summaryrefslogtreecommitdiffstats
path: root/src/shared/sysctl-util.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:25:50 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:25:50 +0000
commit19f4f86bfed21c5326ed2acebe1163f3a83e832b (patch)
treed59b9989ce55ed23693e80974d94c856f1c2c8b1 /src/shared/sysctl-util.c
parentInitial commit. (diff)
downloadsystemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.tar.xz
systemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.zip
Adding upstream version 241.upstream/241upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/shared/sysctl-util.c')
-rw-r--r--src/shared/sysctl-util.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/src/shared/sysctl-util.c b/src/shared/sysctl-util.c
new file mode 100644
index 0000000..480e6c3
--- /dev/null
+++ b/src/shared/sysctl-util.c
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "fd-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "macro.h"
+#include "string-util.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) {
+ char *p;
+ _cleanup_close_ int fd = -1;
+
+ assert(property);
+ assert(value);
+
+ log_debug("Setting '%s' to '%.*s'.", property, (int) strcspn(value, NEWLINE), value);
+
+ p = strjoina("/proc/sys/", property);
+ fd = open(p, O_WRONLY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ if (!endswith(value, "\n"))
+ value = strjoina(value, "\n");
+
+ if (write(fd, value, strlen(value)) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int sysctl_read(const char *property, char **content) {
+ char *p;
+
+ assert(property);
+ assert(content);
+
+ p = strjoina("/proc/sys/", property);
+ return read_full_file(p, content, NULL);
+}