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git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15306 87f5fb63-7c3d-0410-a384-fd976d0f7a62
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
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* $Id:
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
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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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*
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* - 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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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _UNISTD_HEADERS_H
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#include "unistd_headers.h"
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#endif /* _UNISTD_HEADERS_H */
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/****************************************************************************/
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/* The following is not part of the ISO 'C' (1994) standard. */
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/****************************************************************************/
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int
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lockf(int file_descriptor,int function,off_t size)
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{
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struct flock l;
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int result = -1;
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int cmd;
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l.l_whence = SEEK_CUR;
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l.l_start = 0;
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l.l_len = size;
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switch(function)
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{
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case F_ULOCK:
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cmd = F_SETLK;
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l.l_type = F_UNLCK;
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break;
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case F_LOCK:
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cmd = F_SETLKW;
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l.l_type = F_WRLCK;
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break;
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case F_TLOCK:
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cmd = F_SETLK;
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l.l_type = F_WRLCK;
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break;
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case F_TEST:
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l.l_type = F_WRLCK;
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if(fcntl(file_descriptor,F_GETLK,&l) == -1)
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goto out;
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if(l.l_pid == getpid() || l.l_type == F_UNLCK)
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{
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result = 0;
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goto out;
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}
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__set_errno(EAGAIN);
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goto out;
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default:
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__set_errno(EINVAL);
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goto out;
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}
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result = fcntl(file_descriptor,cmd,&l);
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out:
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return(result);
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}
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