270 lines
9.5 KiB
C++
270 lines
9.5 KiB
C++
/* sysconf.cc
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <unistd.h>
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#include <time.h>
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#include <limits.h>
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#include <ntdef.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "ntdll.h"
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static long
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get_open_max (int in)
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{
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long max = getdtablesize ();
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if (max < OPEN_MAX)
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max = OPEN_MAX;
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return max;
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}
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static long
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get_page_size (int in)
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{
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return getpagesize ();
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}
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static long
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get_nproc_values (int in)
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{
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switch (in)
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{
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case _SC_NPROCESSORS_CONF:
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case _SC_NPROCESSORS_ONLN:
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if (!wincap.supports_smp ())
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return 1;
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/*FALLTHRU*/
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case _SC_PHYS_PAGES:
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if (wincap.supports_smp ())
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{
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NTSTATUS ret;
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SYSTEM_BASIC_INFORMATION sbi;
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if ((ret = NtQuerySystemInformation (SystemBasicInformation,
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(PVOID) &sbi,
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sizeof sbi, NULL))
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!= STATUS_SUCCESS)
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{
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__seterrno_from_nt_status (ret);
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debug_printf ("NtQuerySystemInformation: ret %d, Dos(ret) %E",
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ret);
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return -1;
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}
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switch (in)
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{
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case _SC_NPROCESSORS_CONF:
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return sbi.NumberProcessors;
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case _SC_NPROCESSORS_ONLN:
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{
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int i = 0;
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do
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if (sbi.ActiveProcessors & 1)
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i++;
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while (sbi.ActiveProcessors >>= 1);
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return i;
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}
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case _SC_PHYS_PAGES:
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return sbi.NumberOfPhysicalPages
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/ (getpagesize () / getsystempagesize ());
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}
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}
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}
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return -1;
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}
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static long
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get_avphys (int in)
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{
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if (wincap.supports_smp ())
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{
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NTSTATUS ret;
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SYSTEM_PERFORMANCE_INFORMATION spi;
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if ((ret = NtQuerySystemInformation (SystemPerformanceInformation,
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(PVOID) &spi,
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sizeof spi, NULL))
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!= STATUS_SUCCESS)
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{
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__seterrno_from_nt_status (ret);
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debug_printf ("NtQuerySystemInformation: ret %d, Dos(ret) %E",
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ret);
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return -1;
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}
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return spi.AvailablePages / (getpagesize () / getsystempagesize ());
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}
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return -1;
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}
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enum sc_type { nsup, cons, func };
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static struct
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{
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sc_type type;
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union
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{
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long c;
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long (*f)(int);
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};
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} sca[] =
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{
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{cons, {c:ARG_MAX}}, /* 0, _SC_ARG_MAX */
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{cons, {c:CHILD_MAX}}, /* 1, _SC_CHILD_MAX */
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{cons, {c:CLOCKS_PER_SEC}}, /* 2, _SC_CLK_TCK */
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{cons, {c:NGROUPS_MAX}}, /* 3, _SC_NGROUPS_MAX */
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{func, {f:get_open_max}}, /* 4, _SC_OPEN_MAX */
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{cons, {c:_POSIX_JOB_CONTROL}}, /* 5, _SC_JOB_CONTROL */
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{cons, {c:_POSIX_SAVED_IDS}}, /* 6, _SC_SAVED_IDS */
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{cons, {c:_POSIX_VERSION}}, /* 7, _SC_VERSION */
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{func, {f:get_page_size}}, /* 8, _SC_PAGESIZE */
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{func, {f:get_nproc_values}}, /* 9, _SC_NPROCESSORS_CONF */
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{func, {f:get_nproc_values}}, /* 10, _SC_NPROCESSORS_ONLN */
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{func, {f:get_nproc_values}}, /* 11, _SC_PHYS_PAGES */
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{func, {f:get_avphys}}, /* 12, _SC_AVPHYS_PAGES */
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{cons, {c:MQ_OPEN_MAX}}, /* 13, _SC_MQ_OPEN_MAX */
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{cons, {c:MQ_PRIO_MAX}}, /* 14, _SC_MQ_PRIO_MAX */
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{cons, {c:RTSIG_MAX}}, /* 15, _SC_RTSIG_MAX */
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{cons, {c:-1L}}, /* 16, _SC_SEM_NSEMS_MAX */
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{cons, {c:SEM_VALUE_MAX}}, /* 17, _SC_SEM_VALUE_MAX */
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{cons, {c:SIGQUEUE_MAX}}, /* 18, _SC_SIGQUEUE_MAX */
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{cons, {c:TIMER_MAX}}, /* 19, _SC_TIMER_MAX */
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{nsup, {c:0}}, /* 20, _SC_TZNAME_MAX */
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{cons, {c:-1L}}, /* 21, _SC_ASYNCHRONOUS_IO */
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{cons, {c:_POSIX_FSYNC}}, /* 22, _SC_FSYNC */
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{cons, {c:_POSIX_MAPPED_FILES}}, /* 23, _SC_MAPPED_FILES */
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{cons, {c:-1L}}, /* 24, _SC_MEMLOCK */
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{cons, {c:_POSIX_MEMLOCK_RANGE}}, /* 25, _SC_MEMLOCK_RANGE */
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{cons, {c:_POSIX_MEMORY_PROTECTION}}, /* 26, _SC_MEMORY_PROTECTION */
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{cons, {c:_POSIX_MESSAGE_PASSING}}, /* 27, _SC_MESSAGE_PASSING */
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{cons, {c:-1L}}, /* 28, _SC_PRIORITIZED_IO */
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{cons, {c:_POSIX_REALTIME_SIGNALS}}, /* 29, _SC_REALTIME_SIGNALS */
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{cons, {c:_POSIX_SEMAPHORES}}, /* 30, _SC_SEMAPHORES */
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{cons, {c:_POSIX_SHARED_MEMORY_OBJECTS}}, /* 31, _SC_SHARED_MEMORY_OBJECTS */
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{cons, {c:_POSIX_SYNCHRONIZED_IO}}, /* 32, _SC_SYNCHRONIZED_IO */
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{cons, {c:_POSIX_TIMERS}}, /* 33, _SC_TIMERS */
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{nsup, {c:0}}, /* 34, _SC_AIO_LISTIO_MAX */
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{nsup, {c:0}}, /* 35, _SC_AIO_MAX */
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{nsup, {c:0}}, /* 36, _SC_AIO_PRIO_DELTA_MAX */
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{nsup, {c:0}}, /* 37, _SC_DELAYTIMER_MAX */
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{cons, {c:PTHREAD_KEYS_MAX}}, /* 38, _SC_THREAD_KEYS_MAX */
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{cons, {c:PTHREAD_STACK_MIN}}, /* 39, _SC_THREAD_STACK_MIN */
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{cons, {c:-1L}}, /* 40, _SC_THREAD_THREADS_MAX */
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{cons, {c:TTY_NAME_MAX}}, /* 41, _SC_TTY_NAME_MAX */
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{cons, {c:_POSIX_THREADS}}, /* 42, _SC_THREADS */
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{cons, {c:-1L}}, /* 43, _SC_THREAD_ATTR_STACKADDR */
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{cons, {c:_POSIX_THREAD_ATTR_STACKSIZE}}, /* 44, _SC_THREAD_ATTR_STACKSIZE */
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{cons, {c:_POSIX_THREAD_PRIORITY_SCHEDULING}}, /* 45, _SC_THREAD_PRIORITY_SCHEDULING */
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{cons, {c:-1L}}, /* 46, _SC_THREAD_PRIO_INHERIT */
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{cons, {c:-1L}}, /* 47, _SC_THREAD_PRIO_PROTECT */
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{cons, {c:_POSIX_THREAD_PROCESS_SHARED}}, /* 48, _SC_THREAD_PROCESS_SHARED */
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{cons, {c:_POSIX_THREAD_SAFE_FUNCTIONS}}, /* 49, _SC_THREAD_SAFE_FUNCTIONS */
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{cons, {c:16384L}}, /* 50, _SC_GETGR_R_SIZE_MAX */
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{cons, {c:16384L}}, /* 51, _SC_GETPW_R_SIZE_MAX */
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{cons, {c:LOGIN_NAME_MAX}}, /* 52, _SC_LOGIN_NAME_MAX */
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{cons, {c:PTHREAD_DESTRUCTOR_ITERATIONS}}, /* 53, _SC_THREAD_DESTRUCTOR_ITERATIONS */
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{cons, {c:_POSIX_ADVISORY_INFO}}, /* 54, _SC_ADVISORY_INFO */
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{cons, {c:ATEXIT_MAX}}, /* 55, _SC_ATEXIT_MAX */
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{cons, {c:-1L}}, /* 56, _SC_BARRIERS */
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{cons, {c:BC_BASE_MAX}}, /* 57, _SC_BC_BASE_MAX */
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{cons, {c:BC_DIM_MAX}}, /* 58, _SC_BC_DIM_MAX */
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{cons, {c:BC_SCALE_MAX}}, /* 59, _SC_BC_SCALE_MAX */
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{cons, {c:BC_STRING_MAX}}, /* 60, _SC_BC_STRING_MAX */
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{cons, {c:-1L}}, /* 61, _SC_CLOCK_SELECTION */
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{nsup, {c:0}}, /* 62, _SC_COLL_WEIGHTS_MAX */
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{cons, {c:-1L}}, /* 63, _SC_CPUTIME */
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{cons, {c:EXPR_NEST_MAX}}, /* 64, _SC_EXPR_NEST_MAX */
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{cons, {c:HOST_NAME_MAX}}, /* 65, _SC_HOST_NAME_MAX */
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{cons, {c:IOV_MAX}}, /* 66, _SC_IOV_MAX */
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{cons, {c:_POSIX_IPV6}}, /* 67, _SC_IPV6 */
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{cons, {c:LINE_MAX}}, /* 68, _SC_LINE_MAX */
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{cons, {c:-1L}}, /* 69, _SC_MONOTONIC_CLOCK */
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{cons, {c:_POSIX_RAW_SOCKETS}}, /* 70, _SC_RAW_SOCKETS */
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{cons, {c:_POSIX_READER_WRITER_LOCKS}}, /* 71, _SC_READER_WRITER_LOCKS */
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{cons, {c:_POSIX_REGEXP}}, /* 72, _SC_REGEXP */
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{cons, {c:RE_DUP_MAX}}, /* 73, _SC_RE_DUP_MAX */
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{cons, {c:_POSIX_SHELL}}, /* 74, _SC_SHELL */
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{cons, {c:-1L}}, /* 75, _SC_SPAWN */
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{cons, {c:-1L}}, /* 76, _SC_SPIN_LOCKS */
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{cons, {c:-1L}}, /* 77, _SC_SPORADIC_SERVER */
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{nsup, {c:0}}, /* 78, _SC_SS_REPL_MAX */
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{cons, {c:SYMLOOP_MAX}}, /* 79, _SC_SYMLOOP_MAX */
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{cons, {c:-1L}}, /* 80, _SC_THREAD_CPUTIME */
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{cons, {c:-1L}}, /* 81, _SC_THREAD_SPORADIC_SERVER */
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{cons, {c:-1L}}, /* 82, _SC_TIMEOUTS */
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{cons, {c:-1L}}, /* 83, _SC_TRACE */
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{cons, {c:-1L}}, /* 84, _SC_TRACE_EVENT_FILTER */
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{nsup, {c:0}}, /* 85, _SC_TRACE_EVENT_NAME_MAX */
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{cons, {c:-1L}}, /* 86, _SC_TRACE_INHERIT */
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{cons, {c:-1L}}, /* 87, _SC_TRACE_LOG */
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{nsup, {c:0}}, /* 88, _SC_TRACE_NAME_MAX */
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{nsup, {c:0}}, /* 89, _SC_TRACE_SYS_MAX */
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{nsup, {c:0}}, /* 90, _SC_TRACE_USER_EVENT_MAX */
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{cons, {c:-1L}}, /* 91, _SC_TYPED_MEMORY_OBJECTS */
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{cons, {c:-1L}}, /* 92, _SC_V6_ILP32_OFF32 */
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{cons, {c:_POSIX_V6_ILP32_OFFBIG}}, /* 93, _SC_V6_ILP32_OFFBIG */
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{cons, {c:-1L}}, /* 94, _SC_V6_LP64_OFF64 */
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{cons, {c:-1L}}, /* 95, _SC_V6_LPBIG_OFFBIG */
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{cons, {c:_XOPEN_CRYPT}}, /* 96, _SC_XOPEN_CRYPT */
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{cons, {c:_XOPEN_ENH_I18N}}, /* 97, _SC_XOPEN_ENH_I18N */
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{cons, {c:-1L}}, /* 98, _SC_XOPEN_LEGACY */
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{cons, {c:-1L}}, /* 99, _SC_XOPEN_REALTIME */
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{cons, {c:STREAM_MAX}}, /* 100, _SC_STREAM_MAX */
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{cons, {c:_POSIX_PRIORITY_SCHEDULING}}, /* 101, _SC_PRIORITY_SCHEDULING */
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{cons, {c:-1L}}, /* 102, _SC_XOPEN_REALTIME_THREADS */
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{cons, {c:_XOPEN_SHM}}, /* 103, _SC_XOPEN_SHM */
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{cons, {c:-1L}}, /* 104, _SC_XOPEN_STREAMS */
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{cons, {c:-1L}}, /* 105, _SC_XOPEN_UNIX */
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{cons, {c:_XOPEN_VERSION}}, /* 106, _SC_XOPEN_VERSION */
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{cons, {c:_POSIX2_CHAR_TERM}}, /* 107, _SC_2_CHAR_TERM */
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{cons, {c:_POSIX2_C_BIND}}, /* 108, _SC_2_C_BIND */
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{cons, {c:_POSIX2_C_BIND}}, /* 109, _SC_2_C_DEV */
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{cons, {c:-1L}}, /* 110, _SC_2_FORT_DEV */
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{cons, {c:-1L}}, /* 111, _SC_2_FORT_RUN */
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{cons, {c:-1L}}, /* 112, _SC_2_LOCALEDEF */
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{cons, {c:-1L}}, /* 113, _SC_2_PBS */
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{cons, {c:-1L}}, /* 114, _SC_2_PBS_ACCOUNTING */
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{cons, {c:-1L}}, /* 115, _SC_2_PBS_CHECKPOINT */
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{cons, {c:-1L}}, /* 116, _SC_2_PBS_LOCATE */
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{cons, {c:-1L}}, /* 117, _SC_2_PBS_MESSAGE */
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{cons, {c:-1L}}, /* 118, _SC_2_PBS_TRACK */
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{cons, {c:_POSIX2_SW_DEV}}, /* 119, _SC_2_SW_DEV */
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{cons, {c:_POSIX2_UPE}}, /* 120, _SC_2_UPE */
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{cons, {c:_POSIX2_VERSION}}, /* 121, _SC_2_VERSION */
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};
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#define SC_MIN _SC_ARG_MAX
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#define SC_MAX _SC_2_VERSION
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/* sysconf: POSIX 4.8.1.1 */
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/* Allows a portable app to determine quantities of resources or
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presence of an option at execution time. */
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long int
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sysconf (int in)
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{
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if (in >= SC_MIN && in <= SC_MAX)
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{
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switch (sca[in].type)
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{
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case nsup:
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break;
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case cons:
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return sca[in].c;
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case func:
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return sca[in].f (in);
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}
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}
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/* Unimplemented sysconf name or invalid option value. */
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set_errno (EINVAL);
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return -1L;
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}
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