74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
/*
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* \brief C-library back end
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* \author Norman Feske
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* \date 2008-11-11
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*/
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/*
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* Copyright (C) 2008-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <base/printf.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include "libc_debug.h"
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extern "C" int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
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void *newp, size_t newlen)
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{
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int i;
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raw_write_str("__sysctl called\n");
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/*
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* During printf, __sysctl is called by malloc with the parameters
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*
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* name[0] == 6 (CTL_HW)
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* name[1] == 3 (HW_NCPU)
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*
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* In this case, we can return -1, and the libC assumes that we
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* have one CPU.
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*/
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if ((name[0] == CTL_HW) && (name[1] == HW_NCPU))
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return -1;
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/*
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* CTL_P1003_1B is used by sysconf(_SC_PAGESIZE) to determine
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* the actual page size.
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*/
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if (((name[0] == CTL_HW) && (name[1] == HW_PAGESIZE)) ||
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((name[0] == CTL_P1003_1B) && (name[1] == CTL_P1003_1B_PAGESIZE))) {
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int result = 4096;
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if (oldp) {
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if (*oldlenp >= sizeof(result)) {
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*(int*)oldp = result;
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*oldlenp = sizeof(result);
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return 0;
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} else {
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PERR("not enough room to store the old value");
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return -1;
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}
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} else {
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PERR("cannot store the result in oldp, since it is NULL");
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return -1;
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}
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}
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raw_write_str(newp ? "newp provided\n" : "no newp provided\n");
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for (i = 0; i < name[0]; i++)
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raw_write_str("*");
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raw_write_str("\n");
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for (i = 0; i < name[1]; i++)
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raw_write_str("%");
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raw_write_str("\n");
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return 0;
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}
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