#include #include #include int main() { int vals[] = { _SC_PAGE_SIZE, _SC_PAGESIZE, _SC_ADVISORY_INFO, _SC_BARRIERS, _SC_ASYNCHRONOUS_IO, _SC_CLOCK_SELECTION, _SC_CPUTIME, _SC_FSYNC, _SC_IPV6, _SC_MAPPED_FILES, _SC_MEMLOCK, _SC_MEMLOCK_RANGE, _SC_MEMORY_PROTECTION, _SC_MESSAGE_PASSING, _SC_MONOTONIC_CLOCK, _SC_PRIORITIZED_IO, _SC_PRIORITY_SCHEDULING, _SC_RAW_SOCKETS, _SC_READER_WRITER_LOCKS, _SC_REALTIME_SIGNALS, _SC_SEMAPHORES, _SC_SHARED_MEMORY_OBJECTS, _SC_SPAWN, _SC_SPIN_LOCKS, _SC_SYNCHRONIZED_IO, _SC_THREAD_ATTR_STACKADDR, _SC_THREAD_ATTR_STACKSIZE, _SC_THREAD_CPUTIME, _SC_THREAD_PRIO_INHERIT, _SC_THREAD_PRIO_PROTECT, _SC_THREAD_PRIORITY_SCHEDULING, _SC_THREAD_PROCESS_SHARED, _SC_THREAD_SAFE_FUNCTIONS, _SC_THREADS, _SC_TIMEOUTS, _SC_TIMERS, _SC_VERSION, _SC_2_C_BIND, _SC_2_C_DEV, _SC_2_CHAR_TERM, _SC_2_LOCALEDEF, _SC_2_SW_DEV, _SC_2_VERSION, _SC_MQ_OPEN_MAX, _SC_XOPEN_STREAMS, _SC_XBS5_LP64_OFF64, _SC_XBS5_LPBIG_OFFBIG, _SC_AIO_LISTIO_MAX, _SC_AIO_MAX, _SC_SPORADIC_SERVER, _SC_THREAD_SPORADIC_SERVER, _SC_TRACE, _SC_TRACE_EVENT_FILTER, _SC_TRACE_EVENT_NAME_MAX, _SC_TRACE_INHERIT, _SC_TRACE_LOG, _SC_TRACE_NAME_MAX, _SC_TRACE_SYS_MAX, _SC_TRACE_USER_EVENT_MAX, _SC_TYPED_MEMORY_OBJECTS, _SC_V6_LP64_OFF64, _SC_V6_LPBIG_OFFBIG, _SC_2_FORT_DEV, _SC_2_FORT_RUN, _SC_2_PBS, _SC_2_PBS_ACCOUNTING, _SC_2_PBS_CHECKPOINT, _SC_2_PBS_LOCATE, _SC_2_PBS_MESSAGE, _SC_2_PBS_TRACK, _SC_2_UPE, _SC_THREAD_THREADS_MAX, _SC_SEM_NSEMS_MAX, _SC_SYMLOOP_MAX, _SC_TIMER_MAX, _SC_V6_ILP32_OFF32, _SC_V6_ILP32_OFFBIG, _SC_JOB_CONTROL, _SC_REGEXP, _SC_SAVED_IDS, _SC_SHELL, _SC_XBS5_ILP32_OFF32, _SC_XBS5_ILP32_OFFBIG, _SC_XOPEN_CRYPT, _SC_XOPEN_ENH_I18N, _SC_XOPEN_LEGACY, _SC_XOPEN_REALTIME, _SC_XOPEN_REALTIME_THREADS, _SC_XOPEN_SHM, _SC_XOPEN_UNIX, _SC_THREAD_KEYS_MAX, _SC_IOV_MAX, _SC_GETGR_R_SIZE_MAX, _SC_GETPW_R_SIZE_MAX, _SC_OPEN_MAX, _SC_RTSIG_MAX, _SC_EXPR_NEST_MAX, _SC_TTY_NAME_MAX, _SC_ATEXIT_MAX, _SC_DELAYTIMER_MAX, _SC_SEM_VALUE_MAX, _SC_SIGQUEUE_MAX, _SC_CHILD_MAX, _SC_BC_SCALE_MAX, _SC_BC_BASE_MAX, _SC_LINE_MAX, _SC_BC_DIM_MAX, _SC_ARG_MAX, _SC_NGROUPS_MAX, _SC_MQ_PRIO_MAX, _SC_RE_DUP_MAX, _SC_THREAD_STACK_MIN, _SC_BC_STRING_MAX, _SC_XOPEN_VERSION, _SC_LOGIN_NAME_MAX, _SC_COLL_WEIGHTS_MAX, _SC_CLK_TCK, _SC_HOST_NAME_MAX, _SC_AIO_PRIO_DELTA_MAX, _SC_STREAM_MAX, _SC_TZNAME_MAX, _SC_THREAD_DESTRUCTOR_ITERATIONS }; char* names[] = { "_SC_PAGE_SIZE", "_SC_PAGESIZE", "_SC_ADVISORY_INFO", "_SC_BARRIERS", "_SC_ASYNCHRONOUS_IO", "_SC_CLOCK_SELECTION", "_SC_CPUTIME", "_SC_FSYNC", "_SC_IPV6", "_SC_MAPPED_FILES", "_SC_MEMLOCK", "_SC_MEMLOCK_RANGE", "_SC_MEMORY_PROTECTION", "_SC_MESSAGE_PASSING", "_SC_MONOTONIC_CLOCK", "_SC_PRIORITIZED_IO", "_SC_PRIORITY_SCHEDULING", "_SC_RAW_SOCKETS", "_SC_READER_WRITER_LOCKS", "_SC_REALTIME_SIGNALS", "_SC_SEMAPHORES", "_SC_SHARED_MEMORY_OBJECTS", "_SC_SPAWN", "_SC_SPIN_LOCKS", "_SC_SYNCHRONIZED_IO", "_SC_THREAD_ATTR_STACKADDR", "_SC_THREAD_ATTR_STACKSIZE", "_SC_THREAD_CPUTIME", "_SC_THREAD_PRIO_INHERIT", "_SC_THREAD_PRIO_PROTECT", "_SC_THREAD_PRIORITY_SCHEDULING", "_SC_THREAD_PROCESS_SHARED", "_SC_THREAD_SAFE_FUNCTIONS", "_SC_THREADS", "_SC_TIMEOUTS", "_SC_TIMERS", "_SC_VERSION", "_SC_2_C_BIND", "_SC_2_C_DEV", "_SC_2_CHAR_TERM", "_SC_2_LOCALEDEF", "_SC_2_SW_DEV", "_SC_2_VERSION", "_SC_MQ_OPEN_MAX", "_SC_XOPEN_STREAMS", "_SC_XBS5_LP64_OFF64", "_SC_XBS5_LPBIG_OFFBIG", "_SC_AIO_LISTIO_MAX", "_SC_AIO_MAX", "_SC_SPORADIC_SERVER", "_SC_THREAD_SPORADIC_SERVER", "_SC_TRACE", "_SC_TRACE_EVENT_FILTER", "_SC_TRACE_EVENT_NAME_MAX", "_SC_TRACE_INHERIT", "_SC_TRACE_LOG", "_SC_TRACE_NAME_MAX", "_SC_TRACE_SYS_MAX", "_SC_TRACE_USER_EVENT_MAX", "_SC_TYPED_MEMORY_OBJECTS", "_SC_V6_LP64_OFF64", "_SC_V6_LPBIG_OFFBIG", "_SC_2_FORT_DEV", "_SC_2_FORT_RUN", "_SC_2_PBS", "_SC_2_PBS_ACCOUNTING", "_SC_2_PBS_CHECKPOINT", "_SC_2_PBS_LOCATE", "_SC_2_PBS_MESSAGE", "_SC_2_PBS_TRACK", "_SC_2_UPE", "_SC_THREAD_THREADS_MAX", "_SC_SEM_NSEMS_MAX", "_SC_SYMLOOP_MAX", "_SC_TIMER_MAX", "_SC_V6_ILP32_OFF32", "_SC_V6_ILP32_OFFBIG", "_SC_JOB_CONTROL", "_SC_REGEXP", "_SC_SAVED_IDS", "_SC_SHELL", "_SC_XBS5_ILP32_OFF32", "_SC_XBS5_ILP32_OFFBIG", "_SC_XOPEN_CRYPT", "_SC_XOPEN_ENH_I18N", "_SC_XOPEN_LEGACY", "_SC_XOPEN_REALTIME", "_SC_XOPEN_REALTIME_THREADS", "_SC_XOPEN_SHM", "_SC_XOPEN_UNIX", "_SC_THREAD_KEYS_MAX", "_SC_IOV_MAX", "_SC_GETGR_R_SIZE_MAX", "_SC_GETPW_R_SIZE_MAX", "_SC_OPEN_MAX", "_SC_RTSIG_MAX", "_SC_EXPR_NEST_MAX", "_SC_TTY_NAME_MAX", "_SC_ATEXIT_MAX", "_SC_DELAYTIMER_MAX", "_SC_SEM_VALUE_MAX", "_SC_SIGQUEUE_MAX", "_SC_CHILD_MAX", "_SC_BC_SCALE_MAX", "_SC_BC_BASE_MAX", "_SC_LINE_MAX", "_SC_BC_DIM_MAX", "_SC_ARG_MAX", "_SC_NGROUPS_MAX", "_SC_MQ_PRIO_MAX", "_SC_RE_DUP_MAX", "_SC_THREAD_STACK_MIN", "_SC_BC_STRING_MAX", "_SC_XOPEN_VERSION", "_SC_LOGIN_NAME_MAX", "_SC_COLL_WEIGHTS_MAX", "_SC_CLK_TCK", "_SC_HOST_NAME_MAX", "_SC_AIO_PRIO_DELTA_MAX", "_SC_STREAM_MAX", "_SC_TZNAME_MAX", "_SC_THREAD_DESTRUCTOR_ITERATIONS" }; char buffer[256]; for (int i = 0; i < sizeof vals / sizeof vals[0]; i++) { printf("%s: %ld\n", names[i], sysconf(vals[i])); printf("errno: %d\n\n", errno); errno = 0; } printf("(invalid): %ld\n", sysconf(-123)); printf("errno: %d\n", errno); return 0; }