mirror of https://github.com/mkerrisk/man-pages
109 lines
3.0 KiB
Groff
109 lines
3.0 KiB
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" Copyright (C) 2008 Michael Kerrisk <tmk.manpages@gmail.com>
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.\" and Copyright 2003 Abhijit Menon-Sen <ams@wiw.org>
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" 2004-05-31, added tgkill, ahu, aeb
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.\" 2008-01-15 mtk -- rewote DESCRIPTION
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.\"
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.TH TKILL 2 2008-10-01 "Linux" "Linux Programmer's Manual"
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.SH NAME
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tkill, tgkill \- send a signal to a thread
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.SH SYNOPSIS
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.nf
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.BI "int tkill(int " tid ", int " sig );
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.sp
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.BI "int tgkill(int " tgid ", int " tid ", int " sig );
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.fi
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.SH DESCRIPTION
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.BR tgkill ()
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sends the signal
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.I sig
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to the thread with the thread ID
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.I tid
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in the thread group
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.IR tgid .
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(By contrast,
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.BR kill (2)
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can only be used to send a signal to a process (i.e., thread group)
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as a whole, and the signal will be delivered to an arbitrary
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thread within that process.)
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.BR tkill ()
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is an obsolete predecessor to
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.BR tgkill ().
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It only allows the target thread ID to be specified,
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which may result in the wrong thread being signaled if a thread
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terminates and its thread ID is recycled.
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Avoid using this system call.
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If
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.I tgid
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is specified as \-1,
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.BR tgkill ()
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is equivalent to
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.BR tkill ().
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These are the raw system call interfaces, meant for internal
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thread library use.
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.SH "RETURN VALUE"
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On success, zero is returned.
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On error, \-1 is returned, and \fIerrno\fP
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is set appropriately.
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.SH ERRORS
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.TP
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.B EINVAL
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An invalid thread ID, thread group ID, or signal was specified.
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.TP
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.B EPERM
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Permission denied.
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For the required permissions, see
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.BR kill (2).
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.TP
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.B ESRCH
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No process with the specified thread ID (and thread group ID) exists.
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.SH VERSIONS
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.BR tkill ()
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is supported since Linux 2.4.19 / 2.5.4.
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.BR tgkill ()
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was added in Linux 2.5.75.
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.SH "CONFORMING TO"
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.BR tkill ()
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and
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.BR tgkill ()
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are Linux-specific and should not be used
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in programs that are intended to be portable.
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.SH NOTES
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See the description of
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.B CLONE_THREAD
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in
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.BR clone (2)
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for an explanation of thread groups.
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Glibc does not provide wrappers for these system calls; call them using
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.BR syscall (2).
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.SH "SEE ALSO"
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.BR clone (2),
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.BR gettid (2),
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.BR kill (2)
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