sysctl: move property handling to shared/

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>

src/shared/Makefile.am

@@ -24,6 +24,7 @@ libudev_shared_la_SOURCES=\
 	strbuf.c \
 	strv.c \
 	strxcpyx.c  \
+	sysctl-util.c \
 	time-util.c \
 	util.c \
 	utf8.c \
@@ -57,6 +58,7 @@ noinst_HEADERS = \
 	strbuf.h \
 	strv.h \
 	strxcpyx.h \
+	sysctl-util.h \
 	time-util.h \
 	util.h \
 	utf8.h \

src/shared/sysctl-util.c

@@ -0,0 +1,87 @@
+/*-*- 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 "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);
+}

src/shared/sysctl-util.h

@@ -0,0 +1,27 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 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/>.
+***/
+
+char *sysctl_normalize(char *s);
+int sysctl_read(const char *property, char **value);
+int sysctl_write(const char *property, const char *value);
+