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freebsd-dev/lib/libc/gen/uname.c

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BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
/*-
* Copyright (c) 1994
* The Regents of the University of California. 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.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
Fix SCM ID's.
2002-02-01 00:57:29 +00:00
static char sccsid[] = "From: @(#)uname.c 8.1 (Berkeley) 1/4/94";
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#endif /* LIBC_SCCS and not lint */
Fix SCM ID's.
2002-02-01 00:57:29 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Revert r202447 by re-exposing the old uname(3) function. It makes hardly any sense to expose a symbol which should only be provided for binary compatibility, but it seems we don't have a lot of choice here. There are many autoconf scripts out there that try to create a binary that links against the old symbol to see whether uname(3) is present. These scripts fail to detect uname(3) now. It should be noted that the behaviour we implement is not against the standards: | The following shall be declared as a function and may also be defined | as a macro: | | int uname(struct utsname *);
2010-01-19 23:07:12 +00:00
#define uname wrapped_uname
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/utsname.h>
sysctl(3) can return an error (setting errno to ENOMEM) when the fields in the utsname structure are too small to hold their corresponding MIB variables. Don't return an error in this case.
1994-10-13 20:31:19 +00:00
#include <errno.h>
Revert r202447 by re-exposing the old uname(3) function. It makes hardly any sense to expose a symbol which should only be provided for binary compatibility, but it seems we don't have a lot of choice here. There are many autoconf scripts out there that try to create a binary that links against the old symbol to see whether uname(3) is present. These scripts fail to detect uname(3) now. It should be noted that the behaviour we implement is not against the standards: | The following shall be declared as a function and may also be defined | as a macro: | | int uname(struct utsname *);
2010-01-19 23:07:12 +00:00
#undef uname
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
int
Revert r202447 by re-exposing the old uname(3) function. It makes hardly any sense to expose a symbol which should only be provided for binary compatibility, but it seems we don't have a lot of choice here. There are many autoconf scripts out there that try to create a binary that links against the old symbol to see whether uname(3) is present. These scripts fail to detect uname(3) now. It should be noted that the behaviour we implement is not against the standards: | The following shall be declared as a function and may also be defined | as a macro: | | int uname(struct utsname *);
2010-01-19 23:07:12 +00:00
uname(struct utsname *name)
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
{
This is kind of a hack, but it should work. Currently, world is broken because libc/rpc/key_call.c references uname(), and ps/print.c also defines uname(), and ps is linked statically. This leads to a symbol clash. The userland uname(3) kinda sucked anyway as the hostname etc was too short. And since the libc rpc interface now uses the utsname.nodename which gets truncated, I was tempted into doing something about it. Create a new userland uname function, called __xuname() which takes an extra argument that allows you to change the size of the fields. uname() becomes a static inline function in sys/utsname.h that passes the extra argument in. struct utsname has its field members expanded by default now in userland. We still provide a 'uname' externally linkable function for things that either think that they ``know'' the utsname format and assume 32 character strings and bypass the include file, or objects that are linked against old libcs. ie: just about every plausible case that I can think of is covered. Should we ever change the default lengths again, a libc major bump should not be required as the size is now passed to the function. XXX the uname(2) in the kernel is for FreeBSD 1.1 binary compatability! All the uname(3) functions that are exported to userland are actually implemented in libc with sysctl. uname(1) uses sysctl directly and does not call uname(3). PR: bin/4688
2001-03-24 04:40:49 +00:00
return __xuname(32, name);
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
}
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