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"
37 #define PROC_SYS_PREFIX "/proc/sys/"
39 static char **arg_prefixes = NULL;
41 static int apply_sysctl(const char *property, const char *value) {
45 log_debug("Setting '%s' to '%s'", property, value);
47 p = new(char, sizeof(PROC_SYS_PREFIX) + strlen(property));
51 n = stpcpy(p, PROC_SYS_PREFIX);
58 if (!strv_isempty(arg_prefixes)) {
62 STRV_FOREACH(i, arg_prefixes)
63 if (path_startswith(p, *i)) {
69 log_debug("Skipping %s", p);
75 k = write_one_line_file(p, value);
78 log_full(k == -ENOENT ? LOG_DEBUG : LOG_WARNING,
79 "Failed to write '%s' to '%s': %s", value, p, strerror(-k));
81 if (k != -ENOENT && r == 0)
90 static int apply_file(const char *path, bool ignore_enoent) {
96 if (!(f = fopen(path, "re"))) {
97 if (ignore_enoent && errno == ENOENT)
100 log_error("Failed to open file '%s', ignoring: %m", path);
104 log_debug("apply: %s\n", path);
106 char l[LINE_MAX], *p, *value;
109 if (!fgets(l, sizeof(l), f)) {
113 log_error("Failed to read file '%s', ignoring: %m", path);
123 if (strchr(COMMENTS, *p))
126 if (!(value = strchr(p, '='))) {
127 log_error("Line is not an assignment in file '%s': %s", path, value);
137 if ((k = apply_sysctl(strstrip(p), strstrip(value))) < 0 && r == 0)
147 static int help(void) {
149 printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
150 "Applies kernel sysctl settings.\n\n"
151 " -h --help Show this help\n"
152 " --prefix=PATH Only apply rules that apply to paths with the specified prefix\n",
153 program_invocation_short_name);
158 static int parse_argv(int argc, char *argv[]) {
164 static const struct option options[] = {
165 { "help", no_argument, NULL, 'h' },
166 { "prefix", required_argument, NULL, ARG_PREFIX },
175 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
187 for (p = optarg; *p; p++)
191 l = strv_append(arg_prefixes, optarg);
195 strv_free(arg_prefixes);
205 log_error("Unknown option code %c", c);
213 int main(int argc, char *argv[]) {
216 r = parse_argv(argc, argv);
218 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
220 log_set_target(LOG_TARGET_AUTO);
221 log_parse_environment();
229 for (i = optind; i < argc; i++) {
232 k = apply_file(argv[i], false);
240 r = conf_files_list(&files, ".conf",
243 "/usr/local/lib/sysctl.d",
245 #ifdef HAVE_SPLIT_USR
250 log_error("Failed to enumerate sysctl.d files: %s", strerror(-r));
254 STRV_FOREACH(f, files) {
255 k = apply_file(*f, true);
260 k = apply_file("/etc/sysctl.conf", true);
267 strv_free(arg_prefixes);
269 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;