Mercurial > hg > mlmmj
view src/mylocking.c @ 887:3032cb926799 BRANCH_1_2_18
Added tag RELEASE_1_2_18_1 for changeset c1b22b049682
author | Ben Schmidt |
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date | Wed, 05 Feb 2014 17:14:22 +1100 |
parents | 1705c8e709b4 |
children |
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/* Copyright (C) 2002, 2003, 2005 Mads Martin Joergensen <mmj at mmj.dk> * * $Id$ * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include <unistd.h> #include <fcntl.h> #include <errno.h> #include "mylocking.h" int myexcllock(int fd) { int excllock; struct flock locktype; locktype.l_type = F_WRLCK; locktype.l_whence = SEEK_SET; locktype.l_start = 0; locktype.l_len = 0; do { excllock = fcntl(fd, F_SETLKW, &locktype); } while(excllock < 0 && errno == EINTR); return excllock; } int myunlock(int fd) { int unlock; struct flock locktype; locktype.l_type = F_UNLCK; locktype.l_whence = SEEK_SET; locktype.l_start = 0; locktype.l_len = 0; do { unlock = fcntl(fd, F_SETLKW, &locktype); } while(unlock < 0 && errno == EINTR); return unlock; }