98 lines
2.1 KiB
C
Executable File
98 lines
2.1 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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/*
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* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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* PROPRIETARY NOTICE (Combined)
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*
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* This source code is unpublished proprietary information
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* constituting, or derived under license from AT&T's UNIX(r) System V.
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* In addition, portions of such source code were derived from Berkeley
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* 4.3 BSD under license from the Regents of the University of
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* California.
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*
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*
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*
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* Copyright Notice
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*
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* Notice of copyright on this source code product does not indicate
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* publication.
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*
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* (c) 1986, 1987, 1988, 1989, 1994 Sun Microsystems, Inc
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* (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T.
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* All rights reserved.
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*
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*/
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#ident "@(#)access.c 1.3 94/10/13 SMI" /* SVr4 1.103 */
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#include <sys/param.h>
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#include <sys/isa_defs.h>
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <sys/cred.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/pathname.h>
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#include <sys/vnode.h>
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#include <sys/uio.h>
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#include <sys/cmn_err.h>
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#include <sys/debug.h>
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/*
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* Determine accessibility of file.
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*/
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#define E_OK 010 /* use effective ids */
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#define R_OK 004
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#define W_OK 002
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#define X_OK 001
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int
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access(char *fname, int fmode)
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{
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vnode_t *vp;
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register cred_t *tmpcr;
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register int error;
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register int mode;
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register int eok;
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register cred_t *cr;
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if (fmode & ~(E_OK|R_OK|W_OK|X_OK))
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return (set_errno(EINVAL));
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mode = ((fmode & (R_OK|W_OK|X_OK)) << 6);
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eok = (fmode & E_OK);
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if (eok)
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tmpcr = CRED();
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else {
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cr = CRED();
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tmpcr = crdup(cr);
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tmpcr->cr_uid = cr->cr_ruid;
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tmpcr->cr_gid = cr->cr_rgid;
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tmpcr->cr_ruid = cr->cr_uid;
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tmpcr->cr_rgid = cr->cr_gid;
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}
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if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
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if (!eok)
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crfree(tmpcr);
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return (set_errno(error));
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}
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if (mode) {
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if (error = VOP_ACCESS(vp, mode, 0, tmpcr))
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(void) set_errno(error);
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}
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if (!eok)
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crfree(tmpcr);
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VN_RELE(vp);
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return (error);
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}
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