January 20, 2007 _LWP_KILL 2

### NAME

_lwp_kill - send a signal to a light-weight process

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```int` _lwp_kill(```lwpid_t lwp``, int sig`)

### DESCRIPTION

_lwp_kill(``) sends the signal specified by ```sig` to the light-weight process specified by ```lwp`. If the ```sig` argument is given as 0 (zero), _lwp_kill will test for the existance of the target LWP, but will take no further action.

Job control signals and uncatchable signals can not be directed to a specific LWP: if posted with , they will affect all LWPs in the process.

Signals will be posted successfully to suspended LWPs, but will not be handled further until the LWP has been continued.

### RETURN VALUES

A 0 value indicates that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicate the reason.

### ERRORS

[```EINVAL`]
  ```sig` is not a valid signal number.

[```ESRCH`]
  No LWP can be found in the current process corresponding to that specified by ```lwp`.

### SEE ALSO

_lwp_continue(2), _lwp_suspend(2), kill(2), sigaction(2), signal(7)

### HISTORY

The _lwp_kill(``) system call first appeared in NetBSD5.0.