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authorLennart Poettering <lennart@poettering.net>2015-10-27 00:06:29 +0100
committerLennart Poettering <lennart@poettering.net>2015-10-27 13:25:57 +0100
commit4e731273edfe852a3eee2949cd20f49fd5b4f6d7 (patch)
tree3e728dfbf3fdfd51261e4b7c2aa6c7b057f0ced6 /src/basic/proc-cmdline.c
parentd4510856a007712900795c79853d2218780c2321 (diff)
util-lib: move /proc/cmdline parsing code to proc-cmdline.[ch]
Diffstat (limited to 'src/basic/proc-cmdline.c')
-rw-r--r--src/basic/proc-cmdline.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/src/basic/proc-cmdline.c b/src/basic/proc-cmdline.c
new file mode 100644
index 0000000000..dd0e18ed6e
--- /dev/null
+++ b/src/basic/proc-cmdline.c
@@ -0,0 +1,144 @@
+/*-*- 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 "extract-word.h"
+#include "fileio.h"
+#include "macro.h"
+#include "parse-util.h"
+#include "proc-cmdline.h"
+#include "process-util.h"
+#include "string-util.h"
+#include "util.h"
+#include "virt.h"
+
+int proc_cmdline(char **ret) {
+ assert(ret);
+
+ if (detect_container() > 0)
+ return get_process_cmdline(1, 0, false, ret);
+ else
+ return read_one_line_file("/proc/cmdline", ret);
+}
+
+int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
+ _cleanup_free_ char *line = NULL;
+ const char *p;
+ int r;
+
+ assert(parse_item);
+
+ r = proc_cmdline(&line);
+ if (r < 0)
+ return r;
+
+ p = line;
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ char *value = NULL;
+
+ r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ /* Filter out arguments that are intended only for the
+ * initrd */
+ if (!in_initrd() && startswith(word, "rd."))
+ continue;
+
+ value = strchr(word, '=');
+ if (value)
+ *(value++) = 0;
+
+ r = parse_item(word, value);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int get_proc_cmdline_key(const char *key, char **value) {
+ _cleanup_free_ char *line = NULL, *ret = NULL;
+ bool found = false;
+ const char *p;
+ int r;
+
+ assert(key);
+
+ r = proc_cmdline(&line);
+ if (r < 0)
+ return r;
+
+ p = line;
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ const char *e;
+
+ r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ /* Filter out arguments that are intended only for the
+ * initrd */
+ if (!in_initrd() && startswith(word, "rd."))
+ continue;
+
+ if (value) {
+ e = startswith(word, key);
+ if (!e)
+ continue;
+
+ r = free_and_strdup(&ret, e);
+ if (r < 0)
+ return r;
+
+ found = true;
+ } else {
+ if (streq(word, key))
+ found = true;
+ }
+ }
+
+ if (value) {
+ *value = ret;
+ ret = NULL;
+ }
+
+ return found;
+
+}
+
+int shall_restore_state(void) {
+ _cleanup_free_ char *value = NULL;
+ int r;
+
+ r = get_proc_cmdline_key("systemd.restore_state=", &value);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return true;
+
+ return parse_boolean(value) != 0;
+}