Differential D6335 Diff 16255 lib/libc/sys/thr_kill.2

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				.Dd May 5, 2016
				.Dt THR_kill 2
				.Os
				.Sh NAME
				.Nm thr_kill
				.Nd send signal to the thread
				.Sh LIBRARY
				.Lb libc
				.Sh 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"
				.Sh DESCRIPTION
				The
				.Fn thr_kill
				and
				.Fn thr_kill2
				system calls allow sending a signal, specified by the
				.Fa sig
				emasteUnsubmitted Done Inline Actions allow sending a signal, emaste: allow sending a signal,
				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
				emasteUnsubmitted Done Inline Actions function, the pid argument specifies the process with threads to be signalled. emaste: function, the pid argument specifies the process with threads to be signalled.
				argument specifies the process with threads to be signalled.
				.Pp
				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.
				.Pp
				emasteUnsubmitted Done Inline Actions only the thread with the thread identifier equal to the arguemnt is signalled emaste: only the thread with the thread identifier equal to the arguemnt is signalled
				The
				.Fa sig
				argument defines the delivered signal.
				It must be a valid signal number or zero.
				In the later case no signal is actually send, and the call is used to
				verify the liveness of the thread.
				.Pp
				emasteUnsubmitted Done Inline Actions In the latter case no signal is actually send, and the call is used to emaste: In the latter case no signal is actually send, and the call is used to
				The signal is delivered with
				.Dv siginfo
				.Dv si_code
				set to
				.Dv SI_LWP .
				.Sh RETURN VALUES
				If successful,
				.Fn thr_kill
				and
				.Fn thr_kill2
				will return zero, otherwise \-1 is returned, and
				.Va errno
				emasteUnsubmitted Done Inline Actions and emaste: and
				is set to indicate the error.
				.Sh ERRORS
				The
				.Fn thr_kill
				and
				.Fn thr_kill2
				operations return the following errors:
				.Bl -tag -width Er
				.It Bq Er EINVAL
				emasteUnsubmitted Done Inline Actions may return / can return / or just "operations return" ? emaste: may return / can return / or just "operations return" ?
				The
				.Fa sig
				argument is not zero and does not specify valid signal.
				.It Bq Er ESRCH
				The specified process or thread was not found.
				.El
				.Pp
				emasteUnsubmitted Done Inline Actions Maybe "The specified process or thread was not found." emaste: Maybe "The specified process or thread was not found."
				Additionally, the
				.Fn thr_kill2
				may return the following errors:
				.Bl -tag -width Er
				.It Bq Er EPERM
				The current process does not have sufficient privilege to check existence or
				send a signal to the specified process.
				.El
				emasteUnsubmitted Done Inline Actions The current process does not have sufficient privilege to check ? emaste: The current process does not have sufficient privilege to check ?
				.Sh SEE ALSO
				.Xr thr_exit 2 ,
				.Xr thr_new 2 ,
				.Xr thr_self 2 ,
				.Xr thr_set_name 2 ,
				.Xr _umtx_op 2 ,
				.Xr signal 3
				.Sh 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
				.Xr pthread(3)
				functionality.