core: rework how we flush incoming traffic when a socket unit goes down

[elogind.git] / src / basic / cgroup-util.c

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 85bbc670397dc14ce098bdb5588b7158240820f7..65909f9ef3b3220329bd4dc0ca6800a6d46e7724 100644 (file)
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
 /***
   This file is part of systemd.
 
@@ -22,23 +20,29 @@
 #include <dirent.h>
 #include <errno.h>
 #include <ftw.h>
+//#include <limits.h>
 #include <signal.h>
+//#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
+//#include <sys/statfs.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "alloc-util.h"
 #include "cgroup-util.h"
+//#include "def.h"
 #include "dirent-util.h"
 #include "extract-word.h"
 #include "fd-util.h"
 #include "fileio.h"
 #include "formats-util.h"
 #include "fs-util.h"
+//#include "log.h"
 #include "login-util.h"
 #include "macro.h"
+//#include "missing.h"
 #include "mkdir.h"
 #include "parse-util.h"
 #include "path-util.h"
@@ -47,11 +51,11 @@
 #include "set.h"
 //#include "special.h"
 #include "stat-util.h"
+#include "stdio-util.h"
 #include "string-table.h"
 #include "string-util.h"
 #include "unit-name.h"
 #include "user-util.h"
-#include "util.h"
 
 int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
         _cleanup_free_ char *fs = NULL;
@@ -87,7 +91,7 @@ int cg_read_pid(FILE *f, pid_t *_pid) {
                 if (feof(f))
                         return 0;
 
-                return errno ? -errno : -EIO;
+                return errno > 0 ? -errno : -EIO;
         }
 
         if (ul <= 0)
@@ -97,6 +101,39 @@ int cg_read_pid(FILE *f, pid_t *_pid) {
         return 1;
 }
 
+int cg_read_event(const char *controller, const char *path, const char *event,
+                  char **val)
+{
+        _cleanup_free_ char *events = NULL, *content = NULL;
+        char *p, *line;
+        int r;
+
+        r = cg_get_path(controller, path, "cgroup.events", &events);
+        if (r < 0)
+                return r;
+
+        r = read_full_file(events, &content, NULL);
+        if (r < 0)
+                return r;
+
+        p = content;
+        while ((line = strsep(&p, "\n"))) {
+                char *key;
+
+                key = strsep(&line, " ");
+                if (!key || !line)
+                        return -EINVAL;
+
+                if (strcmp(key, event))
+                        continue;
+
+                *val = strdup(line);
+                return 0;
+        }
+
+        return -ENOENT;
+}
+
 int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
         _cleanup_free_ char *fs = NULL;
         int r;
@@ -557,7 +594,6 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
                 r = join_path_unified(path, suffix, fs);
         else
                 r = join_path_legacy(controller, path, suffix, fs);
-
         if (r < 0)
                 return r;
 
@@ -647,7 +683,7 @@ int cg_trim(const char *controller, const char *path, bool delete_root) {
         if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) {
                 if (errno == ENOENT)
                         r = 0;
-                else if (errno != 0)
+                else if (errno > 0)
                         r = -errno;
                 else
                         r = -EIO;
@@ -716,7 +752,7 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
         if (pid == 0)
                 pid = getpid();
 
-        snprintf(c, sizeof(c), PID_FMT"\n", pid);
+        xsprintf(c, PID_FMT "\n", pid);
 
         return write_string_file(fs, c, 0);
 }
@@ -1013,18 +1049,12 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
                 return unified;
 
         if (unified > 0) {
-                _cleanup_free_ char *populated = NULL, *t = NULL;
+                _cleanup_free_ char *t = NULL;
 
                 /* On the unified hierarchy we can check empty state
-                 * via the "cgroup.populated" attribute. */
-
-                r = cg_get_path(controller, path, "cgroup.populated", &populated);
-                if (r < 0)
-                        return r;
+                 * via the "populated" attribute of "cgroup.events". */
 
-                r = read_one_line_file(populated, &t);
-                if (r == -ENOENT)
-                        return 1;
+                r = cg_read_event(controller, path, "populated", &t);
                 if (r < 0)
                         return r;
 
@@ -2135,7 +2165,7 @@ int cg_kernel_controllers(Set *controllers) {
                         if (feof(f))
                                 break;
 
-                        if (ferror(f) && errno != 0)
+                        if (ferror(f) && errno > 0)
                                 return -errno;
 
                         return -EBADMSG;
@@ -2333,7 +2363,6 @@ static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
         [CGROUP_CONTROLLER_MEMORY] = "memory",
         [CGROUP_CONTROLLER_DEVICES] = "devices",
         [CGROUP_CONTROLLER_PIDS] = "pids",
-        [CGROUP_CONTROLLER_NET_CLS] = "net_cls",
 };
 
 DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);