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55 lines
1.2 KiB
55 lines
1.2 KiB
// for mmap
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#include <sys/mman.h>
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// for random
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#include <stdlib.h>
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// for open and fstat
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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// for puts
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#include <stdio.h>
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// for time
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#include <time.h>
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int
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main(int argc, char * argv[])
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{
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struct stat st;
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char * map;
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size_t position;
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char print_buf[101];
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int i;
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print_buf[100] = '\0';
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int fd = open("./mmapfiletest.c", O_RDONLY);
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fstat(fd, &st);
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map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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srandom(time(NULL));
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position = random() % (st.st_size - 100);
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for (i=0; i<100; i+=10) {
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print_buf[i+0] = map[position + i + 0];
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print_buf[i+1] = map[position + i + 1];
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print_buf[i+2] = map[position + i + 2];
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print_buf[i+3] = map[position + i + 3];
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print_buf[i+4] = map[position + i + 4];
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print_buf[i+5] = map[position + i + 5];
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print_buf[i+6] = map[position + i + 6];
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print_buf[i+7] = map[position + i + 7];
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print_buf[i+8] = map[position + i + 8];
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print_buf[i+9] = map[position + i + 9];
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}
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puts(print_buf);
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return 0;
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}
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// vim: set et ts=4 sw=4:
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