149 lines
3.5 KiB
C++
149 lines
3.5 KiB
C++
/* sysconf.cc
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006 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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/* 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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switch (in)
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{
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case _SC_ARG_MAX:
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/* FIXME: what's the right value? _POSIX_ARG_MAX is only 4K */
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return 1048576;
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case _SC_OPEN_MAX:
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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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case _SC_PAGESIZE:
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return getpagesize ();
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case _SC_CLK_TCK:
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return CLOCKS_PER_SEC;
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case _SC_JOB_CONTROL:
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return _POSIX_JOB_CONTROL;
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case _SC_CHILD_MAX:
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return CHILD_MAX;
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case _SC_NGROUPS_MAX:
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return NGROUPS_MAX;
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case _SC_SAVED_IDS:
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return _POSIX_SAVED_IDS;
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case _SC_LOGIN_NAME_MAX:
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return LOGIN_NAME_MAX;
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case _SC_GETPW_R_SIZE_MAX:
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case _SC_GETGR_R_SIZE_MAX:
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return 16*1024;
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case _SC_VERSION:
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return _POSIX_VERSION;
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#if 0 /* FIXME -- unimplemented */
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case _SC_TZNAME_MAX:
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return _POSIX_TZNAME_MAX;
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case _SC_STREAM_MAX:
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return _POSIX_STREAM_MAX;
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#endif
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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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}
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}
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break;
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case _SC_AVPHYS_PAGES:
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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;
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}
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case _SC_RTSIG_MAX:
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return RTSIG_MAX;
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case _SC_TTY_NAME_MAX:
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return TTY_NAME_MAX;
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case _SC_MEMLOCK_RANGE:
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return _POSIX_MEMLOCK_RANGE;
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case _SC_SEMAPHORES:
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return _POSIX_SEMAPHORES;
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case _SC_THREADS:
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return _POSIX_THREADS;
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case _SC_THREAD_ATTR_STACKSIZE:
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return _POSIX_THREAD_ATTR_STACKSIZE;
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case _SC_THREAD_PRIORITY_SCHEDULING:
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return _POSIX_THREAD_PRIORITY_SCHEDULING;
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case _SC_THREAD_PROCESS_SHARED:
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return _POSIX_THREAD_PROCESS_SHARED;
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case _SC_THREAD_SAFE_FUNCTIONS:
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return _POSIX_THREAD_SAFE_FUNCTIONS;
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case _SC_TIMERS:
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return _POSIX_TIMERS;
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}
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/* Invalid input or unimplemented sysconf name */
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set_errno (EINVAL);
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return -1;
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}
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