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-rw-r--r--src/systemd-hibernate-resume/hibernate-resume.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/src/systemd-hibernate-resume/hibernate-resume.c b/src/systemd-hibernate-resume/hibernate-resume.c
new file mode 100644
index 0000000000..21df3c4461
--- /dev/null
+++ b/src/systemd-hibernate-resume/hibernate-resume.c
@@ -0,0 +1,82 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Ivan Shapovalov
+
+ 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 <errno.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+#include "alloc-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "util.h"
+
+int main(int argc, char *argv[]) {
+ struct stat st;
+ const char *device;
+ _cleanup_free_ char *major_minor = NULL;
+ int r;
+
+ if (argc != 2) {
+ log_error("This program expects one argument.");
+ return EXIT_FAILURE;
+ }
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ /* Refuse to run unless we are in an initrd() */
+ if (!in_initrd())
+ return EXIT_SUCCESS;
+
+ device = argv[1];
+
+ if (stat(device, &st) < 0) {
+ log_error_errno(errno, "Failed to stat '%s': %m", device);
+ return EXIT_FAILURE;
+ }
+
+ if (!S_ISBLK(st.st_mode)) {
+ log_error("Resume device '%s' is not a block device.", device);
+ return EXIT_FAILURE;
+ }
+
+ if (asprintf(&major_minor, "%d:%d", major(st.st_rdev), minor(st.st_rdev)) < 0) {
+ log_oom();
+ return EXIT_FAILURE;
+ }
+
+ r = write_string_file("/sys/power/resume", major_minor, WRITE_STRING_FILE_CREATE);
+ if (r < 0) {
+ log_error_errno(r, "Failed to write '%s' to /sys/power/resume: %m", major_minor);
+ return EXIT_FAILURE;
+ }
+
+ /*
+ * The write above shall not return.
+ *
+ * However, failed resume is a normal condition (may mean that there is
+ * no hibernation image).
+ */
+
+ log_info("Could not resume from '%s' (%s).", device, major_minor);
+ return EXIT_SUCCESS;
+}