use-mmap-method.zip_mmap_space

#include <sys/types.h> #include <sys/mman.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> int main(int args, char **argv) { char *addr; int fd = open("hw4.test", O_RDWR|O_CREAT, S_IRWXU); if (fd < 0) { printf("open failed."); return 0; } ftruncate(fd, 16); //少了這行會發生Bus error addr = mmap(NULL, 16, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_32BIT, fd, 0); if (!addr){ printf("mmap() failed"); return 0; } *((unsigned char *) (addr + 0x00)) = 'H'; *((unsigned char *) (addr + 0x01)) = 'e'; *((unsigned char *) (addr + 0x02)) = 'l'; *((unsigned char *) (addr + 0x03)) = 'l'; *((unsigned char *) (addr + 0x04)) = 'o'; *((unsigned char *) (addr + 0x05)) = '!'; *((unsigned char *) (addr + 0x06)) = '4'; *((unsigned char *) (addr + 0x07)) = '0'; *((unsigned char *) (addr + 0x08)) = '0'; *((unsigned char *) (addr + 0x09)) = '4'; *((unsigned char *) (addr + 0xA)) = '1'; *((unsigned char *) (addr + 0xB)) = '0'; *((unsigned char *) (addr + 0xC)) = '0'; *((unsigned char *) (addr + 0xD)) = '2'; *((unsigned char *) (addr + 0xE)) = '8'; *((unsigned char *) (addr + 0xF)) = '\n'; //memcpy(p, name, strlen(name) + 1); munmap(addr, 16); close(fd); return 0; }