proc_ref(9f)

1proc_signal(9F)          Kernel Functions for Drivers          proc_signal(9F)
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NAME

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

9       #include <sys/ddi.h>
10       #include <sys/sunddi.h>
11       #include <sys/signal.h>
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15       void *proc_ref(void)
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18       voidproc_unref(void *pref);
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21       int proc_signal(void *pref, int sig);
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INTERFACE LEVEL

25       Solaris DDI specific (Solaris DDI).
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PARAMETERS

28       pref    A handle for the process to be signalled.
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31       sig     Signal number to be sent to the process.
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DESCRIPTION

35       This set of routines allows a driver to send a signal to a process. The
36       routine proc_ref() is used to retrieve an unambiguous reference to  the
37       process  for  signalling  purposes.  The  return value can be used as a
38       unique handle on the process, even if the process dies. Because  system
39       resources  are committed to a process reference, proc_unref() should be
40       used to remove it as soon as it is no  longer  needed.proc_signal()  is
41       used to send signal sig to the referenced process. The following set of
42       signals may be sent to a process from a driver:
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44       SIGHUP      The device has been disconnected.
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47       SIGINT      The interrupt character has been received.
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50       SIGQUIT     The quit character has been received.
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53       SIGPOLL     A pollable event has occurred.
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56       SIGKILL     Kill the process (cannot be caught or ignored).
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59       SIGWINCH    Window size change.
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62       SIGURG      Urgent data are available.
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66       See signal.h(3HEAD) for more details on the meaning of these signals.
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69       If the process has exited at the time the signal  was  sent,  proc_sig‐
70       nal()  returns an error code; the caller should remove the reference on
71       the process by calling proc_unref().
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74       The driver writer must ensure that for each call  made  to  proc_ref(),
75       there is exactly one corresponding call to proc_unref().
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RETURN VALUES

78       The proc_ref() returns the following:
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80       pref    An opaque handle used to refer to the current process.
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84       The proc_signal() returns the following:
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86       0     The process existed before the signal was sent.
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89       -1    The process no longer exists; no signal was sent.
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CONTEXT

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