65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/*
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* $QNXLicenseC:
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* Copyright 2007, QNX Software Systems. All Rights Reserved.
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*
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* You must obtain a written license from and pay applicable license fees to QNX
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* Software Systems before you may reproduce, modify or distribute this software,
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* or any work that includes all or part of this software. Free development
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* licenses are available for evaluation and non-commercial purposes. For more
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* information visit http://licensing.qnx.com or email licensing@qnx.com.
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*
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* This file may contain contributions from others. Please review this entire
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* file for other proprietary rights or license notices, as well as the QNX
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* Development Suite License Guide at http://licensing.qnx.com/license-guide/
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* for other information.
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* $
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/iofunc.h>
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#include "iofunc.h"
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int iofunc_sync(resmgr_context_t *ctp, iofunc_ocb_t *ocb, int ioflag) {
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iofunc_attr_t *attr;
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iofunc_mount_t *mountp;
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// Not on a readonly filesystem
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if((mountp = (attr = ocb->attr)->mount) && (mountp->flags & _MOUNT_READONLY)) {
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return 0;
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}
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// If called from read, only do a sync if O_RSYNC is set...
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if((ioflag & _IO_FLAG_MASK) != _IO_FLAG_RD || (ocb->ioflag & O_RSYNC)) {
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// if called from read or write, use the OCB flags as well
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if(ioflag & _IO_FLAG_MASK) {
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ioflag |= ocb->ioflag;
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}
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// O_SYNC is a superset of O_DSYNC, check it first
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if(ioflag & O_SYNC) {
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// Even if _MOUNT_NOATIME is set, set DIRTY_TIME flag when O_SYNC is requested
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if(attr->flags & (IOFUNC_ATTR_ATIME | IOFUNC_ATTR_MTIME | IOFUNC_ATTR_CTIME)) {
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attr->flags |= IOFUNC_ATTR_DIRTY_TIME;
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}
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// Return non-zero if anything is dirty
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if(attr->flags & IOFUNC_ATTR_DIRTY_MASK) {
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return O_SYNC;
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}
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} else if(ioflag & O_DSYNC) {
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// Posix seems to imply that only time can be ignored....
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if(attr->flags & (IOFUNC_ATTR_DIRTY_MASK & ~IOFUNC_ATTR_DIRTY_TIME)) {
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return O_DSYNC;
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}
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}
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}
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return 0;
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}
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__SRCVERSION("iofunc_sync.c $Rev: 153052 $");
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