projects / unix-history / blame
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1 | /*- |
| 2 | * Copyright (c) 1993 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * Sean Eric Fagan of Cygnus Support. | |
| 7 | * | |
| 8 | * %sccs.include.redist.c% | |
| 9 | */ | |
| 10 | ||
| 11 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 67f52e00 | 12 | static char sccsid[] = "@(#)sysconf.c 5.2 (Berkeley) %G%"; |
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13 | #endif /* LIBC_SCCS and not lint */ |
| 14 | ||
| 15 | #include <sys/param.h> | |
| 16 | #include <sys/sysctl.h> | |
| 17 | ||
| 18 | #include <errno.h> | |
| 19 | #include <unistd.h> | |
| 20 | ||
| 67f52e00 KB |
21 | /* |
| 22 | * sysconf -- | |
| 23 | * get configurable system variables. | |
| 24 | * | |
| 25 | * XXX | |
| 26 | * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values | |
| 27 | * not change during the lifetime of the calling process. This would seem | |
| 28 | * to require that any change to system limits kill all running processes. | |
| 29 | * A workaround might be to cache the values when they are first retrieved | |
| 30 | * and then simply return the cached value on subsequent calls. This is | |
| 31 | * less useful than returning up-to-date values, however. | |
| 32 | */ | |
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33 | long |
| 34 | sysconf(name) | |
| 35 | int name; | |
| 36 | { | |
| 37 | struct clockinfo clk; | |
| 38 | size_t len; | |
| 39 | int mib[2], value; | |
| 40 | ||
| 67f52e00 KB |
41 | len = sizeof(value); |
| 42 | ||
| 2704d6f3 | 43 | switch (name) { |
| 67f52e00 | 44 | /* 1003.1 */ |
| 2704d6f3 KB |
45 | case _SC_ARG_MAX: |
| 46 | mib[0] = CTL_KERN; | |
| 47 | mib[1] = KERN_ARGMAX; | |
| 48 | break; | |
| 49 | case _SC_CHILD_MAX: | |
| 50 | mib[0] = CTL_KERN; | |
| 67f52e00 | 51 | mib[1] = KERN_MAXUPROC; |
| 2704d6f3 KB |
52 | break; |
| 53 | case _SC_CLK_TCK: | |
| 67f52e00 KB |
54 | return (CLK_TCK); |
| 55 | case _SC_JOB_CONTROL: | |
| 2704d6f3 | 56 | mib[0] = CTL_KERN; |
| 67f52e00 KB |
57 | mib[1] = KERN_JOB_CONTROL; |
| 58 | goto yesno; | |
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59 | case _SC_NGROUPS_MAX: |
| 60 | mib[0] = CTL_KERN; | |
| 61 | mib[1] = KERN_NGROUPS; | |
| 62 | break; | |
| 63 | case _SC_OPEN_MAX: | |
| 64 | mib[0] = CTL_KERN; | |
| 67f52e00 | 65 | mib[1] = KERN_MAXUFILES; |
| 2704d6f3 | 66 | break; |
| 67f52e00 KB |
67 | case _SC_STREAM_MAX: |
| 68 | mib[0] = CTL_USER; | |
| 69 | mib[1] = USER_STREAM_MAX; | |
| 70 | break; | |
| 71 | case _SC_TZNAME_MAX: | |
| 72 | mib[0] = CTL_USER; | |
| 73 | mib[1] = USER_TZNAME_MAX; | |
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74 | break; |
| 75 | case _SC_SAVED_IDS: | |
| 76 | mib[0] = CTL_KERN; | |
| 77 | mib[1] = KERN_SAVED_IDS; | |
| 67f52e00 | 78 | goto yesno; |
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79 | case _SC_VERSION: |
| 80 | mib[0] = CTL_KERN; | |
| 81 | mib[1] = KERN_POSIX1; | |
| 82 | break; | |
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83 | |
| 84 | /* 1003.2 */ | |
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85 | case _SC_BC_BASE_MAX: |
| 86 | mib[0] = CTL_USER; | |
| 87 | mib[1] = USER_BC_BASE_MAX; | |
| 88 | break; | |
| 89 | case _SC_BC_DIM_MAX: | |
| 90 | mib[0] = CTL_USER; | |
| 91 | mib[1] = USER_BC_DIM_MAX; | |
| 92 | break; | |
| 93 | case _SC_BC_SCALE_MAX: | |
| 94 | mib[0] = CTL_USER; | |
| 95 | mib[1] = USER_BC_SCALE_MAX; | |
| 96 | break; | |
| 97 | case _SC_BC_STRING_MAX: | |
| 98 | mib[0] = CTL_USER; | |
| 99 | mib[1] = USER_BC_STRING_MAX; | |
| 100 | break; | |
| 101 | case _SC_COLL_WEIGHTS_MAX: | |
| 102 | mib[0] = CTL_USER; | |
| 103 | mib[1] = USER_COLL_WEIGHTS_MAX; | |
| 104 | break; | |
| 105 | case _SC_EXPR_NEST_MAX: | |
| 106 | mib[0] = CTL_USER; | |
| 107 | mib[1] = USER_EXPR_NEST_MAX; | |
| 108 | break; | |
| 109 | case _SC_LINE_MAX: | |
| 110 | mib[0] = CTL_USER; | |
| 111 | mib[1] = USER_LINE_MAX; | |
| 112 | break; | |
| 113 | case _SC_RE_DUP_MAX: | |
| 114 | mib[0] = CTL_USER; | |
| 115 | mib[1] = USER_RE_DUP_MAX; | |
| 116 | break; | |
| 117 | case _SC_2_VERSION: | |
| 118 | mib[0] = CTL_USER; | |
| 119 | mib[1] = USER_POSIX2_VERSION; | |
| 120 | break; | |
| 121 | case _SC_2_C_BIND: | |
| 122 | mib[0] = CTL_USER; | |
| 123 | mib[1] = USER_POSIX2_C_BIND; | |
| 67f52e00 | 124 | goto yesno; |
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125 | case _SC_2_C_DEV: |
| 126 | mib[0] = CTL_USER; | |
| 127 | mib[1] = USER_POSIX2_C_DEV; | |
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128 | goto yesno; |
| 129 | case _SC_2_CHAR_TERM: | |
| 130 | mib[0] = CTL_USER; | |
| 131 | mib[1] = USER_POSIX2_CHAR_TERM; | |
| 132 | goto yesno; | |
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133 | case _SC_2_FORT_DEV: |
| 134 | mib[0] = CTL_USER; | |
| 135 | mib[1] = USER_POSIX2_FORT_DEV; | |
| 67f52e00 | 136 | goto yesno; |
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137 | case _SC_2_FORT_RUN: |
| 138 | mib[0] = CTL_USER; | |
| 139 | mib[1] = USER_POSIX2_FORT_RUN; | |
| 67f52e00 | 140 | goto yesno; |
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141 | case _SC_2_LOCALEDEF: |
| 142 | mib[0] = CTL_USER; | |
| 143 | mib[1] = USER_POSIX2_LOCALEDEF; | |
| 67f52e00 | 144 | goto yesno; |
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145 | case _SC_2_SW_DEV: |
| 146 | mib[0] = CTL_USER; | |
| 147 | mib[1] = USER_POSIX2_SW_DEV; | |
| 67f52e00 KB |
148 | goto yesno; |
| 149 | case _SC_2_UPE: | |
| 150 | mib[0] = CTL_USER; | |
| 151 | mib[1] = USER_POSIX2_UPE; | |
| 152 | yesno: if (sysctl(mib, 2, &value, &len, NULL, 0) == -1) | |
| 153 | return (-1); | |
| 154 | if (value == 0) | |
| 155 | return (-1); | |
| 156 | return (value); | |
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157 | break; |
| 158 | default: | |
| 159 | errno = EINVAL; | |
| 160 | return (-1); | |
| 161 | } | |
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162 | return (sysctl(mib, 2, &value, &len, NULL, 0) == -1 ? -1 : value); |
| 163 | } |