?? posix_app.c
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#include <fcntl.h>#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <errno.h>#define NANOSECONDS_PER_TICK (double)((double)1000.00/(double)366.00) int main(int argc, char ** argv){ int fd; int count=0 ; struct { int count; unsigned int d;}D; double f; if( (fd = open("/dev/rtf0",O_RDONLY) ) < 0 ){ perror("Can't open fifo"); exit(0); } while( (read(fd,&D,sizeof(D)) == sizeof(D))){ f = (double)D.d; f = ((f) * NANOSECONDS_PER_TICK)/1000; printf("Delay was %f microseconds\n",f); if(count && (count+1 != D.count)) printf("Dropped a packet at %d ",count); count = D.count; } close(fd); return 0;}?? 快捷鍵說明
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