Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 354 insertions, 0 deletions

diff --git a/src/shared/cgroup-show.c b/src/shared/cgroup-show.c
new file mode 100644
index 0000000..61df751
--- /dev/null
+++ b/src/shared/cgroup-show.c
@@ -0,0 +1,354 @@
+/* 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 "env-file.h"
+#include "fd-util.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(SPECIAL_GLYPH_TRIANGULAR_BULLET));
+                else
+                        printf("%s%s", prefix, special_glyph(((more || i < n_pids-1) ? SPECIAL_GLYPH_TREE_BRANCH : SPECIAL_GLYPH_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(SPECIAL_GLYPH_TREE_BRANCH), cg_unescape(basename(last)));
+
+                        if (!p1) {
+                                p1 = strappend(prefix, special_glyph(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(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_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, "SCOPE", &unit);
+                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;
+}