sos-code-article10/userland/myprog9.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 myprog9.c
*
* mmap/munmap 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 a fork() here to complicate things */
fork();
fork();
_sos_syscall1(4004, (unsigned)"Initial");
munmap(zoup, 10*4096);
zoup += 10*4096;
_sos_syscall1(4004, (unsigned)"After munmap Low");
munmap(zoup-4096, 2*4096);
zoup += 4096;
_sos_syscall1(4004, (unsigned)"After munmap Before Low");
munmap(zoup-4096, 4096);
_sos_syscall1(4004, (unsigned)"After munmap Before Low (bis)");
munmap(zoup + 1024*1024, 4096);
_sos_syscall1(4004, (unsigned)"After munmap middle");
munmap(zoup + 1024*1024, 4096);
_sos_syscall1(4004, (unsigned)"After munmap middle (bis)");
munmap(zoup + 8*1024*1024 - 11*4096 - 4096, 4096);
_sos_syscall1(4004, (unsigned)"After munmap High");
munmap(zoup + 8*1024*1024 - 11*4096 - 2*4096, 3*4096);
_sos_syscall1(4004, (unsigned)"After munmap Past High");
munmap((void*)0x40000000, 0x10000000);
_sos_syscall1(4004, (unsigned)"After munmap Over everything");
munmap((void*)0x40000000, 0x10000000);
_sos_syscall1(4004, (unsigned)"After munmap Over everything (bis)");
return 0;
}