open.al

platform file from motorola kernel code

# The source files are wholly original Motorola proprietary work now being 
# licensed as BSD, the following Copyright Notice will be added to each source 
# code file, documentation and other materials with the distribution:
# 
#       Copyright  2006, Motorola, All Rights Reserved.
# 
# This program is licensed under a BSD license with the following terms:
# 
# Redistribution and use in source and binary forms, with or without 
# modification, are permitted provided that the following conditions are met:
#
# - Redistributions of source code must retain the above copyright notice, 
#   this list of conditions and the following disclaimer. 
#
# - Redistributions in binary form must reproduce the above copyright notice, 
#   this list of conditions and the following disclaimer in the documentation 
#   and/or other materials provided with the distribution. 
#
# - Neither the name of the MOTOROLA nor the names of its contributors may be 
#   used to endorse or promote products derived from this software without 
#   specific prior written permission.
#
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
# POSSIBILITY OF SUCH DAMAGE.
#


my $wr_mode = O_WRONLY | O_RDWR;

sub {
	my $this = shift;
	my $fh = UNIVERSAL::isa($this,__PACKAGE__)
		? $this
		: __PACKAGE__->new($this);

	my ($file,$mode,$perms) = ($$fh->{SCALAR},@_);
	$mode = O_RDONLY unless defined($mode);
	$perms = 0666 unless defined($perms);

        #locking doesn't quite work... at least in il93h 
	#my $lock = ($mode & $wr_mode) ? LOCK_EX : LOCK_SH;
	#unless (sysopen($fh,$file,$mode,$perms) && flock($fh,$lock)) {
	unless (sysopen($fh,$file,$mode,$perms)) {
		die("open: $file: $!\n");
	}

	$fh;
}