mirror of
https://github.com/ioacademy-jikim/device_driver
synced 2025-06-07 07:56:08 +00:00
35 lines
572 B
C
35 lines
572 B
C
#if 1
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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int main()
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{
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int fd;
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char *p;
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printf("main=%p\n", main);
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fd = open("aaa", O_RDWR | O_TRUNC | O_CREAT , 0666 );
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ftruncate(fd, 1024);
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p = mmap(0, 1024, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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strcpy( p , "hello world\n");
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//printf("%s\n", p );
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munmap(p, 1024);
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close(fd);
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return 0;
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}
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#endif
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#if 0
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#include <fcntl.h>
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int main()
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{
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//mmap();
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int fd;
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fd = open("aaa", O_WRONLY | O_TRUNC | O_CREAT , 0666 );
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write( fd, "hello world", 11 );
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close(fd);
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return 0;
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}
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#endif
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