/usr/lib/dcmtk/cgi-bin/lock.ph is in dcmtk-www 3.6.0-15.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | #!/usr/bin/perl
#
# Copyright (C) 1996-2010, OFFIS e.V.
# All rights reserved. See COPYRIGHT file for details.
#
# This software and supporting documentation were developed by
#
# OFFIS e.V.
# R&D Division Health
# Escherweg 2
# D-26121 Oldenburg, Germany
#
# for CEN/TC251/WG4 as a contribution to the Computer Assisted Radiology
# (CAR) 1996 DICOM Demonstration.
#
#
# Module: dcmwlm (WWW Component)
#
# Author: Marco Eichelberg
#
# Purpose:
# This module contains perl procedures which allow to set/unset
# read and write locks on one certain file (which is stored in a
# global variable).
# The procedures use the perl fcntl() call instead of flock() in order
# to be "compatible" with the dcmtk Basic Worklist Management components
# written in C++, on both BSD and System V platforms.
# Since the "struct flock" required for fcntl() is defined differently
# on every system, this perl script relies on a C program "preplock" which
# initialises the flock structure from <fcntl.h> and passes the result
# to perl.
#
# Last Update: $Author: joergr $
# Update Date: $Date: 2010-10-14 13:02:01 $
# CVS/RCS Revision: $Revision: 1.2 $
# Status: $State: Exp $
#
# CVS/RCS Log
# $Log: lock.ph,v $
# Revision 1.2 2010-10-14 13:02:01 joergr
# Updated copyright header. Added reference to COPYRIGHT file.
#
# Revision 1.1 2002/12/03 12:16:06 wilkens
# Added files und functionality from the dcmtk/wlisctn folder to dcmtk/dcmwlm
# so that dcmwlm can now completely replace wlistctn in the public domain part
# of dcmtk. Pertaining to this replacement requirement, another optional return
# key attribute was integrated into the wlm utilities.
#
#
#
require 'prefs.ph';
$fcntldata=`$prefs{'preplock'}`;
eval $fcntldata;
$fd_inuse=0; # 0=no_lock, 1=read_lock, 2=write_lock
#
# usage: &set_readlock('pathname');
# returns 1 if successful, 0 upon failure.
# modifies the global variable $fd_inuse and the file descriptor fd.
#
sub set_readlock
{
local($lockname, $last, $fcntldata);
if ((@_ != 1)||($_[0] eq ''))
{
printf(stderr "error: NULL path not allowed\n");
return 0;
}
$lockname = $_[0];
if ($fd_inuse ne 0)
{
printf(stderr "error: nested read locks not allowed!\n");
return 0;
}
$last = chop($lockname);
if ($last eq '/')
{
$lockname = join('','+<',$lockname,$last,$prefs{'lockfile'});
} else {
$lockname = join('','+<',$lockname,$last,'/',$prefs{'lockfile'});
}
if (!open(fd, $lockname))
{
$fd_inuse = 0;
printf(stderr "error: cannot open file %s\n",$lockname);
return 0;
} else {
$fd_inuse=1;
}
$fcntldata = $const_RDLCK_STRUCT;
if (-1 eq fcntl(fd,$const_F_SETLKW, $fcntldata))
{
printf(stderr "error: cannot set read lock on file %s\n",$lockname);
close(fd);
$fd_inuse = 0;
return 0;
}
return 1;
}
#
# usage: &set_writelock('pathname');
# returns 1 if successful, 0 upon failure.
# modifies the global variable $fd_inuse and the file descriptor fd.
#
sub set_writelock
{
local($lockname, $last, $fcntldata);
if ((@_ != 1)||($_[0] eq ''))
{
printf(stderr "error: NULL path not allowed\n");
return 0;
}
$lockname = $_[0];
if ($fd_inuse eq 2)
{
printf(stderr "error: nested write locks not allowed!\n");
return 0;
}
$last = chop($lockname);
if ($last eq '/')
{
$lockname = join('','+<',$lockname,$last,$prefs{'lockfile'});
} else {
$lockname = join('','+<',$lockname,$last,'/',$prefs{'lockfile'});
}
if ($fd_inuse eq 0)
{
if (!open(fd, $lockname))
{
$fd_inuse = 0;
printf(stderr "error: cannot open file %s\n",$lockname);
return 0;
}
}
$fcntldata = $const_WRLCK_STRUCT;
if (-1 eq fcntl(fd,$const_F_SETLKW, $fcntldata))
{
printf(stderr "error: cannot set write lock on file %s\n",$lockname);
close(fd);
$fd_inuse = 0;
return 0;
}
$fd_inuse=2;
return 1;
}
#
# usage: &release_lock;
# returns 1 if successful, 0 upon failure.
# modifies the global variable $fd_inuse and the file descriptor fd.
#
sub release_lock
{
local($lockname, $last, $fcntldata);
if ($fd_inuse eq 0)
{
printf(stderr "error: no lock to release!\n");
return 0;
}
$fcntldata = $const_UNLCK_STRUCT;
if (-1 eq fcntl(fd,$const_F_SETLKW, $fcntldata))
{
printf(stderr "error: cannot release lock.\n");
close(fd);
$fd_inuse = 0;
return 0;
}
$fd_inuse = 0;
return 1;
}
1;
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