mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-27 03:21:32 +03:00
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <systemd/sd-bus.h>
|
|
#define _cleanup_(f) __attribute__((cleanup(f)))
|
|
|
|
/* This is equivalent to:
|
|
* busctl call org.freedesktop.systemd1 /org/freedesktop/systemd1 \
|
|
* org.freedesktop.systemd1.Manager GetUnitByPID $$
|
|
*
|
|
* Compile with 'cc -lsystemd print-unit-path.c'
|
|
*/
|
|
|
|
#define DESTINATION "org.freedesktop.systemd1"
|
|
#define PATH "/org/freedesktop/systemd1"
|
|
#define INTERFACE "org.freedesktop.systemd1.Manager"
|
|
#define MEMBER "GetUnitByPID"
|
|
|
|
static int log_error(int error, const char *message) {
|
|
fprintf(stderr, "%s: %s\n", message, strerror(-error));
|
|
return error;
|
|
}
|
|
|
|
static int print_unit_path(sd_bus *bus) {
|
|
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
|
|
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
|
|
int r;
|
|
|
|
r = sd_bus_message_new_method_call(bus, &m,
|
|
DESTINATION, PATH, INTERFACE, MEMBER);
|
|
if (r < 0)
|
|
return log_error(r, "Failed to create bus message");
|
|
|
|
r = sd_bus_message_append(m, "u", (unsigned) getpid());
|
|
if (r < 0)
|
|
return log_error(r, "Failed to append to bus message");
|
|
|
|
r = sd_bus_call(bus, m, -1, &error, &reply);
|
|
if (r < 0)
|
|
return log_error(r, "Call failed");
|
|
|
|
const char *ans;
|
|
r = sd_bus_message_read(reply, "o", &ans);
|
|
if (r < 0)
|
|
return log_error(r, "Failed to read reply");
|
|
|
|
printf("Unit path is \"%s\".\n", ans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
|
|
int r;
|
|
|
|
r = sd_bus_open_system(&bus);
|
|
if (r < 0)
|
|
return log_error(r, "Failed to acquire bus");
|
|
|
|
print_unit_path(bus);
|
|
}
|