73 lines
2.2 KiB
C
73 lines
2.2 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 <sys/iofunc.h>
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int iofunc_chmod(resmgr_context_t *ctp, io_chmod_t *msg, iofunc_ocb_t *ocb, iofunc_attr_t *attr) {
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int status;
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mode_t mode;
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struct _client_info info;
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// Get the client credentials
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if((status = iofunc_client_info(ctp, ocb->ioflag, &info)) != EOK) {
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return status;
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}
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// Check for owner or appropriate privileges
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if((status = iofunc_check_access(ctp, attr, S_ISUID, &info)) != EOK) {
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return status;
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}
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// Is it a read only filesystem?
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if(attr->mount && (attr->mount->flags & _MOUNT_READONLY)) {
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if (!(attr->flags & IOFUNC_ATTR_SYNTHETIC))
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return EROFS;
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}
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// Update the mode
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mode = (attr->mode & ~(S_IPERMS | S_ISUID | S_ISGID | S_ISVTX)) |
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(msg->i.mode & (S_IPERMS | S_ISUID | S_ISGID | S_ISVTX));
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// Knock down the sticky bit if not a directory and not enough perms
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if((mode & S_ISVTX) && !S_ISDIR(mode) && iofunc_check_access(ctp, attr, 0, &info) != EOK) {
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mode &= ~S_ISVTX;
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}
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// Knock down set-group-id bit as per POSIX 1003.1 section 5.6.4.2
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if((mode & S_ISGID) && !S_ISDIR(mode) && (mode & (S_IXUSR | S_IXGRP | S_IXOTH)) &&
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iofunc_check_access(ctp, attr, S_ISGID, &info) != EOK) {
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mode &= ~S_ISGID;
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}
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// If mode is changed, mark it dirty
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if(mode != attr->mode) {
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attr->flags |= IOFUNC_ATTR_DIRTY_MODE;
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attr->mode = mode;
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}
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// Mark ctime for update
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attr->flags |= (IOFUNC_ATTR_CTIME | IOFUNC_ATTR_DIRTY_TIME);
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return EOK;
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}
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__SRCVERSION("iofunc_chmod.c $Rev: 153052 $");
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