Re: 5.9.1 release now integrated into ponie

On Apr 29, 2004, at 8:04 AM, Nicholas Clark wrote:

>> ../lib/warnings.t                           503    1   0.20%  224
>
> This is this test:
...
> exec $^X, "-e0" ;
>
> and it is failing with ENOTSUP. Really. I checked with ktrace:
...
> Of course, this can't be happening, as the OS X man page doesn't list 
> ENOTSUP as a possible return from execve. Hence I don't know where to 
> look next.
> (Darwin source code....?)

It turns out that you can't execve with more than one running thread 
(apparently). The code below demonstrates. I don't know why this is the 
case (or why the test code is hitting this), but I figured this out by 
looking at the kernel source code (xnu project, in Darwin).

JEff

----------------------------------------------------------------------

#include <stdio.h>
#include <unistd.h>
#include <errno.h>

extern char **environ;

void* doNothing(void *data)
{
     while(1) {}
     return NULL;
}

int main (int argc, const char * argv[])
{
     pthread_t thread;
     int retVal;

     printf("Starting!\n");

     pthread_create(&thread, NULL, doNothing, NULL);

     retVal = execve("/usr/bin/true", argv, environ);

     printf("retVal = %d, errno = %d\n", retVal, errno);
     perror(NULL);

     return 0;
}
/*
output:

Starting!
retVal = -1, errno = 45
Operation not supported
*/