4ad490007b
Replace the very generic cgroup hookup with a much simpler one. With this change only the high-level cgroup settings remain, the ability to set arbitrary cgroup attributes is removed, so is support for adding units to arbitrary cgroup controllers or setting arbitrary paths for them (especially paths that are different for the various controllers). This also introduces a new -.slice root slice, that is the parent of system.slice and friends. This enables easy admin configuration of root-level cgrouo properties. This replaces DeviceDeny= by DevicePolicy=, and implicitly adds in /dev/null, /dev/zero and friends if DeviceAllow= is used (unless this is turned off by DevicePolicy=).
300 lines
8.8 KiB
C
300 lines
8.8 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdio.h>
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#include <string.h>
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#include <dirent.h>
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#include <errno.h>
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#include "util.h"
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#include "macro.h"
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#include "path-util.h"
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#include "cgroup-util.h"
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#include "cgroup-show.h"
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static int compare(const void *a, const void *b) {
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const pid_t *p = a, *q = b;
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if (*p < *q)
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return -1;
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if (*p > *q)
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return 1;
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return 0;
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}
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static void show_pid_array(int pids[], unsigned n_pids, const char *prefix, unsigned n_columns, bool extra, bool more, bool kernel_threads, OutputFlags flags) {
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unsigned i, m, pid_width;
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pid_t biggest = 0;
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/* Filter duplicates */
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m = 0;
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for (i = 0; i < n_pids; i++) {
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unsigned j;
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if (pids[i] > biggest)
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biggest = pids[i];
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for (j = i+1; j < n_pids; j++)
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if (pids[i] == pids[j])
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break;
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if (j >= n_pids)
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pids[m++] = pids[i];
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}
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n_pids = m;
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pid_width = DECIMAL_STR_WIDTH(biggest);
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/* And sort */
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qsort(pids, n_pids, sizeof(pid_t), compare);
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if(flags & OUTPUT_FULL_WIDTH)
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n_columns = 0;
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else {
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if (n_columns > pid_width+2)
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n_columns -= pid_width+2;
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else
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n_columns = 20;
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}
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for (i = 0; i < n_pids; i++) {
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char *t = NULL;
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get_process_cmdline(pids[i], n_columns, true, &t);
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printf("%s%s%*lu %s\n",
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prefix,
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draw_special_char(extra ? DRAW_TRIANGULAR_BULLET :
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((more || i < n_pids-1) ? DRAW_TREE_BRANCH : DRAW_TREE_RIGHT)),
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pid_width,
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(unsigned long) pids[i],
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strna(t));
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free(t);
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}
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}
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static int show_cgroup_one_by_path(const char *path, const char *prefix, unsigned n_columns, bool more, bool kernel_threads, OutputFlags flags) {
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char *fn;
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_cleanup_fclose_ FILE *f = NULL;
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size_t n = 0, n_allocated = 0;
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_cleanup_free_ pid_t *pids = NULL;
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char *p = NULL;
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pid_t pid;
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int r;
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r = cg_mangle_path(path, &p);
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if (r < 0)
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return r;
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fn = strappend(p, "/cgroup.procs");
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free(p);
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if (!fn)
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return -ENOMEM;
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f = fopen(fn, "re");
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free(fn);
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if (!f)
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return -errno;
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while ((r = cg_read_pid(f, &pid)) > 0) {
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if (!kernel_threads && is_kernel_thread(pid) > 0)
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continue;
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if (n >= n_allocated) {
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pid_t *npids;
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n_allocated = MAX(16U, n*2U);
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npids = realloc(pids, sizeof(pid_t) * n_allocated);
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if (!npids)
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return -ENOMEM;
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pids = npids;
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}
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assert(n < n_allocated);
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pids[n++] = pid;
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}
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if (r < 0)
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return r;
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if (n > 0)
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show_pid_array(pids, n, prefix, n_columns, false, more, kernel_threads, flags);
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return 0;
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}
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int show_cgroup_by_path(const char *path, const char *prefix, unsigned n_columns, bool kernel_threads, OutputFlags flags) {
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_cleanup_free_ char *fn = NULL, *p1 = NULL, *last = NULL, *p2 = NULL;
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_cleanup_closedir_ DIR *d = NULL;
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char *gn = NULL;
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bool shown_pids = false;
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int r;
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assert(path);
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if (n_columns <= 0)
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n_columns = columns();
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if (!prefix)
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prefix = "";
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r = cg_mangle_path(path, &fn);
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if (r < 0)
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return r;
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d = opendir(fn);
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if (!d)
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return -errno;
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while ((r = cg_read_subgroup(d, &gn)) > 0) {
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_cleanup_free_ char *k = NULL;
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k = strjoin(fn, "/", gn, NULL);
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free(gn);
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if (!k)
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return -ENOMEM;
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if (!(flags & OUTPUT_SHOW_ALL) && cg_is_empty_recursive(NULL, k, false) > 0)
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continue;
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if (!shown_pids) {
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show_cgroup_one_by_path(path, prefix, n_columns, true, kernel_threads, flags);
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shown_pids = true;
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}
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if (last) {
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printf("%s%s%s\n", prefix, draw_special_char(DRAW_TREE_BRANCH),
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path_get_file_name(last));
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if (!p1) {
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p1 = strappend(prefix, draw_special_char(DRAW_TREE_VERT));
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if (!p1)
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return -ENOMEM;
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}
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show_cgroup_by_path(last, p1, n_columns-2, kernel_threads, flags);
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free(last);
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}
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last = k;
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k = NULL;
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}
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if (r < 0)
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return r;
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if (!shown_pids)
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show_cgroup_one_by_path(path, prefix, n_columns, !!last, kernel_threads, flags);
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if (last) {
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printf("%s%s%s\n", prefix, draw_special_char(DRAW_TREE_RIGHT),
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path_get_file_name(last));
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if (!p2) {
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p2 = strappend(prefix, " ");
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if (!p2)
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return -ENOMEM;
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}
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show_cgroup_by_path(last, p2, n_columns-2, kernel_threads, flags);
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}
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return 0;
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}
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int show_cgroup(const char *controller, const char *path, const char *prefix, unsigned n_columns, bool kernel_threads, OutputFlags flags) {
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_cleanup_free_ char *p = NULL;
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int r;
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assert(path);
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r = cg_get_path(controller, path, NULL, &p);
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if (r < 0)
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return r;
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return show_cgroup_by_path(p, prefix, n_columns, kernel_threads, flags);
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}
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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) {
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_cleanup_free_ pid_t *copy = NULL;
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unsigned i, j;
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int r;
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assert(path);
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if (n_pids <= 0)
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return 0;
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if (n_columns <= 0)
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n_columns = columns();
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prefix = strempty(prefix);
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copy = new(pid_t, n_pids);
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if (!copy)
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return -ENOMEM;
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for (i = 0, j = 0; i < n_pids; i++) {
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_cleanup_free_ char *k = NULL;
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r = cg_pid_get_path(controller, pids[i], &k);
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if (r < 0)
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return r;
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if (path_startswith(k, path))
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continue;
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copy[j++] = pids[i];
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}
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show_pid_array(copy, j, prefix, n_columns, true, false, false, flags);
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return 0;
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}
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int show_cgroup_and_extra(const char *controller, const char *path, const char *prefix, unsigned n_columns, bool kernel_threads, const pid_t extra_pids[], unsigned n_extra_pids, OutputFlags flags) {
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int r;
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assert(path);
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r = show_cgroup(controller, path, prefix, n_columns, kernel_threads, flags);
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if (r < 0)
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return r;
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return show_extra_pids(controller, path, prefix, n_columns, extra_pids, n_extra_pids, flags);
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}
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int show_cgroup_and_extra_by_spec(const char *spec, const char *prefix, unsigned n_columns, bool kernel_threads, const pid_t extra_pids[], unsigned n_extra_pids, OutputFlags flags) {
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_cleanup_free_ char *controller = NULL, *path = NULL;
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int r;
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assert(spec);
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r = cg_split_spec(spec, &controller, &path);
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if (r < 0)
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return r;
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return show_cgroup_and_extra(controller, path, prefix, n_columns, kernel_threads, extra_pids, n_extra_pids, flags);
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}
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