1 /* SPDX-License-Identifier: LGPL-2.1+ */
7 #include "alloc-util.h"
8 #include "extract-word.h"
11 #include "parse-util.h"
12 #include "proc-cmdline.h"
13 #include "process-util.h"
14 //#include "special.h"
15 #include "string-util.h"
19 int proc_cmdline(char **ret) {
23 /* For testing purposes it is sometimes useful to be able to override what we consider /proc/cmdline to be */
24 e = secure_getenv("SYSTEMD_PROC_CMDLINE");
36 if (detect_container() > 0)
37 return get_process_cmdline(1, 0, false, ret);
39 return read_one_line_file("/proc/cmdline", ret);
42 int proc_cmdline_parse(proc_cmdline_parse_t parse_item, void *data, unsigned flags) {
44 _cleanup_free_ char *line = NULL;
50 r = proc_cmdline(&line);
56 _cleanup_free_ char *word = NULL;
57 char *value, *key, *q;
59 r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
67 /* Filter out arguments that are intended only for the initrd */
68 q = startswith(word, "rd.");
73 if (flags & PROC_CMDLINE_STRIP_RD_PREFIX)
77 value = strchr(key, '=');
81 r = parse_item(key, value, data);
89 static bool relaxed_equal_char(char a, char b) {
92 (a == '_' && b == '-') ||
93 (a == '-' && b == '_');
96 #if 0 /// UNNEEDED by elogind
97 char *proc_cmdline_key_startswith(const char *s, const char *prefix) {
102 /* Much like startswith(), but considers "-" and "_" the same */
104 for (; *prefix != 0; s++, prefix++)
105 if (!relaxed_equal_char(*s, *prefix))
112 bool proc_cmdline_key_streq(const char *x, const char *y) {
116 /* Much like streq(), but considers "-" and "_" the same */
118 for (; *x != 0 || *y != 0; x++, y++)
119 if (!relaxed_equal_char(*x, *y))
125 #if 0 /// UNNEEDED by elogind
126 int proc_cmdline_get_key(const char *key, unsigned flags, char **value) {
127 _cleanup_free_ char *line = NULL, *ret = NULL;
132 /* Looks for a specific key on the kernel command line. Supports two modes:
134 * a) The "value" parameter is used. In this case a parameter beginning with the "key" string followed by "="
135 * is searched, and the value following this is returned in "value".
137 * b) as above, but the PROC_CMDLINE_VALUE_OPTIONAL flag is set. In this case if the key is found as a
138 * separate word (i.e. not followed by "=" but instead by whitespace or the end of the command line), then
139 * this is also accepted, and "value" is returned as NULL.
141 * c) The "value" parameter is NULL. In this case a search for the exact "key" parameter is performed.
143 * In all three cases, > 0 is returned if the key is found, 0 if not. */
148 if ((flags & PROC_CMDLINE_VALUE_OPTIONAL) && !value)
151 r = proc_cmdline(&line);
157 _cleanup_free_ char *word = NULL;
160 r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
166 /* Automatically filter out arguments that are intended only for the initrd, if we are not in the
168 if (!in_initrd() && startswith(word, "rd."))
172 e = proc_cmdline_key_startswith(word, key);
177 r = free_and_strdup(&ret, e+1);
183 } else if (*e == 0 && (flags & PROC_CMDLINE_VALUE_OPTIONAL))
187 if (streq(word, key))
193 *value = TAKE_PTR(ret);
198 int proc_cmdline_get_bool(const char *key, bool *ret) {
199 _cleanup_free_ char *v = NULL;
204 r = proc_cmdline_get_key(key, PROC_CMDLINE_VALUE_OPTIONAL, &v);
212 if (v) { /* parameter passed */
213 r = parse_boolean(v);
217 } else /* no parameter passed */
223 int shall_restore_state(void) {
227 r = proc_cmdline_get_bool("systemd.restore_state", &ret);
231 return r > 0 ? ret : true;
234 static const char * const rlmap[] = {
235 "emergency", SPECIAL_EMERGENCY_TARGET,
236 "-b", SPECIAL_EMERGENCY_TARGET,
237 "rescue", SPECIAL_RESCUE_TARGET,
238 "single", SPECIAL_RESCUE_TARGET,
239 "-s", SPECIAL_RESCUE_TARGET,
240 "s", SPECIAL_RESCUE_TARGET,
241 "S", SPECIAL_RESCUE_TARGET,
242 "1", SPECIAL_RESCUE_TARGET,
243 "2", SPECIAL_MULTI_USER_TARGET,
244 "3", SPECIAL_MULTI_USER_TARGET,
245 "4", SPECIAL_MULTI_USER_TARGET,
246 "5", SPECIAL_GRAPHICAL_TARGET,
250 static const char * const rlmap_initrd[] = {
251 "emergency", SPECIAL_EMERGENCY_TARGET,
252 "rescue", SPECIAL_RESCUE_TARGET,
256 const char* runlevel_to_target(const char *word) {
257 const char * const *rlmap_ptr;
264 word = startswith(word, "rd.");
269 rlmap_ptr = in_initrd() ? rlmap_initrd : rlmap;
271 for (i = 0; rlmap_ptr[i]; i += 2)
272 if (streq(word, rlmap_ptr[i]))
273 return rlmap_ptr[i+1];