POLL function fails under AIX v5.3

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Operating Systems AIX POLL function fails under AIX v5.3
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Old 02-14-2008
POLL function fails under AIX v5.3

I am having a strange problem with the poll() routine. I compiled a module under AIX 5.2 using the poll routine, it worked fine. When the OS was upgraded to AIX 5.3 the poll routine return an error code.

Here is a summary of the code:

#define MAX_EVENTS 300
long eventCount;
POLLIST(MAX_EVENTS,MAX_EVENTS) pList; /* defined in the the /usr/include/sys/poll.h file */
eventCount = poll( &pList, (long)((MAX_EVENTS<<16)|(MAX_EVENTS)),
(long) 0 );

The above call returns -1 and the global variable errno is set to 22 (EINVAL) under AIX 5.3, BUT works fine under AIX 5.2.

I have not changed the code. Can you anyone explain why this is no longer working?

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poll.h(3HEAD)							      Headers							     poll.h(3HEAD)

poll.h, poll - definitions for the poll() function SYNOPSIS
#include <poll.h> DESCRIPTION
The <poll.h> header defines the pollfd structure, which includes the following members: int fd the following descriptor being polled short events the input event flags (see below) short revents the output event flags (see below) The <poll.h> header defines the following type through typedef: nfds_t an unsigned integer type used for the number of file descriptors The implementation supports one or more programming environments in which the width of nfds_t is no greater than the width of type long. The names of these programming environments can be obtained using the confstr() function or the getconf utility. See confstr(3C) and get- conf(1). The following symbolic constants are defined, zero or more of which can be OR'ed together to form the events or revents members in the pollfd structure: POLLIN Data other than high-priority data can be read without blocking. POLLRDNORM Normal data can be read without blocking. POLLRDBAND Priority data can be read without blocking. POLLPRI High priority data can be read without blocking. POLLOUT Normal data can be written without blocking. POLLWRNORM Equivalent to POLLOUT. POLLWRBAND Priority data can be written. POLLERR An error has occurred (revents only). POLLHUP Device has been disconnected (revents only). POLLNVAL Invalid fd member (revents only). The significance and semantics of normal, priority, and high-priority data are file and device-specific. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
getconf(1), poll(2), confstr(3C), attributes(5), standards(5) SunOS 5.10 9 Sep 2004 poll.h(3HEAD)