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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <libc.h> 019 #include <libc.h> 020 #include <stdarg.h> 020 #include <stdarg.h> 021 #include <debug.h> 021 #include <debug.h> 022 022 023 023 024 /** 024 /** 025 * @file myprog8.c 025 * @file myprog8.c 026 * Make sure that shared mappings (here: anony 026 * Make sure that shared mappings (here: anonymous shared mapping) are 027 * really shared between father and child 027 * really shared between father and child 028 */ 028 */ 029 029 030 int main(void) !! 030 int main() 031 { 031 { 032 int i; 032 int i; 033 char *zoup; 033 char *zoup; 034 int fd; 034 int fd; 035 035 036 fd = open("/dev/zero", O_RDWR); 036 fd = open("/dev/zero", O_RDWR); 037 zoup = mmap((void*)4096, 8*1024*1024, 037 zoup = mmap((void*)4096, 8*1024*1024, 038 PROT_READ | PROT_WRITE, 038 PROT_READ | PROT_WRITE, 039 MAP_SHARED, 039 MAP_SHARED, 040 fd, 0x123456789012345ULL); 040 fd, 0x123456789012345ULL); 041 close(fd); 041 close(fd); 042 042 043 bochs_printf("mapped @%x\n", (unsigned)zoup) 043 bochs_printf("mapped @%x\n", (unsigned)zoup); 044 044 045 switch (fork()) 045 switch (fork()) 046 { 046 { 047 case 0: 047 case 0: 048 bochs_printf("CHILD 1: %d %d\n", zoup[42 048 bochs_printf("CHILD 1: %d %d\n", zoup[42], zoup[43]); 049 for (i = 0 ; i < 1000000 ; i++) 049 for (i = 0 ; i < 1000000 ; i++) 050 zoup[43] = i / 19; 050 zoup[43] = i / 19; 051 bochs_printf("CHILD 2: %d %d\n", zoup[42 051 bochs_printf("CHILD 2: %d %d\n", zoup[42], zoup[43]); 052 for (i = 0 ; i < 1000000 ; i++) 052 for (i = 0 ; i < 1000000 ; i++) 053 zoup[43] = i / 19; 053 zoup[43] = i / 19; 054 bochs_printf("CHILD 3: %d %d\n", zoup[42 054 bochs_printf("CHILD 3: %d %d\n", zoup[42], zoup[43]); 055 break; 055 break; 056 056 057 default: 057 default: 058 bochs_printf("FATHER 1: %d %d\n", zoup[4 058 bochs_printf("FATHER 1: %d %d\n", zoup[42], zoup[43]); 059 for (i = 0 ; i < 1000000 ; i++) 059 for (i = 0 ; i < 1000000 ; i++) 060 zoup[42] = i / 17; 060 zoup[42] = i / 17; 061 bochs_printf("FATHER 2: %d %d\n", zoup[4 061 bochs_printf("FATHER 2: %d %d\n", zoup[42], zoup[43]); 062 break; 062 break; 063 } 063 } 064 064 065 return 0; 065 return 0; 066 } 066 }
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