thr_kill (2)

Leading comments

Copyright (c) 2016 The FreeBSD Foundation, Inc.
All rights reserved.

This documentation was written by
Konstantin Belousov <kib@FreeBSD.org> under sponsorship
from the FreeBSD Foundation.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form...

(The comments found at the beginning of the groff file "man2/thr_kill.2freebsd".)

NAME

thr_kill - send signal to thread

LIBRARY

Lb libc

SYNOPSIS

In sys/thr.h Ft int Fn thr_kill long id int sig Ft int Fn thr_kill2 pid_t pid long id int sig

DESCRIPTION

The Fn thr_kill and Fn thr_kill2 system calls allow sending a signal, specified by the Fa sig argument, to some threads in a process. For the Fn thr_kill function, signalled threads are always limited to the current process. For the Fn thr_kill2 function, the Fa pid argument specifies the process with threads to be signalled.

The Fa id argument specifies which threads get the signal. If Fa id is equal to -1, all threads in the specified process are signalled. Otherwise, only the thread with the thread identifier equal to the argument is signalled.

The Fa sig argument defines the delivered signal. It must be a valid signal number or zero. In the latter case no signal is actually sent, and the call is used to verify the liveness of the thread.

The signal is delivered with siginfo si_code set to SI_LWP

RETURN VALUES

If successful, Fn thr_kill and Fn thr_kill2 will return zero, otherwise -1 is returned, and errno is set to indicate the error.

ERRORS

The Fn thr_kill and Fn thr_kill2 operations return the following errors:

Bq Er EINVAL

The Fa sig argument is not zero and does not specify valid signal.

Bq Er ESRCH

The specified process or thread was not found.

Additionally, the Fn thr_kill2 may return the following errors:

Bq Er EPERM

The current process does not have sufficient privilege to check existence or send a signal to the specified process.

SEE ALSO

kill(2), thr_exit2, thr_new2, thr_self2, thr_set_name2, _umtx_op2, pthread_kill3, signal(3)

STANDARDS

The Fn thr_kill and Fn thr_kill2 system calls are non-standard and are used by the Lb libthr to implement St -p1003.1-2001 pthread(3) functionality.