/* sysconf.cc Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc. This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include #include #include #include #include "security.h" #include "fhandler.h" #include "path.h" #include "dtable.h" #include "cygerrno.h" #include "cygheap.h" #include "ntdll.h" /* sysconf: POSIX 4.8.1.1 */ /* Allows a portable app to determine quantities of resources or presence of an option at execution time. */ long int sysconf (int in) { switch (in) { case _SC_ARG_MAX: /* FIXME: what's the right value? _POSIX_ARG_MAX is only 4K */ return 1048576; case _SC_OPEN_MAX: { long max = getdtablesize (); if (max < OPEN_MAX) max = OPEN_MAX; return max; } case _SC_PAGESIZE: return getpagesize (); case _SC_CLK_TCK: return CLOCKS_PER_SEC; case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL; case _SC_CHILD_MAX: return CHILD_MAX; case _SC_NGROUPS_MAX: return NGROUPS_MAX; case _SC_SAVED_IDS: return _POSIX_SAVED_IDS; case _SC_LOGIN_NAME_MAX: case _SC_GETPW_R_SIZE_MAX: case _SC_GETGR_R_SIZE_MAX: return 16*1024; case _SC_VERSION: return _POSIX_VERSION; #if 0 /* FIXME -- unimplemented */ case _SC_TZNAME_MAX: return _POSIX_TZNAME_MAX; case _SC_STREAM_MAX: return _POSIX_STREAM_MAX; #endif case _SC_NPROCESSORS_CONF: case _SC_NPROCESSORS_ONLN: if (!wincap.supports_smp ()) return 1; /*FALLTHRU*/ case _SC_PHYS_PAGES: case _SC_AVPHYS_PAGES: if (wincap.supports_smp ()) { NTSTATUS ret; SYSTEM_BASIC_INFORMATION sbi; if ((ret = NtQuerySystemInformation (SystemBasicInformation, (PVOID) &sbi, sizeof sbi, NULL)) != STATUS_SUCCESS) { __seterrno_from_win_error (RtlNtStatusToDosError (ret)); debug_printf ("NtQuerySystemInformation: ret = %d, " "Dos(ret) = %d", ret, RtlNtStatusToDosError (ret)); return -1; } switch (in) { case _SC_NPROCESSORS_CONF: return sbi.NumberProcessors; case _SC_NPROCESSORS_ONLN: { int i = 0; do if (sbi.ActiveProcessors & 1) i++; while (sbi.ActiveProcessors >>= 1); return i; } case _SC_PHYS_PAGES: return sbi.NumberOfPhysicalPages; case _SC_AVPHYS_PAGES: return sbi.HighestPhysicalPage - sbi.LowestPhysicalPage + 1; } } break; } /* Invalid input or unimplemented sysconf name */ set_errno (EINVAL); return -1; }