mirror of https://github.com/mkerrisk/man-pages
125 lines
3.4 KiB
Groff
125 lines
3.4 KiB
Groff
.\" Copyright (c) 2009 Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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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.\" manual page may be incorrect or out-of-date.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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.\" %%%LICENSE_END
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.\"
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.TH PTHREAD_KILL 3 2015-08-08 "Linux" "Linux Programmer's Manual"
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.SH NAME
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pthread_kill \- send a signal to a thread
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.SH SYNOPSIS
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.nf
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.B #include <signal.h>
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.BI "int pthread_kill(pthread_t " thread ", int " sig );
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.fi
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.sp
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Compile and link with \fI\-pthread\fP.
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.ad l
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.BR pthread_kill ():
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.RS 4
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_POSIX_C_SOURCE\ >=\ 199506L || _XOPEN_SOURCE\ >=\ 500
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.RE
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.ad b
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.SH DESCRIPTION
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The
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.BR pthread_kill ()
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function sends the signal
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.I sig
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to
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.IR thread ,
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a thread in the same process as the caller.
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The signal is asynchronously directed to
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.IR thread .
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If
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.I sig
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is 0, then no signal is sent, but error checking is still performed.
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.SH RETURN VALUE
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On success,
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.BR pthread_kill ()
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returns 0;
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on error, it returns an error number, and no signal is sent.
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.SH ERRORS
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.TP
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.B EINVAL
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An invalid signal was specified.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lb lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR pthread_kill ()
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T} Thread safety MT-Safe
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.TE
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.SH CONFORMING TO
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POSIX.1-2001, POSIX.1-2008.
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.SH NOTES
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Signal dispositions are process-wide:
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if a signal handler is installed,
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the handler will be invoked in the thread
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.IR thread ,
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but if the disposition of the signal is "stop", "continue", or "terminate",
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this action will affect the whole process.
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The glibc implementation of
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.BR pthread_kill ()
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gives an error
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.RB ( EINVAL )
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on attempts to send either of the real-time signals
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used internally by the NPTL threading implementation.
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See
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.BR nptl (7)
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for details.
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POSIX.1-2008 recommends that if an implementation detects the use
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of a thread ID after the end of its lifetime,
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.BR pthread_kill ()
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should return the error
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.BR ESRCH .
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The glibc implementation returns this error in the cases where
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an invalid thread ID can be detected.
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But note also that POSIX says that an attempt to use a thread ID whose
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lifetime has ended produces undefined behavior,
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and an attempt to use an invalid thread ID in a call to
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.BR pthread_kill ()
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can, for example, cause a segmentation fault.
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.SH SEE ALSO
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.BR kill (2),
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.BR sigaction (2),
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.BR sigpending (2),
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.BR pthread_self (3),
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.BR pthread_sigmask (3),
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.BR raise (3),
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.BR pthreads (7),
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.BR signal (7)
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