Opening ttyS0

someshss · 08-18-2005, 11:58 PM

Hi All,

I am trying to open the /dev/ttyS0 port and it is not returning from "open" system call.

The program is as follows ...

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main ()
{
int fd;
fd = open("/dev/ttyS0", O_WRONLY|O_NOCTTY); // Never returns from here
if (fd < 0) {
perror ("Error\n");
return -1;
}
printf ("Success");
close(fd);
return 0;
}

In the above program, it never returns from the "open"

What may be the reason? Please help me in this regard.

Thanks
Somesh SS

ankscorek · 08-19-2005, 04:43 AM

what distro are u using?

Jerre Cope · 08-19-2005, 08:53 AM

Are the permissions low enough on /dev/ttyS0?

someshss · 08-19-2005, 09:49 AM

Yes, Permissions are OK.

But I think I got it solved!

I just loaded serial.o driver and it returned success!

Thanks!

someshss · 08-19-2005, 09:50 AM

Can any one explain me why it was hanging and now when serial,o is loaded, why it works?

Regards

Tinkster · 08-19-2005, 08:44 PM

Because you need a driver for the serial port
to be able to use it...

Cheers,
Tink