1 files changed, 83 insertions, 0 deletions
diff --git a/libcutils/cpu_info.c b/libcutils/cpu_info.c
new file mode 100644
index 000000000..23dda8aa1
--- /dev/null
+++ b/libcutils/cpu_info.c
@@ -0,0 +1,83 @@
+/* libs/cutils/cpu_info.c
+**
+** Copyright 2007, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#include <cutils/cpu_info.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+// we cache the serial number here.
+// this is also used as a fgets() line buffer when we are reading /proc/cpuinfo
+static char serial_number[100] = { 0 };
+
+extern const char* get_cpu_serial_number(void)
+{
+    if (serial_number[0] == 0)
+    {
+        FILE* file;
+        char* chp, *end;
+        char* whitespace;
+        int length;
+        
+        // read serial number from /proc/cpuinfo
+        file = fopen("proc/cpuinfo", "r");
+        if (! file)
+            return NULL;
+        
+        while ((chp = fgets(serial_number, sizeof(serial_number), file)) != NULL)
+        {
+            // look for something like "Serial          : 999206122a03591c"
+
+            if (strncmp(chp, "Serial", 6) != 0)
+                continue;
+            
+            chp = strchr(chp, ':');
+            if (!chp)
+                continue;
+                
+             // skip colon and whitespace
+            while ( *(++chp) == ' ') {}
+            
+            // truncate trailing whitespace
+            end = chp;
+            while (*end && *end != ' ' && *end != '\t' && *end != '\n' && *end != '\r')
+                ++end;
+            *end = 0; 
+            
+            whitespace = strchr(chp, ' ');
+            if (whitespace)
+                *whitespace = 0;
+            whitespace = strchr(chp, '\t');
+            if (whitespace)
+                *whitespace = 0;
+            whitespace = strchr(chp, '\r');
+            if (whitespace)
+                *whitespace = 0;
+            whitespace = strchr(chp, '\n');
+            if (whitespace)
+                *whitespace = 0;
+
+            // shift serial number to beginning of the buffer
+            memmove(serial_number, chp, strlen(chp) + 1);
+            break;
+        }
+        
+        fclose(file);
+    }
+
+    return (serial_number[0] ? serial_number : NULL);
+}