proc_signal(9F) Kernel Functions for Drivers 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);
voidproc_unref(void *pref);
int proc_signal(void *pref, int sig);
INTERFACE LEVEL
Solaris DDI specific (Solaris 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_sig‐
nal() 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:
0 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.
SEE ALSOsignal.h(3HEAD), putnextctl1(9F)
Writing Device Drivers
SunOS 5.10 16 Jan 2006 proc_signal(9F)
