[uClibc] WEXITSTATUS

[Joel Coltoff]

On Thu, 21 Nov 2002, Gerhard Uttenthaler wrote:

>
> Hello,
>
> some time ago I asked about the following, but got never any respond. So
>     I try again...
>
> The WEXITSTATUS() macro should return the least significant 8 bits, but
> the implementation in  "libc/sysdeps/linux/common/bits/waitstatus.h"
> return the higher 8bits:
> #define       __WEXITSTATUS(status)   (((status) & 0xff00) >> 8)
>

It's a misleading comment. What it means is the exit value in a program
is limited to 8 bits. You have broken the code. Try this.

main()
{

    int status;

    if ( fork() == 0 )
    {

// Child - exits with a status of 0x104
// (status value == 0x00000400) and not
//                  0x00010400
	sleep(1);     // don't exit before parent waits
	exit(0x104);
    }
    wait(&status);
    printf( "status = 0x%08x\n", status);

}

-- 
Joel Coltoff

What lies behind us and what lies before us are tiny matters
compared to what lies within us.
    -- Oliver Holmes