src/shared/cgroup-show.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <dirent.h>
  25 #include <errno.h>
  26
  27 #include "util.h"
  28 #include "macro.h"
  29 #include "path-util.h"
  30 #include "cgroup-util.h"
  31 #include "cgroup-show.h"
  32
  33 static int compare(const void *a, const void *b) {
  34         const pid_t *p = a, *q = b;
  35
  36         if (*p < *q)
  37                 return -1;
  38         if (*p > *q)
  39                 return 1;
  40         return 0;
  41 }
  42
  43 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) {
  44         unsigned i, m, pid_width;
  45         pid_t biggest = 0;
  46
  47         /* Filter duplicates */
  48         m = 0;
  49         for (i = 0; i < n_pids; i++) {
  50                 unsigned j;
  51
  52                 if (pids[i] > biggest)
  53                         biggest = pids[i];
  54
  55                 for (j = i+1; j < n_pids; j++)
  56                         if (pids[i] == pids[j])
  57                                 break;
  58
  59                 if (j >= n_pids)
  60                         pids[m++] = pids[i];
  61         }
  62         n_pids = m;
  63         pid_width = DECIMAL_STR_WIDTH(biggest);
  64
  65         /* And sort */
  66         qsort_safe(pids, n_pids, sizeof(pid_t), compare);
  67
  68         if (flags & OUTPUT_FULL_WIDTH)
  69                 n_columns = 0;
  70         else {
  71                 if (n_columns > pid_width+2)
  72                         n_columns -= pid_width+2;
  73                 else
  74                         n_columns = 20;
  75         }
  76         for (i = 0; i < n_pids; i++) {
  77                 _cleanup_free_ char *t = NULL;
  78
  79                 get_process_cmdline(pids[i], n_columns, true, &t);
  80
  81                 if (extra)
  82                         printf("%s%s ", prefix, draw_special_char(DRAW_TRIANGULAR_BULLET));
  83                 else
  84                         printf("%s%s", prefix, draw_special_char(((more || i < n_pids-1) ? DRAW_TREE_BRANCH : DRAW_TREE_RIGHT)));
  85
  86                 printf("%*lu %s\n",
  87                        pid_width,
  88                        (unsigned long) pids[i],
  89                        strna(t));
  90         }
  91 }
  92
  93
  94 static int show_cgroup_one_by_path(const char *path, const char *prefix, unsigned n_columns, bool more, bool kernel_threads, OutputFlags flags) {
  95         char *fn;
  96         _cleanup_fclose_ FILE *f = NULL;
  97         size_t n = 0, n_allocated = 0;
  98         _cleanup_free_ pid_t *pids = NULL;
  99         _cleanup_free_ char *p = NULL;
 100         pid_t pid;
 101         int r;
 102
 103         r = cg_mangle_path(path, &p);
 104         if (r < 0)
 105                 return r;
 106
 107         fn = strappenda(p, "/cgroup.procs");
 108         f = fopen(fn, "re");
 109         if (!f)
 110                 return -errno;
 111
 112         while ((r = cg_read_pid(f, &pid)) > 0) {
 113
 114                 if (!kernel_threads && is_kernel_thread(pid) > 0)
 115                         continue;
 116
 117                 if (n >= n_allocated) {
 118                         pid_t *npids;
 119
 120                         n_allocated = MAX(16U, n*2U);
 121
 122                         npids = realloc(pids, sizeof(pid_t) * n_allocated);
 123                         if (!npids)
 124                                 return -ENOMEM;
 125
 126                         pids = npids;
 127                 }
 128
 129                 assert(n < n_allocated);
 130                 pids[n++] = pid;
 131         }
 132
 133         if (r < 0)
 134                 return r;
 135
 136         if (n > 0)
 137                 show_pid_array(pids, n, prefix, n_columns, false, more, kernel_threads, flags);
 138
 139         return 0;
 140 }
 141
 142 int show_cgroup_by_path(const char *path, const char *prefix, unsigned n_columns, bool kernel_threads, OutputFlags flags) {
 143         _cleanup_free_ char *fn = NULL, *p1 = NULL, *last = NULL, *p2 = NULL;
 144         _cleanup_closedir_ DIR *d = NULL;
 145         char *gn = NULL;
 146         bool shown_pids = false;
 147         int r;
 148
 149         assert(path);
 150
 151         if (n_columns <= 0)
 152                 n_columns = columns();
 153
 154         if (!prefix)
 155                 prefix = "";
 156
 157         r = cg_mangle_path(path, &fn);
 158         if (r < 0)
 159                 return r;
 160
 161         d = opendir(fn);
 162         if (!d)
 163                 return -errno;
 164
 165         while ((r = cg_read_subgroup(d, &gn)) > 0) {
 166                 _cleanup_free_ char *k = NULL;
 167
 168                 k = strjoin(fn, "/", gn, NULL);
 169                 free(gn);
 170                 if (!k)
 171                         return -ENOMEM;
 172
 173                 if (!(flags & OUTPUT_SHOW_ALL) && cg_is_empty_recursive(NULL, k, false) > 0)
 174                         continue;
 175
 176                 if (!shown_pids) {
 177                         show_cgroup_one_by_path(path, prefix, n_columns, true, kernel_threads, flags);
 178                         shown_pids = true;
 179                 }
 180
 181                 if (last) {
 182                         printf("%s%s%s\n", prefix, draw_special_char(DRAW_TREE_BRANCH),
 183                                            basename(last));
 184
 185                         if (!p1) {
 186                                 p1 = strappend(prefix, draw_special_char(DRAW_TREE_VERTICAL));
 187                                 if (!p1)
 188                                         return -ENOMEM;
 189                         }
 190
 191                         show_cgroup_by_path(last, p1, n_columns-2, kernel_threads, flags);
 192                         free(last);
 193                 }
 194
 195                 last = k;
 196                 k = NULL;
 197         }
 198
 199         if (r < 0)
 200                 return r;
 201
 202         if (!shown_pids)
 203                 show_cgroup_one_by_path(path, prefix, n_columns, !!last, kernel_threads, flags);
 204
 205         if (last) {
 206                 printf("%s%s%s\n", prefix, draw_special_char(DRAW_TREE_RIGHT),
 207                                    basename(last));
 208
 209                 if (!p2) {
 210                         p2 = strappend(prefix, "  ");
 211                         if (!p2)
 212                                 return -ENOMEM;
 213                 }
 214
 215                 show_cgroup_by_path(last, p2, n_columns-2, kernel_threads, flags);
 216         }
 217
 218         return 0;
 219 }
 220
 221 int show_cgroup(const char *controller, const char *path, const char *prefix, unsigned n_columns, bool kernel_threads, OutputFlags flags) {
 222         _cleanup_free_ char *p = NULL;
 223         int r;
 224
 225         assert(path);
 226
 227         r = cg_get_path(controller, path, NULL, &p);
 228         if (r < 0)
 229                 return r;
 230
 231         return show_cgroup_by_path(p, prefix, n_columns, kernel_threads, flags);
 232 }
 233
 234 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) {
 235         _cleanup_free_ pid_t *copy = NULL;
 236         unsigned i, j;
 237         int r;
 238
 239         assert(path);
 240
 241         if (n_pids <= 0)
 242                 return 0;
 243
 244         if (n_columns <= 0)
 245                 n_columns = columns();
 246
 247         prefix = strempty(prefix);
 248
 249         copy = new(pid_t, n_pids);
 250         if (!copy)
 251                 return -ENOMEM;
 252
 253         for (i = 0, j = 0; i < n_pids; i++) {
 254                 _cleanup_free_ char *k = NULL;
 255
 256                 r = cg_pid_get_path(controller, pids[i], &k);
 257                 if (r < 0)
 258                         return r;
 259
 260                 if (path_startswith(k, path))
 261                         continue;
 262
 263                 copy[j++] = pids[i];
 264         }
 265
 266         show_pid_array(copy, j, prefix, n_columns, true, false, false, flags);
 267
 268         return 0;
 269 }
 270
 271 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) {
 272         int r;
 273
 274         assert(path);
 275
 276         r = show_cgroup(controller, path, prefix, n_columns, kernel_threads, flags);
 277         if (r < 0)
 278                 return r;
 279
 280         return show_extra_pids(controller, path, prefix, n_columns, extra_pids, n_extra_pids, flags);
 281 }
 282
 283 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) {
 284         _cleanup_free_ char *controller = NULL, *path = NULL;
 285         int r;
 286
 287         assert(spec);
 288
 289         r = cg_split_spec(spec, &controller, &path);
 290         if (r < 0)
 291                 return r;
 292
 293         return show_cgroup_and_extra(controller, path, prefix, n_columns, kernel_threads, extra_pids, n_extra_pids, flags);
 294 }