Mail Archives: cygwin/2005/01/20/03:20:47
On Wed, Jan 19, 2005 at 09:08:13PM -0600, Gary R. Van Sickle wrote:
>
> > -----Original Message-----
> > From: cygwin-owner AT cygwin DOT com
> > [mailto:cygwin-owner AT cygwin DOT com] On Behalf Of Yitzchak Scott-Thoennes
> > Sent: Wednesday, January 19, 2005 5:34 PM
> > To: cygwin AT cygwin DOT com
> > Subject: Re: cygwin programs called from non-cygwin programs
> > mauling \" in args
> >
> > On Wed, Jan 12, 2005 at 10:42:48PM -0800, Yitzchak
> > Scott-Thoennes wrote:
> > > $ cat child.c
> > > #include <stdio.h>
> > > int main(int argc, char **argv)
> > > {
> > > printf("[%s]\n", argv[1]);
> > > return 0;
> > > }
> > >
> > > $ cat parent.c
> > > #include <unistd.h>
> > > int main(int argc, char **argv) {
> > > char *args[] = { argv[1], "a\\\"b\\\"c", 0};
> > > execv( argv[1], args);
> > > return 1;
> > > }
> > >
> > > $ gcc -mno-cygwin -Wall parent.c -o nocygparent
> > > parent.c: In function `main':
> > > parent.c:4: warning: passing arg 2 of `execv' from incompatible
> > > pointer type
> > >
> > > $ gcc -Wall child.c -o cygchild
> > >
> > > $ ./nocygparent cygchild
> > > [a\b"c]
> >
> > Can anybody else confirm this?
> >
>
> Lessee....
>
> ...sorta. I get:
>
> "
> $ ./nocygparent cygchild
>
> ~
> $ [a\b"c]
> "
>
> And then it sits there waiting for input. When I hit enter it quits and
> brings me back to the prompt. This is with snapshot 20050116 and gcc (GCC)
> 3.4.1 (cygming special).
>
> What happens if you correct the warning?
The error is the fault of the mingw headers being incorrect for exec*,
but makes no difference. (SuSv3 whines at length about why the headers
need to be as they should be.)
See the $ before the [ there? That's a shell prompt. The program already
ended, but the output is a little scrambled (which seems to happen a lot
when there are child processes of late). Not related to the problem I'm
describing.
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