97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
/* sysconf.cc
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Copyright 1996, 1997, 1998 Cygnus Solutions.
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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 <errno.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 "fhandler.h"
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#include "dtable.h"
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#include "cygerrno.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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/* FIXME: this returns the current limit which can increase
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if and when dtable::find_unused_handle is called. Perhaps
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we should return NOFILE or OPEN_MAX instead? */
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return fdtab.size;
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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_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 (os_being_run != winNT)
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return 1;
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/*FALLTHRU*/
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case _SC_PHYS_PAGES:
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case _SC_AVPHYS_PAGES:
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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_win_error (RtlNtStatusToDosError (ret));
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debug_printf("NtQuerySystemInformation: ret = %d, "
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"Dos(ret) = %d",
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ret, RtlNtStatusToDosError (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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return sbi.ActiveProcessors;
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case _SC_PHYS_PAGES:
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return sbi.NumberOfPhysicalPages;
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case _SC_AVPHYS_PAGES:
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return sbi.HighestPhysicalPage - sbi.LowestPhysicalPage + 1;
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}
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}
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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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