Name
tkill, tgkill — send a signal to a thread
Synopsis
int
tkill( |
int tid, |
int sig); |
int
tgkill( |
int tgid, |
| int tid, | |
int sig); |
![[Note]](../stylesheet/note.png) |
Note |
|---|---|
| There are no glibc wrappers for these system calls; see NOTES. |
DESCRIPTION
tgkill() sends the signal
sig to the thread
with the thread ID tid in the thread group
tgid. (By contrast,
kill(2) can be used to send
a signal only to a process (i.e., thread group) as a whole,
and the signal will be delivered to an arbitrary thread
within that process.)
tkill() is an obsolete
predecessor to tgkill(). It
allows only the target thread ID to be specified, which may
result in the wrong thread being signaled if a thread
terminates and its thread ID is recycled. Avoid using this
system call.
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 thread ID, thread group ID, 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 programs that are intended to be portable.
NOTES
See the description of CLONE_THREAD in clone(2) for an explanation
of thread groups.
Glibc does not provide wrappers for these system calls; call them using syscall(2).
COLOPHON
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (C) 2008 Michael Kerrisk <tmk.manpagesgmail.com> and Copyright 2003 Abhijit Menon-Sen <amswiw.org> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END 2004-05-31, added tgkill, ahu, aeb 2008-01-15 mtk -- rewrote DESCRIPTION |