mirror of https://github.com/mkerrisk/man-pages
101 lines
2.8 KiB
Groff
101 lines
2.8 KiB
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" Copyright 2003 Abhijit Menon-Sen <ams@wiw.org>
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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.\" manual page may be incorrect or out-of-date.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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.\"
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.TH TKILL 2 2007-06-01 "Linux" "Linux Programmer's Manual"
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.SH NAME
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tkill, tgkill \- send a signal to a single process
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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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The
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.BR tkill ()
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system call is analogous to
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.BR kill (2),
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except when the specified process is part of a thread group
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(created by specifying the
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.B CLONE_THREAD
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flag in the call to
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.BR clone (2)).
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Since all the processes in a thread group have the same PID,
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they cannot be individually signaled with
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.BR kill (2).
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With
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.BR tkill (),
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however, one can address each process
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by its unique TID.
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.PP
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The
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.BR tgkill ()
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call improves on
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.BR tkill ()
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by allowing the caller to
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specify the thread group ID of the thread to be signaled, protecting
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against TID reuse.
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If the tgid is specified as \-1,
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.BR tgkill ()
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degenerates
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into
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.BR tkill ().
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.PP
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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 TID 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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Glibc does not provide wrapper 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 gettid (2),
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.BR kill (2)
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