Re: reading GIOChannel causes "Segmentation fault"

[Sven Herzberg <herzi runbox com>]

Am 20 Aug 2001 19:29:08 -0400 schrieb David Helder:
> You need to allocate memory for the buffer.
>
> David
>
>
> On 19 Aug 2001, Sven Herzberg wrote:
>
> > Hi,
> > when running the following piece of code, i get a "Segmentation fault"
> > error.
> >
> > (009)       Client::Client() {
> > ..
> > (012)         pipe(fdFromDonkey);
> > ..
> > (016)         pidDonkey = fork();
> > (017)         if (pidDonkey == 0) {
> > ..
> > (023)           dup2(fdFromDonkey[1], fileno(stdout));
> > ..
> > (028)           close(fdFromDonkey[0]);
> > ..
> > (031)           gchar *argvDonkey[1] = NULL;
> > (032)           gchar **argvDonkeyPointer = argvDonkey;
> > (033)           execv("./donkey",argvDonkeyPointer);
> > ..
> > (036)         }
> > ..
> > (040)         fromDonkey = g_io_channel_unix_new(fdFromDonkey[1]);
> > ..
> > (043)         g_io_add_watch(fromDonkey, G_IO_IN, parseText, this);
> > ..
> > (045)       }
> >
> >
> > (056)       gboolean parseText(GIOChannel *source, GIOCondition condition,
> >                        gpointer client) {
    (057)         uint *readBytes = 0;
    (058)         char buffer[4096];
> > ..
> > (064)         g_io_channel_read(source, buffer, 1, readBytes);
> > ..
> > (071)         return false;
> > (072)       }
> >
> > When my program reaches line (064), it tells me "Segmentatio fault" and
> > exits. Why does this happen?
> >
> > --
> > sven

Changed it to the prevous (remember this is c++). All values are
initialized.

it's still segfaulting.

Does anyone have example code? (i'm getting weird)

--
sven