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authorLennart Poettering <lennart@poettering.net>2010-07-08 21:01:42 +0200
committerLennart Poettering <lennart@poettering.net>2010-07-08 21:01:42 +0200
commitfa776d8e962da9d90459e2f3e86a2a0c6366ee12 (patch)
treec75cc3cb9343a53d55741983c317ee8d414f8f0a /src/cgroup-show.c
parentab35fb1bc68625c891a19a66473a9c40ca12e69d (diff)
cgls: beef up control group dumping and introduce cgls tool
Diffstat (limited to 'src/cgroup-show.c')
-rw-r--r--src/cgroup-show.c172
1 files changed, 150 insertions, 22 deletions
diff --git a/src/cgroup-show.c b/src/cgroup-show.c
index b637c1c163..b44180e1fb 100644
--- a/src/cgroup-show.c
+++ b/src/cgroup-show.c
@@ -21,6 +21,8 @@
#include <stdio.h>
#include <string.h>
+#include <dirent.h>
+#include <errno.h>
#include "util.h"
#include "macro.h"
@@ -36,25 +38,57 @@ static int compare(const void *a, const void *b) {
return 0;
}
-void show_cgroup(const char *name, const char *prefix, unsigned columns) {
+static char *get_cgroup_path(const char *name) {
+
+ if (startswith(name, "name=systemd:"))
+ name += 13;
+
+ if (path_startswith(name, "/cgroup"))
+ return strdup(name);
+
+ return strappend("/cgroup/systemd/", name);
+}
+
+static unsigned ilog10(unsigned long ul) {
+ int n = 0;
+
+ while (ul > 0) {
+ n++;
+ ul /= 10;
+ }
+
+ return n;
+}
+
+static int show_cgroup_full(const char *name, const char *prefix, unsigned n_columns, bool more) {
char *fn;
FILE *f;
size_t n = 0, n_allocated = 0;
pid_t *pids = NULL;
+ char *p;
+ int r;
+ unsigned long biggest = 0;
- if (!startswith(name, "name=systemd:"))
- return;
+ if (n_columns <= 0)
+ n_columns = columns();
- if (asprintf(&fn, "/cgroup/systemd/%s/cgroup.procs", name + 13) < 0) {
- log_error("Out of memory");
- return;
- }
+ if (!prefix)
+ prefix = "";
+
+ if (!(p = get_cgroup_path(name)))
+ return -ENOMEM;
- f = fopen(fn, "r");
+ r = asprintf(&fn, "%s/cgroup.procs", p);
+ free(p);
+
+ if (r < 0)
+ return -ENOMEM;
+
+ f = fopen(fn, "re");
free(fn);
if (!f)
- return;
+ return -errno;
while (!feof(f)) {
unsigned long ul;
@@ -71,7 +105,7 @@ void show_cgroup(const char *name, const char *prefix, unsigned columns) {
n_allocated = MAX(16U, n*2U);
if (!(npids = realloc(pids, sizeof(pid_t) * n_allocated))) {
- log_error("Out of memory");
+ r = -ENOMEM;
goto finish;
}
@@ -80,6 +114,9 @@ void show_cgroup(const char *name, const char *prefix, unsigned columns) {
assert(n < n_allocated);
pids[n++] = (pid_t) ul;
+
+ if (ul > biggest)
+ biggest = ul;
}
if (n > 0) {
@@ -102,33 +139,124 @@ void show_cgroup(const char *name, const char *prefix, unsigned columns) {
/* And sort */
qsort(pids, n, sizeof(pid_t), compare);
- if (!prefix)
- prefix = "";
-
- if (columns > 8)
- columns -= 8;
+ if (n_columns > 8)
+ n_columns -= 8;
else
- columns = 20;
-
- printf("%s\342\224\202\n", prefix);
+ n_columns = 20;
for (i = 0; i < n; i++) {
char *t = NULL;
- get_process_cmdline(pids[i], columns, &t);
+ get_process_cmdline(pids[i], n_columns, &t);
- printf("%s%s %5lu %s\n",
+ printf("%s%s %*lu %s\n",
prefix,
- i < n-1 ? "\342\224\234" : "\342\224\224",
- (unsigned long) pids[i], strna(t));
+ (more || i < n-1) ? "\342\224\234" : "\342\224\224",
+ ilog10(biggest),
+ (unsigned long) pids[i],
+ strna(t));
free(t);
}
}
+ r = 0;
+
finish:
free(pids);
if (f)
fclose(f);
+
+ return r;
+}
+
+int show_cgroup(const char *name, const char *prefix, unsigned n_columns) {
+ return show_cgroup_full(name, prefix, n_columns, false);
+}
+
+int show_cgroup_recursive(const char *name, const char *prefix, unsigned n_columns) {
+ DIR *d;
+ char *last = NULL;
+ char *p1 = NULL, *p2 = NULL, *fn = NULL;
+ struct dirent *de;
+ bool shown_pids = false;
+ int r;
+
+ assert(name);
+
+ if (n_columns <= 0)
+ n_columns = columns();
+
+ if (!prefix)
+ prefix = "";
+
+ if (!(fn = get_cgroup_path(name)))
+ return -ENOMEM;
+
+ if (!(d = opendir(fn))) {
+ free(fn);
+ return -errno;
+ }
+
+ while ((de = readdir(d))) {
+
+ if (de->d_type != DT_DIR)
+ continue;
+
+ if (ignore_file(de->d_name))
+ continue;
+
+ if (!shown_pids) {
+ show_cgroup_full(name, prefix, n_columns, true);
+ shown_pids = true;
+ }
+
+ if (last) {
+ printf("%s\342\224\234 %s\n", prefix, file_name_from_path(last));
+
+ if (!p1)
+ if (!(p1 = strappend(prefix, "\342\224\202 "))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ show_cgroup_recursive(last, p1, n_columns-2);
+
+ free(last);
+ last = NULL;
+ }
+
+ if (asprintf(&last, "%s/%s", name, de->d_name) < 0) {
+ log_error("Out of memory");
+ goto finish;
+ }
+ }
+
+ if (!shown_pids)
+ show_cgroup_full(name, prefix, n_columns, !!last);
+
+ if (last) {
+ printf("%s\342\224\224 %s\n", prefix, file_name_from_path(last));
+
+ if (!p2)
+ if (!(p2 = strappend(prefix, " "))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ show_cgroup_recursive(last, p2, n_columns-2);
+ }
+
+ r = 0;
+
+finish:
+ free(p1);
+ free(p2);
+ free(last);
+ free(fn);
+
+ closedir(d);
+
+ return r;
}