1#include <unistd.h> 2#include <limits.h> 3#include <errno.h> 4#include <sys/resource.h> 5#include <signal.h> 6#include <sys/sysinfo.h> 7#include "syscall.h" 8#include "libc.h" 9 10#define JT(x) (-256|(x)) 11#define VER JT(1) 12#define JT_ARG_MAX JT(2) 13#define JT_MQ_PRIO_MAX JT(3) 14#define JT_PAGE_SIZE JT(4) 15#define JT_SEM_VALUE_MAX JT(5) 16#define JT_NPROCESSORS_CONF JT(6) 17#define JT_NPROCESSORS_ONLN JT(7) 18#define JT_PHYS_PAGES JT(8) 19#define JT_AVPHYS_PAGES JT(9) 20#define JT_ZERO JT(10) 21 22#define RLIM(x) (-32768|(RLIMIT_ ## x)) 23 24long sysconf(int name) 25{ 26 static const short values[] = { 27 [_SC_ARG_MAX] = JT_ARG_MAX, 28 [_SC_CHILD_MAX] = RLIM(NPROC), 29 [_SC_CLK_TCK] = 100, 30 [_SC_NGROUPS_MAX] = 32, 31 [_SC_OPEN_MAX] = RLIM(NOFILE), 32 [_SC_STREAM_MAX] = -1, 33 [_SC_TZNAME_MAX] = TZNAME_MAX, 34 [_SC_JOB_CONTROL] = 1, 35 [_SC_SAVED_IDS] = 1, 36 [_SC_REALTIME_SIGNALS] = 1, 37 [_SC_PRIORITY_SCHEDULING] = -1, 38 [_SC_TIMERS] = VER, 39 [_SC_ASYNCHRONOUS_IO] = VER, 40 [_SC_PRIORITIZED_IO] = -1, 41 [_SC_SYNCHRONIZED_IO] = -1, 42 [_SC_FSYNC] = VER, 43 [_SC_MAPPED_FILES] = VER, 44 [_SC_MEMLOCK] = VER, 45 [_SC_MEMLOCK_RANGE] = VER, 46 [_SC_MEMORY_PROTECTION] = VER, 47 [_SC_MESSAGE_PASSING] = VER, 48 [_SC_SEMAPHORES] = VER, 49 [_SC_SHARED_MEMORY_OBJECTS] = VER, 50 [_SC_AIO_LISTIO_MAX] = -1, 51 [_SC_AIO_MAX] = -1, 52 [_SC_AIO_PRIO_DELTA_MAX] = JT_ZERO, /* ?? */ 53 [_SC_DELAYTIMER_MAX] = _POSIX_DELAYTIMER_MAX, 54 [_SC_MQ_OPEN_MAX] = -1, 55 [_SC_MQ_PRIO_MAX] = JT_MQ_PRIO_MAX, 56 [_SC_VERSION] = VER, 57 [_SC_PAGE_SIZE] = JT_PAGE_SIZE, 58 [_SC_RTSIG_MAX] = _NSIG - 1 - 31 - 3, 59 [_SC_SEM_NSEMS_MAX] = SEM_NSEMS_MAX, 60 [_SC_SEM_VALUE_MAX] = JT_SEM_VALUE_MAX, 61 [_SC_SIGQUEUE_MAX] = -1, 62 [_SC_TIMER_MAX] = -1, 63 [_SC_BC_BASE_MAX] = _POSIX2_BC_BASE_MAX, 64 [_SC_BC_DIM_MAX] = _POSIX2_BC_DIM_MAX, 65 [_SC_BC_SCALE_MAX] = _POSIX2_BC_SCALE_MAX, 66 [_SC_BC_STRING_MAX] = _POSIX2_BC_STRING_MAX, 67 [_SC_COLL_WEIGHTS_MAX] = COLL_WEIGHTS_MAX, 68 [_SC_EXPR_NEST_MAX] = -1, 69 [_SC_LINE_MAX] = -1, 70 [_SC_RE_DUP_MAX] = RE_DUP_MAX, 71 [_SC_2_VERSION] = VER, 72 [_SC_2_C_BIND] = VER, 73 [_SC_2_C_DEV] = -1, 74 [_SC_2_FORT_DEV] = -1, 75 [_SC_2_FORT_RUN] = -1, 76 [_SC_2_SW_DEV] = -1, 77 [_SC_2_LOCALEDEF] = -1, 78 [_SC_IOV_MAX] = IOV_MAX, 79 [_SC_THREADS] = VER, 80 [_SC_THREAD_SAFE_FUNCTIONS] = VER, 81 [_SC_GETGR_R_SIZE_MAX] = -1, 82 [_SC_GETPW_R_SIZE_MAX] = -1, 83 [_SC_LOGIN_NAME_MAX] = 256, 84 [_SC_TTY_NAME_MAX] = TTY_NAME_MAX, 85 [_SC_THREAD_DESTRUCTOR_ITERATIONS] = PTHREAD_DESTRUCTOR_ITERATIONS, 86 [_SC_THREAD_KEYS_MAX] = PTHREAD_KEYS_MAX, 87 [_SC_THREAD_STACK_MIN] = PTHREAD_STACK_MIN, 88 [_SC_THREAD_THREADS_MAX] = -1, 89 [_SC_THREAD_ATTR_STACKADDR] = VER, 90 [_SC_THREAD_ATTR_STACKSIZE] = VER, 91 [_SC_THREAD_PRIORITY_SCHEDULING] = VER, 92 [_SC_THREAD_PRIO_INHERIT] = -1, 93 [_SC_THREAD_PRIO_PROTECT] = -1, 94 [_SC_THREAD_PROCESS_SHARED] = VER, 95 [_SC_NPROCESSORS_CONF] = JT_NPROCESSORS_CONF, 96 [_SC_NPROCESSORS_ONLN] = JT_NPROCESSORS_ONLN, 97 [_SC_PHYS_PAGES] = JT_PHYS_PAGES, 98 [_SC_AVPHYS_PAGES] = JT_AVPHYS_PAGES, 99 [_SC_ATEXIT_MAX] = -1, 100 [_SC_PASS_MAX] = -1, 101 [_SC_XOPEN_VERSION] = _XOPEN_VERSION, 102 [_SC_XOPEN_XCU_VERSION] = _XOPEN_VERSION, 103 [_SC_XOPEN_UNIX] = 1, 104 [_SC_XOPEN_CRYPT] = -1, 105 [_SC_XOPEN_ENH_I18N] = 1, 106 [_SC_XOPEN_SHM] = 1, 107 [_SC_2_CHAR_TERM] = -1, 108 [_SC_2_UPE] = -1, 109 [_SC_XOPEN_XPG2] = -1, 110 [_SC_XOPEN_XPG3] = -1, 111 [_SC_XOPEN_XPG4] = -1, 112 [_SC_NZERO] = NZERO, 113 [_SC_XBS5_ILP32_OFF32] = -1, 114 [_SC_XBS5_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : JT_ZERO, 115 [_SC_XBS5_LP64_OFF64] = sizeof(long)==8 ? 1 : JT_ZERO, 116 [_SC_XBS5_LPBIG_OFFBIG] = -1, 117 [_SC_XOPEN_LEGACY] = -1, 118 [_SC_XOPEN_REALTIME] = -1, 119 [_SC_XOPEN_REALTIME_THREADS] = -1, 120 [_SC_ADVISORY_INFO] = VER, 121 [_SC_BARRIERS] = VER, 122 [_SC_CLOCK_SELECTION] = VER, 123 [_SC_CPUTIME] = VER, 124 [_SC_THREAD_CPUTIME] = VER, 125 [_SC_MONOTONIC_CLOCK] = VER, 126 [_SC_READER_WRITER_LOCKS] = VER, 127 [_SC_SPIN_LOCKS] = VER, 128 [_SC_REGEXP] = 1, 129 [_SC_SHELL] = 1, 130 [_SC_SPAWN] = VER, 131 [_SC_SPORADIC_SERVER] = -1, 132 [_SC_THREAD_SPORADIC_SERVER] = -1, 133 [_SC_TIMEOUTS] = VER, 134 [_SC_TYPED_MEMORY_OBJECTS] = -1, 135 [_SC_2_PBS] = -1, 136 [_SC_2_PBS_ACCOUNTING] = -1, 137 [_SC_2_PBS_LOCATE] = -1, 138 [_SC_2_PBS_MESSAGE] = -1, 139 [_SC_2_PBS_TRACK] = -1, 140 [_SC_SYMLOOP_MAX] = SYMLOOP_MAX, 141 [_SC_STREAMS] = JT_ZERO, 142 [_SC_2_PBS_CHECKPOINT] = -1, 143 [_SC_V6_ILP32_OFF32] = -1, 144 [_SC_V6_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : JT_ZERO, 145 [_SC_V6_LP64_OFF64] = sizeof(long)==8 ? 1 : JT_ZERO, 146 [_SC_V6_LPBIG_OFFBIG] = -1, 147 [_SC_HOST_NAME_MAX] = HOST_NAME_MAX, 148 [_SC_TRACE] = -1, 149 [_SC_TRACE_EVENT_FILTER] = -1, 150 [_SC_TRACE_INHERIT] = -1, 151 [_SC_TRACE_LOG] = -1, 152 153 [_SC_IPV6] = VER, 154 [_SC_RAW_SOCKETS] = VER, 155 [_SC_V7_ILP32_OFF32] = -1, 156 [_SC_V7_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : JT_ZERO, 157 [_SC_V7_LP64_OFF64] = sizeof(long)==8 ? 1 : JT_ZERO, 158 [_SC_V7_LPBIG_OFFBIG] = -1, 159 [_SC_SS_REPL_MAX] = -1, 160 [_SC_TRACE_EVENT_NAME_MAX] = -1, 161 [_SC_TRACE_NAME_MAX] = -1, 162 [_SC_TRACE_SYS_MAX] = -1, 163 [_SC_TRACE_USER_EVENT_MAX] = -1, 164 [_SC_XOPEN_STREAMS] = JT_ZERO, 165 [_SC_THREAD_ROBUST_PRIO_INHERIT] = -1, 166 [_SC_THREAD_ROBUST_PRIO_PROTECT] = -1, 167 }; 168 169 if (name >= sizeof(values)/sizeof(values[0]) || !values[name]) { 170 errno = EINVAL; 171 return -1; 172 } else if (values[name] >= -1) { 173 return values[name]; 174 } else if (values[name] < -256) { 175 struct rlimit lim; 176 getrlimit(values[name]&16383, &lim); 177 return lim.rlim_cur > LONG_MAX ? LONG_MAX : lim.rlim_cur; 178 } 179 180 switch ((unsigned char)values[name]) { 181 case VER & 255: 182 return _POSIX_VERSION; 183 case JT_ARG_MAX & 255: 184 return ARG_MAX; 185 case JT_MQ_PRIO_MAX & 255: 186 return MQ_PRIO_MAX; 187 case JT_PAGE_SIZE & 255: 188 return PAGE_SIZE; 189 case JT_SEM_VALUE_MAX & 255: 190 return SEM_VALUE_MAX; 191 case JT_NPROCESSORS_CONF & 255: 192 case JT_NPROCESSORS_ONLN & 255: ; 193 unsigned char set[128] = {1}; 194 int i, cnt; 195 __syscall(SYS_sched_getaffinity, 0, sizeof set, set); 196 for (i=cnt=0; i<sizeof set; i++) 197 for (; set[i]; set[i]&=set[i]-1, cnt++); 198 return cnt; 199 case JT_PHYS_PAGES & 255: 200 case JT_AVPHYS_PAGES & 255: ; 201 unsigned long long mem; 202 int __lsysinfo(struct sysinfo *); 203 struct sysinfo si; 204 __lsysinfo(&si); 205 if (!si.mem_unit) si.mem_unit = 1; 206 if (name==_SC_PHYS_PAGES) mem = si.totalram; 207 else mem = si.freeram + si.bufferram; 208 mem *= si.mem_unit; 209 mem /= PAGE_SIZE; 210 return (mem > LONG_MAX) ? LONG_MAX : mem; 211 case JT_ZERO & 255: 212 return 0; 213 } 214 return values[name]; 215} 216