NAME

proc_signal, proc_ref, proc_unref - send a signal to a process

SYNOPSIS

#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/signal.h>
void *proc_ref(void)

voidproc_unref(void *pref);

int proc_signal(void *pref, int sig);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

pref

A handle for the process to be signalled.

sig

Signal number to be sent to the process.

DESCRIPTION

This set of routines allows a driver to send a signal to a process. The routine proc_ref() is used to retrieve an unambiguous reference to the process for signalling purposes. The return value can be used as a unique handle on the process, even if the process dies. Because system resources are committed to a process reference, proc_unref() should be used to remove it as soon as it is no longer needed.proc_signal() is used to send signal sig to the referenced process. The following set of signals may be sent to a process from a driver:

SIGHUP

The device has been disconnected.

SIGINT

The interrupt character has been received.

SIGQUIT

The quit character has been received.

SIGPOLL

A pollable event has occurred.

SIGKILL

Kill the process (cannot be caught or ignored).

SIGWINCH

Window size change.

SIGURG

Urgent data are available.

See signal.h(3HEAD) for more details on the meaning of these signals.

If the process has exited at the time the signal was sent, proc_signal() returns an error code; the caller should remove the reference on the process by calling proc_unref().

The driver writer must ensure that for each call made to proc_ref(), there is exactly one corresponding call to proc_unref().

RETURN VALUES

The proc_ref() returns the following:

pref

An opaque handle used to refer to the current process.

The proc_signal() returns the following:

The process existed before the signal was sent.

-1

The process no longer exists; no signal was sent.

CONTEXT

The proc_unref() and proc_signal() functions can be called from user, interrupt, or kernel context. The proc_ref() function should be called only from user context.