svc_remove_input(3RPC)

NAME | SYNOPSIS | Routines | ATTRIBUTES | SEE ALSO

NAME

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

SYNOPSIS

#include <rpc/rpc.h>

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


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

void svc_remove_input(svc_input_t id);

Routines

See rpc(3RPC) 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 the user wants to listen to. See poll(2POSIX) 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 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 different 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 callback. 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 fails if:

EINVAL

The id parameter is invalid.

ATTRIBUTES

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
MT-Level	MT-Safe

SEE ALSO

rpc(3RPC) , poll(2POSIX)

ChorusOS 5.0  Last Revised December 2001

NAME | SYNOPSIS | Routines | ATTRIBUTES | SEE ALSO