1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
34 #include "path-util.h"
35 #include "conf-files.h"
39 static char **arg_prefixes = NULL;
41 static const char conf_file_dirs[] =
44 "/usr/local/lib/sysctl.d\0"
51 static char *normalize_sysctl(char *s) {
61 static int apply_sysctl(const char *property, const char *value) {
62 _cleanup_free_ char *p = NULL;
66 log_debug("Setting '%s' to '%s'", property, value);
68 p = new(char, sizeof("/proc/sys/") + strlen(property));
72 n = stpcpy(p, "/proc/sys/");
75 if (!strv_isempty(arg_prefixes)) {
79 STRV_FOREACH(i, arg_prefixes)
80 if (path_startswith(p, *i)) {
86 log_debug("Skipping %s", p);
91 k = write_string_file(p, value);
93 log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
94 "Failed to write '%s' to '%s': %s", value, p, strerror(-k));
96 if (k != -ENOENT && r == 0)
103 static int apply_all(Hashmap *sysctl_options) {
105 char *property, *value;
108 assert(sysctl_options);
110 HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
113 k = apply_sysctl(property, value);
120 static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) {
121 _cleanup_fclose_ FILE *f = NULL;
126 r = search_and_fopen_nulstr(path, "re", conf_file_dirs, &f);
128 if (ignore_enoent && r == -ENOENT)
131 log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r));
135 log_debug("parse: %s", path);
137 char l[LINE_MAX], *p, *value, *new_value, *property, *existing;
141 if (!fgets(l, sizeof(l), f)) {
145 log_error("Failed to read file '%s', ignoring: %m", path);
153 if (strchr(COMMENTS "\n", *p))
156 value = strchr(p, '=');
158 log_error("Line is not an assignment in file '%s': %s", path, value);
168 p = normalize_sysctl(strstrip(p));
169 value = strstrip(value);
171 existing = hashmap_get2(sysctl_options, p, &v);
173 if (streq(value, existing))
176 log_info("Overwriting earlier assignment of %s in file '%s'.", p, path);
177 free(hashmap_remove(sysctl_options, p));
181 property = strdup(p);
185 new_value = strdup(value);
191 k = hashmap_put(sysctl_options, property, new_value);
193 log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-k));
203 static int help(void) {
205 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
206 "Applies kernel sysctl settings.\n\n"
207 " -h --help Show this help\n"
208 " --version Show package version\n"
209 " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n",
210 program_invocation_short_name);
215 static int parse_argv(int argc, char *argv[]) {
222 static const struct option options[] = {
223 { "help", no_argument, NULL, 'h' },
224 { "version", no_argument, NULL, ARG_VERSION },
225 { "prefix", required_argument, NULL, ARG_PREFIX },
234 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
242 puts(PACKAGE_STRING);
243 puts(SYSTEMD_FEATURES);
249 for (p = optarg; *p; p++)
253 if (strv_extend(&arg_prefixes, optarg) < 0)
263 assert_not_reached("Unhandled option");
270 int main(int argc, char *argv[]) {
272 Hashmap *sysctl_options;
274 r = parse_argv(argc, argv);
276 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
278 log_set_target(LOG_TARGET_AUTO);
279 log_parse_environment();
284 sysctl_options = hashmap_new(string_hash_func, string_compare_func);
285 if (!sysctl_options) {
295 for (i = optind; i < argc; i++) {
296 k = parse_file(sysctl_options, argv[i], false);
301 _cleanup_strv_free_ char **files = NULL;
304 r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
306 log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
310 STRV_FOREACH(f, files) {
311 k = parse_file(sysctl_options, *f, true);
317 k = apply_all(sysctl_options);
322 hashmap_free_free_free(sysctl_options);
323 strv_free(arg_prefixes);
325 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;