proc_signal(9F)

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);

void proc_unref(void ∗pref);

int proc_signal(void ∗pref, int sig);

INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).

ARGUMENTS

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(5) 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

proc_ref()

pref An opaque handle used to refer to the current process.

proc_signal()

0 The process existed before the signal was sent.

−1 The process no longer exists; no signal was sent.

CONTEXT

proc_unref() and proc_signal() can be called from user or interrupt context. proc_ref() should only be called from user context.

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