/* 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 #include #include #include // 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); }