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_sig-
       nal() 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

       proc_ref() returns the following:

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

       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

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

SEE ALSO

       signal.h(3HEAD), putnextctl1(9F)

       Writing Device Drivers

SunOS 5.10							    7 Feb 1994							   proc_signal(9F)