NAME
thrkill —
send signal to a thread in the same
process
SYNOPSIS
#include
<signal.h>
int
thrkill(pid_t
tid, int sig,
void *tcb);
DESCRIPTION
The
thrkill()
function sends the signal given by sig to
tid, a thread in the same process as the caller.
thrkill() will only succeed if
tcb is either NULL or the
address of the thread control block (TCB) of the target thread.
sig may be one of the signals specified in
sigaction(2) or it may be 0, in which case error checking is
performed but no signal is actually sent.
If tid is zero then the current thread is targeted.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
ERRORS
thrkill() will fail and no signal will be
sent if:
- [
EINVAL] - sig is not a valid signal number.
- [
ESRCH] - The process doesn't have a thread with thread ID tid.
- [
ESRCH] - tcb is not
NULLand not the TCB address of the thread with thread ID tid.
SEE ALSO
__get_tcb(2), kill(2), sigaction(2), pthread_kill(3), raise(3)
STANDARDS
The thrkill() function is specific to
OpenBSD and should not be used in portable
applications. Use
pthread_kill(3) instead.
HISTORY
The thrkill() system call appeared in
OpenBSD 5.9.