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qemu-char: convert parallel backend to data-driven creation

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Conversion to Error * brings better error messages; before:

    qemu-system-x86_64: -chardev id=serial,backend=parallel,path=vl.c: Failed to create chardev

After:

    qemu-system-x86_64: -chardev id=serial,backend=parallel,path=vl.c: not a parallel port: Inappropriate ioctl for device

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-10-12 09:49:28 +02:00
parent 6511d39679
commit 38bfb1a63d
1 changed files with 15 additions and 16 deletions
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31
qemu-char.c
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@ -1753,12 +1753,13 @@ static void pp_close(CharDriverState *chr)
qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
}
static CharDriverState *qemu_chr_open_pp_fd(int fd)
static CharDriverState *qemu_chr_open_pp_fd(int fd, Error **errp)
{
CharDriverState *chr;
ParallelCharDriver *drv;
if (ioctl(fd, PPCLAIM) < 0) {
error_setg_errno(errp, errno, "not a parallel port");
close(fd);
return NULL;
}
@ -1818,7 +1819,7 @@ static int pp_ioctl(CharDriverState *chr, int cmd, void *arg)
return 0;
}
static CharDriverState *qemu_chr_open_pp_fd(int fd)
static CharDriverState *qemu_chr_open_pp_fd(int fd, Error **errp)
{
CharDriverState *chr;
@ -3481,6 +3482,7 @@ static void qemu_chr_parse_serial(QemuOpts *opts, ChardevBackend *backend,
}
#endif
#ifdef HAVE_CHARDEV_PARPORT
static void qemu_chr_parse_parallel(QemuOpts *opts, ChardevBackend *backend,
Error **errp)
{
@ -3493,6 +3495,7 @@ static void qemu_chr_parse_parallel(QemuOpts *opts, ChardevBackend *backend,
backend->parallel = g_new0(ChardevHostdev, 1);
backend->parallel->device = g_strdup(device);
}
#endif
static void qemu_chr_parse_pipe(QemuOpts *opts, ChardevBackend *backend,
Error **errp)
@ -4044,13 +4047,6 @@ static CharDriverState *qmp_chardev_open_serial(const char *id,
return qemu_chr_open_win_path(serial->device, errp);
}
static CharDriverState *qmp_chardev_open_parallel(ChardevHostdev *parallel,
Error **errp)
{
error_setg(errp, "character device backend type 'parallel' not supported");
return NULL;
}
#else /* WIN32 */
static int qmp_chardev_open_file_source(char *src, int flags,
@ -4110,16 +4106,19 @@ static CharDriverState *qmp_chardev_open_serial(const char *id,
#endif
#ifdef HAVE_CHARDEV_PARPORT
static CharDriverState *qmp_chardev_open_parallel(ChardevHostdev *parallel,
static CharDriverState *qmp_chardev_open_parallel(const char *id,
ChardevBackend *backend,
ChardevReturn *ret,
Error **errp)
{
ChardevHostdev *parallel = backend->parallel;
int fd;
fd = qmp_chardev_open_file_source(parallel->device, O_RDWR, errp);
if (fd < 0) {
return NULL;
}
return qemu_chr_open_pp_fd(fd);
return qemu_chr_open_pp_fd(fd, errp);
}
#endif
@ -4265,11 +4264,9 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
case CHARDEV_BACKEND_KIND_SERIAL:
abort();
break;
#ifdef HAVE_CHARDEV_PARPORT
case CHARDEV_BACKEND_KIND_PARALLEL:
chr = qmp_chardev_open_parallel(backend->parallel, &local_err);
abort();
break;
#endif
case CHARDEV_BACKEND_KIND_PIPE:
chr = qemu_chr_open_pipe(backend->pipe);
break;
@ -4405,10 +4402,12 @@ static void register_types(void)
register_char_driver("tty", CHARDEV_BACKEND_KIND_SERIAL,
qemu_chr_parse_serial, qmp_chardev_open_serial);
#endif
#ifdef HAVE_CHARDEV_PARPORT
register_char_driver("parallel", CHARDEV_BACKEND_KIND_PARALLEL,
qemu_chr_parse_parallel, NULL);
qemu_chr_parse_parallel, qmp_chardev_open_parallel);
register_char_driver("parport", CHARDEV_BACKEND_KIND_PARALLEL,
qemu_chr_parse_parallel, NULL);
qemu_chr_parse_parallel, qmp_chardev_open_parallel);
#endif
register_char_driver("pty", CHARDEV_BACKEND_KIND_PTY, NULL,
NULL);
register_char_driver("console", CHARDEV_BACKEND_KIND_CONSOLE, NULL,