From: Frederic Crozat <fcrozat@suse.com>
Date: Tue, 19 Feb 2013 11:20:31 +0100
Subject: Forward suspend / hibernate calls to pm-utils

forward suspend/hibernation calls to pm-utils, if installed (bnc#790157)
---
 src/sleep/sleep.c | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/src/sleep/sleep.c b/src/sleep/sleep.c
index 0707625..91cbdf9 100644
--- a/src/sleep/sleep.c
+++ b/src/sleep/sleep.c
@@ -22,6 +22,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "log.h"
 #include "util.h"
@@ -32,6 +33,9 @@
 int main(int argc, char *argv[]) {
         const char *verb;
         char* arguments[4];
+        const char *pmtools;
+        bool delegate_to_pmutils = false;
+        struct stat buf;
         int r;
         FILE *f;
 
@@ -45,17 +49,27 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        if (streq(argv[1], "suspend"))
+        if (streq(argv[1], "suspend")) {
                 verb = "mem";
-        else if (streq(argv[1], "hibernate") || streq(argv[1], "hybrid-sleep"))
+                pmtools = "/usr/sbin/pm-suspend";
+        }
+        else if (streq(argv[1], "hibernate") || streq(argv[1], "hybrid-sleep")) {
                 verb = "disk";
+                if (streq(argv[1], "hibernate"))
+                        pmtools = "/usr/sbin/pm-hibernate";
+                else
+                        pmtools = "/usr/sbin/pm-suspend-hybrid";
+        }
         else {
                 log_error("Unknown action '%s'.", argv[1]);
                 r = -EINVAL;
                 goto finish;
         }
 
+        delegate_to_pmutils = (stat(pmtools, &buf) >= 0 && S_ISREG(buf.st_mode) && (buf.st_mode & 0111));
+
         /* Configure the hibernation mode */
+      if (!delegate_to_pmutils) {
         if (streq(argv[1], "hibernate")) {
                 if (write_one_line_file("/sys/power/disk", "platform") < 0)
                         write_one_line_file("/sys/power/disk", "shutdown");
@@ -65,13 +79,14 @@ int main(int argc, char *argv[]) {
                                 write_one_line_file("/sys/power/disk", "shutdown");
         }
 
+
         f = fopen("/sys/power/state", "we");
         if (!f) {
                 log_error("Failed to open /sys/power/state: %m");
                 r = -errno;
                 goto finish;
         }
-
+      }
         arguments[0] = NULL;
         arguments[1] = (char*) "pre";
         arguments[2] = argv[1];
@@ -97,11 +112,16 @@ int main(int argc, char *argv[]) {
                            "SLEEP=hybrid-sleep",
                            NULL);
 
+        if (delegate_to_pmutils) {
+           r = -system(pmtools);
+        }
+        else {
         fputs(verb, f);
         fputc('\n', f);
         fflush(f);
 
         r = ferror(f) ? -errno : 0;
+        }
 
         if (streq(argv[1], "suspend"))
                 log_struct(LOG_INFO,
@@ -119,6 +139,7 @@ int main(int argc, char *argv[]) {
         arguments[1] = (char*) "post";
         execute_directory(SYSTEM_SLEEP_PATH, NULL, arguments);
 
+       if (!delegate_to_pmutils)
         fclose(f);
 
 finish: