1 /* Copyright (C) 1991-2021 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    <https://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.  */
30 long int
__sysconf(int name)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 -1;
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     case _SC_MINSIGSTKSZ:
270     case _SC_SIGSTKSZ:
271 
272       break;
273     }
274 
275   __set_errno (ENOSYS);
276   return -1;
277 }
278 
279 weak_alias (__sysconf, sysconf)
280 libc_hidden_def (__sysconf)
281 
282 stub_warning (sysconf)
283