79 lines
1.9 KiB
C
Executable File
79 lines
1.9 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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */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* This source code is unpublished proprietary information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 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 "@(#)readlink.c 1.2 94/09/13 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/file.h>
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#include <sys/uio.h>
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#include <sys/ioreq.h>
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#include <sys/debug.h>
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/*
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* Read the contents of a symbolic link.
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*/
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int
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readlink(char *name, char *buf, int count)
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{
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vnode_t *vp;
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struct iovec aiov;
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struct uio auio;
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int error;
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if (error = lookupname(name, UIO_USERSPACE, NO_FOLLOW, NULLVPP, &vp))
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return (set_errno(error));
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if (vp->v_type != VLNK) {
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VN_RELE(vp);
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return (set_errno(EINVAL));
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}
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aiov.iov_base = buf;
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aiov.iov_len = count;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_loffset = 0;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_resid = count;
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if (error = VOP_READLINK(vp, &auio, CRED())) {
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VN_RELE(vp);
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return (set_errno(error));
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}
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VN_RELE(vp);
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return (count - auio.uio_resid);
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}
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