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
|
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
/*
* ap_slack.c: File descriptor preallocation
*
* 3/21/93 Rob McCool
* 1995-96 Many changes by the Apache Software Foundation
*
*/
#ifndef WIN32
#include "apr_config.h"
#else
#include "apr_winconfig.h"
#endif
#ifdef APACHE
#include "http_log.h"
#endif
#include "apr_lib.h"
#ifndef NO_SLACK
int ap_slack(int fd, int line)
{
#if !defined(F_DUPFD)
return fd;
#else
static int low_warned;
int new_fd;
#ifdef HIGH_SLACK_LINE
if (line == APR_SLACK_HIGH && fd < HIGH_SLACK_LINE) {
new_fd = fcntl(fd, F_DUPFD, HIGH_SLACK_LINE);
if (new_fd != -1) {
close(fd);
return new_fd;
}
}
#endif
/* otherwise just assume line == APR_SLACK_LOW */
if (fd >= LOW_SLACK_LINE) {
return fd;
}
new_fd = fcntl(fd, F_DUPFD, LOW_SLACK_LINE);
if (new_fd == -1) {
if (!low_warned) {
#ifdef APACHE
/* Give them a warning here, because we really can't predict
* how libraries and such are going to fail. If we can't
* do this F_DUPFD there's a good chance that apache has too
* few descriptors available to it. Note we don't warn on
* the high line, because if it fails we'll eventually try
* the low line...
*/
ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
"unable to open a file descriptor above %u, "
"you may need to increase the number of descriptors",
LOW_SLACK_LINE);
#endif /* APACHE */
low_warned = 1;
}
return fd;
}
close(fd);
return new_fd;
#endif
}
#else
/* need at least one function in the file for some linkers */
void ap_slack_is_not_here(void) {}
#endif /* NO_SLACK */
|
