Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
79 lines
1.2 KiB
C
79 lines
1.2 KiB
C
/*
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* $Id: lock.c,v 1.4 2007/07/11 16:37:35 cparker Exp $
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*
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* Copyright (C) 1997 Lars Fenneberg
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*
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* See the file COPYRIGHT for the respective terms and conditions.
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* If the file is missing contact me at lf@elemental.net
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* and I'll send you a copy.
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*
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*/
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#include "config.h"
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#include "includes.h"
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#if defined(HAVE_FLOCK)
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int do_lock_exclusive(FILE * fd)
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{
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return flock(fileno(fd), LOCK_EX|LOCK_NB);
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}
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int do_unlock(FILE * fd)
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{
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return flock(fileno(fd), LOCK_UN);
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}
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#elif defined(WIN32)
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int do_lock_exclusive(FILE * fd)
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{
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_lock_file(fd);
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return 1;
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}
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int do_unlock(FILE * fd)
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{
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_unlock_file(fd);
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return 1;
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}
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#elif defined(HAVE_FCNTL)
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int do_lock_exclusive(FILE * fd)
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{
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flock_t fl;
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int res;
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memset((void *)&fl, 0, sizeof(fl));
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fl.l_type = F_WRLCK;
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fl.l_whence = fl.l_start = 0;
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fl.l_len = 0; /* 0 means "to end of file" */
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res = fcntl(fileno(fd), F_SETLK, &fl);
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if ((res == -1) && (errno == EAGAIN))
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errno = EWOULDBLOCK;
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return res;
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}
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int do_unlock(FILE * fd)
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{
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flock_t fl;
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memset((void *)&fl, 0, sizeof(fl));
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fl.l_type = F_UNLCK;
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fl.l_whence = fl.l_start = 0;
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fl.l_len = 0; /* 0 means "to end of file" */
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return fcntl(fileno(fd), F_SETLK, &fl);
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}
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#else
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#error YOU_LOSE "need either flock(2) or fcntl(2)"
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#endif
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