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busctl: introduce 'emit' command to emit a signal

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Closes #11622.
This commit is contained in:
Yu Watanabe 2019-02-02 18:01:05 +01:00
parent 9ecb11f55d
commit 143aea3813
2 changed files with 73 additions and 1 deletions
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20
man/busctl.xml
View File

@ -187,7 +187,7 @@
<term><option>--auto-start=</option><replaceable>BOOL</replaceable></term>
<listitem>
<para>When used with the <command>call</command> command, specifies
<para>When used with the <command>call</command> or <command>emit</command> command, specifies
whether the method call should implicitly activate the
called service, should it not be running yet but is
configured to be auto-started. Defaults to
@ -247,6 +247,15 @@
</listitem>
</varlistentry>
<varlistentry>
<term><option>--destination=</option><replaceable>SERVICE</replaceable></term>
<listitem>
<para>Takes a service name. When used with the <command>emit</command> command, a signal is
emitted to the specified service.</para>
</listitem>
</varlistentry>
<xi:include href="user-system-options.xml" xpointer="user" />
<xi:include href="user-system-options.xml" xpointer="system" />
<xi:include href="user-system-options.xml" xpointer="host" />
@ -341,6 +350,15 @@
<option>--quiet</option> option.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>emit</command> <arg choice="plain"><replaceable>OBJECT</replaceable></arg> <arg choice="plain"><replaceable>INTERFACE</replaceable></arg> <arg choice="plain"><replaceable>SIGNAL</replaceable></arg> <arg choice="opt"><replaceable>SIGNATURE</replaceable> <arg choice="opt" rep="repeat"><replaceable>ARGUMENT</replaceable></arg></arg></term>
<listitem><para>Emit a signal. Takes a object path, interface name and method name. If parameters
shall be passed, a signature string is required, followed by the arguments, individually formatted as
strings. For details on the formatting used, see below. To specify the destination of the signal,
use the <option>--destination=</option> option.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>get-property</command> <arg choice="plain"><replaceable>SERVICE</replaceable></arg> <arg choice="plain"><replaceable>OBJECT</replaceable></arg> <arg choice="plain"><replaceable>INTERFACE</replaceable></arg> <arg choice="plain" rep="repeat"><replaceable>PROPERTY</replaceable></arg></term>

54
src/busctl/busctl.c
View File

@ -57,6 +57,7 @@ static bool arg_allow_interactive_authorization = true;
static bool arg_augment_creds = true;
static bool arg_watch_bind = false;
static usec_t arg_timeout = 0;
static const char *arg_destination = NULL;
STATIC_DESTRUCTOR_REGISTER(arg_matches, strv_freep);
@ -2036,6 +2037,49 @@ static int call(int argc, char **argv, void *userdata) {
return 0;
}
static int emit_signal(int argc, char **argv, void *userdata) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
int r;
r = acquire_bus(false, &bus);
if (r < 0)
return r;
r = sd_bus_message_new_signal(bus, &m, argv[1], argv[2], argv[3]);
if (r < 0)
return bus_log_create_error(r);
if (arg_destination) {
r = sd_bus_message_set_destination(m, arg_destination);
if (r < 0)
return bus_log_create_error(r);
}
r = sd_bus_message_set_auto_start(m, arg_auto_start);
if (r < 0)
return bus_log_create_error(r);
if (!isempty(argv[4])) {
char **p;
p = argv+5;
r = message_append_cmdline(m, argv[4], &p);
if (r < 0)
return r;
if (*p)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Too many parameters for signature.");
}
r = sd_bus_send(bus, m, NULL);
if (r < 0)
return log_error_errno(r, "Failed to send signal: %m");
return 0;
}
static int get_property(int argc, char **argv, void *userdata) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
@ -2182,6 +2226,7 @@ static int help(void) {
" --augment-creds=BOOL Extend credential data with data read from /proc/$PID\n"
" --watch-bind=BOOL Wait for bus AF_UNIX socket to be bound in the file\n"
" system\n"
" --destination=SERVICE Destination service of a signal\n"
"\nCommands:\n"
" list List bus names\n"
" status [SERVICE] Show bus service, process or bus owner credentials\n"
@ -2191,6 +2236,8 @@ static int help(void) {
" introspect SERVICE OBJECT [INTERFACE]\n"
" call SERVICE OBJECT INTERFACE METHOD [SIGNATURE [ARGUMENT...]]\n"
" Call a method\n"
" emit OBJECT INTERFACE SIGNAL [SIGNATURE [ARGUMENT...]]\n"
" Emit a signal\n"
" get-property SERVICE OBJECT INTERFACE PROPERTY...\n"
" Get property value\n"
" set-property SERVICE OBJECT INTERFACE PROPERTY SIGNATURE ARGUMENT...\n"
@ -2232,6 +2279,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_AUGMENT_CREDS,
ARG_WATCH_BIND,
ARG_JSON,
ARG_DESTINATION,
};
static const struct option options[] = {
@ -2260,6 +2308,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "augment-creds", required_argument, NULL, ARG_AUGMENT_CREDS },
{ "watch-bind", required_argument, NULL, ARG_WATCH_BIND },
{ "json", required_argument, NULL, ARG_JSON },
{ "destination", required_argument, NULL, ARG_DESTINATION },
{},
};
@ -2426,6 +2475,10 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_DESTINATION:
arg_destination = optarg;
break;
case '?':
return -EINVAL;
@ -2446,6 +2499,7 @@ static int busctl_main(int argc, char *argv[]) {
{ "tree", VERB_ANY, VERB_ANY, 0, tree },
{ "introspect", 3, 4, 0, introspect },
{ "call", 5, VERB_ANY, 0, call },
{ "emit", 4, VERB_ANY, 0, emit_signal },
{ "get-property", 5, VERB_ANY, 0, get_property },
{ "set-property", 6, VERB_ANY, 0, set_property },
{ "help", VERB_ANY, VERB_ANY, 0, verb_help },