rsm_memseg_get_pollfRemote)Shared Memory Library Fursm_memseg_get_pollfd(3RSM)NAME
rsm_memseg_get_pollfd, rsm_memseg_release_pollfd - get or release a
poll descriptor
SYNOPSIS
cc [ flag... ] file... -lrsm [ library... ]
#include <rsmapi.h>
int rsm_memseg_get_pollfd(void *memseg, struct pollfd *fd);
int rsm_memseg_release_pollfd(void *memseg);
DESCRIPTION
The rsm_memseg_get_pollfd() and rsm_memseg_release_pollfd() functions
provide an alternative to rsm_intr_signal_wait(3RSM). The waiting
process can multiplex event waiting using the poll(2) function after
first obtaining a poll descriptor using rsm_memseg_get_pollfd(). The
descriptor can subsequently be released using rsm_mem‐
seg_release_pollfd().
As a result of a call rsm_memseg_get_pollfd(), the specified pollfd
structure is initialized with a descriptor for the specified segment
(memseg) and the event generated by rsm_intr_signal_post(3RSM). Either
an export segment handle or an import segment handle can be type cast
to a void pointer. The pollfd argument can subsequently be used with
the rsm_intr_signal_wait_pollfd(3RSM) function to wait for the event;
it cannot be used with poll(). If memseg references an export segment,
the segment must be currently published. If memseg references an
import segment, the segment must be connected.
The rsm_memseg_reslease_pollfd() function decrements the reference
count of the pollfd structure associated with the specified segment. A
segment unpublish, destroy or unmap operation will fail if the refer‐
ence count is non-zero.
RETURN VALUES
Upon successful completion, these functions return 0. Otherwise, an
error value is returned to indicate the error.
ERRORS
The rsm_memseg_get_pollfd() and rsm_memseg_release_pollfd() function
can return the following error:
RSMERR_BAD_SEG_HNDL Invalid segment handle.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Evolving │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOpoll(2), rsm_intr_signal_post(3RSM), rsm_intr_signal_wait_pollfd(3RSM),
attributes(5)SunOS 5.10 1 Dec 2002 rsm_memseg_get_pollfd(3RSM)
