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192.168.1.100 / T106_DC / 6ba9e9eb6845540c055499be71fb1406bb91b510 / . / ap / libc / glibc / glibc-2.23 / posix / sysconf.c
blob: 01d9283bf5d9bdc216b4ac15b850160a652d6241 [file] [log] [blame]
xf.libdd93d52023-05-12 07:10:14 -0700[diff] [blame]1/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <grp.h>
20#include <pwd.h>
21#include <stdio.h>
22#include <unistd.h>
23#include <time.h>
24#include <limits.h>
25#include <sys/param.h>
26#include <sys/sysinfo.h>
27
28
29/* Get the value of the system variable NAME. */
30long int
31__sysconf (int name)
32{
33 switch (name)
34 {
35 default:
36 __set_errno (EINVAL);
37 return -1;
38
39 case _SC_TZNAME_MAX:
40 return MAX (__tzname_max (), _POSIX_TZNAME_MAX);
41
42 case _SC_CHARCLASS_NAME_MAX:
43#ifdef CHARCLASS_NAME_MAX
44 return CHARCLASS_NAME_MAX;
45#else
46 return -1;
47#endif
48
49 case _SC_COLL_WEIGHTS_MAX:
50#ifdef COLL_WEIGHTS_MAX
51 return COLL_WEIGHTS_MAX;
52#else
53 return -1;
54#endif
55
56 case _SC_EQUIV_CLASS_MAX:
57#ifdef EQUIV_CLASS_MAX
58 return EQUIV_CLASS_MAX;
59#else
60 return -1;
61#endif
62
63 case _SC_2_LOCALEDEF:
64#ifdef _POSIX2_LOCALEDEF
65 return _POSIX2_LOCALEDEF;
66#else
67 return -1;
68#endif
69
70 case _SC_NPROCESSORS_CONF:
71 return __get_nprocs_conf ();
72
73 case _SC_NPROCESSORS_ONLN:
74 return __get_nprocs ();
75
76 case _SC_PHYS_PAGES:
77 return __get_phys_pages ();
78
79 case _SC_AVPHYS_PAGES:
80 return __get_avphys_pages ();
81
82 case _SC_ATEXIT_MAX:
83 /* We have no limit since we use lists. */
84 return INT_MAX;
85
86 case _SC_PASS_MAX:
87 /* We have no limit but since the return value might be used to
88 allocate a buffer we restrict the value. */
89 return BUFSIZ;
90
91 case _SC_CHAR_BIT:
92 return CHAR_BIT;
93
94 case _SC_CHAR_MAX:
95 return CHAR_MAX;
96
97 case _SC_CHAR_MIN:
98 return CHAR_MIN;
99
100 case _SC_INT_MAX:
101 return INT_MAX;
102
103 case _SC_INT_MIN:
104 return INT_MIN;
105
106 case _SC_LONG_BIT:
107 return sizeof (long int) * CHAR_BIT;
108
109 case _SC_WORD_BIT:
110 return sizeof (int) * CHAR_BIT;
111
112 case _SC_MB_LEN_MAX:
113 return MB_LEN_MAX;
114
115 case _SC_NZERO:
116 return NZERO;
117
118 case _SC_SSIZE_MAX:
119 return _POSIX_SSIZE_MAX;
120
121 case _SC_SCHAR_MAX:
122 return SCHAR_MAX;
123
124 case _SC_SCHAR_MIN:
125 return SCHAR_MIN;
126
127 case _SC_SHRT_MAX:
128 return SHRT_MAX;
129
130 case _SC_SHRT_MIN:
131 return SHRT_MIN;
132
133 case _SC_UCHAR_MAX:
134 return UCHAR_MAX;
135
136 case _SC_UINT_MAX:
137 return UINT_MAX;
138
139 case _SC_ULONG_MAX:
140 return ULONG_MAX;
141
142 case _SC_USHRT_MAX:
143 return USHRT_MAX;
144
145 case _SC_GETGR_R_SIZE_MAX:
146 return NSS_BUFLEN_GROUP;
147
148 case _SC_GETPW_R_SIZE_MAX:
149 return NSS_BUFLEN_PASSWD;
150
151 case _SC_ARG_MAX:
152 case _SC_CHILD_MAX:
153 case _SC_CLK_TCK:
154 case _SC_NGROUPS_MAX:
155 case _SC_OPEN_MAX:
156 case _SC_STREAM_MAX:
157 case _SC_JOB_CONTROL:
158 case _SC_SAVED_IDS:
159 case _SC_REALTIME_SIGNALS:
160 case _SC_PRIORITY_SCHEDULING:
161 case _SC_TIMERS:
162 case _SC_ASYNCHRONOUS_IO:
163 case _SC_PRIORITIZED_IO:
164 case _SC_SYNCHRONIZED_IO:
165 case _SC_FSYNC:
166 case _SC_MAPPED_FILES:
167 case _SC_MEMLOCK:
168 case _SC_MEMLOCK_RANGE:
169 case _SC_MEMORY_PROTECTION:
170 case _SC_MESSAGE_PASSING:
171 case _SC_SEMAPHORES:
172 case _SC_SHARED_MEMORY_OBJECTS:
173
174 case _SC_AIO_LISTIO_MAX:
175 case _SC_AIO_MAX:
176 case _SC_AIO_PRIO_DELTA_MAX:
177 case _SC_DELAYTIMER_MAX:
178 case _SC_MQ_OPEN_MAX:
179 case _SC_MQ_PRIO_MAX:
180 case _SC_VERSION:
181 case _SC_PAGESIZE:
182 case _SC_RTSIG_MAX:
183 case _SC_SEM_NSEMS_MAX:
184 case _SC_SEM_VALUE_MAX:
185 case _SC_SIGQUEUE_MAX:
186 case _SC_TIMER_MAX:
187
188 case _SC_PII:
189 case _SC_PII_XTI:
190 case _SC_PII_SOCKET:
191 case _SC_PII_OSI:
192 case _SC_POLL:
193 case _SC_SELECT:
194 case _SC_UIO_MAXIOV:
195 case _SC_PII_INTERNET_STREAM:
196 case _SC_PII_INTERNET_DGRAM:
197 case _SC_PII_OSI_COTS:
198 case _SC_PII_OSI_CLTS:
199 case _SC_PII_OSI_M:
200 case _SC_T_IOV_MAX:
201
202 case _SC_BC_BASE_MAX:
203 case _SC_BC_DIM_MAX:
204 case _SC_BC_SCALE_MAX:
205 case _SC_BC_STRING_MAX:
206 case _SC_EXPR_NEST_MAX:
207 case _SC_LINE_MAX:
208 case _SC_RE_DUP_MAX:
209 case _SC_2_VERSION:
210 case _SC_2_C_BIND:
211 case _SC_2_C_DEV:
212 case _SC_2_FORT_DEV:
213 case _SC_2_SW_DEV:
214 case _SC_2_CHAR_TERM:
215 case _SC_2_C_VERSION:
216 case _SC_2_UPE:
217
218 case _SC_THREADS:
219 case _SC_THREAD_SAFE_FUNCTIONS:
220 case _SC_LOGIN_NAME_MAX:
221 case _SC_TTY_NAME_MAX:
222 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
223 case _SC_THREAD_KEYS_MAX:
224 case _SC_THREAD_STACK_MIN:
225 case _SC_THREAD_THREADS_MAX:
226 case _SC_THREAD_ATTR_STACKADDR:
227 case _SC_THREAD_ATTR_STACKSIZE:
228 case _SC_THREAD_PRIORITY_SCHEDULING:
229 case _SC_THREAD_PRIO_INHERIT:
230 case _SC_THREAD_PRIO_PROTECT:
231 case _SC_THREAD_PROCESS_SHARED:
232
233 case _SC_XOPEN_VERSION:
234 case _SC_XOPEN_XCU_VERSION:
235 case _SC_XOPEN_UNIX:
236 case _SC_XOPEN_CRYPT:
237 case _SC_XOPEN_ENH_I18N:
238 case _SC_XOPEN_SHM:
239 case _SC_XOPEN_XPG2:
240 case _SC_XOPEN_XPG3:
241 case _SC_XOPEN_XPG4:
242
243 case _SC_NL_ARGMAX:
244 case _SC_NL_LANGMAX:
245 case _SC_NL_MSGMAX:
246 case _SC_NL_NMAX:
247 case _SC_NL_SETMAX:
248 case _SC_NL_TEXTMAX:
249
250 case _SC_XBS5_ILP32_OFF32:
251 case _SC_XBS5_ILP32_OFFBIG:
252 case _SC_XBS5_LP64_OFF64:
253 case _SC_XBS5_LPBIG_OFFBIG:
254
255 case _SC_POSIX_V6_ILP32_OFF32:
256 case _SC_POSIX_V6_ILP32_OFFBIG:
257 case _SC_POSIX_V6_LP64_OFF64:
258 case _SC_POSIX_V6_LPBIG_OFFBIG:
259
260 case _SC_POSIX_V7_ILP32_OFF32:
261 case _SC_POSIX_V7_ILP32_OFFBIG:
262 case _SC_POSIX_V7_LP64_OFF64:
263 case _SC_POSIX_V7_LPBIG_OFFBIG:
264
265 case _SC_XOPEN_LEGACY:
266 case _SC_XOPEN_REALTIME:
267 case _SC_XOPEN_REALTIME_THREADS:
268
269 break;
270 }
271
272 __set_errno (ENOSYS);
273 return -1;
274}
275
276weak_alias (__sysconf, sysconf)
277libc_hidden_def (__sysconf)
278
279stub_warning (sysconf)