47 lines
841 B
C
47 lines
841 B
C
#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#define FILE_SIZE 1024
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#define CMD_SIZE 128
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int main(int argc, char* argv[])
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{
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int fd;
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void *file_map;
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long page_size, file_map_size;
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char command[CMD_SIZE];
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if (argc < 2) {
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printf("Error: too few arguments\n");
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return -1;
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}
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fd = open(argv[1], O_RDWR);
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if (fd < 0) {
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printf("Error: open %s\n", argv[1]);
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return -1;
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}
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page_size = sysconf(_SC_PAGESIZE);
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file_map_size = (FILE_SIZE / page_size + 1) * page_size;
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file_map = mmap(0, file_map_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (file_map == MAP_FAILED) {
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printf("Error: mmap file\n");
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return -1;
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}
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sprintf(command, "cat /proc/%d/maps", getpid());
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system(command);
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close(fd);
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munmap(file_map, file_map_size);
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return 0;
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}
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