1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright 2010 Lennart Poettering
10 #include "alloc-util.h"
11 #include "extract-word.h"
14 #include "parse-util.h"
15 #include "proc-cmdline.h"
16 #include "process-util.h"
17 //#include "special.h"
18 #include "string-util.h"
22 int proc_cmdline(char **ret) {
26 /* For testing purposes it is sometimes useful to be able to override what we consider /proc/cmdline to be */
27 e = secure_getenv("SYSTEMD_PROC_CMDLINE");
39 if (detect_container() > 0)
40 return get_process_cmdline(1, 0, false, ret);
42 return read_one_line_file("/proc/cmdline", ret);
45 int proc_cmdline_parse(proc_cmdline_parse_t parse_item, void *data, unsigned flags) {
47 _cleanup_free_ char *line = NULL;
53 r = proc_cmdline(&line);
59 _cleanup_free_ char *word = NULL;
60 char *value, *key, *q;
62 r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
70 /* Filter out arguments that are intended only for the initrd */
71 q = startswith(word, "rd.");
76 if (flags & PROC_CMDLINE_STRIP_RD_PREFIX)
80 value = strchr(key, '=');
84 r = parse_item(key, value, data);
92 static bool relaxed_equal_char(char a, char b) {
95 (a == '_' && b == '-') ||
96 (a == '-' && b == '_');
99 #if 0 /// UNNEEDED by elogind
100 char *proc_cmdline_key_startswith(const char *s, const char *prefix) {
105 /* Much like startswith(), but considers "-" and "_" the same */
107 for (; *prefix != 0; s++, prefix++)
108 if (!relaxed_equal_char(*s, *prefix))
115 bool proc_cmdline_key_streq(const char *x, const char *y) {
119 /* Much like streq(), but considers "-" and "_" the same */
121 for (; *x != 0 || *y != 0; x++, y++)
122 if (!relaxed_equal_char(*x, *y))
128 #if 0 /// UNNEEDED by elogind
129 int proc_cmdline_get_key(const char *key, unsigned flags, char **value) {
130 _cleanup_free_ char *line = NULL, *ret = NULL;
135 /* Looks for a specific key on the kernel command line. Supports two modes:
137 * a) The "value" parameter is used. In this case a parameter beginning with the "key" string followed by "="
138 * is searched, and the value following this is returned in "value".
140 * b) as above, but the PROC_CMDLINE_VALUE_OPTIONAL flag is set. In this case if the key is found as a
141 * separate word (i.e. not followed by "=" but instead by whitespace or the end of the command line), then
142 * this is also accepted, and "value" is returned as NULL.
144 * c) The "value" parameter is NULL. In this case a search for the exact "key" parameter is performed.
146 * In all three cases, > 0 is returned if the key is found, 0 if not. */
151 if ((flags & PROC_CMDLINE_VALUE_OPTIONAL) && !value)
154 r = proc_cmdline(&line);
160 _cleanup_free_ char *word = NULL;
163 r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
169 /* Automatically filter out arguments that are intended only for the initrd, if we are not in the
171 if (!in_initrd() && startswith(word, "rd."))
175 e = proc_cmdline_key_startswith(word, key);
180 r = free_and_strdup(&ret, e+1);
186 } else if (*e == 0 && (flags & PROC_CMDLINE_VALUE_OPTIONAL))
190 if (streq(word, key))
196 *value = TAKE_PTR(ret);
201 int proc_cmdline_get_bool(const char *key, bool *ret) {
202 _cleanup_free_ char *v = NULL;
207 r = proc_cmdline_get_key(key, PROC_CMDLINE_VALUE_OPTIONAL, &v);
215 if (v) { /* parameter passed */
216 r = parse_boolean(v);
220 } else /* no parameter passed */
226 int shall_restore_state(void) {
230 r = proc_cmdline_get_bool("systemd.restore_state", &ret);
234 return r > 0 ? ret : true;
237 static const char * const rlmap[] = {
238 "emergency", SPECIAL_EMERGENCY_TARGET,
239 "-b", SPECIAL_EMERGENCY_TARGET,
240 "rescue", SPECIAL_RESCUE_TARGET,
241 "single", SPECIAL_RESCUE_TARGET,
242 "-s", SPECIAL_RESCUE_TARGET,
243 "s", SPECIAL_RESCUE_TARGET,
244 "S", SPECIAL_RESCUE_TARGET,
245 "1", SPECIAL_RESCUE_TARGET,
246 "2", SPECIAL_MULTI_USER_TARGET,
247 "3", SPECIAL_MULTI_USER_TARGET,
248 "4", SPECIAL_MULTI_USER_TARGET,
249 "5", SPECIAL_GRAPHICAL_TARGET,
253 static const char * const rlmap_initrd[] = {
254 "emergency", SPECIAL_EMERGENCY_TARGET,
255 "rescue", SPECIAL_RESCUE_TARGET,
259 const char* runlevel_to_target(const char *word) {
260 const char * const *rlmap_ptr;
267 word = startswith(word, "rd.");
272 rlmap_ptr = in_initrd() ? rlmap_initrd : rlmap;
274 for (i = 0; rlmap_ptr[i]; i += 2)
275 if (streq(word, rlmap_ptr[i]))
276 return rlmap_ptr[i+1];