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TKILL(2) Linux Programmer's Manual TKILL(2)
NAME
tkill, tgkill - send a signal to a single process
SYNOPSIS
#include <sys/types.h>
#include <linux/unistd.h>
#include <errno.h>
_syscall2(int, tkill, int, tid, int, sig)
/* Using syscall(2) may be preferable; see intro(2) */
int tkill(int tid, int sig);
_syscall3(int, tgkill, int, tgid, int, tid, int, sig)
/* Using syscall(2) may be preferable; see intro(2) */
int tgkill(int tgid, int tid, int sig);
DESCRIPTION
The tkill() system call is analogous to kill(2), except when the speci-
fied process is part of a thread group (created by specifying the
CLONE_THREAD flag in the call to clone). Since all the processes in a
thread group have the same PID, they cannot be individually signalled
with kill(). With tkill(), however, one can address each process by
its unique TID.
The tgkill() call improves on tkill() by allowing the caller to specify
the thread group ID of the thread to be signalled, protecting against
TID reuse. If the tgid is specified as -1, tgkill() degenerates into
tkill().
These are the raw system call interfaces, meant for internal thread
library use.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.
ERRORS
EINVAL An invalid TID or signal was specified.
EPERM Permission denied. For the required permissions, see kill(2).
ESRCH No process with the specified thread ID (and thread group ID)
exists.
CONFORMING TO
tkill() and tgkill() are Linux specific and should not be used in pro-
grams that are intended to be portable.
VERSIONS
tkill() is supported since Linux 2.4.19 / 2.5.4. tgkill() was added in
Linux 2.5.75.
SEE ALSO
gettid(2), kill(2)
Linux 2.6.6 2004-05-31 TKILL(2)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Sat Sep 8 16:35:34 GMT 2007
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