move more common files to shared/ and add them to shared.la

1 files changed, 261 insertions, 0 deletions

diff --git a/src/shared/cgroup-show.c b/src/shared/cgroup-show.c
new file mode 100644
index 0000000000..550a2f5f31
--- /dev/null
+++ b/src/shared/cgroup-show.c
@@ -0,0 +1,261 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include "util.h"
+#include "macro.h"
+#include "cgroup-util.h"
+#include "cgroup-show.h"
+
+static int compare(const void *a, const void *b) {
+        const pid_t *p = a, *q = b;
+
+        if (*p < *q)
+                return -1;
+        if (*p > *q)
+                return 1;
+        return 0;
+}
+
+static unsigned ilog10(unsigned long ul) {
+        int n = 0;
+
+        while (ul > 0) {
+                n++;
+                ul /= 10;
+        }
+
+        return n;
+}
+
+static int show_cgroup_one_by_path(const char *path, const char *prefix, unsigned n_columns, bool more, bool kernel_threads) {
+        char *fn;
+        FILE *f;
+        size_t n = 0, n_allocated = 0;
+        pid_t *pids = NULL;
+        char *p;
+        pid_t pid, biggest = 0;
+        int r;
+
+        if (n_columns <= 0)
+                n_columns = columns();
+
+        if (!prefix)
+                prefix = "";
+
+        if ((r = cg_fix_path(path, &p)) < 0)
+                return r;
+
+        r = asprintf(&fn, "%s/cgroup.procs", p);
+        free(p);
+
+        if (r < 0)
+                return -ENOMEM;
+
+        f = fopen(fn, "re");
+        free(fn);
+
+        if (!f)
+                return -errno;
+
+        while ((r = cg_read_pid(f, &pid)) > 0) {
+
+                if (!kernel_threads && is_kernel_thread(pid) > 0)
+                        continue;
+
+                if (n >= n_allocated) {
+                        pid_t *npids;
+
+                        n_allocated = MAX(16U, n*2U);
+
+                        if (!(npids = realloc(pids, sizeof(pid_t) * n_allocated))) {
+                                r = -ENOMEM;
+                                goto finish;
+                        }
+
+                        pids = npids;
+                }
+
+                assert(n < n_allocated);
+                pids[n++] = pid;
+
+                if (pid > biggest)
+                        biggest = pid;
+        }
+
+        if (r < 0)
+                goto finish;
+
+        if (n > 0) {
+                unsigned i, m;
+
+                /* Filter duplicates */
+                m = 0;
+                for (i = 0; i < n; i++) {
+                        unsigned j;
+
+                        for (j = i+1; j < n; j++)
+                                if (pids[i] == pids[j])
+                                        break;
+
+                        if (j >= n)
+                                pids[m++] = pids[i];
+                }
+                n = m;
+
+                /* And sort */
+                qsort(pids, n, sizeof(pid_t), compare);
+
+                if (n_columns > 8)
+                        n_columns -= 8;
+                else
+                        n_columns = 20;
+
+                for (i = 0; i < n; i++) {
+                        char *t = NULL;
+
+                        get_process_cmdline(pids[i], n_columns, true, &t);
+
+                        printf("%s%s %*lu %s\n",
+                               prefix,
+                               (more || i < n-1) ? "\342\224\234" : "\342\224\224",
+                               (int) ilog10(biggest),
+                               (unsigned long) pids[i],
+                               strna(t));
+
+                        free(t);
+                }
+        }
+
+        r = 0;
+
+finish:
+        free(pids);
+
+        if (f)
+                fclose(f);
+
+        return r;
+}
+
+int show_cgroup_by_path(const char *path, const char *prefix, unsigned n_columns, bool kernel_threads) {
+        DIR *d;
+        char *last = NULL;
+        char *p1 = NULL, *p2 = NULL, *fn = NULL, *gn = NULL;
+        bool shown_pids = false;
+        int r;
+
+        if (n_columns <= 0)
+                n_columns = columns();
+
+        if (!prefix)
+                prefix = "";
+
+        if ((r = cg_fix_path(path, &fn)) < 0)
+                return r;
+
+        if (!(d = opendir(fn))) {
+                free(fn);
+                return -errno;
+        }
+
+        while ((r = cg_read_subgroup(d, &gn)) > 0) {
+
+                if (!shown_pids) {
+                        show_cgroup_one_by_path(path, prefix, n_columns, true, kernel_threads);
+                        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_by_path(last, p1, n_columns-2, kernel_threads);
+
+                        free(last);
+                        last = NULL;
+                }
+
+                r = asprintf(&last, "%s/%s", fn, gn);
+                free(gn);
+
+                if (r < 0) {
+                        r = -ENOMEM;
+                        goto finish;
+                }
+        }
+
+        if (r < 0)
+                goto finish;
+
+        if (!shown_pids)
+                show_cgroup_one_by_path(path, prefix, n_columns, !!last, kernel_threads);
+
+        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_by_path(last, p2, n_columns-2, kernel_threads);
+        }
+
+        r = 0;
+
+finish:
+        free(p1);
+        free(p2);
+        free(last);
+        free(fn);
+
+        closedir(d);
+
+        return r;
+}
+
+int show_cgroup(const char *controller, const char *path, const char *prefix, unsigned n_columns, bool kernel_threads) {
+        char *p;
+        int r;
+
+        assert(controller);
+        assert(path);
+
+        r = cg_get_path(controller, path, NULL, &p);
+        if (r < 0)
+                return r;
+
+        r = show_cgroup_by_path(p, prefix, n_columns, kernel_threads);
+        free(p);
+
+        return r;
+}