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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <dirent.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "cgroup-show.h"
#include "cgroup-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "locale-util.h"
#include "macro.h"
#include "output-mode.h"
#include "path-util.h"
#include "process-util.h"
#include "string-util.h"
#include "terminal-util.h"
#include "unit-name.h"
static void show_pid_array(
pid_t pids[],
unsigned n_pids,
const char *prefix,
unsigned n_columns,
bool extra,
bool more,
OutputFlags flags) {
unsigned i, j, pid_width;
if (n_pids == 0)
return;
typesafe_qsort(pids, n_pids, pid_compare_func);
/* Filter duplicates */
for (j = 0, i = 1; i < n_pids; i++) {
if (pids[i] == pids[j])
continue;
pids[++j] = pids[i];
}
n_pids = j + 1;
pid_width = DECIMAL_STR_WIDTH(pids[j]);
if (flags & OUTPUT_FULL_WIDTH)
n_columns = 0;
else {
if (n_columns > pid_width+2)
n_columns -= pid_width+2;
else
n_columns = 20;
}
for (i = 0; i < n_pids; i++) {
_cleanup_free_ char *t = NULL;
(void) get_process_cmdline(pids[i], n_columns, true, &t);
if (extra)
printf("%s%s ", prefix, special_glyph(TRIANGULAR_BULLET));
else
printf("%s%s", prefix, special_glyph(((more || i < n_pids-1) ? TREE_BRANCH : TREE_RIGHT)));
printf("%*"PID_PRI" %s\n", pid_width, pids[i], strna(t));
}
}
static int show_cgroup_one_by_path(
const char *path,
const char *prefix,
unsigned n_columns,
bool more,
OutputFlags flags) {
char *fn;
_cleanup_fclose_ FILE *f = NULL;
size_t n = 0, n_allocated = 0;
_cleanup_free_ pid_t *pids = NULL;
_cleanup_free_ char *p = NULL;
pid_t pid;
int r;
r = cg_mangle_path(path, &p);
if (r < 0)
return r;
fn = strjoina(p, "/cgroup.procs");
f = fopen(fn, "re");
if (!f)
return -errno;
while ((r = cg_read_pid(f, &pid)) > 0) {
if (!(flags & OUTPUT_KERNEL_THREADS) && is_kernel_thread(pid) > 0)
continue;
if (!GREEDY_REALLOC(pids, n_allocated, n + 1))
return -ENOMEM;
assert(n < n_allocated);
pids[n++] = pid;
}
if (r < 0)
return r;
show_pid_array(pids, n, prefix, n_columns, false, more, flags);
return 0;
}
int show_cgroup_by_path(
const char *path,
const char *prefix,
unsigned n_columns,
OutputFlags flags) {
_cleanup_free_ char *fn = NULL, *p1 = NULL, *last = NULL, *p2 = NULL;
_cleanup_closedir_ DIR *d = NULL;
char *gn = NULL;
bool shown_pids = false;
int r;
assert(path);
if (n_columns <= 0)
n_columns = columns();
prefix = strempty(prefix);
r = cg_mangle_path(path, &fn);
if (r < 0)
return r;
d = opendir(fn);
if (!d)
return -errno;
while ((r = cg_read_subgroup(d, &gn)) > 0) {
_cleanup_free_ char *k = NULL;
k = strjoin(fn, "/", gn);
free(gn);
if (!k)
return -ENOMEM;
if (!(flags & OUTPUT_SHOW_ALL) && cg_is_empty_recursive(NULL, k) > 0)
continue;
if (!shown_pids) {
show_cgroup_one_by_path(path, prefix, n_columns, true, flags);
shown_pids = true;
}
if (last) {
printf("%s%s%s\n", prefix, special_glyph(TREE_BRANCH), cg_unescape(basename(last)));
if (!p1) {
p1 = strappend(prefix, special_glyph(TREE_VERTICAL));
if (!p1)
return -ENOMEM;
}
show_cgroup_by_path(last, p1, n_columns-2, flags);
free(last);
}
last = TAKE_PTR(k);
}
if (r < 0)
return r;
if (!shown_pids)
show_cgroup_one_by_path(path, prefix, n_columns, !!last, flags);
if (last) {
printf("%s%s%s\n", prefix, special_glyph(TREE_RIGHT), cg_unescape(basename(last)));
if (!p2) {
p2 = strappend(prefix, " ");
if (!p2)
return -ENOMEM;
}
show_cgroup_by_path(last, p2, n_columns-2, flags);
}
return 0;
}
int show_cgroup(const char *controller,
const char *path,
const char *prefix,
unsigned n_columns,
OutputFlags flags) {
_cleanup_free_ char *p = NULL;
int r;
assert(path);
r = cg_get_path(controller, path, NULL, &p);
if (r < 0)
return r;
return show_cgroup_by_path(p, prefix, n_columns, flags);
}
static int show_extra_pids(
const char *controller,
const char *path,
const char *prefix,
unsigned n_columns,
const pid_t pids[],
unsigned n_pids,
OutputFlags flags) {
_cleanup_free_ pid_t *copy = NULL;
unsigned i, j;
int r;
assert(path);
if (n_pids <= 0)
return 0;
if (n_columns <= 0)
n_columns = columns();
prefix = strempty(prefix);
copy = new(pid_t, n_pids);
if (!copy)
return -ENOMEM;
for (i = 0, j = 0; i < n_pids; i++) {
_cleanup_free_ char *k = NULL;
r = cg_pid_get_path(controller, pids[i], &k);
if (r < 0)
return r;
if (path_startswith(k, path))
continue;
copy[j++] = pids[i];
}
show_pid_array(copy, j, prefix, n_columns, true, false, flags);
return 0;
}
int show_cgroup_and_extra(
const char *controller,
const char *path,
const char *prefix,
unsigned n_columns,
const pid_t extra_pids[],
unsigned n_extra_pids,
OutputFlags flags) {
int r;
assert(path);
r = show_cgroup(controller, path, prefix, n_columns, flags);
if (r < 0)
return r;
return show_extra_pids(controller, path, prefix, n_columns, extra_pids, n_extra_pids, flags);
}
int show_cgroup_and_extra_by_spec(
const char *spec,
const char *prefix,
unsigned n_columns,
const pid_t extra_pids[],
unsigned n_extra_pids,
OutputFlags flags) {
_cleanup_free_ char *controller = NULL, *path = NULL;
int r;
assert(spec);
r = cg_split_spec(spec, &controller, &path);
if (r < 0)
return r;
return show_cgroup_and_extra(controller, path, prefix, n_columns, extra_pids, n_extra_pids, flags);
}
int show_cgroup_get_unit_path_and_warn(
sd_bus *bus,
const char *unit,
char **ret) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_free_ char *path = NULL;
int r;
path = unit_dbus_path_from_name(unit);
if (!path)
return log_oom();
r = sd_bus_get_property_string(
bus,
"org.freedesktop.systemd1",
path,
unit_dbus_interface_from_name(unit),
"ControlGroup",
&error,
ret);
if (r < 0)
return log_error_errno(r, "Failed to query unit control group path: %s",
bus_error_message(&error, r));
return 0;
}
int show_cgroup_get_path_and_warn(
const char *machine,
const char *prefix,
char **ret) {
int r;
_cleanup_free_ char *root = NULL;
if (machine) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
_cleanup_free_ char *unit = NULL;
const char *m;
m = strjoina("/run/systemd/machines/", machine);
r = parse_env_file(NULL, m, NEWLINE, "SCOPE", &unit, NULL);
if (r < 0)
return log_error_errno(r, "Failed to load machine data: %m");
r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL, false, &bus);
if (r < 0)
return log_error_errno(r, "Failed to create bus connection: %m");
r = show_cgroup_get_unit_path_and_warn(bus, unit, &root);
if (r < 0)
return r;
} else {
r = cg_get_root_path(&root);
if (r == -ENOMEDIUM)
return log_error_errno(r, "Failed to get root control group path.\n"
"No cgroup filesystem mounted on /sys/fs/cgroup");
else if (r < 0)
return log_error_errno(r, "Failed to get root control group path: %m");
}
if (prefix) {
char *t;
t = strjoin(root, prefix);
if (!t)
return log_oom();
*ret = t;
} else
*ret = TAKE_PTR(root);
return 0;
}
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