1 /* 2 * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $DragonFly: src/bin/varsym/varsym.c,v 1.4 2003/12/11 20:33:49 dillon Exp $ 27 */ 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <errno.h> 33 #include <unistd.h> 34 #include <sys/varsym.h> 35 36 static void dumpvars(char *buf, int bytes); 37 static int doexec(char **av); 38 static void usage(void); 39 40 int 41 main(int ac, char **av) 42 { 43 int i; 44 int mask = VARSYM_ALL_MASK; 45 int level = VARSYM_USER; 46 int deleteOpt = 0; 47 int verboseOpt = 1; 48 int allOpt = 0; 49 int execok = 0; 50 int ret = 0; 51 52 while ((i = getopt(ac, av, "adhpqsux")) != -1) { 53 switch (i) { 54 case 'a': 55 allOpt = 1; 56 break; 57 case 'd': 58 deleteOpt = 1; 59 break; 60 case 'p': 61 mask = VARSYM_PROC_MASK; 62 level = VARSYM_PROC; 63 break; 64 case 'q': 65 verboseOpt = 0; 66 break; 67 case 's': 68 mask = VARSYM_SYS_MASK; 69 level = VARSYM_SYS; 70 break; 71 case 'u': 72 mask = VARSYM_USER_MASK; 73 level = VARSYM_USER; 74 break; 75 case 'x': 76 mask = VARSYM_PROC_MASK; 77 level = VARSYM_PROC; 78 execok = 1; 79 break; 80 case 'h': 81 default: 82 usage(); 83 return(-1); 84 } 85 } 86 87 if (allOpt) { 88 char buf[1024]; 89 int marker = 0; 90 int bytes; 91 92 for (;;) { 93 bytes = varsym_list(level, buf, sizeof(buf), &marker); 94 if (bytes < 0) /* error occured */ 95 break; 96 dumpvars(buf, bytes); 97 if (marker < 0) /* no more vars */ 98 break; 99 } 100 if (bytes < 0) { 101 fprintf(stderr, "varsym_list(): %s\n", strerror(errno)); 102 return 1; 103 } 104 } 105 106 for ( ; optind < ac; optind++) { 107 char *name = av[optind]; 108 char *data = strchr(name, '='); 109 int error; 110 char buf[MAXVARSYM_DATA]; 111 112 if (data) 113 *data++ = 0; 114 115 if (execok) { 116 if (deleteOpt) { 117 usage(); 118 exit(1); 119 } 120 if (data) { 121 error = varsym_set(level, name, data); 122 if (error) 123 ret = 2; 124 } else { 125 error = doexec(av + optind); 126 } 127 } else if (deleteOpt) { 128 error = varsym_set(level, name, NULL); 129 if (error) 130 ret = 2; 131 } else if (data) { 132 error = varsym_set(level, name, data); 133 if (error) 134 ret = 2; 135 } else { 136 /* 137 * NOTE: System call returns 0 on success now, 138 * but older versions returns the content 139 * strlen() + 1, and that had to be tested 140 * for overflow conditions. 141 */ 142 error = varsym_get(mask, name, buf, sizeof(buf)); 143 if (error >= 0 && error <= (int)sizeof(buf)) { 144 if (verboseOpt) 145 printf("%s=", name); 146 printf("%s\n", buf); 147 } else { 148 ret = 1; 149 } 150 } 151 if (error < 0 && verboseOpt) 152 fprintf(stderr, "%s: %s\n", name, strerror(errno)); 153 } 154 155 return ret; 156 } 157 158 static void 159 dumpvars(char *buf, int bytes) 160 { 161 int b; 162 int i; 163 char *vname = NULL; 164 char *vdata = NULL; 165 166 for (b = i = 0; i < bytes; ++i) { 167 if (buf[i] == 0) { 168 if (vname == NULL) { 169 vname = buf + b; 170 } else { 171 vdata = buf + b; 172 printf("%s=%s\n", vname, vdata); 173 vname = vdata = NULL; 174 } 175 b = i + 1; 176 } 177 } 178 } 179 180 static int 181 doexec(char **av) 182 { 183 int error; 184 185 error = execvp(av[0], av); 186 return (error); 187 } 188 189 static void 190 usage(void) 191 { 192 fprintf(stderr, "usage: varsym [-adpqsu] [var[=data] ...]\n"); 193 } 194 195