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authorLennart Poettering <lennart@poettering.net>2016-04-20 15:28:28 +0200
committerLennart Poettering <lennart@poettering.net>2016-04-22 16:06:20 +0200
commit291d565a04263452c03beaf537773ade4f0b1617 (patch)
tree257b4d239c7bbe9daf312a70c6aa5e2c5033ee65 /src/basic
parent2b45d88163b29f04bf784385f4a490b2cf206861 (diff)
core,systemctl: add bus API to retrieve processes of a unit
This adds a new GetProcesses() bus call to the Unit object which returns an array consisting of all PIDs, their process names, as well as their full cgroup paths. This is then used by "systemctl status" to show the per-unit process tree. This has the benefit that the client-side no longer needs to access the cgroupfs directly to show the process tree of a unit. Instead, it now uses this new API, which means it also works if -H or -M are used correctly, as the information from the specific host is used, and not the one from the local system. Fixes: #2945
Diffstat (limited to 'src/basic')
-rw-r--r--src/basic/process-util.c12
-rw-r--r--src/basic/process-util.h2
2 files changed, 14 insertions, 0 deletions
diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index ae3f6109ad..f2cea01979 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -731,6 +731,18 @@ void valgrind_summary_hack(void) {
#endif
}
+int pid_compare_func(const void *a, const void *b) {
+ const pid_t *p = a, *q = b;
+
+ /* Suitable for usage in qsort() */
+
+ if (*p < *q)
+ return -1;
+ if (*p > *q)
+ return 1;
+ return 0;
+}
+
static const char *const ioprio_class_table[] = {
[IOPRIO_CLASS_NONE] = "none",
[IOPRIO_CLASS_RT] = "realtime",
diff --git a/src/basic/process-util.h b/src/basic/process-util.h
index f5d193e762..ffd4bcb0ff 100644
--- a/src/basic/process-util.h
+++ b/src/basic/process-util.h
@@ -101,3 +101,5 @@ int sched_policy_from_string(const char *s);
#define PID_TO_PTR(p) ((void*) ((uintptr_t) p))
void valgrind_summary_hack(void);
+
+int pid_compare_func(const void *a, const void *b);