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LEARN ABOUT SUNOS

svc_add_input

rpc_svc_input(3NSL)				       Networking Services Library Functions				       rpc_svc_input(3NSL)

NAME

       rpc_svc_input, svc_add_input, svc_remove_input - declare or remove a callback on a file descriptor

SYNOPSIS

       #include <rpc/rpc.h>

       typedef void (*svc_callback_t)(svc_input_id_t id, int fd, unsigned int events,  void *cookie);

       svc_input_id_t svc_add_input(int fd, unsigned int revents, svc_callback_t callback, void *cookie);

       int svc_remove_input(svc_input_t id);

DESCRIPTION

       The following RPC routines are used to declare or remove a callback on a file descriptor.

   Routines
       See rpc(3NSL) for the definition of the SVCXPRT data structure.

       svc_add_input()

	   This  function  is used to register a callback function on a file descriptor, fd. The file descriptor, fd, is the first parameter to be
	   passed to svc_add_input(). This callback function will be automatically called if any of the events specified in the  events  parameter
	   occur on this descriptor. The events parameter is used to specify when the callback is invoked. This parameter is a mask of poll events
	   to which the user wants to listen. See poll(2) for further details of the events that can be specified.

	   The callback to be invoked is specified using the callback parameter. The cookie parameter can be used to pass any data to the callback
	   function. This parameter is a user-defined value which is passed as an argument to the callback function, and it is not used by the Sun
	   RPC library itself.

	   Several callbacks can be registered on the same file descriptor as long as each callback registration specifies a separate set of event
	   flags.

	   The	callback  function  is called with the registration id, the fd file descriptor, an revents value, which is a bitmask of all events
	   concerning the file descriptor, and the cookie user-defined value.

	   Upon successful completion, the function returns a unique identifier for this registration, that can be used later to remove this call-
	   back. Upon failure, -1 is returned and errno is set to indicate the error.

	   The svc_add_input() function will fail if:

	   EINVAL	   The fd or events parameters are invalid.

	   EEXIST	   A callback is already registered to the file descriptor with one of the specified events.

	   ENOMEM	   Memory is exhausted.

       svc_remove_input()

	   This  function  is  used  to unregister a callback function on a file descriptor, fd. The id parameter specifies the registration to be
	   removed.

	   Upon successful completion, the function returns zero. Upon failure, -1 is returned and errno is set to indicate the error.

	   The svc_remove_input() function will fail if:

	   EINVAL	   The id parameter is invalid.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |All			   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsl (32-bit)		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWcslx (64-bit) 	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       poll(2), rpc(3NSL), attributes(5)

SunOS 5.10							    6 Jan 2003						       rpc_svc_input(3NSL)

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