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/>.
35 #include "path-util.h"
36 #include "conf-files.h"
40 static char **arg_prefixes = NULL;
42 static const char conf_file_dirs[] =
45 "/usr/local/lib/sysctl.d\0"
52 static char *normalize_sysctl(char *s) {
62 static int apply_sysctl(const char *property, const char *value) {
63 _cleanup_free_ char *p = NULL;
67 log_debug("Setting '%s' to '%s'", property, value);
69 p = new(char, sizeof("/proc/sys/") + strlen(property));
73 n = stpcpy(p, "/proc/sys/");
76 if (!strv_isempty(arg_prefixes)) {
80 STRV_FOREACH(i, arg_prefixes)
81 if (path_startswith(p, *i)) {
87 log_debug("Skipping %s", p);
92 k = write_string_file(p, value);
94 log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
95 "Failed to write '%s' to '%s': %s", value, p, strerror(-k));
97 if (k != -ENOENT && r == 0)
104 static int apply_all(Hashmap *sysctl_options) {
106 char *property, *value;
109 assert(sysctl_options);
111 HASHMAP_FOREACH_KEY(value, property, sysctl_options, i) {
114 k = apply_sysctl(property, value);
121 static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_enoent) {
122 _cleanup_fclose_ FILE *f = NULL;
127 r = search_and_fopen_nulstr(path, "re", conf_file_dirs, &f);
129 if (ignore_enoent && r == -ENOENT)
132 log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r));
136 log_debug("parse: %s\n", path);
138 char l[LINE_MAX], *p, *value, *new_value, *property, *existing;
142 if (!fgets(l, sizeof(l), f)) {
146 log_error("Failed to read file '%s', ignoring: %m", path);
154 if (strchr(COMMENTS "\n", *p))
157 value = strchr(p, '=');
159 log_error("Line is not an assignment in file '%s': %s", path, value);
169 p = normalize_sysctl(strstrip(p));
170 value = strstrip(value);
172 existing = hashmap_get2(sysctl_options, p, &v);
174 if (streq(value, existing))
177 log_info("Overwriting earlier assignment of %s in file '%s'.", p, path);
178 free(hashmap_remove(sysctl_options, p));
182 property = strdup(p);
186 new_value = strdup(value);
192 k = hashmap_put(sysctl_options, property, new_value);
194 log_error("Failed to add sysctl variable %s to hashmap: %s", property, strerror(-k));
204 static int help(void) {
206 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
207 "Applies kernel sysctl settings.\n\n"
208 " -h --help Show this help\n"
209 " --version Show package version\n"
210 " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n",
211 program_invocation_short_name);
216 static int parse_argv(int argc, char *argv[]) {
223 static const struct option options[] = {
224 { "help", no_argument, NULL, 'h' },
225 { "version", no_argument, NULL, ARG_VERSION },
226 { "prefix", required_argument, NULL, ARG_PREFIX },
235 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
243 puts(PACKAGE_STRING);
244 puts(SYSTEMD_FEATURES);
251 for (p = optarg; *p; p++)
255 l = strv_append(arg_prefixes, optarg);
259 strv_free(arg_prefixes);
269 assert_not_reached("Unhandled option");
276 int main(int argc, char *argv[]) {
278 Hashmap *sysctl_options;
280 r = parse_argv(argc, argv);
282 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
284 log_set_target(LOG_TARGET_AUTO);
285 log_parse_environment();
290 sysctl_options = hashmap_new(string_hash_func, string_compare_func);
291 if (!sysctl_options) {
301 for (i = optind; i < argc; i++) {
302 k = parse_file(sysctl_options, argv[i], false);
307 _cleanup_strv_free_ char **files = NULL;
310 r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
312 log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
316 STRV_FOREACH(f, files) {
317 k = parse_file(sysctl_options, *f, true);
323 k = apply_all(sysctl_options);
328 hashmap_free_free_free(sysctl_options);
329 strv_free(arg_prefixes);
331 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;