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-rw-r--r--src/shared/sysctl-util.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/src/shared/sysctl-util.c b/src/shared/sysctl-util.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 <stdlib.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <limits.h>
+#include <getopt.h>
+
+#include "log.h"
+#include "util.h"
+#include "fileio.h"
+#include "build.h"
+#include "sysctl-util.h"
+
+char *sysctl_normalize(char *s) {
+ char *n;
+
+ n = strpbrk(s, "/.");
+ /* If the first separator is a slash, the path is
+ * assumed to be normalized and slashes remain slashes
+ * and dots remains dots. */
+ if (!n || *n == '/')
+ return s;
+
+ /* Otherwise, dots become slashes and slashes become
+ * dots. Fun. */
+ while (n) {
+ if (*n == '.')
+ *n = '/';
+ else
+ *n = '.';
+
+ n = strpbrk(n + 1, "/.");
+ }
+
+ return s;
+}
+
+int sysctl_write(const char *property, const char *value) {
+ _cleanup_free_ char *p = NULL;
+ char *n;
+
+ log_debug("Setting '%s' to '%s'", property, value);
+
+ p = new(char, strlen("/proc/sys/") + strlen(property) + 1);
+ if (!p)
+ return log_oom();
+
+ n = stpcpy(p, "/proc/sys/");
+ strcpy(n, property);
+
+ return write_string_file(p, value);
+}
+
+int sysctl_read(const char *property, char **content) {
+ _cleanup_free_ char *p = NULL;
+ char *n;
+
+ p = new(char, strlen("/proc/sys/") + strlen(property) + 1);
+ if (!p)
+ return log_oom();
+
+ n = stpcpy(p, "/proc/sys/");
+ strcpy(n, property);
+
+ return read_full_file(p, content, NULL);
+}