rsm_intr_signal_wait_pollfd

- wait for events on a list of file descriptors

Synopsis

cc [ flag... ] file… -lrsm [ library … ] 
#include <rsmapi.h>

int rsm_intr_signal_wait_pollfd(struct pollfd fds[],
     nfds_t nfds, int timeout, int *numfdsp);

Description

The rsm_intr_signal_wait_pollfd() function is similar to rsm_intr_signal_wait(3RSM), except that it allows an application to multiplex I/O over various types of file descriptors. Applications can use this function to wait for interrupt signals on RSMAPI segments as well as poll for I/O events on other non-RSMAPI file descriptors.

The fds argument is an array of pollfd structures that correspond to both RSMAPI segments and other file descriptors. The rsm_memseg_get_pollfd(3RSM) is used to obtain a pollfd structure corresponding to an RSMAPI segment.

The number of file descriptors that have events is returned in numfdsp. This parameter can be set to NULL if the application is not interested in the number of file descriptors that have events. See poll(2) for descriptions of the pollfd structure as well as the nfds and timeout parameters.

It is the application's responsibility to establish the validity of a pollfd structure corresponding to an RSMAPI segment by ensuring that rsm_memseg_release_pollfd(3RSM) has not been called on the segment or that the segment has not been destroyed.

For file descriptors other than RSMAPI segments, the behavior of rsm_intr_signal_wait_pollfd() is similar to poll().

Return Values

Upon successful completion, rsm_intr_signal_wait_pollfd() returns 0 and the revents member of the pollfd struct corresponding to an RSMAPI segment is set to POLLRDNORM, indicating that an interrupt signal for that segment was received. Otherwise, an error value is returned.

For file descriptors other than RSMAPI segments, the revents member of the pollfd struct is identical to that returned by poll(2).

Errors

The rsm_intr_signal_wait_pollfd() function can return the following errors:

RSMERR_TIMEOUT

Timeout has occured.

RSMERR_BAD_ARGS_ERRORS

Invalid arguments passed.

RSMERR_BAD_ADDR

An argument points to an illegal address.

RSMERR_INTERRUPTED

The call was interrupted.

RSMERR_INSUFFICIENT_MEM

Insufficient memory.

RSMERR_INSUFFICIENT_RESOURCES

Insufficient resources.

Attributes

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

See Also

poll(2), rsm_intr_signal_wait(3RSM), rsm_memseg_get_pollfd(3RSM), rsm_memseg_release_pollfd(3RSM), attributes(5)