Re: [Qemu-devel] [PATCH v3 7/9] chardev: add error reporting for qemu_chr_new_from_opts

[Luiz Capitulino <lcapitulino@redhat.com>]

On Tue, 16 Oct 2012 22:12:13 -0300
Luiz Capitulino <lcapitulino@redhat.com> wrote:

> On Mon, 15 Oct 2012 10:06:55 +0200
> Gerd Hoffmann <kraxel@redhat.com> wrote:
> 
> > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> > ---
> >  qemu-char.c |   24 +++++++++++++++---------
> >  qemu-char.h |    3 ++-
> >  vl.c        |    7 ++++++-
> >  3 files changed, 23 insertions(+), 11 deletions(-)
> > 
> > diff --git a/qemu-char.c b/qemu-char.c
> > index b082bae..e2e1da8 100644
> > --- a/qemu-char.c
> > +++ b/qemu-char.c
> > @@ -2755,19 +2755,20 @@ static const struct {
> >  };
> >  
> >  CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
> > -                                    void (*init)(struct CharDriverState *s))
> > +                                    void (*init)(struct CharDriverState *s),
> > +                                    Error **errp)
> >  {
> >      CharDriverState *chr;
> >      int i;
> >  
> >      if (qemu_opts_id(opts) == NULL) {
> > -        fprintf(stderr, "chardev: no id specified\n");
> > +        error_setg(errp, "chardev: no id specified\n");
> >          return NULL;
> >      }
> >  
> >      if (qemu_opt_get(opts, "backend") == NULL) {
> > -        fprintf(stderr, "chardev: \"%s\" missing backend\n",
> > -                qemu_opts_id(opts));
> > +        error_setg(errp, "chardev: \"%s\" missing backend\n",
> > +                   qemu_opts_id(opts));
> >          return NULL;
> >      }
> >      for (i = 0; i < ARRAY_SIZE(backend_table); i++) {
> > @@ -2775,15 +2776,15 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
> >              break;
> >      }
> >      if (i == ARRAY_SIZE(backend_table)) {
> > -        fprintf(stderr, "chardev: backend \"%s\" not found\n",
> > -                qemu_opt_get(opts, "backend"));
> > +        error_setg(errp, "chardev: backend \"%s\" not found\n",
> > +                   qemu_opt_get(opts, "backend"));
> >          return NULL;
> >      }
> >  
> >      chr = backend_table[i].open(opts);
> >      if (!chr) {
> > -        fprintf(stderr, "chardev: opening backend \"%s\" failed\n",
> > -                qemu_opt_get(opts, "backend"));
> > +        error_setg(errp, "chardev: opening backend \"%s\" failed\n",
> > +                   qemu_opt_get(opts, "backend"));
> >          return NULL;
> >      }
> >  
> > @@ -2813,6 +2814,7 @@ CharDriverState *qemu_chr_new(const char *label, const char *filename, void (*in
> >      const char *p;
> >      CharDriverState *chr;
> >      QemuOpts *opts;
> > +    Error *err = NULL;
> >  
> >      if (strstart(filename, "chardev:", &p)) {
> >          return qemu_chr_find(p);
> > @@ -2822,7 +2824,11 @@ CharDriverState *qemu_chr_new(const char *label, const char *filename, void (*in
> >      if (!opts)
> >          return NULL;
> >  
> > -    chr = qemu_chr_new_from_opts(opts, init);
> > +    chr = qemu_chr_new_from_opts(opts, init, &err);
> > +    if (error_is_set(&err)) {
> > +        fprintf(stderr, "%s\n", error_get_pretty(err));
> > +        error_free(err);
> > +    }
> >      if (chr && qemu_opt_get_bool(opts, "mux", 0)) {
> >          monitor_init(chr, MONITOR_USE_READLINE);
> >      }
> > diff --git a/qemu-char.h b/qemu-char.h
> > index 486644b..adae13e 100644
> > --- a/qemu-char.h
> > +++ b/qemu-char.h
> > @@ -88,7 +88,8 @@ struct CharDriverState {
> >   * Returns: a new character backend
> >   */
> >  CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
> > -                                    void (*init)(struct CharDriverState *s));
> > +                                    void (*init)(struct CharDriverState *s),
> > +                                    Error **errp);
> >  
> >  /**
> >   * @qemu_chr_new:
> > diff --git a/vl.c b/vl.c
> > index 5b357a3..35eb627 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -1940,8 +1940,13 @@ static int device_init_func(QemuOpts *opts, void *opaque)
> >  static int chardev_init_func(QemuOpts *opts, void *opaque)
> >  {
> >      CharDriverState *chr;
> > +    Error *err = NULL;
> >  
> > -    chr = qemu_chr_new_from_opts(opts, NULL);
> > +    chr = qemu_chr_new_from_opts(opts, NULL, &err);
> > +    if (error_is_set(&err)) {
> > +        fprintf(stderr, "%s\n", error_get_pretty(err));
> > +        error_free(err);
> > +    }
> >      if (!chr)
> >          return -1;
> 
> If you respin, please drop that check as it's not needed. Also, we usually
> name the "internal" Error variable local_err.

Forgot to say that patch looks good to me.

> 
> >      return 0;
>