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sysconf.c
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sysconf.c
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#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <sys/resource.h>
#include <signal.h>
#include <sys/sysinfo.h>
#include "syscall.h"
#include "libc.h"
#define JT(x) (-256|(x))
#define VER JT(1)
#define JT_ARG_MAX JT(2)
#define JT_MQ_PRIO_MAX JT(3)
#define JT_PAGE_SIZE JT(4)
#define JT_SEM_VALUE_MAX JT(5)
#define JT_NPROCESSORS_CONF JT(6)
#define JT_NPROCESSORS_ONLN JT(7)
#define JT_PHYS_PAGES JT(8)
#define JT_AVPHYS_PAGES JT(9)
#define JT_ZERO JT(10)
#define JT_DELAYTIMER_MAX JT(11)
#define RLIM(x) (-32768|(RLIMIT_ ## x))
static long sysconf_nproc_conf;
static long sysconf_nproc_onln;
void init_sysconf(long nproc_conf, long nproc_onln) {
sysconf_nproc_conf = nproc_conf;
sysconf_nproc_onln = nproc_conf;
}
long sysconf(int name)
{
static const short values[] = {
[_SC_ARG_MAX] = JT_ARG_MAX,
[_SC_CHILD_MAX] = RLIM(NPROC),
[_SC_CLK_TCK] = 100,
[_SC_NGROUPS_MAX] = 32,
[_SC_OPEN_MAX] = RLIM(NOFILE),
[_SC_STREAM_MAX] = -1,
[_SC_TZNAME_MAX] = TZNAME_MAX,
[_SC_JOB_CONTROL] = 1,
[_SC_SAVED_IDS] = 1,
[_SC_REALTIME_SIGNALS] = VER,
[_SC_PRIORITY_SCHEDULING] = -1,
[_SC_TIMERS] = VER,
[_SC_ASYNCHRONOUS_IO] = VER,
[_SC_PRIORITIZED_IO] = -1,
[_SC_SYNCHRONIZED_IO] = -1,
[_SC_FSYNC] = VER,
[_SC_MAPPED_FILES] = VER,
[_SC_MEMLOCK] = VER,
[_SC_MEMLOCK_RANGE] = VER,
[_SC_MEMORY_PROTECTION] = VER,
[_SC_MESSAGE_PASSING] = VER,
[_SC_SEMAPHORES] = VER,
[_SC_SHARED_MEMORY_OBJECTS] = VER,
[_SC_AIO_LISTIO_MAX] = -1,
[_SC_AIO_MAX] = -1,
[_SC_AIO_PRIO_DELTA_MAX] = JT_ZERO, /* ?? */
[_SC_DELAYTIMER_MAX] = JT_DELAYTIMER_MAX,
[_SC_MQ_OPEN_MAX] = -1,
[_SC_MQ_PRIO_MAX] = JT_MQ_PRIO_MAX,
[_SC_VERSION] = VER,
[_SC_PAGE_SIZE] = JT_PAGE_SIZE,
[_SC_RTSIG_MAX] = _NSIG - 1 - 31 - 3,
[_SC_SEM_NSEMS_MAX] = SEM_NSEMS_MAX,
[_SC_SEM_VALUE_MAX] = JT_SEM_VALUE_MAX,
[_SC_SIGQUEUE_MAX] = -1,
[_SC_TIMER_MAX] = -1,
[_SC_BC_BASE_MAX] = _POSIX2_BC_BASE_MAX,
[_SC_BC_DIM_MAX] = _POSIX2_BC_DIM_MAX,
[_SC_BC_SCALE_MAX] = _POSIX2_BC_SCALE_MAX,
[_SC_BC_STRING_MAX] = _POSIX2_BC_STRING_MAX,
[_SC_COLL_WEIGHTS_MAX] = COLL_WEIGHTS_MAX,
[_SC_EXPR_NEST_MAX] = -1,
[_SC_LINE_MAX] = -1,
[_SC_RE_DUP_MAX] = RE_DUP_MAX,
[_SC_2_VERSION] = VER,
[_SC_2_C_BIND] = VER,
[_SC_2_C_DEV] = -1,
[_SC_2_FORT_DEV] = -1,
[_SC_2_FORT_RUN] = -1,
[_SC_2_SW_DEV] = -1,
[_SC_2_LOCALEDEF] = -1,
[_SC_IOV_MAX] = IOV_MAX,
[_SC_THREADS] = VER,
[_SC_THREAD_SAFE_FUNCTIONS] = VER,
[_SC_GETGR_R_SIZE_MAX] = -1,
[_SC_GETPW_R_SIZE_MAX] = -1,
[_SC_LOGIN_NAME_MAX] = 256,
[_SC_TTY_NAME_MAX] = TTY_NAME_MAX,
[_SC_THREAD_DESTRUCTOR_ITERATIONS] = PTHREAD_DESTRUCTOR_ITERATIONS,
[_SC_THREAD_KEYS_MAX] = PTHREAD_KEYS_MAX,
[_SC_THREAD_STACK_MIN] = PTHREAD_STACK_MIN,
[_SC_THREAD_THREADS_MAX] = -1,
[_SC_THREAD_ATTR_STACKADDR] = VER,
[_SC_THREAD_ATTR_STACKSIZE] = VER,
[_SC_THREAD_PRIORITY_SCHEDULING] = VER,
[_SC_THREAD_PRIO_INHERIT] = -1,
[_SC_THREAD_PRIO_PROTECT] = -1,
[_SC_THREAD_PROCESS_SHARED] = VER,
[_SC_NPROCESSORS_CONF] = JT_NPROCESSORS_CONF,
[_SC_NPROCESSORS_ONLN] = JT_NPROCESSORS_ONLN,
[_SC_PHYS_PAGES] = JT_PHYS_PAGES,
[_SC_AVPHYS_PAGES] = JT_AVPHYS_PAGES,
[_SC_ATEXIT_MAX] = -1,
[_SC_PASS_MAX] = -1,
[_SC_XOPEN_VERSION] = _XOPEN_VERSION,
[_SC_XOPEN_XCU_VERSION] = _XOPEN_VERSION,
[_SC_XOPEN_UNIX] = 1,
[_SC_XOPEN_CRYPT] = -1,
[_SC_XOPEN_ENH_I18N] = 1,
[_SC_XOPEN_SHM] = 1,
[_SC_2_CHAR_TERM] = -1,
[_SC_2_UPE] = -1,
[_SC_XOPEN_XPG2] = -1,
[_SC_XOPEN_XPG3] = -1,
[_SC_XOPEN_XPG4] = -1,
[_SC_NZERO] = NZERO,
[_SC_XBS5_ILP32_OFF32] = -1,
[_SC_XBS5_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : -1,
[_SC_XBS5_LP64_OFF64] = sizeof(long)==8 ? 1 : -1,
[_SC_XBS5_LPBIG_OFFBIG] = -1,
[_SC_XOPEN_LEGACY] = -1,
[_SC_XOPEN_REALTIME] = -1,
[_SC_XOPEN_REALTIME_THREADS] = -1,
[_SC_ADVISORY_INFO] = VER,
[_SC_BARRIERS] = VER,
[_SC_CLOCK_SELECTION] = VER,
[_SC_CPUTIME] = VER,
[_SC_THREAD_CPUTIME] = VER,
[_SC_MONOTONIC_CLOCK] = VER,
[_SC_READER_WRITER_LOCKS] = VER,
[_SC_SPIN_LOCKS] = VER,
[_SC_REGEXP] = 1,
[_SC_SHELL] = 1,
[_SC_SPAWN] = VER,
[_SC_SPORADIC_SERVER] = -1,
[_SC_THREAD_SPORADIC_SERVER] = -1,
[_SC_TIMEOUTS] = VER,
[_SC_TYPED_MEMORY_OBJECTS] = -1,
[_SC_2_PBS] = -1,
[_SC_2_PBS_ACCOUNTING] = -1,
[_SC_2_PBS_LOCATE] = -1,
[_SC_2_PBS_MESSAGE] = -1,
[_SC_2_PBS_TRACK] = -1,
[_SC_SYMLOOP_MAX] = SYMLOOP_MAX,
[_SC_STREAMS] = JT_ZERO,
[_SC_2_PBS_CHECKPOINT] = -1,
[_SC_V6_ILP32_OFF32] = -1,
[_SC_V6_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : -1,
[_SC_V6_LP64_OFF64] = sizeof(long)==8 ? 1 : -1,
[_SC_V6_LPBIG_OFFBIG] = -1,
[_SC_HOST_NAME_MAX] = HOST_NAME_MAX,
[_SC_TRACE] = -1,
[_SC_TRACE_EVENT_FILTER] = -1,
[_SC_TRACE_INHERIT] = -1,
[_SC_TRACE_LOG] = -1,
[_SC_IPV6] = VER,
[_SC_RAW_SOCKETS] = VER,
[_SC_V7_ILP32_OFF32] = -1,
[_SC_V7_ILP32_OFFBIG] = sizeof(long)==4 ? 1 : -1,
[_SC_V7_LP64_OFF64] = sizeof(long)==8 ? 1 : -1,
[_SC_V7_LPBIG_OFFBIG] = -1,
[_SC_SS_REPL_MAX] = -1,
[_SC_TRACE_EVENT_NAME_MAX] = -1,
[_SC_TRACE_NAME_MAX] = -1,
[_SC_TRACE_SYS_MAX] = -1,
[_SC_TRACE_USER_EVENT_MAX] = -1,
[_SC_XOPEN_STREAMS] = JT_ZERO,
[_SC_THREAD_ROBUST_PRIO_INHERIT] = -1,
[_SC_THREAD_ROBUST_PRIO_PROTECT] = -1,
};
if (name >= sizeof(values)/sizeof(values[0]) || !values[name]) {
errno = EINVAL;
return -1;
} else if (values[name] >= -1) {
return values[name];
} else if (values[name] < -256) {
struct rlimit lim;
getrlimit(values[name]&16383, &lim);
if (lim.rlim_cur == RLIM_INFINITY)
return -1;
return lim.rlim_cur > LONG_MAX ? LONG_MAX : lim.rlim_cur;
}
switch ((unsigned char)values[name]) {
case VER & 255:
return _POSIX_VERSION;
case JT_ARG_MAX & 255:
return ARG_MAX;
case JT_MQ_PRIO_MAX & 255:
return MQ_PRIO_MAX;
case JT_PAGE_SIZE & 255:
return PAGE_SIZE;
case JT_SEM_VALUE_MAX & 255:
return SEM_VALUE_MAX;
case JT_DELAYTIMER_MAX & 255:
return DELAYTIMER_MAX;
case JT_NPROCESSORS_CONF & 255:
return sysconf_nproc_conf;
case JT_NPROCESSORS_ONLN & 255:
return sysconf_nproc_onln;
case JT_PHYS_PAGES & 255:
case JT_AVPHYS_PAGES & 255: ;
unsigned long long mem;
struct sysinfo si;
__lsysinfo(&si);
if (!si.mem_unit) si.mem_unit = 1;
if (name==_SC_PHYS_PAGES) mem = si.totalram;
else mem = si.freeram + si.bufferram;
mem *= si.mem_unit;
mem /= PAGE_SIZE;
return (mem > LONG_MAX) ? LONG_MAX : mem;
case JT_ZERO & 255:
return 0;
}
return values[name];
}