1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "../common/compat.h"
30 #include <stdio.h>
31 #include <errno.h>
32 #include <sys/types.h>
33 #include <unistd.h>
34 #include <sys/syscall.h>
35 #include <sys/uio.h>
36
37 /*
38 * If reading from the utmp file, map the data to the SunOS 4.1
39 * format on the fly.
40 */
41 extern void to_utmp(char *, char *, int);
42
43 int
readv(int fd,struct iovec * iov,int iovcnt)44 readv(int fd, struct iovec *iov, int iovcnt)
45 {
46 return (bc_readv(fd, iov, iovcnt));
47 }
48
49 int
bc_readv(int fd,struct iovec * iov,int iovcnt)50 bc_readv(int fd, struct iovec *iov, int iovcnt)
51 {
52 int fds, ret, off;
53 int i, size, total = 0;
54 char *nbuf;
55
56 if (fd_get(fd) != -1) { /* we're reading utmp (utmpx really) */
57 for (i = 0; i < iovcnt; i++) {
58 size = getmodsize(iov[i].iov_len,
59 sizeof (struct compat_utmp),
60 sizeof (struct utmpx));
61
62 if ((nbuf = (void *)malloc(size)) == NULL) {
63 fprintf(stderr, "readv: malloc failed\n");
64 exit(-1);
65 }
66
67 if ((ret = _read(fd, nbuf, size)) == -1) {
68 if (errno == EAGAIN)
69 errno = EWOULDBLOCK;
70 free(nbuf);
71 return (-1);
72 }
73
74 to_utmp(iov[i].iov_base, nbuf, ret);
75
76 ret = getmodsize(ret, sizeof (struct utmpx),
77 sizeof (struct compat_utmp));
78 total += ret;
79
80 free(nbuf);
81 }
82
83 return (total);
84 }
85
86 if ((ret = _readv(fd, iov, iovcnt)) == -1) {
87 if (errno == EAGAIN)
88 errno = EWOULDBLOCK;
89 }
90 return (ret);
91 }
92