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) 2000 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #ifndef _DHCPTAB_H 28 #define _DHCPTAB_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Implementation-specific data structures and constants for the binary 34 * dhcptab container. These structures are subject to change at any time. 35 */ 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 #include <sys/types.h> 42 #include <dhcp_svc_public.h> 43 44 #define DT_NOREC 0 /* "no record" id value */ 45 #define DT_MAGIC 0x0d6c94ab /* "dhcptab" in a hexadecimal world */ 46 47 /* 48 * Constants for use with find_dt 49 */ 50 #define FIND_PARTIAL 0x0001 /* allow partial success */ 51 #define FIND_POSITION 0x0002 /* return dt_recpos_t's */ 52 53 /* 54 * Header atop the dhcptab container -- contains some basic information 55 * about the container for sanity-checking purposes. 56 */ 57 typedef struct dt_header { 58 unsigned char dth_version; /* container version */ 59 unsigned char dth_align[3]; /* ensure binary compatibility */ 60 uint32_t dth_magic; /* magic for sanity check */ 61 uint32_t dth_pad[4]; /* for future use */ 62 } dt_header_t; 63 64 /* 65 * What each dt_rec_t looks like on-disk -- note that we cannot just write 66 * dt_rec_t's because the `dt_value' field can be arbitrarily large. 67 * Instead, write out the dt_rec_t structure followed by the variable-size 68 * `rec_dtval' array which will contain the current value of `dt_value'. 69 * Since `rec_dtval' is of variable size, we must explicitly keep track of 70 * its length via `rec_dtvalsize'. 71 */ 72 typedef struct dt_filerec { 73 dt_rec_t rec_dt; /* actual dt_rec_t */ 74 uint32_t rec_dtvalsize; /* total size of rec_dtval */ 75 char rec_dtval[1]; /* dt_value field from dt_rec_t */ 76 } dt_filerec_t; 77 78 /* 79 * Per-record state describing the underlying record, including its 80 * position on-disk; these are returned instead of dt_rec_t's when find_dt 81 * is called with FIND_POSITION set. Note that for this to work, the 82 * dt_rec_t must be the first member. 83 */ 84 typedef struct dt_recpos { 85 dt_rec_t dtp_rec; /* traditional dt_rec_t */ 86 size_t dtp_size; /* its size in the file */ 87 off_t dtp_off; /* its starting offset in the file */ 88 } dt_recpos_t; 89 90 /* 91 * Per-instance state for each handle returned from open_dt 92 */ 93 typedef struct dt_handle { 94 unsigned int dh_oflags; /* flags passed into open_dt */ 95 char dh_location[MAXPATHLEN]; /* location of container */ 96 } dt_handle_t; 97 98 #ifdef __cplusplus 99 } 100 #endif 101 102 #endif /* _DHCPTAB_H */ 103