?? read_dev_mem.c
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/* * Written by Der Herr Hofrat, der.herr@hofr.at * (C) 2002 FSMLabs * License: GPL Version 2 *//* * Example of reading shared memory from user-space */#include <stdlib.h>#include <stdio.h>#include <fcntl.h>#include <unistd.h>#include <sys/mman.h>#include "hello.h"struct shared_mem_struct* shared_mem;int memfd;int main(){ char input[40]; memfd = open("/dev/mem", O_RDONLY); if (memfd) { shared_mem = (struct shared_mem_struct*) mmap(0, sizeof(struct shared_mem_struct), PROT_READ, MAP_FILE | MAP_SHARED, memfd, MEMORY_OFFSET); if (shared_mem != NULL) { do { printf("found: %d %d\n", shared_mem->some_int, (int)shared_mem->ready); sleep(1); } while (1); } else printf("Failed to map memory\n"); close (memfd); } else{ printf("Failed to open memory device file\n"); exit(-1); } close(memfd); return 0;}
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