问通过打开和读取来检测可用的设备

EN

int fd,fd1;
fd_set readfds;
int maxfd;

fd = open("/dev/ttyUSB0");
if(fd<0) printf("device not available\n");//How can i Wait here until device becomes available?.. Also when it shows device not available it will just continue on doing select.
printf("device /dev/ttyUSB0 available\n"); 

fd1 = open("/dev/ttyUSB1");
if(fd<0) printf("device not available\n");//How can i Wait here until device becomes available?
printf("device /dev/ttyUSB1 available\n");

maxfd = MAX(fd,fd1)+1;

while(1){

FD_SET(fd,&readfds);
FD_SET(fd1,&readfds);

select(maxfd, &readfds, NULL, NULL, NULL);

if(FD_ISSET(fd,&readfds){

// Read the device. If there is nothing to read then device has been removed or something happend.

}

if(FD_ISSET(fd1,&readfds){

// Read the device. If there is nothing to read then device has been removed or something happend.

}


}