sysconf.c revision 1.1
1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Sean Eric Fagan of Cygnus Support. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)sysconf.c 8.2 (Berkeley) 3/20/94"; 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <sys/param.h> 42 #include <sys/sysctl.h> 43 #include <sys/time.h> 44 #include <sys/resource.h> 45 46 #include <errno.h> 47 #include <unistd.h> 48 49 /* 50 * sysconf -- 51 * get configurable system variables. 52 * 53 * XXX 54 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values 55 * not change during the lifetime of the calling process. This would seem 56 * to require that any change to system limits kill all running processes. 57 * A workaround might be to cache the values when they are first retrieved 58 * and then simply return the cached value on subsequent calls. This is 59 * less useful than returning up-to-date values, however. 60 */ 61 long 62 sysconf(name) 63 int name; 64 { 65 struct clockinfo clk; 66 struct rlimit rl; 67 size_t len; 68 int mib[2], value; 69 70 len = sizeof(value); 71 72 switch (name) { 73 /* 1003.1 */ 74 case _SC_ARG_MAX: 75 mib[0] = CTL_KERN; 76 mib[1] = KERN_ARGMAX; 77 break; 78 case _SC_CHILD_MAX: 79 return (getrlimit(RLIMIT_NPROC, &rl) ? -1 : rl.rlim_cur); 80 case _SC_CLK_TCK: 81 return (CLK_TCK); 82 case _SC_JOB_CONTROL: 83 mib[0] = CTL_KERN; 84 mib[1] = KERN_JOB_CONTROL; 85 goto yesno; 86 case _SC_NGROUPS_MAX: 87 mib[0] = CTL_KERN; 88 mib[1] = KERN_NGROUPS; 89 break; 90 case _SC_OPEN_MAX: 91 return (getrlimit(RLIMIT_NOFILE, &rl) ? -1 : rl.rlim_cur); 92 case _SC_STREAM_MAX: 93 mib[0] = CTL_USER; 94 mib[1] = USER_STREAM_MAX; 95 break; 96 case _SC_TZNAME_MAX: 97 mib[0] = CTL_USER; 98 mib[1] = USER_TZNAME_MAX; 99 break; 100 case _SC_SAVED_IDS: 101 mib[0] = CTL_KERN; 102 mib[1] = KERN_SAVED_IDS; 103 goto yesno; 104 case _SC_VERSION: 105 mib[0] = CTL_KERN; 106 mib[1] = KERN_POSIX1; 107 break; 108 109 /* 1003.2 */ 110 case _SC_BC_BASE_MAX: 111 mib[0] = CTL_USER; 112 mib[1] = USER_BC_BASE_MAX; 113 break; 114 case _SC_BC_DIM_MAX: 115 mib[0] = CTL_USER; 116 mib[1] = USER_BC_DIM_MAX; 117 break; 118 case _SC_BC_SCALE_MAX: 119 mib[0] = CTL_USER; 120 mib[1] = USER_BC_SCALE_MAX; 121 break; 122 case _SC_BC_STRING_MAX: 123 mib[0] = CTL_USER; 124 mib[1] = USER_BC_STRING_MAX; 125 break; 126 case _SC_COLL_WEIGHTS_MAX: 127 mib[0] = CTL_USER; 128 mib[1] = USER_COLL_WEIGHTS_MAX; 129 break; 130 case _SC_EXPR_NEST_MAX: 131 mib[0] = CTL_USER; 132 mib[1] = USER_EXPR_NEST_MAX; 133 break; 134 case _SC_LINE_MAX: 135 mib[0] = CTL_USER; 136 mib[1] = USER_LINE_MAX; 137 break; 138 case _SC_RE_DUP_MAX: 139 mib[0] = CTL_USER; 140 mib[1] = USER_RE_DUP_MAX; 141 break; 142 case _SC_2_VERSION: 143 mib[0] = CTL_USER; 144 mib[1] = USER_POSIX2_VERSION; 145 break; 146 case _SC_2_C_BIND: 147 mib[0] = CTL_USER; 148 mib[1] = USER_POSIX2_C_BIND; 149 goto yesno; 150 case _SC_2_C_DEV: 151 mib[0] = CTL_USER; 152 mib[1] = USER_POSIX2_C_DEV; 153 goto yesno; 154 case _SC_2_CHAR_TERM: 155 mib[0] = CTL_USER; 156 mib[1] = USER_POSIX2_CHAR_TERM; 157 goto yesno; 158 case _SC_2_FORT_DEV: 159 mib[0] = CTL_USER; 160 mib[1] = USER_POSIX2_FORT_DEV; 161 goto yesno; 162 case _SC_2_FORT_RUN: 163 mib[0] = CTL_USER; 164 mib[1] = USER_POSIX2_FORT_RUN; 165 goto yesno; 166 case _SC_2_LOCALEDEF: 167 mib[0] = CTL_USER; 168 mib[1] = USER_POSIX2_LOCALEDEF; 169 goto yesno; 170 case _SC_2_SW_DEV: 171 mib[0] = CTL_USER; 172 mib[1] = USER_POSIX2_SW_DEV; 173 goto yesno; 174 case _SC_2_UPE: 175 mib[0] = CTL_USER; 176 mib[1] = USER_POSIX2_UPE; 177 yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) 178 return (-1); 179 if (value == 0) 180 return (-1); 181 return (value); 182 break; 183 default: 184 errno = EINVAL; 185 return (-1); 186 } 187 return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value); 188 } 189
Indexes created Thu Sep 25 16:09:42 GMT 2025