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<HTML
><HEAD
><TITLE
>kill</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"></HEAD
><BODY
CLASS="REFENTRY"
><H1
><A
NAME="AEN1"
>kill</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN6"
></A
><H2
>Name</H2
>kill -- (OBSOLETE, REMOVED) send signal to a process</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN9"
></A
><H2
>Synopsis</H2
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
> #include <sys/types.h>
#include <signal.h>
int <TT
CLASS="FUNCTION"
>kill</TT
> pid_t <TT
CLASS="PARAMETER"
><I
>pid</I
></TT
>, int sig);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN13"
></A
><H2
>DESCRIPTION</H2
><P
> OBSOLETE and REMOVED. USE
PTHREAD_KILL. The <TT
CLASS="FUNCTION"
>kill</TT
> system can be used to
send any signal to any process group or process. In RTLinux there is
a single process and a single process group for each processor. The
process group and the process identifier for that processor is the cpu
number + 1 (so that we can handle the stupid 0 convention described
below).</P
><P
>If <TT
CLASS="PARAMETER"
><I
>pid</I
></TT
> is positive, then signal
<TT
CLASS="PARAMETER"
><I
>sig</I
></TT
> is sent to <TT
CLASS="PARAMETER"
><I
>pid</I
></TT
>.</P
><P
>If <TT
CLASS="PARAMETER"
><I
>pid</I
></TT
> equals 0, then
<TT
CLASS="PARAMETER"
><I
>sig</I
></TT
> is sent to every process in the process
group of the current process. This is equivalent to sending the signal
to the current process in RTLinux.</P
><P
>If <TT
CLASS="PARAMETER"
><I
>pid</I
></TT
> equals -1, then
<TT
CLASS="PARAMETER"
><I
>sig</I
></TT
> is sent to every process except for the
first one, from higher numbers in the process table to lower.</P
><P
>If <TT
CLASS="PARAMETER"
><I
>pid</I
></TT
> is less than -1, then
<TT
CLASS="PARAMETER"
><I
>sig</I
></TT
> is sent to every process in the process
group <TT
CLASS="PARAMETER"
><I
>-pid</I
></TT
>.</P
><P
>If <TT
CLASS="PARAMETER"
><I
>sig</I
></TT
> is 0, then no signal is sent, but error
checking is still performed.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN33"
></A
><H2
>RETURN VALUE</H2
><P
>On success, zero is returned. On error, -1 is returned, and errno is set
appropriately.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN36"
></A
><H2
>ERRORS</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>EINVAL</DT
><DD
><P
>An invalid signal was specified.</P
></DD
><DT
>ESRCH</DT
><DD
><P
>The <TT
CLASS="PARAMETER"
><I
>pid</I
></TT
> or
process group does not exit. Note that an existing process might be a
zombie -- a process which already committed termination, but has not
yet been <TT
CLASS="FUNCTION"
>wait()</TT
>ed for.</P
></DD
><DT
>EPERM</DT
><DD
><P
>The process does not have
permission to send the signal to any of the receiving processes. For
a process to have permission to send a signal to process
<TT
CLASS="PARAMETER"
><I
>pid</I
></TT
>, it must either have root privileges, or
the real or effective user ID of the sending process must equal the
real or saved set-user-ID of the receiving process.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN54"
></A
><H2
>BUGS</H2
><P
>It is impossible to send a signal to task number one, the init
process, for which it has not installed a signal handler. This is
done to assure the system is not brought down accidentally.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN57"
></A
><H2
>NOTES</H2
><P
>In RTLinux, process number one is not special--it is just the process
on processor 0. In a single processor system this is the only process
identifier.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN60"
></A
><H2
>CONFORMING TO</H2
><P
>SVr4, SVID, POSIX.1, X/OPEN, BSD 4.3</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN63"
></A
><H2
>SEE ALSO</H2
><A
HREF="../susv2/xsh/exit.html"
TARGET="_top"
>UNIX spec exit(2)</A
>, <A
HREF="../susv2/xsh/exit.html"
TARGET="_top"
>UNIX spec exit(3)</A
>, <A
HREF="../susv2/xsh/signal.html"
TARGET="_top"
>UNIX spec signal(2)</A
>, <A
HREF="../susv2/xsh/signal.html"
TARGET="_top"
>UNIX spec signal(7)</A
><P
>2001 FSMLabs Inc.</P
><P
>All rights reserved.</P
></DIV
></BODY
></HTML
>
|
