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yaml --- r: 131551 b: refs/heads/master c: bcf8951 h: refs/heads/master i: 131549: 4a3579b 131547: 4ac4cb5 131543: 27e4e39 131535: 405f397 131519: 00dbe20 v: v3
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Linus Torvalds
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Feb 19, 2009
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--- | ||
refs/heads/master: 07db1c140eb233971341396e492cc73d4280e698 | ||
refs/heads/master: bcf8951fc23476c9190a7df0bc501ff47d0c3a61 |
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/* Disk protection for HP machines. | ||
* | ||
* Copyright 2008 Eric Piel | ||
* Copyright 2009 Pavel Machek <pavel@suse.cz> | ||
* | ||
* GPLv2. | ||
*/ | ||
|
||
#include <stdio.h> | ||
#include <stdlib.h> | ||
#include <unistd.h> | ||
#include <fcntl.h> | ||
#include <sys/stat.h> | ||
#include <sys/types.h> | ||
#include <string.h> | ||
#include <stdint.h> | ||
#include <errno.h> | ||
#include <signal.h> | ||
|
||
void write_int(char *path, int i) | ||
{ | ||
char buf[1024]; | ||
int fd = open(path, O_RDWR); | ||
if (fd < 0) { | ||
perror("open"); | ||
exit(1); | ||
} | ||
sprintf(buf, "%d", i); | ||
if (write(fd, buf, strlen(buf)) != strlen(buf)) { | ||
perror("write"); | ||
exit(1); | ||
} | ||
close(fd); | ||
} | ||
|
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void set_led(int on) | ||
{ | ||
write_int("/sys/class/leds/hp::hddprotect/brightness", on); | ||
} | ||
|
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void protect(int seconds) | ||
{ | ||
write_int("/sys/block/sda/device/unload_heads", seconds*1000); | ||
} | ||
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int on_ac(void) | ||
{ | ||
// /sys/class/power_supply/AC0/online | ||
} | ||
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int lid_open(void) | ||
{ | ||
// /proc/acpi/button/lid/LID/state | ||
} | ||
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void ignore_me(void) | ||
{ | ||
protect(0); | ||
set_led(0); | ||
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} | ||
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int main(int argc, char* argv[]) | ||
{ | ||
int fd, ret; | ||
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fd = open("/dev/freefall", O_RDONLY); | ||
if (fd < 0) { | ||
perror("open"); | ||
return EXIT_FAILURE; | ||
} | ||
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signal(SIGALRM, ignore_me); | ||
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for (;;) { | ||
unsigned char count; | ||
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ret = read(fd, &count, sizeof(count)); | ||
alarm(0); | ||
if ((ret == -1) && (errno == EINTR)) { | ||
/* Alarm expired, time to unpark the heads */ | ||
continue; | ||
} | ||
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if (ret != sizeof(count)) { | ||
perror("read"); | ||
break; | ||
} | ||
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protect(21); | ||
set_led(1); | ||
if (1 || on_ac() || lid_open()) { | ||
alarm(2); | ||
} else { | ||
alarm(20); | ||
} | ||
} | ||
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close(fd); | ||
return EXIT_SUCCESS; | ||
} |
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