This module determines the physical temperature of the CPU. Or, if unavailable,
the temperature of the motherboard, as an approximation.
It would also be nice to have a function that returns the temperature of the
rechargeable battery. Does someone have a Linux laptop? Can you run the
'sensors' program (after configuring it through 'sensors-detect' [1]) and tell
the format of the output line that corresponds to this temperature?
This should be useful to avoid burning a CPU, because
- some machines are sold with overclocked CPUs,
- some laptops have rechargeable batteries that can set the computer on fire,
- many machines today have a CD or DVD writer built-in, and while burning
a CD or DVD, you don't want the CPU to be damaged,
- on MacOS X systems, even external hard disks can transmit overheating
conditions to the CPU ("FireWire").
Bruno
[1] http://www.linuxappliancedesign.com/articles/sensors/sensors.html
2007-04-01 Bruno Haible <[EMAIL PROTECTED]>
* modules/phystemp: New file.
* lib/phystemp.h: New file.
* lib/phystemp.c: New file.
============================== modules/phystemp ==============================
Description:
Return physical temperature.
Files:
lib/phystemp.h
lib/phystemp.c
Depends-on:
pipe
wait-process
getline
strtod
configure.ac:
Makefile.am:
Include:
"phystemp.h"
License:
GPL
Maintainer:
Bruno Haible
=============================== lib/phystemp.h ===============================
/* Return physical temperatures.
Copyright (C) 2007 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifndef _PHYSTEMP_H
#define _PHYSTEMP_H
/* Return the physical temperature of the CPU, measured in degrees Celsius.
If it cannot be obtained, return a value < -273. */
extern double phystemp_cpu (void);
#endif /* _PHYSTEMP_H */
=============================== lib/phystemp.c ===============================
/* Return physical temperatures.
Copyright (C) 2007 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <config.h>
/* Specification. */
#include "phystemp.h"
#if defined __linux__
# include <stdio.h>
# include <string.h>
# include "pipe.h"
# include "wait-process.h"
# include "getline.h"
/* On Linux, temperature values are available through the 'sensors' program,
part of the 'sensors' or 'lm_sensors' package
<http://freshmeat.net/projects/lm_sensors/>
<http://www.lm-sensors.org/>
To configure it, run 'sensors-detect' as root and follow the
recommendations. More explanations in this article:
<http://www.linuxappliancedesign.com/articles/sensors/sensors.html> */
double
phystemp_cpu (void)
{
/* The output of the 'sensors' program consists of lines of the form
CPU Temp: +25°C (low = +0°C, high = +50°C)
or
temp1: +34°C (limit = +60°C) sensor =
thermistor
So take the first line of this form. */
char *argv[2];
pid_t child;
int fd[1];
FILE *fp;
char *line;
size_t linesize;
size_t linelen;
int exitstatus;
double temp_cpu;
double temp_mb;
/* Call the sensors program. */
argv[0] = "/usr/bin/sensors";
argv[1] = NULL;
child = create_pipe_in ("sensors", argv[0], argv, DEV_NULL, true, true,
false, fd);
if (child == -1)
return -273 - 1;
/* Retrieve its result. */
fp = fdopen (fd[0], "r");
if (fp == NULL)
return -273 - 1;
temp_cpu = -273 - 1;
temp_mb = -273 - 1;
line = NULL; linesize = 0;
for (;;)
{
linelen = getline (&line, &linesize, fp);
if (linelen == (size_t)(-1))
break;
if (linelen > 0 && line[linelen - 1] == '\n')
line[linelen - 1] = '\0';
if (linelen >= 9 && memcmp (line, "CPU Temp:", 9) == 0)
temp_cpu = strtod (line + 9, NULL);
else if (linelen >= 5 && memcmp (line, "temp:", 5) == 0)
{
if (temp_cpu < -273)
temp_cpu = strtod (line + 5, NULL);
}
else if (linelen >= 6 && memcmp (line, "temp1:", 6) == 0)
{
if (temp_cpu < -273)
temp_cpu = strtod (line + 6, NULL);
}
else if (linelen >= 9 && memcmp (line, "M/B Temp:", 9) == 0)
temp_mb = strtod (line + 9, NULL);
}
fclose (fp);
/* Remove zombie process from process list, and retrieve exit status. */
exitstatus = wait_subprocess (child, "sensors", true, true, true, false);
if (exitstatus != 0)
return -273 - 1;
/* The temperature of the motherboard is a good approximation of the
temperature of the CPU. */
if (temp_cpu < -273)
temp_cpu = temp_mb;
return temp_cpu;
}
#elif defined __BEOS__
# include <OS.h>
double
phystemp_cpu (void)
{
/* Yes, it's a function called 'is_...' that returns a 'double'!
It is specified as
"Returns the temperature of the motherboard if the computer is
currently on fire."
The temperature of the motherboard is a good approximation of the
temperature of the CPU. */
double temp = is_computer_on_fire ();
return (temp > 0 ? temp : -273 - 1);
}
#else
double
phystemp_cpu (void)
{
return -273 - 1;
}
#endif
