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I'm not sure we should "fix" this, because Cygwin's behavior is consistent with the Linux man page, and Linux's behavior is not. But I thought I should point it out for the sake of discussion, because Cygwin generally tries to emulate Linux. Here are the details: The Linux man page for cfsetspeed(3) specifies that the speed argument must be one of the constants Bnnn (e.g., B9600) defined in termios.h. But Linux in fact allows the speed to be the numerical baud rate (e.g., 9600). Test case: $ cat cfsetspeed_test.c #include #include int main () { struct termios tp; printf ("Calling cfsetspeed with speed B9600\n"); if (cfsetspeed (&tp, B9600) < 0) perror ("cfsetspeed"); else printf ("cfgetispeed reports speed %u\n", cfgetispeed (&tp)); printf ("Calling cfsetspeed with speed 9600\n"); if (cfsetspeed (&tp, 9600) < 0) perror ("cfsetspeed"); else printf ("cfgetispeed reports speed %u\n", cfgetispeed (&tp)); } $ gcc cfsetspeed_test.c $ ./a.out Calling cfsetspeed with speed B9600 cfgetispeed reports speed 13 Calling cfsetspeed with speed 9600 cfgetispeed reports speed 13 On Cygwin, however, the output of the same program is: $ ./a Calling cfsetspeed with speed B9600 cfgetispeed reports speed 13 Calling cfsetspeed with speed 9600 cfsetspeed: Invalid argument If we decide that Cygwin should emulate Linux here, it would be a simple matter to copy the glibc code, which checks whether the speed is a numerical baud rate and, if so, converts it to a Bnnn constant. Ken