master
1#include <unistd.h>
2#include <limits.h>
3#include <errno.h>
4#ifdef __wasilibc_unmodified_upstream // WASI has no process-level accounting
5#include <sys/resource.h>
6#endif
7#ifdef __wasilibc_unmodified_upstream // WASI has no realtime signals
8#include <signal.h>
9#endif
10#include <sys/sysinfo.h>
11#ifdef __wasilibc_unmodified_upstream
12#include <sys/auxv.h>
13#include "syscall.h"
14#endif
15#include "libc.h"
16
17#define JT(x) (-256|(x))
18#define VER JT(1)
19#define JT_ARG_MAX JT(2)
20#ifdef __wasilibc_unmodified_upstream // WASI has no mq
21#define JT_MQ_PRIO_MAX JT(3)
22#endif
23#define JT_PAGE_SIZE JT(4)
24#ifdef __wasilibc_unmodified_upstream // WASI has no semaphores
25#define JT_SEM_VALUE_MAX JT(5)
26#endif
27#define JT_NPROCESSORS_CONF JT(6)
28#define JT_NPROCESSORS_ONLN JT(7)
29#define JT_PHYS_PAGES JT(8)
30#define JT_AVPHYS_PAGES JT(9)
31#define JT_ZERO JT(10)
32#define JT_DELAYTIMER_MAX JT(11)
33#define JT_MINSIGSTKSZ JT(12)
34#define JT_SIGSTKSZ JT(13)
35
36#define RLIM(x) (-32768|(RLIMIT_ ## x))
37
38long sysconf(int name)
39{
40 static const short values[] = {
41 [_SC_ARG_MAX] = JT_ARG_MAX,
42#ifdef __wasilibc_unmodified_upstream // WASI has no processes
43 [_SC_CHILD_MAX] = RLIM(NPROC),
44#else
45 // Not supported on wasi.
46 [_SC_CHILD_MAX] = -1,
47#endif
48 [_SC_CLK_TCK] = 100,
49 [_SC_NGROUPS_MAX] = 32,
50#ifdef __wasilibc_unmodified_upstream // WASI has no rlimit
51 [_SC_OPEN_MAX] = RLIM(NOFILE),
52#else
53 // Rlimit is not supported on wasi.
54 [_SC_OPEN_MAX] = -1,
55#endif
56
57 [_SC_STREAM_MAX] = -1,
58 [_SC_TZNAME_MAX] = TZNAME_MAX,
59 [_SC_JOB_CONTROL] = 1,
60 [_SC_SAVED_IDS] = 1,
61 [_SC_REALTIME_SIGNALS] = VER,
62 [_SC_PRIORITY_SCHEDULING] = -1,
63 [_SC_TIMERS] = VER,
64 [_SC_ASYNCHRONOUS_IO] = VER,
65 [_SC_PRIORITIZED_IO] = -1,
66 [_SC_SYNCHRONIZED_IO] = -1,
67 [_SC_FSYNC] = VER,
68 [_SC_MAPPED_FILES] = VER,
69 [_SC_MEMLOCK] = VER,
70 [_SC_MEMLOCK_RANGE] = VER,
71 [_SC_MEMORY_PROTECTION] = VER,
72 [_SC_MESSAGE_PASSING] = VER,
73 [_SC_SEMAPHORES] = VER,
74 [_SC_SHARED_MEMORY_OBJECTS] = VER,
75 [_SC_AIO_LISTIO_MAX] = -1,
76 [_SC_AIO_MAX] = -1,
77 [_SC_AIO_PRIO_DELTA_MAX] = JT_ZERO, /* ?? */
78 [_SC_DELAYTIMER_MAX] = JT_DELAYTIMER_MAX,
79#ifdef __wasilibc_unmodified_upstream // WASI has no mq
80 [_SC_MQ_OPEN_MAX] = -1,
81 [_SC_MQ_PRIO_MAX] = JT_MQ_PRIO_MAX,
82#endif
83 [_SC_VERSION] = VER,
84 [_SC_PAGE_SIZE] = JT_PAGE_SIZE,
85#ifdef __wasilibc_unmodified_upstream // WASI has no realtime signals
86 [_SC_RTSIG_MAX] = _NSIG - 1 - 31 - 3,
87#else
88 // Not supported on wasi.
89 [_SC_RTSIG_MAX] = -1,
90#endif
91#ifdef __wasilibc_unmodified_upstream // WASI has no semaphores
92 [_SC_SEM_NSEMS_MAX] = SEM_NSEMS_MAX,
93 [_SC_SEM_VALUE_MAX] = JT_SEM_VALUE_MAX,
94#else
95 [_SC_SEM_NSEMS_MAX] = -1,
96 [_SC_SEM_VALUE_MAX] = -1,
97#endif
98 [_SC_SIGQUEUE_MAX] = -1,
99 [_SC_TIMER_MAX] = -1,
100#ifdef __wasilibc_unmodified_upstream // WASI has no shell commands
101 [_SC_BC_BASE_MAX] = _POSIX2_BC_BASE_MAX,
102 [_SC_BC_DIM_MAX] = _POSIX2_BC_DIM_MAX,
103 [_SC_BC_SCALE_MAX] = _POSIX2_BC_SCALE_MAX,
104 [_SC_BC_STRING_MAX] = _POSIX2_BC_STRING_MAX,
105#else
106 [_SC_BC_BASE_MAX] = -1,
107 [_SC_BC_DIM_MAX] = -1,
108 [_SC_BC_SCALE_MAX] = -1,
109 [_SC_BC_STRING_MAX] = -1,
110#endif
111 [_SC_COLL_WEIGHTS_MAX] = COLL_WEIGHTS_MAX,
112 [_SC_EXPR_NEST_MAX] = -1,
113 [_SC_LINE_MAX] = -1,
114 [_SC_RE_DUP_MAX] = RE_DUP_MAX,
115 [_SC_2_VERSION] = VER,
116 [_SC_2_C_BIND] = VER,
117 [_SC_2_C_DEV] = -1,
118 [_SC_2_FORT_DEV] = -1,
119 [_SC_2_FORT_RUN] = -1,
120 [_SC_2_SW_DEV] = -1,
121 [_SC_2_LOCALEDEF] = -1,
122 [_SC_IOV_MAX] = IOV_MAX,
123 [_SC_THREADS] = VER,
124 [_SC_THREAD_SAFE_FUNCTIONS] = VER,
125 [_SC_GETGR_R_SIZE_MAX] = -1,
126 [_SC_GETPW_R_SIZE_MAX] = -1,
127 [_SC_LOGIN_NAME_MAX] = 256,
128 [_SC_TTY_NAME_MAX] = TTY_NAME_MAX,
129#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
130 [_SC_THREAD_DESTRUCTOR_ITERATIONS] = PTHREAD_DESTRUCTOR_ITERATIONS,
131 [_SC_THREAD_KEYS_MAX] = PTHREAD_KEYS_MAX,
132 [_SC_THREAD_STACK_MIN] = PTHREAD_STACK_MIN,
133#else
134 [_SC_THREAD_DESTRUCTOR_ITERATIONS] = -1,
135 [_SC_THREAD_KEYS_MAX] = -1,
136 [_SC_THREAD_STACK_MIN] = -1,
137#endif
138 [_SC_THREAD_THREADS_MAX] = -1,
139 [_SC_THREAD_ATTR_STACKADDR] = VER,
140 [_SC_THREAD_ATTR_STACKSIZE] = VER,
141 [_SC_THREAD_PRIORITY_SCHEDULING] = VER,
142 [_SC_THREAD_PRIO_INHERIT] = -1,
143 [_SC_THREAD_PRIO_PROTECT] = -1,
144 [_SC_THREAD_PROCESS_SHARED] = VER,
145 [_SC_NPROCESSORS_CONF] = JT_NPROCESSORS_CONF,
146 [_SC_NPROCESSORS_ONLN] = JT_NPROCESSORS_ONLN,
147 [_SC_PHYS_PAGES] = JT_PHYS_PAGES,
148 [_SC_AVPHYS_PAGES] = JT_AVPHYS_PAGES,
149 [_SC_ATEXIT_MAX] = -1,
150 [_SC_PASS_MAX] = -1,
151 [_SC_XOPEN_VERSION] = _XOPEN_VERSION,
152 [_SC_XOPEN_XCU_VERSION] = _XOPEN_VERSION,
153 [_SC_XOPEN_UNIX] = 1,
154 [_SC_XOPEN_CRYPT] = -1,
155 [_SC_XOPEN_ENH_I18N] = 1,
156 [_SC_XOPEN_SHM] = 1,
157 [_SC_2_CHAR_TERM] = -1,
158 [_SC_2_UPE] = -1,
159 [_SC_XOPEN_XPG2] = -1,
160 [_SC_XOPEN_XPG3] = -1,
161 [_SC_XOPEN_XPG4] = -1,
162 [_SC_NZERO] = NZERO,
163 [_SC_XBS5_ILP32_OFF32] = -1,
164 [_SC_XBS5_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : -1,
165 [_SC_XBS5_LP64_OFF64] = sizeof(long)==8 ? 1 : -1,
166 [_SC_XBS5_LPBIG_OFFBIG] = -1,
167 [_SC_XOPEN_LEGACY] = -1,
168 [_SC_XOPEN_REALTIME] = -1,
169 [_SC_XOPEN_REALTIME_THREADS] = -1,
170 [_SC_ADVISORY_INFO] = VER,
171 [_SC_BARRIERS] = VER,
172 [_SC_CLOCK_SELECTION] = VER,
173 [_SC_CPUTIME] = VER,
174 [_SC_THREAD_CPUTIME] = VER,
175 [_SC_MONOTONIC_CLOCK] = VER,
176 [_SC_READER_WRITER_LOCKS] = VER,
177 [_SC_SPIN_LOCKS] = VER,
178 [_SC_REGEXP] = 1,
179 [_SC_SHELL] = 1,
180 [_SC_SPAWN] = VER,
181 [_SC_SPORADIC_SERVER] = -1,
182 [_SC_THREAD_SPORADIC_SERVER] = -1,
183 [_SC_TIMEOUTS] = VER,
184 [_SC_TYPED_MEMORY_OBJECTS] = -1,
185 [_SC_2_PBS] = -1,
186 [_SC_2_PBS_ACCOUNTING] = -1,
187 [_SC_2_PBS_LOCATE] = -1,
188 [_SC_2_PBS_MESSAGE] = -1,
189 [_SC_2_PBS_TRACK] = -1,
190 [_SC_SYMLOOP_MAX] = SYMLOOP_MAX,
191 [_SC_STREAMS] = JT_ZERO,
192 [_SC_2_PBS_CHECKPOINT] = -1,
193 [_SC_V6_ILP32_OFF32] = -1,
194 [_SC_V6_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : -1,
195 [_SC_V6_LP64_OFF64] = sizeof(long)==8 ? 1 : -1,
196 [_SC_V6_LPBIG_OFFBIG] = -1,
197 [_SC_HOST_NAME_MAX] = HOST_NAME_MAX,
198 [_SC_TRACE] = -1,
199 [_SC_TRACE_EVENT_FILTER] = -1,
200 [_SC_TRACE_INHERIT] = -1,
201 [_SC_TRACE_LOG] = -1,
202
203 [_SC_IPV6] = VER,
204 [_SC_RAW_SOCKETS] = VER,
205 [_SC_V7_ILP32_OFF32] = -1,
206 [_SC_V7_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : -1,
207 [_SC_V7_LP64_OFF64] = sizeof(long)==8 ? 1 : -1,
208 [_SC_V7_LPBIG_OFFBIG] = -1,
209 [_SC_SS_REPL_MAX] = -1,
210 [_SC_TRACE_EVENT_NAME_MAX] = -1,
211 [_SC_TRACE_NAME_MAX] = -1,
212 [_SC_TRACE_SYS_MAX] = -1,
213 [_SC_TRACE_USER_EVENT_MAX] = -1,
214 [_SC_XOPEN_STREAMS] = JT_ZERO,
215 [_SC_THREAD_ROBUST_PRIO_INHERIT] = -1,
216 [_SC_THREAD_ROBUST_PRIO_PROTECT] = -1,
217
218 [_SC_MINSIGSTKSZ] = JT_MINSIGSTKSZ,
219 [_SC_SIGSTKSZ] = JT_SIGSTKSZ,
220 };
221
222 if (name >= sizeof(values)/sizeof(values[0]) || !values[name]) {
223 errno = EINVAL;
224 return -1;
225 } else if (values[name] >= -1) {
226 return values[name];
227 } else if (values[name] < -256) {
228#ifdef __wasilibc_unmodified_upstream // WASI has no getrlimit
229 struct rlimit lim;
230 getrlimit(values[name]&16383, &lim);
231 if (lim.rlim_cur == RLIM_INFINITY)
232 return -1;
233 return lim.rlim_cur > LONG_MAX ? LONG_MAX : lim.rlim_cur;
234#else
235 // Not supported on wasi.
236 errno = EINVAL;
237 return -1;
238#endif
239 }
240
241 switch ((unsigned char)values[name]) {
242 case VER & 255:
243 return _POSIX_VERSION;
244 case JT_ARG_MAX & 255:
245 return ARG_MAX;
246#ifdef __wasilibc_unmodified_upstream // WASI has no mq
247 case JT_MQ_PRIO_MAX & 255:
248 return MQ_PRIO_MAX;
249#endif
250 case JT_PAGE_SIZE & 255:
251 return PAGE_SIZE;
252#ifdef __wasilibc_unmodified_upstream // WASI has no semaphores
253 case JT_SEM_VALUE_MAX & 255:
254 return SEM_VALUE_MAX;
255#endif
256 case JT_DELAYTIMER_MAX & 255:
257 return DELAYTIMER_MAX;
258 case JT_NPROCESSORS_CONF & 255:
259 case JT_NPROCESSORS_ONLN & 255: ;
260#ifdef __wasilibc_unmodified_upstream
261 unsigned char set[128] = {1};
262 int i, cnt;
263 __syscall(SYS_sched_getaffinity, 0, sizeof set, set);
264 for (i=cnt=0; i<sizeof set; i++)
265 for (; set[i]; set[i]&=set[i]-1, cnt++);
266 return cnt;
267#else
268 // WASI has no way to query the processor count
269 return 1;
270#endif
271#ifdef __wasilibc_unmodified_upstream // WASI has no sysinfo
272 case JT_PHYS_PAGES & 255:
273 case JT_AVPHYS_PAGES & 255: ;
274 unsigned long long mem;
275 struct sysinfo si;
276 __lsysinfo(&si);
277 if (!si.mem_unit) si.mem_unit = 1;
278 if (name==_SC_PHYS_PAGES) mem = si.totalram;
279 else mem = si.freeram + si.bufferram;
280 mem *= si.mem_unit;
281 mem /= PAGE_SIZE;
282 return (mem > LONG_MAX) ? LONG_MAX : mem;
283#endif
284 case JT_ZERO & 255:
285 return 0;
286 }
287#ifdef __wasilibc_unmodified_upstream // WASI has no auxv
288 case JT_MINSIGSTKSZ & 255:
289 case JT_SIGSTKSZ & 255: ;
290 long val = __getauxval(AT_MINSIGSTKSZ);
291 if (val < MINSIGSTKSZ) val = MINSIGSTKSZ;
292 if (values[name] == JT_SIGSTKSZ)
293 val += SIGSTKSZ - MINSIGSTKSZ;
294 return val;
295#endif
296 return values[name];
297}