96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
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/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H<EFBFBD>gskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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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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* 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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*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* H<EFBFBD>gskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 "krb_locl.h"
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RCSID("$Id: k_flock.c,v 1.8 1997/04/01 08:18:30 joda Exp $");
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#define K_OP_MASK (K_LOCK_SH | K_LOCK_EX | K_LOCK_UN)
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int
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k_flock(int fd, int operation)
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{
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#ifdef HAVE_FLOCK
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int op = 0;
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if (operation & K_LOCK_SH)
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op |= LOCK_SH;
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if (operation & K_LOCK_EX)
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op |= LOCK_EX;
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if (operation & K_LOCK_UN)
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op |= LOCK_UN;
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if (operation & K_LOCK_NB)
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op |= LOCK_NB;
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return flock(fd, op);
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#elif defined(HAVE_FCNTL) && defined(F_SETLK)
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struct flock arg;
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int code, cmd;
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arg.l_whence = SEEK_SET;
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arg.l_start = 0;
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arg.l_len = 0; /* means to EOF */
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if (operation & K_LOCK_NB)
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cmd = F_SETLK;
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else
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cmd = F_SETLKW; /* Blocking */
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switch (operation & K_OP_MASK) {
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case K_LOCK_UN:
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arg.l_type = F_UNLCK;
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code = fcntl(fd, F_SETLK, &arg);
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break;
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case K_LOCK_SH:
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arg.l_type = F_RDLCK;
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code = fcntl(fd, cmd, &arg);
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break;
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case K_LOCK_EX:
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arg.l_type = F_WRLCK;
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code = fcntl(fd, cmd, &arg);
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break;
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default:
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errno = EINVAL;
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code = -1;
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break;
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}
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return code;
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#else
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return -1;
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#endif /* !HAVE_FLOCK */
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}
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