fdsetsize.h
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1 /*
2  * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
3  *
4  * Squid software is distributed under GPLv2+ license and includes
5  * contributions from numerous individuals and organizations.
6  * Please see the COPYING and CONTRIBUTORS files for details.
7  */
8 
9 #ifndef SQUID_FDSETSIZE_H
10 #define SQUID_FDSETSIZE_H
11 
12 /****************************************************************************
13  *--------------------------------------------------------------------------*
14  * DO *NOT* MAKE ANY CHANGES below here unless you know what you're doing...*
15  *--------------------------------------------------------------------------*
16  ****************************************************************************/
17 
18 /*
19  * On some systems, FD_SETSIZE is set to something lower than the
20  * actual number of files which can be opened. IRIX is one case,
21  * NetBSD is another. So here we increase FD_SETSIZE to our
22  * configure-discovered maximum *before* any system includes.
23  */
24 #define CHANGE_FD_SETSIZE 1
25 
26 /*
27  * Cannot increase FD_SETSIZE on Linux, but we can increase __FD_SETSIZE
28  * with glibc 2.2 (or later? remains to be seen). We do this by including
29  * bits/types.h which defines __FD_SETSIZE first, then we redefine
30  * __FD_SETSIZE. Ofcourse a user program may NEVER include bits/whatever.h
31  * directly, so this is a dirty hack!
32  */
33 #if _SQUID_LINUX_ || _SQUID_KFREEBSD_
34 #undef CHANGE_FD_SETSIZE
35 #define CHANGE_FD_SETSIZE 0
36 #include <features.h>
37 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)
38 #if SQUID_MAXFD > DEFAULT_FD_SETSIZE
39 #include <bits/types.h>
40 #if HAVE_LINUX_POSIX_TYPES_H
41 #include <linux/posix_types.h>
42 #endif
43 #undef __FD_SETSIZE
44 #define __FD_SETSIZE SQUID_MAXFD
45 #endif
46 #endif
47 #endif
48 
49 /*
50  * Cannot increase FD_SETSIZE on FreeBSD before 2.2.0, causes select(2)
51  * to return EINVAL.
52  * --Marian Durkovic <marian@svf.stuba.sk>
53  * --Peter Wemm <peter@spinner.DIALix.COM>
54  */
55 #if _SQUID_FREEBSD_
56 #include <osreldate.h>
57 #if __FreeBSD_version < 220000
58 #undef CHANGE_FD_SETSIZE
59 #define CHANGE_FD_SETSIZE 0
60 #endif
61 #endif
62 
63 /*
64  * Trying to redefine CHANGE_FD_SETSIZE causes a slew of warnings
65  * on Mac OS X Server.
66  */
67 #if _SQUID_APPLE_
68 #undef CHANGE_FD_SETSIZE
69 #define CHANGE_FD_SETSIZE 0
70 #endif
71 
72 /* Increase FD_SETSIZE if SQUID_MAXFD is bigger */
73 #if CHANGE_FD_SETSIZE && SQUID_MAXFD > DEFAULT_FD_SETSIZE
74 #define FD_SETSIZE SQUID_MAXFD
75 #endif
76 
77 /*
78  * Trap unintentional use of fd_set. Must not be used outside the
79  * select code as it only supports FD_SETSIZE number of filedescriptors
80  * and Squid may be running with a lot more..
81  * But only for code linked into Squid, not the helpers.. (unlinkd, pinger)
82  */
83 #ifdef SQUID_FDSET_NOUSE
84 # ifndef SQUID_HELPER
85 # define fd_set ERROR_FD_SET_USED
86 # endif
87 #endif
88 
89 #endif /* SQUID_FDSETSIZE_H */
90 

 

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