From b037ed3e441ffbb5957007eb1a886cf23f54694a Mon Sep 17 00:00:00 2001
From: Juan RP <xtraeme@gmail.com>
Date: Wed, 11 Jun 2014 12:26:35 +0200
Subject: New suspend(8) utility that is able to suspend to ram/disk.

---
 Makefile  |   4 +-
 suspend.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 137 insertions(+), 1 deletion(-)
 create mode 100644 suspend.c

diff --git a/Makefile b/Makefile
index 5638b3f..f4e15f7 100644
--- a/Makefile
+++ b/Makefile
@@ -4,11 +4,13 @@ SCRIPTS=	1 2 3 ctrlaltdel
 all:
 	$(CC) $(CFLAGS) halt.c -o halt
 	$(CC) $(CFLAGS) pause.c -o pause
+	$(CC) $(CFLAGS) suspend.c -o suspend
 
 install:
 	install -d ${DESTDIR}/${PREFIX}/bin
 	install -m755 halt ${DESTDIR}/${PREFIX}/bin
 	install -m755 pause ${DESTDIR}/${PREFIX}/bin
+	install -m755 suspend ${DESTDIR}/${PREFIX}/bin
 	install -m755 shutdown.sh ${DESTDIR}/${PREFIX}/bin/shutdown
 	ln -s halt ${DESTDIR}/${PREFIX}/bin/poweroff
 	ln -s halt ${DESTDIR}/${PREFIX}/bin/reboot
@@ -24,4 +26,4 @@ install:
 	cp -aP services/* ${DESTDIR}/etc/sv/
 
 clean:
-	-rm -f halt pause
+	-rm -f halt pause suspend
diff --git a/suspend.c b/suspend.c
new file mode 100644
index 0000000..7522578
--- /dev/null
+++ b/suspend.c
@@ -0,0 +1,134 @@
+/*-
+ * Copyright (c) 2014 Juan Romero Pardines.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <getopt.h>
+
+#define SYS_STATE	"/sys/power/state"
+#define SYS_DISK	"/sys/power/disk"
+
+#define MODE_RAM	0x1
+#define MODE_DISK	0x2
+
+static void
+usage(bool fail)
+{
+	fprintf(stdout,
+	    "Usage: suspend [OPTIONS]\n\n"
+	    "OPTIONS\n"
+	    " -s --show       Show supported modes\n"
+	    " -h --help       Show usage\n"
+	    " -H --hibernate  Hibernate rather than suspend-to-ram\n\n");
+	exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+static int
+getmodes(void)
+{
+	FILE *f;
+	char v[LINE_MAX];
+	int mode = 0;
+
+	if ((f = fopen(SYS_STATE, "r"))) {
+		fgets(v, sizeof(v), f);
+		fclose(f);
+		if (strstr(v, "mem"))
+			mode |= MODE_RAM;
+		if (strstr(v, "disk"))
+			mode |= MODE_DISK;
+	}
+	return mode;
+}
+
+static void
+writemode(int mode)
+{
+	FILE *f;
+
+	if ((f = fopen("/sys/power/state", "w")) == NULL) {
+		perror("cannot open /sys/power/state");
+		exit(EXIT_FAILURE);
+	}
+	if (mode & MODE_RAM) {
+		fputs("mem", f);
+	} else {
+		fputs("disk", f);
+	}
+	fclose(f);
+}
+
+int
+main(int argc, char **argv)
+{
+	const char *shortopts = "shH";
+	const struct option longopts[] = {
+		{ "show", no_argument, NULL, 's' },
+		{ "help", no_argument, NULL, 'h' },
+		{ "hibernate", no_argument, NULL, 'H' },
+		{ NULL, 0, NULL, 0 }
+	};
+	int c, modes = 0;
+	bool show = false, hibernate = false;
+
+	while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
+		switch (c) {
+		case 's':
+			show = true;
+			break;
+		case 'h':
+			usage(false);
+			/* NOTREACHED */
+		case 'H':
+			hibernate = true;
+			break;
+		case '?':
+		default:
+			usage(true);
+			/* NOTREACHED */
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (show) {
+		modes = getmodes();
+		if (modes & MODE_RAM)
+			printf("suspend-to-ram ");
+		if (modes & MODE_DISK)
+			printf("suspend-to-disk ");
+
+		printf("\n");
+	} else if (hibernate) {
+		writemode(MODE_DISK);
+	} else {
+		writemode(MODE_RAM);
+	}
+
+	exit(EXIT_SUCCESS);
+}
-- 
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