First, always check for errors. Capture the return value, and if it is not 0 (success), then call perror(), to print the error. You must check errors on these types of functions and handle them, otherwise, the bigger the program, the more likely that you will have mysterious unknown errors at times that you can not figure out. For this particular call, you can not call on any old fd, it much be a serial port. You might get the error, not a tty or something like that as I recall. As I recall, I typically call isatty() to check to see if the fd is valid for setting baud rate, before continuing.
Hope that helps!
Don.
On 14 Apr 2007 21:28:40 -0700, Rob <> wrote:
When I make a call the output is unexpected
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
#include <sys/select.h>
void print_configuration(int file_id)
{
struct termios options;
tcgetattr (file_id, &options);
printf("speed in %u out %u\n", options.c_ispeed, options.c_ospeed);
printf("mode in %u out %u\n", options.c_iflag, options.c_oflag);
printf("control flag %u\n", options.c_cflag);
printf("local flag %u\n", options.c_lflag);
}
I get an output of in 2147483140 out 34044
This is with the speed set using stty to 19200
The file descriptor is valid (I can read data on it in other calls)
-- Dr. Don W. Carr J. G. Montenegro 2258 Guadalajara, Mexico +52-333-630-0704 +52-333-836-4500 ext 2930
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