Android: Use syscall to write to sysfs nodes

index 435cd95..b11bdc7 100644
@@ -1,4 +1,4 @@
-From 604d8f6da54524f0f7bfdd7aea91d353b4f1b612 Mon Sep 17 00:00:00 2001
+From 4570b7d6559047b384c50b4766e168fd5e11db8e Mon Sep 17 00:00:00 2001
 From: Daniel Leung <daniel.leung(a)intel.com>
 Date: Wed, 25 Feb 2015 13:24:14 -0800
 Subject: [PATCH 1/1] Android: disable C++ exceptions

@@ -11,11 +11,11 @@ Signed-off-by: Daniel Leung <daniel.leung(a)intel.com>
  Android.mk           |  2 +-
  src/devices/ahci.cpp |  8 ++++++++
  src/devices/alsa.cpp |  8 ++++++++
- src/lib.cpp          | 19 +++++++++++++++++++
- 4 files changed, 36 insertions(+), 1 deletion(-)
+ src/lib.cpp          | 15 +++++++++++++++
+ 4 files changed, 32 insertions(+), 1 deletion(-)
 
 diff --git a/Android.mk b/Android.mk
-index dd98d0f..f6b8689 100644
+index 0c95e3a..ff1040a 100644
 --- a/Android.mk
 +++ b/Android.mk
 @@ -14,7 +14,7 @@ LOCAL_MODULE := powertop

@@ -128,28 +128,10 @@ index a1fca71..ba3c0b6 100644
  	p = (end_active - start_active) / (0.001 + end_active + end_inactive - start_active - start_inactive) * 100.0;
  	report_utilization(name, p);
 diff --git a/src/lib.cpp b/src/lib.cpp
-index 0dec0b7..91dac7a 100644
+index 24d6d07..4812ff1 100644
 --- a/src/lib.cpp
 +++ b/src/lib.cpp
-@@ -176,13 +176,17 @@ void write_sysfs(const string &filename, const string &value)
- 	file.open(filename.c_str(), ios::out);
- 	if (!file)
- 		return;
-+#ifndef DISABLE_TRYCATCH
- 	try
- 	{
-+#endif
- 		file << value;
- 		file.close();
-+#ifndef DISABLE_TRYCATCH
- 	} catch (std::exception &exc) {
- 		return;
- 	}
-+#endif
- }
- 
- int read_sysfs(const string &filename, bool *ok)
-@@ -196,16 +200,23 @@ int read_sysfs(const string &filename, bool *ok)
+@@ -210,16 +210,23 @@ int read_sysfs(const string &filename, bool *ok)
  			*ok = false;
  		return 0;
  	}

@@ -173,7 +155,7 @@ index 0dec0b7..91dac7a 100644
  	file.close();
  	return i;
  }
-@@ -219,17 +230,21 @@ string read_sysfs_string(const string &filename)
+@@ -233,17 +240,21 @@ string read_sysfs_string(const string &filename)
  	file.open(filename.c_str(), ios::in);
  	if (!file)
  		return "";

@@ -195,7 +177,7 @@ index 0dec0b7..91dac7a 100644
  	return content;
  }
  
-@@ -246,17 +261,21 @@ string read_sysfs_string(const char *format, const char *param)
+@@ -260,17 +271,21 @@ string read_sysfs_string(const char *format, const char *param)
  	file.open(filename, ios::in);
  	if (!file)
  		return "";

index 6b1bc0a..24d6d07 100644
@@ -171,6 +171,7 @@ void set_max_cpu(int cpu)
 
 void write_sysfs(const string &filename, const string &value)
 {
+#ifndef ANDROID
 	ofstream file;
 
 	file.open(filename.c_str(), ios::out);

@@ -183,6 +184,19 @@ void write_sysfs(const string &filename, const string &value)
 	} catch (std::exception &exc) {
 		return;
 	}
+#else
+	int fd;
+
+	fd = ::open(filename.c_str(), O_WRONLY);
+	if (fd < 0)
+		return;
+
+	::write(fd, value.c_str(), value.length());
+
+	close(fd);
+
+	return;
+#endif
 }
 
 int read_sysfs(const string &filename, bool *ok)