[uClibc]Small bug with stdout [stdio.c]

[Manuel Novoa III]

On Mon, 19 Feb 2001, AVENARD,JEAN-YVES (HP-Australia,ex2) wrote:
> Well, the problem happened in the latest version of crt0.S which called
> __uClibc_main.c
> 
> Changing stdio.c definitely fixed the problem with sash

Please run the following test program against uClibc with an unpatched stdio.c.
You can ignore the warning... that's just gcc complaining about %b in the
format string.  %b is a uClibc extension for binary output of an unsigned int
and behaves somewhat like %x.

[mjn3 at mars mini]$ cat buf.c
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

int main(void)
{
        printf("stdout->mode = %032b  isatty(stdout->fd) = %d\n",
		(unsigned) stdout->mode, isatty(stdout->fd));
        return EXIT_SUCCESS;
}

[mjn3 at mars mini]$ gcc-uClibc-i386 -Wall buf.c && ./a.out && ./a.out | cat
buf.c: In function `main':
buf.c:8: warning: unknown conversion type character `b' in format
buf.c:8: warning: too many arguments for format
stdout->mode = 00000000000000000000000000100101  isatty(stdout->fd) = 1
stdout->mode = 00000000000000000000000000100100  isatty(stdout->fd) = 0

The last two bits of mode are the buffering mode.  Note that stdout is line
buffered in the first case -- writing to a tty, but is fully buffered when
writing to the pipe.

If this isn't the output you get, then I would think that that either

1) __uClibc_main is not being run
2) __init_stdio is not being run
3) isatty is not working correctly

because you've said that actually initializing the buffering mode to line
buffering works.

Manuel