freebsd-skq/usr.sbin/lpr/common_source/lp.cdefs.h
gad 92ccb9a78d Change the closeallfds() routine to use closefrom() when it is
available (closefrom() was added to FreeBSD in 8.0-release).
The selection is made at compile-time, as I still compile a
FreeBSD-based version of lpr&friends on other platforms.

While testing I out that (at least on my system) lpd has been
closing 11095 fd's, when there are only 6 fd's open.  The old
code took 120 times more clocktime than calling closefrom().
(although that was still less than 2/1000-ths of a second!)

Reviewed by:	jilles
MFC after:	2 weeks
2013-05-27 22:19:01 +00:00

123 lines
4.3 KiB
C

/*-
* ------+---------+---------+---------+---------+---------+---------+---------*
* Copyright (c) 2003,2013 - Garance Alistair Drosehn <gad@FreeBSD.org>.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of the FreeBSD Project.
*
* ------+---------+---------+---------+---------+---------+---------+---------*
* $FreeBSD$
* ------+---------+---------+---------+---------+---------+---------+---------*
*/
/*
* The main goal of this include file is to provide a platform-neutral way
* to define some macros that lpr wants from FreeBSD's <sys/cdefs.h>. This
* will simply use the standard <sys/cdefs.h> when compiled in FreeBSD, but
* other OS's may not have /usr/include/sys/cdefs.h (or even if that file
* exists, it may not define all the macros that lpr will use).
*/
#if !defined(_LP_CDEFS_H_)
#define _LP_CDEFS_H_
/*
* For non-BSD platforms, you can compile lpr with -DHAVE_SYS_CDEFS_H
* if <sys/cdefs.h> should be included.
*/
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
# define HAVE_SYS_CDEFS_H
#endif
#if defined(HAVE_SYS_CDEFS_H)
# include <sys/cdefs.h>
#endif
/*
* FreeBSD added a closefrom() routine in release 8.0. When compiling
* `lpr' on other platforms you might want to include bsd-closefrom.c
* from the portable-openssh project.
*/
#ifndef USE_CLOSEFROM
# if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
# define USE_CLOSEFROM 1
# endif
#endif
/* The macro USE_CLOSEFROM must be defined with a value of 0 or 1. */
#ifndef USE_CLOSEFROM
# define USE_CLOSEFROM 0
#endif
/*
* __unused is a compiler-specific trick which can be used to avoid
* warnings about a variable which is defined but never referenced.
* Some lpr files use this, so define a null version if it was not
* defined by <sys/cdefs.h>.
*/
#if !defined(__unused)
# define __unused
#endif
/*
* All the lpr source files will want to reference __FBSDID() to
* handle rcs id's.
*/
#if !defined(__FBSDID)
# if defined(lint) || defined(STRIP_FBSDID)
# define __FBSDID(s) struct skip_rcsid_struct
# elif defined(__IDSTRING) /* NetBSD */
# define __FBSDID(s) __IDSTRING(rcsid,s)
# else
# define __FBSDID(s) static const char rcsid[] __unused = s
# endif
#endif /* __FBSDID */
/*
* Some lpr include files use __BEGIN_DECLS and __END_DECLS.
*/
#if !defined(__BEGIN_DECLS)
# if defined(__cplusplus)
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
# else
# define __BEGIN_DECLS
# define __END_DECLS
# endif
#endif
/*
* __printflike and __printf0like are a compiler-specific tricks to
* tell the compiler to check the format-codes in printf-like
* routines wrt the args that will be formatted.
*/
#if !defined(__printflike)
# define __printflike(fmtarg, firstvararg)
#endif
#if !defined(__printf0like)
# define __printf0like(fmtarg, firstvararg)
#endif
#endif /* !_LP_CDEFS_H_ */