95 lines
2.5 KiB
C
95 lines
2.5 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 <errno.h>
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#include <fcntl.h>
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#include <share.h>
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#include <sys/iofunc.h>
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#include "iofunc.h"
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int iofunc_link(resmgr_context_t *ctp, io_link_t *msg, iofunc_attr_t *attr, iofunc_attr_t *dattr, struct _client_info *info) {
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struct _client_info buff;
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int status;
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iofunc_mount_t *mountp;
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mode_t old_mode;
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// If no attr or no dattr, there is a problem.
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if(!attr || !dattr) {
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return EBADFSYS;
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}
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mountp = attr->mount ? attr->mount : dattr->mount;
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if(msg) {
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// Get client info if no info passed in
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if(!info && (status = iofunc_client_info(ctp, msg->connect.ioflag, info = &buff)) != EOK) {
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return status;
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}
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if(S_ISDIR(attr->mode)) {
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// Does file system allow link on directories?
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if(!mountp || (mountp->conf & IOFUNC_PC_LINK_DIR) == 0) {
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return EPERM;
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}
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// Only root can unlink a directory
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if((status = iofunc_check_access(ctp, attr, 0, info)) != EOK) {
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return status;
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}
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}
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}
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// save old mode
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old_mode = attr->mode;
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if((status = _iofunc_create(ctp, dattr, &attr->mode, mountp, info)) != EOK) {
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return status;
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}
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// If mode is changed, flag it.
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if(old_mode != attr->mode) {
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attr->flags |= IOFUNC_ATTR_DIRTY_MODE;
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}
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// If linking a directory increment parent link count (for "..")
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if(S_ISDIR(attr->mode)) {
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dattr->nlink++;
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dattr->flags |= IOFUNC_ATTR_DIRTY_NLINK;
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}
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// mark parent time flags
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dattr->flags |= IOFUNC_ATTR_DIRTY_TIME | IOFUNC_ATTR_MTIME | IOFUNC_ATTR_CTIME;
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// increment the link count
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attr->nlink++;
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if(S_ISDIR(attr->mode)) {
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// linking a directory imlies linking "." so increment again
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attr->nlink++;
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}
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// mark file time flags and link dirty
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attr->flags |= IOFUNC_ATTR_DIRTY_NLINK | IOFUNC_ATTR_DIRTY_TIME | IOFUNC_ATTR_CTIME;
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return EOK;
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}
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__SRCVERSION("iofunc_link.c $Rev: 153052 $");
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