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[/] [or1k_old/] [trunk/] [linux/] [uClibc/] [libc/] [misc/] [file/] [lockf64.c] - Blame information for rev 1782

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1 1325 phoenix
/* Copyright (C) 1994, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Library General Public License as
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   published by the Free Software Foundation; either version 2 of the
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   License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Library General Public License for more details.
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   You should have received a copy of the GNU Library General Public
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   License along with the GNU C Library; see the file COPYING.LIB.  If not,
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   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include <features.h>
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#ifdef __UCLIBC_HAS_LFS__
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#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS != 64 
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#undef _FILE_OFFSET_BITS
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#define _FILE_OFFSET_BITS   64
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#endif
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#ifndef __USE_FILE_OFFSET64
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# define __USE_FILE_OFFSET64    1
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#endif
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#ifndef __USE_LARGEFILE64
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# define __USE_LARGEFILE64      1
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#endif
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#endif
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#define __USE_GNU
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#ifdef __NR_fcntl64
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#define flock flock64
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#define fcntl fcntl64
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#define F_GETLK F_GETLK64
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#define F_SETLK F_SETLK64
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#endif
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/* lockf is a simplified interface to fcntl's locking facilities.  */
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int lockf64 (int fd, int cmd, off64_t len64)
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{
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    struct flock fl;
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    off_t len = (off_t) len64;
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    if (len64 != (off64_t) len)
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    {
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        /* We can't represent the length.  */
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        __set_errno(EOVERFLOW);
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        return -1;
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    }
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    memset((char *) &fl, '\0', sizeof (fl));
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    /* lockf is always relative to the current file position.  */
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    fl.l_whence = SEEK_CUR;
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    fl.l_start = 0;
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    fl.l_len = len;
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    switch (cmd)
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    {
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        case F_TEST:
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            /* Test the lock: return 0 if FD is unlocked or locked by this process;
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               return -1, set errno to EACCES, if another process holds the lock.  */
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            fl.l_type = F_RDLCK;
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            if (fcntl (fd, F_GETLK, &fl) < 0)
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                return -1;
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            if (fl.l_type == F_UNLCK || fl.l_pid == getpid ())
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                return 0;
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            __set_errno(EACCES);
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            return -1;
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        case F_ULOCK:
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            fl.l_type = F_UNLCK;
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            cmd = F_SETLK;
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            break;
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        case F_LOCK:
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            fl.l_type = F_WRLCK;
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            cmd = F_SETLKW;
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            break;
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        case F_TLOCK:
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            fl.l_type = F_WRLCK;
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            cmd = F_SETLK;
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            break;
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        default:
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            __set_errno(EINVAL);
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            return -1;
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    }
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    return fcntl(fd, cmd, &fl);
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}
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