diff options
Diffstat (limited to 'src/libsystemd-basic/src/proc-cmdline.c')
| -rw-r--r-- | src/libsystemd-basic/src/proc-cmdline.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/libsystemd-basic/src/proc-cmdline.c b/src/libsystemd-basic/src/proc-cmdline.c new file mode 100644 index 0000000000..9f8e923e28 --- /dev/null +++ b/src/libsystemd-basic/src/proc-cmdline.c @@ -0,0 +1,188 @@ +/*** + 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 <stdbool.h> +#include <stddef.h> +#include <string.h> + +#include "systemd-basic/alloc-util.h" +#include "systemd-basic/extract-word.h" +#include "systemd-basic/fileio.h" +#include "systemd-basic/macro.h" +#include "systemd-basic/parse-util.h" +#include "systemd-basic/proc-cmdline.h" +#include "systemd-basic/process-util.h" +#include "systemd-basic/special.h" +#include "systemd-basic/string-util.h" +#include "systemd-basic/util.h" +#include "systemd-basic/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); +} + +static const char * const rlmap[] = { + "emergency", SPECIAL_EMERGENCY_TARGET, + "-b", SPECIAL_EMERGENCY_TARGET, + "rescue", SPECIAL_RESCUE_TARGET, + "single", SPECIAL_RESCUE_TARGET, + "-s", SPECIAL_RESCUE_TARGET, + "s", SPECIAL_RESCUE_TARGET, + "S", SPECIAL_RESCUE_TARGET, + "1", SPECIAL_RESCUE_TARGET, + "2", SPECIAL_MULTI_USER_TARGET, + "3", SPECIAL_MULTI_USER_TARGET, + "4", SPECIAL_MULTI_USER_TARGET, + "5", SPECIAL_GRAPHICAL_TARGET, + NULL +}; + +static const char * const rlmap_initrd[] = { + "emergency", SPECIAL_EMERGENCY_TARGET, + "rescue", SPECIAL_RESCUE_TARGET, + NULL +}; + +const char* runlevel_to_target(const char *word) { + size_t i; + const char * const *rlmap_ptr = in_initrd() ? rlmap_initrd + : rlmap; + + if (!word) + return NULL; + + if (in_initrd() && (word = startswith(word, "rd.")) == NULL) + return NULL; + + for (i = 0; rlmap_ptr[i] != NULL; i += 2) + if (streq(word, rlmap_ptr[i])) + return rlmap_ptr[i+1]; + + return NULL; +} |