37 lines
790 B
C
37 lines
790 B
C
#include <stdio.h>
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#include <unistd.h>
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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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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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uint8_t buffer[512] = { 0 };
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int main(int argc, char *argv[])
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{
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int fd;
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int ret;
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fd = open(argv[1], O_RDWR);
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if (fd < 0) {
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printf("open failed!\r\n");
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return -1;
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}
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if (!strcmp("read", argv[2])) {
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printf("read data from kernel\r\n");
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ret = read(fd, buffer, sizeof(buffer));
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printf("ret len:%d data:%s\r\n", ret, buffer);
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} else if (!strcmp("write", argv[2])) {
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printf("write data to kernel %s len:%ld\r\n", argv[3], strlen(argv[3]));
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ret = write(fd, argv[3], strlen(argv[3]));
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printf("ret len:%d\r\n", ret);
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} else {
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printf("please input correct para, read/write\r\n");
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}
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close(fd);
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return 0;
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}
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