sos-code-article10/userland/myprog10.c

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2018-07-13 17:13:10 +02:00
/* Copyright (C) 2005 David Decotigny
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
#include <crt.h>
#include <libc.h>
#include <stdarg.h>
#include <debug.h>
/**
* @file myprog10.c
*
* mprotect tests
*
* We use the temporary syscall 4004 to dump the list of VRs in the
* thread's address space
*/
int main(void)
{
char * zoup;
int fd;
fd = open("/dev/zero", O_RDWR);
zoup = mmap((void*)4096, 8*1024*1024,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd, 34);
close(fd);
bochs_printf("mapped @%x\n", (unsigned)zoup);
/* Do some forks to complicate things */
fork();
fork();
_sos_syscall1(4004, (unsigned)"Initial");
mprotect(zoup, 10*4096, PROT_READ);
zoup += 10*4096;
_sos_syscall1(4004, (unsigned)"After mprotect Low");
mprotect(zoup-4096, 2*4096, PROT_READ);
zoup += 4096;
_sos_syscall1(4004, (unsigned)"After mprotect Before Low");
mprotect(zoup-4096, 4096, PROT_READ);
_sos_syscall1(4004, (unsigned)"After mprotect Before low (bis)");
mprotect(zoup + 1024*1024, 4096, PROT_READ);
_sos_syscall1(4004, (unsigned)"After mprotect Middle");
mprotect(zoup + 1024*1024, 4096, PROT_READ);
_sos_syscall1(4004, (unsigned)"After mprotect Middle (bis)");
mprotect(zoup + 8*1024*1024 - 11*4096 - 4096, 4096, PROT_READ);
_sos_syscall1(4004, (unsigned)"After mprotect High");
mprotect(zoup + 8*1024*1024 - 11*4096 - 2*4096, 3*4096, PROT_READ);
_sos_syscall1(4004, (unsigned)"After mprotect Past High");
mprotect((void*)0x40000000, 0x10000000, PROT_READ);
_sos_syscall1(4004, (unsigned)"After mprotect Complete VR");
mprotect((void*)0x40000000, 0x10000000, PROT_READ);
_sos_syscall1(4004, (unsigned)"After mprotect Complete VR (bis)");
return 0;
}