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POLL function fails under AIX v5.3

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Operating Systems AIX POLL function fails under AIX v5.3
# 1  
Old 02-13-2008
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?

Thanks,
Tahir
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LEARN ABOUT DEBIAN

explain_poll_or_die

explain_poll_or_die(3)					     Library Functions Manual					    explain_poll_or_die(3)

NAME

       explain_poll_or_die - wait for some event on file descriptor and report errors

SYNOPSIS

       #include <libexplain/poll.h>
       int explain_poll_or_die(struct pollfd *fds, int nfds, int timeout);
       int explain_poll_on_error(struct pollfd *fds, int nfds, int timeout);

DESCRIPTION

       The  explain_poll_or_die  function  is  used to call the poll(2) system call. On failure an explanation will be printed to stderr, obtained
       from the explain_poll(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

       The explain_poll_on_error function is used to call the poll(2) system call. On failure an explanation will be printed to  stderr,  obtained
       from the explain_poll(3) function, but still returns to the caller.

       fds     The fds, exactly as to be passed to the poll(2) system call.

       nfds    The nfds, exactly as to be passed to the poll(2) system call.

       timeout The timeout, exactly as to be passed to the poll(2) system call.

RETURN VALUE

       The explain_poll_or_die function only returns on success, see poll(2) for more information. On failure, prints an explanation and exits, it
       does not return.

       The explain_poll_on_error function always returns the value return by the wrapped poll(2) system call.

EXAMPLE

       The explain_poll_or_die function is intended to be used in a fashion similar to the following example:
	      int result = explain_poll_or_die(fds, nfds, timeout);

SEE ALSO

       poll(2) wait for some event on a file descriptor

       explain_poll(3)
	       explain poll(2) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2010 Peter Miller

															    explain_poll_or_die(3)