1 /* 2 * Copyright 2000 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/usr.bin/getconf/getconf.c 164945 2006-12-06 12:00:26Z maxim $ 30 */ 31 32 #include <sys/types.h> 33 34 #include <err.h> 35 #include <errno.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <sysexits.h> 39 #include <unistd.h> 40 41 #include "getconf.h" 42 43 static void do_confstr(const char *name, int key); 44 static void do_sysconf(const char *name, int key); 45 static void do_pathconf(const char *name, int key, const char *path); 46 47 static void 48 usage(void) 49 { 50 fprintf(stderr, 51 "usage: getconf [-v prog_env] system_var\n" 52 " getconf [-v prog_env] path_var pathname\n"); 53 exit(EX_USAGE); 54 } 55 56 int 57 main(int argc, char **argv) 58 { 59 int c, key, valid; 60 const char *name, *vflag, *alt_path; 61 intmax_t limitval; 62 63 vflag = NULL; 64 while ((c = getopt(argc, argv, "v:")) != -1) { 65 switch (c) { 66 case 'v': 67 vflag = optarg; 68 break; 69 70 default: 71 usage(); 72 } 73 } 74 75 if ((name = argv[optind]) == NULL) 76 usage(); 77 78 if (vflag != NULL) { 79 if ((valid = find_progenv(vflag, &alt_path)) == 0) 80 errx(EX_USAGE, "invalid programming environment %s", 81 vflag); 82 if (valid > 0 && alt_path != NULL) { 83 if (argv[optind + 1] == NULL) 84 execl(alt_path, "getconf", argv[optind], 85 NULL); 86 else 87 execl(alt_path, "getconf", argv[optind], 88 argv[optind + 1], NULL); 89 90 err(EX_OSERR, "execl: %s", alt_path); 91 } 92 if (valid < 0) 93 errx(EX_UNAVAILABLE, "environment %s is not available", 94 vflag); 95 } 96 97 if (argv[optind + 1] == NULL) { /* confstr or sysconf */ 98 if ((valid = find_limit(name, &limitval)) != 0) { 99 if (valid > 0) 100 printf("%" PRIdMAX "\n", limitval); 101 else 102 printf("undefined\n"); 103 104 return 0; 105 } 106 if ((valid = find_confstr(name, &key)) != 0) { 107 if (valid > 0) 108 do_confstr(name, key); 109 else 110 printf("undefined\n"); 111 } else { 112 valid = find_sysconf(name, &key); 113 if (valid > 0) { 114 do_sysconf(name, key); 115 } else if (valid < 0) { 116 printf("undefined\n"); 117 } else 118 errx(EX_USAGE, 119 "no such configuration parameter `%s'", 120 name); 121 } 122 } else { 123 valid = find_pathconf(name, &key); 124 if (valid != 0) { 125 if (valid > 0) 126 do_pathconf(name, key, argv[optind + 1]); 127 else 128 printf("undefined\n"); 129 } else 130 errx(EX_USAGE, 131 "no such path configuration parameter `%s'", 132 name); 133 } 134 return 0; 135 } 136 137 static void 138 do_confstr(const char *name, int key) 139 { 140 size_t len; 141 int savederr; 142 143 savederr = errno; 144 errno = 0; 145 len = confstr(key, 0, 0); 146 if (len == 0) { 147 if (errno) 148 err(EX_OSERR, "confstr: %s", name); 149 else 150 printf("undefined\n"); 151 } else { 152 char buf[len + 1]; 153 154 confstr(key, buf, len); 155 printf("%s\n", buf); 156 } 157 errno = savederr; 158 } 159 160 static void 161 do_sysconf(const char *name, int key) 162 { 163 long value; 164 165 errno = 0; 166 value = sysconf(key); 167 if (value == -1 && errno != 0) 168 err(EX_OSERR, "sysconf: %s", name); 169 else if (value == -1) 170 printf("undefined\n"); 171 else 172 printf("%ld\n", value); 173 } 174 175 static void 176 do_pathconf(const char *name, int key, const char *path) 177 { 178 long value; 179 180 errno = 0; 181 value = pathconf(path, key); 182 if (value == -1 && errno != 0) 183 err(EX_OSERR, "pathconf: %s", name); 184 else if (value == -1) 185 printf("undefined\n"); 186 else 187 printf("%ld\n", value); 188 } 189 190