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