On Sat, Mar 03, 2007 at 01:56:19PM +0100, Dag Leine wrote:
> Hallo,
>
> I've just played aroudn with the popen(2)-call. After getting a
> segmentation fault on a quite old OpenBSD 3.8 machine I've tried to
> understand the source.
>
> /usr/src/lib/libc/gen/popen.c
>
> what I am missing is the initialization of *pidlist. If I initialize
> this static pointer with NULL everything seems to work fine.
>
> Did I missunderstand the source or the usage of popen??
>
> Thanks for Comments
> Dag
>
>
> The simple test programm (which dies only on ONE machine):
>
>
> #include <stdio.h>
> #include <stdlib.h>
>
> FILE *p;
>
> int main(void)
> {
> if(NULL == (p = popen("/bin/cat", "w")))
> {
> printf("popen() failed\n");
> exit(1);
> }
> fprintf(p, "hallo to pipe\n");
> printf("pclose exiting with %d\n", pclose(p));
>
> return(0);
> }
>
>
static struct pid {
// ...
} *pidlist;
is defined at file scope (and static). It should be initialised to the
default value 0 by the compiler.
Your testprogram also looks ok, are you sure this machine doesn't have
a hardware problem?
Tobias
