69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*-
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* Copyright (c) 2007 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <link.h>
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#include "libc_private.h"
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/*
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* This is private to libc. It is intended for wrapping syscall stubs in order
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* to avoid having to put SIGSYS signal handlers in place to test for presence
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* of new syscalls. This caches the result in order to be as quick as possible.
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*
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* Use getosreldate(3) for public use as it respects the $OSVERSION environment
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* variable.
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*/
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int
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__getosreldate(void)
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{
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static int osreldate;
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size_t len;
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int oid[2];
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int error, osrel;
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if (osreldate != 0)
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return (osreldate);
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error = _elf_aux_info(AT_OSRELDATE, &osreldate, sizeof(osreldate));
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if (error == 0 && osreldate != 0)
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return (osreldate);
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oid[0] = CTL_KERN;
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oid[1] = KERN_OSRELDATE;
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osrel = 0;
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len = sizeof(osrel);
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error = sysctl(oid, 2, &osrel, &len, NULL, 0);
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if (error == 0 && osrel > 0 && len == sizeof(osrel))
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osreldate = osrel;
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return (osreldate);
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}
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