NAME

       thr_kill — send signal to thread

LIBRARY

       Standard C Library (libc, -lc)

SYNOPSIS

       #include <sys/thr.h>

       int
       thr_kill(long id, int sig);

       int
       thr_kill2(pid_t pid, long id, int sig);

DESCRIPTION

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

       The  id  argument  specifies  which  threads  get  the  signal.  If 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  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, thr_kill() and thr_kill2() will return zero, otherwise -1 is returned, and errno is set to
       indicate the error.

ERRORS

       The thr_kill() and thr_kill2() operations return the following errors:

       [EINVAL]           The sig argument is not zero and does not specify valid signal.

       [ESRCH]            The specified process or thread was not found.

       Additionally, the thr_kill2() may return the following errors:

       [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_exit(2), thr_new(2), thr_self(2), thr_set_name(2), _umtx_op(2), pthread_kill(3), signal(3)

STANDARDS

       The  thr_kill()  and  thr_kill2() system calls are non-standard and are used by the 1:1 Threading Library
       (libthr, -lthr) to implement IEEE Std 1003.1-2001 (“POSIX.1”) pthread(3) functionality.

Debian                                            June 1, 2016                                       THR_kill(2)