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