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 /* 24 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 29 /* All Rights Reserved */ 30 31 /* 32 * Streams Command strconf: display the configuration of the 33 * stream associated with stdin. 34 * 35 * USAGE: strconf 36 * or: strconf -m module 37 * or: strconf -t 38 * 39 * strconf with no options lists the modules on the stream. 40 * -m module echos "yes" and returns 0 if the module is on the stream. 41 * echos "no" and returns 2 if not. 42 * -t lists only the topmost module. returns 0 if there is a 43 * module, 2 if not. 44 * 45 * RETURNS: 46 * 0 SUCCESS it works 47 * 1 ERR_USAGE bad invocation 48 * 2 ERR_MODULE module not there 49 * 3 ERR_STDIN an ioctl on the stdin stream failed 50 * 4 ERR_MEM couldn't allocate memory 51 */ 52 53 #include <stdio.h> 54 #include <sys/stropts.h> 55 #include <string.h> 56 #include <stdlib.h> 57 #include <unistd.h> 58 59 #define OPTLIST "m:t" 60 #define USAGE "USAGE: %s [ -m module | -t ]\n" 61 62 #define SUCCESS 0 63 #define FAILURE 1 64 65 #define ERR_USAGE 1 /* bad invocation */ 66 #define ERR_MODULE 2 /* module not there */ 67 #define ERR_STDIN 3 /* an ioctl on the stdin stream failed */ 68 #define ERR_MEM 4 /* couldn't allocate memory */ 69 70 #define NMODULES 16 /* "reasonable" # of modules on a stream */ 71 /* (there can be more) */ 72 #define MAXMODULES 2048 /* max # of modules */ 73 74 static char *Cmd_namep; /* how was it invoked? */ 75 static int more_modules(struct str_list *, int); 76 77 int 78 main(int argc, char **argv) 79 { 80 char *modp; /* ptr to module name */ 81 int i; /* loop var & junk (what else?) */ 82 boolean_t mod_present; /* B_TRUE if -m module */ 83 boolean_t topmost; /* B_TRUE if -t */ 84 struct str_mlist mlist[NMODULES]; /* modlist for strlist */ 85 struct str_list strlist; /* mods on stream */ 86 87 /* 88 * init 89 */ 90 Cmd_namep = argv[0]; 91 mod_present = topmost = B_FALSE; 92 strlist.sl_nmods = NMODULES; 93 strlist.sl_modlist = mlist; 94 95 /* 96 * parse args 97 */ 98 if (argc > 1) { 99 while ((i = getopt(argc, argv, OPTLIST)) != -1) { 100 switch (i) { 101 case 'm': /* module present ? */ 102 modp = optarg; 103 mod_present = B_TRUE; 104 break; 105 106 case 't': /* list topmost */ 107 topmost = B_TRUE; 108 break; 109 110 default: 111 (void) fprintf(stderr, USAGE, Cmd_namep); 112 return (ERR_USAGE); 113 } 114 } 115 116 if (optind < argc) { 117 (void) fprintf(stderr, USAGE, Cmd_namep); 118 return (ERR_USAGE); 119 } 120 } 121 122 if (topmost && mod_present) { 123 (void) fprintf(stderr, 124 "%s: [-t] and [-m] options cannot be used together\n", 125 Cmd_namep); 126 (void) fprintf(stderr, USAGE, Cmd_namep); 127 return (ERR_USAGE); 128 } 129 130 /* 131 * get number of modules on stream 132 * allocate more room if needed 133 */ 134 if ((i = ioctl(STDIN_FILENO, I_LIST, NULL)) < 0) { 135 perror("I_LIST"); 136 (void) fprintf(stderr, 137 "%s: I_LIST ioctl failed\n", Cmd_namep); 138 return (ERR_STDIN); 139 } 140 if (i > strlist.sl_nmods) 141 if (more_modules(&strlist, i) != SUCCESS) 142 return (ERR_MEM); 143 144 /* 145 * get list of modules on stream 146 */ 147 strlist.sl_nmods = i; 148 if (ioctl(STDIN_FILENO, I_LIST, &strlist) < 0) { 149 perror("I_LIST"); 150 (void) fprintf(stderr, "%s: I_LIST ioctl failed\n", Cmd_namep); 151 return (ERR_STDIN); 152 } 153 154 /* 155 * list topmost module 156 */ 157 if (topmost) { 158 if (strlist.sl_nmods >= 2) { 159 (void) puts(strlist.sl_modlist[0].l_name); 160 return (SUCCESS); 161 } 162 return (ERR_MODULE); 163 } 164 165 /* 166 * check if module is present 167 */ 168 if (mod_present) { 169 for (i = 0; i < strlist.sl_nmods; i++) { 170 if (strncmp(modp, strlist.sl_modlist[i].l_name, 171 FMNAMESZ) == 0) { 172 (void) puts("yes"); 173 return (SUCCESS); 174 } 175 } 176 (void) puts("no"); 177 return (ERR_MODULE); 178 } 179 180 /* 181 * print names of all modules and topmost driver on stream 182 */ 183 for (i = 0; i < strlist.sl_nmods; i++) 184 (void) puts(strlist.sl_modlist[i].l_name); 185 return (SUCCESS); 186 } 187 188 /* 189 * more_modules(listp, n) allocate space for 'n' modules in 'listp' 190 * 191 * returns: SUCCESS or FAILURE 192 */ 193 194 static int 195 more_modules(struct str_list *listp, int n) 196 { 197 int i; 198 struct str_mlist *modp; 199 200 if (n > MAXMODULES) { 201 (void) fprintf(stderr, 202 "%s: too many modules (%d) -- max is %d\n", 203 Cmd_namep, n, MAXMODULES); 204 return (FAILURE); 205 } 206 207 if ((modp = calloc(n, sizeof (struct str_mlist))) == NULL) { 208 perror("calloc"); 209 (void) fprintf(stderr, 210 "%s: failed to allocate space for module list\n", 211 Cmd_namep); 212 return (FAILURE); 213 } 214 215 for (i = 0; i < listp->sl_nmods; ++i) 216 (void) strncpy(modp[i].l_name, listp->sl_modlist[i].l_name, 217 FMNAMESZ); 218 listp->sl_nmods = n; 219 listp->sl_modlist = modp; 220 return (SUCCESS); 221 } 222