Date: Tue, 25 Aug 1998 22:32:24 +0200 From: freebsd-emulation@bland.fido.de (freebsd-emulation) To: freebsd-emulation@FreeBSD.ORG (UUCP) Subject: Linux termios problem Message-ID: <MSGID_242=3A7600=2F1.0_5e3114c0@Fido.DE>
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Hello!
I am running FreeBSD 2.2.5 and seem to have a problem with the termios code of
the Linux emulation.
In order to implement something like "kbhit()" (a function to query if any
characters are waiting in the console input queue), I use code similar to the
following example program:
#include <termios.h>
#include <stdio.h>
int main(void)
{
struct termios tios;
char c;
tcgetattr(0, &tios);
tios.c_lflag &= ~(ICANON | ISIG);
tios.c_lflag &= ~ECHO;
tios.c_cc[VMIN] = 0;
tios.c_cc[VTIME] = 0;
tcsetattr(0, 0, &tios);
setbuf(stdin, NULL);
c = getchar();
return c;
}
With the flags that I set, the getchar() function is supposed to return
immediately even if no character could be read. (In this case, it should return
EOF and I afterwards have to clear the errorflag from stdin, but this does not
matter for the test program).
The code from above works if I compile it natively for FreeBSD, and it works if
I compile it with the linux crossdevelopment package and run the executable on
a Linux box. However, it does not work if I try to run the resulting Linux
executable on FreeBSD in Linux emulation mode. There, the getchar() function
blocks for a very long time (minutes) before it returns.
Is this a bug in my code (if so, please tell me where), or is it a problem with
the Linux emulation of FreeBSD?
Viele Gruesse,
Tobias
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