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authorSven Eden <yamakuzure@gmx.net>2017-07-17 15:03:10 +0200
committerSven Eden <yamakuzure@gmx.net>2017-07-17 17:58:43 +0200
commit1981059eaccd58a641074a7c78c0dcec52eabfb2 (patch)
tree58a7298d7f59dcd1620f0e0dda8c632390616e5b /src/shared/nsflags.c
parent8663dfee3cb8d22899105729180d446cb48cfc5c (diff)
Prep v233: Add missing files from upstream and rename formats-util.[hc]
Some functionality has been exported to the following files: - src/basic/env-util.[hc] - src/basic/exec-util.[hc] - src/shared/nsflags.[hc] The content of these files is now needed in elogind, and the files have been added as-is. Cleanup is done later. Further the header src/basic/formats-util.h has been renamed to src/basic/format-util.h
Diffstat (limited to 'src/shared/nsflags.c')
-rw-r--r--src/shared/nsflags.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/src/shared/nsflags.c b/src/shared/nsflags.c
new file mode 100644
index 000000000..aeb79b131
--- /dev/null
+++ b/src/shared/nsflags.c
@@ -0,0 +1,120 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2016 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 <sched.h>
+
+#include "alloc-util.h"
+#include "extract-word.h"
+#include "nsflags.h"
+#include "string-util.h"
+
+const struct namespace_flag_map namespace_flag_map[] = {
+ { CLONE_NEWCGROUP, "cgroup" },
+ { CLONE_NEWIPC, "ipc" },
+ { CLONE_NEWNET, "net" },
+ /* So, the mount namespace flag is called CLONE_NEWNS for historical reasons. Let's expose it here under a more
+ * explanatory name: "mnt". This is in-line with how the kernel exposes namespaces in /proc/$PID/ns. */
+ { CLONE_NEWNS, "mnt" },
+ { CLONE_NEWPID, "pid" },
+ { CLONE_NEWUSER, "user" },
+ { CLONE_NEWUTS, "uts" },
+ {}
+};
+
+const char* namespace_flag_to_string(unsigned long flag) {
+ unsigned i;
+
+ flag &= NAMESPACE_FLAGS_ALL;
+
+ for (i = 0; namespace_flag_map[i].name; i++)
+ if (flag == namespace_flag_map[i].flag)
+ return namespace_flag_map[i].name;
+
+ return NULL; /* either unknown namespace flag, or a combination of many. This call supports neither. */
+}
+
+unsigned long namespace_flag_from_string(const char *name) {
+ unsigned i;
+
+ if (isempty(name))
+ return 0;
+
+ for (i = 0; namespace_flag_map[i].name; i++)
+ if (streq(name, namespace_flag_map[i].name))
+ return namespace_flag_map[i].flag;
+
+ return 0;
+}
+
+int namespace_flag_from_string_many(const char *name, unsigned long *ret) {
+ unsigned long flags = 0;
+ int r;
+
+ assert_se(ret);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ unsigned long f;
+
+ r = extract_first_word(&name, &word, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ f = namespace_flag_from_string(word);
+ if (f == 0)
+ return -EINVAL;
+
+ flags |= f;
+ }
+
+ *ret = flags;
+ return 0;
+}
+
+int namespace_flag_to_string_many(unsigned long flags, char **ret) {
+ _cleanup_free_ char *s = NULL;
+ unsigned i;
+
+ for (i = 0; namespace_flag_map[i].name; i++) {
+ if ((flags & namespace_flag_map[i].flag) != namespace_flag_map[i].flag)
+ continue;
+
+ if (!s) {
+ s = strdup(namespace_flag_map[i].name);
+ if (!s)
+ return -ENOMEM;
+ } else {
+ if (!strextend(&s, " ", namespace_flag_map[i].name, NULL))
+ return -ENOMEM;
+ }
+ }
+
+ if (!s) {
+ s = strdup("");
+ if (!s)
+ return -ENOMEM;
+ }
+
+ *ret = s;
+ s = NULL;
+
+ return 0;
+}