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authorIvan Shapovalov <intelfx100@gmail.com>2014-08-27 00:17:44 +0400
committerLennart Poettering <lennart@poettering.net>2014-08-26 22:19:54 +0200
commit42483a747489ff46aed3588b78bf4b9480dbeaf7 (patch)
treec36c68635b606764bae8e575c224d677afc8f8e1 /src/hibernate-resume
parent66f311206e908a5b6f21e66fad73e1e5ea3e31d6 (diff)
hibernate-resume: add a tool to write a device node's major:minor to /sys/power/resume.
This can be used to initiate a resume from hibernation by path to a swap device containing the hibernation image. The respective templated unit is also added. It is instantiated using path to the desired resume device.
Diffstat (limited to 'src/hibernate-resume')
l---------src/hibernate-resume/Makefile1
-rw-r--r--src/hibernate-resume/hibernate-resume.c81
2 files changed, 82 insertions, 0 deletions
diff --git a/src/hibernate-resume/Makefile b/src/hibernate-resume/Makefile
new file mode 120000
index 0000000000..d0b0e8e008
--- /dev/null
+++ b/src/hibernate-resume/Makefile
@@ -0,0 +1 @@
+../Makefile \ No newline at end of file
diff --git a/src/hibernate-resume/hibernate-resume.c b/src/hibernate-resume/hibernate-resume.c
new file mode 100644
index 0000000000..8f68f81f9e
--- /dev/null
+++ b/src/hibernate-resume/hibernate-resume.c
@@ -0,0 +1,81 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ 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 <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "util.h"
+#include "fileio.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);
+
+ device = argv[1];
+
+ if (stat(device, &st) < 0) {
+ log_error("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);
+ if (r < 0) {
+ log_error("Failed to write '%s' to /sys/power/resume: %s", major_minor, strerror(-r));
+ 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;
+}