On Jan 2, 2007, at 12:39 PM, Mayur Shah wrote:

I have a C program that tries to write to the serial port on the gumstix device. I get a return value of -1 when I try to write to the serial port using this command,

write(sportfd, &char_reg, sizeof(char_reg) 

Not sure why I am not able to write even a single byte of data.

     Upon successful completion the number of bytes which were written is
     returned.  Otherwise a -1 is returned and the global variable errno is
     set to indicate the error.

So.... what is errno set to after write() returns -1?