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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1999 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "../common/compat.h" 30 #include <errno.h> 31 #include <stdio.h> 32 #include <sys/types.h> 33 #include <unistd.h> 34 #include <syscall.h> 35 36 /* 37 * If reading from the utmp file, map the data to the SunOS 4.1 38 * format on the fly. 39 */ 40 extern int errno; 41 42 extern void to_utmp(char *, char *, int); 43 44 int 45 read(int fd, char *buf, int size) 46 { 47 return (bc_read(fd, buf, size)); 48 } 49 50 int 51 bc_read(int fd, char *buf, int size) 52 { 53 int fds, ret, off; 54 char *nbuf; 55 56 if (fd_get(fd) != -1) { /* we're reading utmp (utmpx, really) */ 57 size = getmodsize(size, sizeof (struct compat_utmp), 58 sizeof (struct utmpx)); 59 60 if ((nbuf = (void *)malloc(size)) == NULL) { 61 (void) fprintf(stderr, "read: malloc failed\n"); 62 exit(-1); 63 } 64 65 if ((ret = _read(fd, nbuf, size)) == -1) { 66 if (errno == EAGAIN) 67 errno = EWOULDBLOCK; 68 free(nbuf); 69 return (-1); 70 } 71 to_utmp(buf, nbuf, ret); 72 73 ret = getmodsize(ret, sizeof (struct utmpx), 74 sizeof (struct compat_utmp)); 75 free(nbuf); 76 return (ret); 77 } 78 79 if ((ret = _read(fd, buf, size)) == -1) { 80 if (errno == EAGAIN) 81 errno = EWOULDBLOCK; 82 } 83 return (ret); 84 } 85 86 void 87 to_utmp(char *buf, char *nbuf, int len) 88 { 89 struct compat_utmp *ut; 90 struct utmpx *utx; 91 92 utx = (struct utmpx *) nbuf; 93 ut = (struct compat_utmp *) buf; 94 95 while ((char *)utx < (nbuf + len)) { 96 (void) strncpy(ut->ut_line, utx->ut_line, sizeof (ut->ut_line)); 97 (void) strncpy(ut->ut_name, utx->ut_user, sizeof (ut->ut_name)); 98 (void) strncpy(ut->ut_host, utx->ut_host, sizeof (ut->ut_host)); 99 ut->ut_time = utx->ut_tv.tv_sec; 100 utx++; 101 ut++; 102 } 103 } 104