malloc function Post: 29093

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1 . Thanks everyone who read the post. 2 . the programe is that : #include <stdio.h> #include <string.h> void do_it(char *p) { p = (char *) malloc(100); (void )strcpy(p,"1234"); } int main(void) { char *p; do_it(p); (void )printf("p = %s \n",p);

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io::poll

IO::Poll(3pm)						 Perl Programmers Reference Guide					     IO::Poll(3pm)

NAME

       IO::Poll - Object interface to system poll call

SYNOPSIS

	   use IO::Poll qw(POLLRDNORM POLLWRNORM POLLIN POLLHUP);

	   $poll = new IO::Poll;

	   $poll->mask($input_handle => POLLIN);
	   $poll->mask($output_handle => POLLOUT);

	   $poll->poll($timeout);

	   $ev = $poll->events($input);

DESCRIPTION

       "IO::Poll" is a simple interface to the system level poll routine.

METHODS

       mask ( IO [, EVENT_MASK ] )
	   If EVENT_MASK is given, then, if EVENT_MASK is non-zero, IO is added to the list of file descriptors and the next call to poll will
	   check for any event specified in EVENT_MASK. If EVENT_MASK is zero then IO will be removed from the list of file descriptors.

	   If EVENT_MASK is not given then the return value will be the current event mask value for IO.

       poll ( [ TIMEOUT ] )
	   Call the system level poll routine. If TIMEOUT is not specified then the call will block. Returns the number of handles which had
	   events happen, or -1 on error.

       events ( IO )
	   Returns the event mask which represents the events that happend on IO during the last call to "poll".

       remove ( IO )
	   Remove IO from the list of file descriptors for the next poll.

       handles( [ EVENT_MASK ] )
	   Returns a list of handles. If EVENT_MASK is not given then a list of all handles known will be returned. If EVENT_MASK is given then a
	   list of handles will be returned which had one of the events specified by EVENT_MASK happen during the last call ti "poll"

SEE ALSO

       poll(2), IO::Handle, IO::Select

AUTHOR

       Graham Barr. Currently maintained by the Perl Porters.  Please report all bugs to <perl5-porters@perl.org>.

COPYRIGHT

       Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved.  This program is free software; you can redistribute it and/or
       modify it under the same terms as Perl itself.

perl v5.8.0							    2002-06-01							     IO::Poll(3pm)

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