67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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/* Copyright (C) 2005 David Decotigny
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#include <libc.h>
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#include <stdarg.h>
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#include <debug.h>
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/**
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* @file myprog8.c
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* Make sure that shared mappings (here: anonymous shared mapping) are
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* really shared between father and child
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*/
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int main(void)
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{
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int i;
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char *zoup;
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int fd;
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fd = open("/dev/zero", O_RDWR);
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zoup = mmap((void*)4096, 8*1024*1024,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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fd, 0x123456789012345ULL);
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close(fd);
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bochs_printf("mapped @%x\n", (unsigned)zoup);
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switch (fork())
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{
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case 0:
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bochs_printf("CHILD 1: %d %d\n", zoup[42], zoup[43]);
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for (i = 0 ; i < 1000000 ; i++)
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zoup[43] = i / 19;
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bochs_printf("CHILD 2: %d %d\n", zoup[42], zoup[43]);
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for (i = 0 ; i < 1000000 ; i++)
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zoup[43] = i / 19;
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bochs_printf("CHILD 3: %d %d\n", zoup[42], zoup[43]);
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break;
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default:
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bochs_printf("FATHER 1: %d %d\n", zoup[42], zoup[43]);
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for (i = 0 ; i < 1000000 ; i++)
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zoup[42] = i / 17;
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bochs_printf("FATHER 2: %d %d\n", zoup[42], zoup[43]);
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break;
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}
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return 0;
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}
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