225 lines
4.2 KiB
HTML
225 lines
4.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of TKILL</TITLE>
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</HEAD><BODY>
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<H1>TKILL</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2019-08-02<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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tkill, tgkill - send a signal to a thread
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>int tkill(int </B><I>tid</I><B>, int </B><I>sig</I><B>);</B>
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<B>int tgkill(int </B><I>tgid</I><B>, int </B><I>tid</I><B>, int </B><I>sig</I><B>);</B>
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</PRE>
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<P>
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<I>Note</I>:
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There is no glibc wrapper for
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<B>tkill</B>();
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see NOTES.
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>tgkill</B>()
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sends the signal
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<I>sig</I>
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to the thread with the thread ID
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<I>tid</I>
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in the thread group
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<I>tgid</I>.
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(By contrast,
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<B><A HREF="/cgi-bin/man/man2html?2+kill">kill</A></B>(2)
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can be used to send a signal only 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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<P>
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<B>tkill</B>()
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is an obsolete predecessor to
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<B>tgkill</B>().
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It allows only 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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<P>
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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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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success, zero is returned.
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On error, -1 is returned, and <I>errno</I>
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is set appropriately.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="1"><B>EAGAIN</B>
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<DD>
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The
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<B>RLIMIT_SIGPENDING</B>
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resource limit was reached and
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<I>sig</I>
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is a real-time signal.
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<DT id="2"><B>EAGAIN</B>
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<DD>
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Insufficient kernel memory was available and
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<I>sig</I>
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is a real-time signal.
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<DT id="3"><B>EINVAL</B>
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<DD>
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An invalid thread ID, thread group ID, or signal was specified.
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<DT id="4"><B>EPERM</B>
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<DD>
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Permission denied.
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For the required permissions, see
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<B><A HREF="/cgi-bin/man/man2html?2+kill">kill</A></B>(2).
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<DT id="5"><B>ESRCH</B>
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<DD>
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No process with the specified thread ID (and thread group ID) exists.
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</DL>
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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<B>tkill</B>()
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is supported since Linux 2.4.19 / 2.5.4.
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<B>tgkill</B>()
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was added in Linux 2.5.75.
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<P>
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Library support for
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<B>tgkill</B>()
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was added to glibc in version 2.30.
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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<B>tkill</B>()
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and
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<B>tgkill</B>()
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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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<A NAME="lbAI"> </A>
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<H2>NOTES</H2>
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See the description of
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<B>CLONE_THREAD</B>
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in
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<B><A HREF="/cgi-bin/man/man2html?2+clone">clone</A></B>(2)
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for an explanation of thread groups.
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<P>
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Glibc does not provide a wrapper for
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<B>tkill</B>();
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call it using
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<B><A HREF="/cgi-bin/man/man2html?2+syscall">syscall</A></B>(2).
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Before glibc 2.30, there was also no wrapper function for
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<B>tgkill</B>().
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+clone">clone</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+gettid">gettid</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+kill">kill</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+rt_sigqueueinfo">rt_sigqueueinfo</A></B>(2)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="6"><A HREF="#lbAB">NAME</A><DD>
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<DT id="7"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="8"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="9"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="10"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="11"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="12"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="13"><A HREF="#lbAI">NOTES</A><DD>
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<DT id="14"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="15"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:35 GMT, March 31, 2021
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