mirror of
https://github.com/Hizenberg469/Driver-tutorial.git
synced 2026-04-19 16:32:23 +03:00
27 lines
604 B
C
27 lines
604 B
C
#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <errno.h>
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int main(){
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int fd, i;
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ssize_t ret;
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char my_buf[12] = "Hello world";
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fd = open( "/dev/demo_cdrv", O_RDWR);
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if(fd < 0){
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printf("failed acquiring file descriptor return status %d\n", fd);
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}
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/* Write the contents of my buffer into the device */
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ret = write(fd, my_buf, 8);
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ret = read(fd, my_buf, 12);
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if( ret < 0 )
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printf("read operation failed with return status %d\n", ret);
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close(fd);
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return 0;
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} |