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