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char: use a const CharDriver

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No need to allocate & copy fields, let's use static const struct instead.

Add an alias field to the CharDriver structure to cover the cases where
we previously registered a driver twice under two names.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2016-10-21 16:07:45 +03:00 • committed by Paolo Bonzini
parent bd1caa3f8e
commit 0b812f3192
7 changed files with 150 additions and 85 deletions
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169
qemu-char.c
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@ -4101,27 +4101,12 @@ static void qemu_chr_parse_udp(QemuOpts *opts, ChardevBackend *backend,
}
}
typedef struct CharDriver {
const char *name;
ChardevBackendKind kind;
CharDriverParse *parse;
CharDriverCreate *create;
} CharDriver;
static GSList *backends;
void register_char_driver(const char *name, ChardevBackendKind kind,
CharDriverParse *parse, CharDriverCreate *create)
void register_char_driver(const CharDriver *driver)
{
CharDriver *s;
s = g_malloc0(sizeof(*s));
s->name = g_strdup(name);
s->kind = kind;
s->parse = parse;
s->create = create;
backends = g_slist_append(backends, s);
/* casting away const */
backends = g_slist_append(backends, (void *)driver);
}
CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
@ -4133,22 +4118,26 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
GSList *i;
ChardevReturn *ret = NULL;
ChardevBackend *backend;
const char *name = qemu_opt_get(opts, "backend");
const char *id = qemu_opts_id(opts);
char *bid = NULL;
if (qemu_opt_get(opts, "backend") == NULL) {
if (name == NULL) {
error_setg(errp, "chardev: \"%s\" missing backend",
qemu_opts_id(opts));
goto err;
}
if (is_help_option(qemu_opt_get(opts, "backend"))) {
if (is_help_option(name)) {
fprintf(stderr, "Available chardev backend types:\n");
for (i = backends; i; i = i->next) {
cd = i->data;
fprintf(stderr, "%s\n", cd->name);
fprintf(stderr, "%s\n", ChardevBackendKind_lookup[cd->kind]);
if (cd->alias) {
fprintf(stderr, "%s\n", cd->alias);
}
}
exit(!is_help_option(qemu_opt_get(opts, "backend")));
exit(0);
}
if (id == NULL) {
@ -4159,13 +4148,13 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
for (i = backends; i; i = i->next) {
cd = i->data;
if (strcmp(cd->name, qemu_opt_get(opts, "backend")) == 0) {
if (g_strcmp0(ChardevBackendKind_lookup[cd->kind], name) == 0 ||
g_strcmp0(cd->alias, name) == 0) {
break;
}
}
if (i == NULL) {
error_setg(errp, "chardev: backend \"%s\" not found",
qemu_opt_get(opts, "backend"));
error_setg(errp, "chardev: backend \"%s\" not found", name);
goto err;
}
@ -4368,20 +4357,29 @@ ChardevInfoList *qmp_query_chardev(Error **errp)
return chr_list;
}
static ChardevBackendInfoList *
qmp_prepend_backend(ChardevBackendInfoList *list, const char *name)
{
ChardevBackendInfoList *info = g_malloc0(sizeof(*info));
info->value = g_malloc0(sizeof(*info->value));
info->value->name = g_strdup(name);
info->next = list;
return info;
}
ChardevBackendInfoList *qmp_query_chardev_backends(Error **errp)
{
ChardevBackendInfoList *backend_list = NULL;
CharDriver *c = NULL;
GSList *i = NULL;
CharDriver *c;
GSList *i;
for (i = backends; i; i = i->next) {
ChardevBackendInfoList *info = g_malloc0(sizeof(*info));
c = i->data;
info->value = g_malloc0(sizeof(*info->value));
info->value->name = g_strdup(c->name);
info->next = backend_list;
backend_list = info;
backend_list = qmp_prepend_backend(backend_list,
ChardevBackendKind_lookup[c->kind]);
if (c->alias) {
backend_list = qmp_prepend_backend(backend_list, c->alias);
}
}
return backend_list;
@ -4914,45 +4912,88 @@ void qemu_chr_cleanup(void)
static void register_types(void)
{
register_char_driver("null", CHARDEV_BACKEND_KIND_NULL, NULL,
qemu_chr_open_null);
register_char_driver("socket", CHARDEV_BACKEND_KIND_SOCKET,
qemu_chr_parse_socket, qmp_chardev_open_socket);
register_char_driver("udp", CHARDEV_BACKEND_KIND_UDP, qemu_chr_parse_udp,
qmp_chardev_open_udp);
register_char_driver("ringbuf", CHARDEV_BACKEND_KIND_RINGBUF,
qemu_chr_parse_ringbuf, qemu_chr_open_ringbuf);
register_char_driver("file", CHARDEV_BACKEND_KIND_FILE,
qemu_chr_parse_file_out, qmp_chardev_open_file);
register_char_driver("stdio", CHARDEV_BACKEND_KIND_STDIO,
qemu_chr_parse_stdio, qemu_chr_open_stdio);
int i;
static const CharDriver drivers[] = {
{
.kind = CHARDEV_BACKEND_KIND_NULL,
.create = qemu_chr_open_null,
},
{
.kind = CHARDEV_BACKEND_KIND_SOCKET,
.parse = qemu_chr_parse_socket,
.create = qmp_chardev_open_socket,
},
{
.kind = CHARDEV_BACKEND_KIND_UDP,
.parse = qemu_chr_parse_udp,
.create = qmp_chardev_open_udp,
},
{
.kind = CHARDEV_BACKEND_KIND_RINGBUF,
.parse = qemu_chr_parse_ringbuf,
.create = qemu_chr_open_ringbuf,
},
{
.kind = CHARDEV_BACKEND_KIND_FILE,
.parse = qemu_chr_parse_file_out,
.create = qmp_chardev_open_file,
},
{
.kind = CHARDEV_BACKEND_KIND_STDIO,
.parse = qemu_chr_parse_stdio,
.create = qemu_chr_open_stdio,
},
#if defined HAVE_CHARDEV_SERIAL
register_char_driver("serial", CHARDEV_BACKEND_KIND_SERIAL,
qemu_chr_parse_serial, qmp_chardev_open_serial);
register_char_driver("tty", CHARDEV_BACKEND_KIND_SERIAL,
qemu_chr_parse_serial, qmp_chardev_open_serial);
{
.kind = CHARDEV_BACKEND_KIND_SERIAL,
.alias = "tty",
.parse = qemu_chr_parse_serial,
.create = qmp_chardev_open_serial,
},
#endif
#ifdef HAVE_CHARDEV_PARPORT
register_char_driver("parallel", CHARDEV_BACKEND_KIND_PARALLEL,
qemu_chr_parse_parallel, qmp_chardev_open_parallel);
register_char_driver("parport", CHARDEV_BACKEND_KIND_PARALLEL,
qemu_chr_parse_parallel, qmp_chardev_open_parallel);
{
.kind = CHARDEV_BACKEND_KIND_PARALLEL,
.alias = "parport",
.parse = qemu_chr_parse_parallel,
.create = qmp_chardev_open_parallel,
},
#endif
#ifdef HAVE_CHARDEV_PTY
register_char_driver("pty", CHARDEV_BACKEND_KIND_PTY, NULL,
qemu_chr_open_pty);
{
.kind = CHARDEV_BACKEND_KIND_PTY,
.create = qemu_chr_open_pty,
},
#endif
#ifdef _WIN32
register_char_driver("console", CHARDEV_BACKEND_KIND_CONSOLE, NULL,
qemu_chr_open_win_con);
{
.kind = CHARDEV_BACKEND_KIND_CONSOLE,
.create = qemu_chr_open_win_con,
},
#endif
register_char_driver("pipe", CHARDEV_BACKEND_KIND_PIPE,
qemu_chr_parse_pipe, qemu_chr_open_pipe);
register_char_driver("mux", CHARDEV_BACKEND_KIND_MUX, qemu_chr_parse_mux,
qemu_chr_open_mux);
/* Bug-compatibility: */
register_char_driver("memory", CHARDEV_BACKEND_KIND_MEMORY,
qemu_chr_parse_ringbuf, qemu_chr_open_ringbuf);
{
.kind = CHARDEV_BACKEND_KIND_PIPE,
.parse = qemu_chr_parse_pipe,
.create = qemu_chr_open_pipe,
},
{
.kind = CHARDEV_BACKEND_KIND_MUX,
.parse = qemu_chr_parse_mux,
.create = qemu_chr_open_mux,
},
/* Bug-compatibility: */
{
.kind = CHARDEV_BACKEND_KIND_MEMORY,
.parse = qemu_chr_parse_ringbuf,
.create = qemu_chr_open_ringbuf,
},
};
for (i = 0; i < ARRAY_SIZE(drivers); i++) {
register_char_driver(&drivers[i]);
}
/* this must be done after machine init, since we register FEs with muxes
* as part of realize functions like serial_isa_realizefn when -nographic
* is specified