]>
Commit | Line | Data |
---|---|---|
ce199d12 LB |
1 | /* SPDX-License-Identifier: MIT-0 */ |
2 | ||
3 | /* This is equivalent to: | |
4 | * busctl call org.freedesktop.systemd1 /org/freedesktop/systemd1 \ | |
5 | * org.freedesktop.systemd1.Manager GetUnitByPID $$ | |
6 | * | |
7 | * Compile with 'cc print-unit-path-call-method.c -lsystemd' | |
8 | */ | |
9 | ||
10 | #include <errno.h> | |
11 | #include <stdio.h> | |
12 | #include <sys/types.h> | |
13 | #include <unistd.h> | |
14 | ||
15 | #include <systemd/sd-bus.h> | |
16 | ||
17 | #define _cleanup_(f) __attribute__((cleanup(f))) | |
18 | #define DESTINATION "org.freedesktop.systemd1" | |
19 | #define PATH "/org/freedesktop/systemd1" | |
20 | #define INTERFACE "org.freedesktop.systemd1.Manager" | |
21 | #define MEMBER "GetUnitByPID" | |
22 | ||
23 | static int log_error(int error, const char *message) { | |
e84f70e1 | 24 | fprintf(stderr, "%s: %s\n", message, strerror(-error)); |
ce199d12 LB |
25 | return error; |
26 | } | |
27 | ||
28 | int main(int argc, char **argv) { | |
29 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
30 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
31 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; | |
32 | int r; | |
33 | ||
34 | r = sd_bus_open_system(&bus); | |
35 | if (r < 0) | |
36 | return log_error(r, "Failed to acquire bus"); | |
37 | ||
38 | r = sd_bus_call_method(bus, DESTINATION, PATH, INTERFACE, MEMBER, &error, &reply, "u", (unsigned) getpid()); | |
39 | if (r < 0) | |
40 | return log_error(r, MEMBER " call failed"); | |
41 | ||
42 | const char *ans; | |
43 | r = sd_bus_message_read(reply, "o", &ans); | |
44 | if (r < 0) | |
45 | return log_error(r, "Failed to read reply"); | |
46 | ||
47 | printf("Unit path is \"%s\".\n", ans); | |
48 | ||
49 | return 0; | |
50 | } |