include <stdio.h>
#include <sys/select.h>
static void sleep_ms(unsigned int secs)

{

struct timeval tval;

tval.tv_sec=secs/1000;

tval.tv_usec=(secs*1000)%1000000;

select(0,NULL,NULL,NULL,&tval);

}
比如说延时0.2s
sleep_ms(200)

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