auto import from //depot/cupcake/@135843
diff --git a/libcutils/cpu_info.c b/libcutils/cpu_info.c
new file mode 100644
index 0000000..23dda8a
--- /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);
+}