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