fB\-\-table\fR -Similar to \-l, but will print signal names and their corresponding +Similar to \fB\-l\fR, but it will print signal names and their corresponding numbers. .TP \fB\-a\fR, \fB\-\-all\fR @@ -84,47 +89,46 @@ Do not restrict the commandname-to-pid conversion to processes with the same uid as the present process. .TP \fB\-p\fR, \fB\-\-pid\fR -Specify that -.B kill -should only print the process id (pid) of the named processes, and not send any +Only print the process id (pid) of the named processes, do not send any signals. .IP -The \-\-pid option functionality is also enabled when the command -copied or linked to name +The \fB\-\-pid\fR option is automatically enabled when the \fBkill\fR command +is invoked with the name of .BR pid . -This functionality is deprecated, and will not be removed in March 2016. +This functionality is deprecated, and will be removed in March 2016. .TP -\fB\-q\fR, \fB\-\-queue\fR \fIsigval\fR +\fB\-q\fR, \fB\-\-queue\fR \fIvalue\fR Use .BR sigqueue (2) rather than -.BR kill (2) -and the -.I sigval -argument is used to specify an integer to be sent with the signal. If the +.BR kill (2). +The +.I value +argument is an integer that is sent along with the signal. If the receiving process has installed a handler for this signal using the SA_SIGINFO flag to .BR sigaction (2), -then it can obtain this data via the si_value field of the siginfo_t structure. +then it can obtain this data via the si_sigval field of the siginfo_t structure. + .SH NOTES -It is not possible to send a signal to explicitly selected thread in a -multithreaded process by +It is not possible to send a signal to an explicitly selected thread in a +multithreaded process using the .BR kill (2) syscall. If .BR kill(2) -is used to send a signal to a thread group, then kernel selects arbitrary +is used to send a signal to a thread group, then the kernel selects an arbitrary member of the thread group that has not blocked the signal. For more details see -.BR clone (2) -CLONE_THREAD description. +.BR clone (2), +the CLONE_THREAD description. .PP The command .BR kill (1) as well as syscall .BR kill (2) -accepts TID (thread ID, see +accept a TID (thread ID, see .BR gettid (2)) -as argument. In this case the kill behavior is not changed and the signal is +as an argument. In this case the kill behavior is not changed and the signal is also delivered to the thread group rather than to the specified thread. .SH RETURN CODES |