147 lines
2.4 KiB
C
147 lines
2.4 KiB
C
/* Disk protection for HP machines.
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*
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* Copyright 2008 Eric Piel
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* Copyright 2009 Pavel Machek <pavel@ucw.cz>
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*
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* GPLv2.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sched.h>
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char unload_heads_path[64];
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int set_unload_heads_path(char *device)
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{
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char devname[64];
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if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
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return -EINVAL;
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strncpy(devname, device + 5, sizeof(devname));
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snprintf(unload_heads_path, sizeof(unload_heads_path),
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"/sys/block/%s/device/unload_heads", devname);
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return 0;
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}
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int valid_disk(void)
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{
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int fd = open(unload_heads_path, O_RDONLY);
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if (fd < 0) {
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perror(unload_heads_path);
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return 0;
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}
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close(fd);
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return 1;
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}
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void write_int(char *path, int i)
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{
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char buf[1024];
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int fd = open(path, O_RDWR);
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if (fd < 0) {
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perror("open");
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exit(1);
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}
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sprintf(buf, "%d", i);
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if (write(fd, buf, strlen(buf)) != strlen(buf)) {
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perror("write");
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exit(1);
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}
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close(fd);
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}
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void set_led(int on)
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{
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write_int("/sys/class/leds/hp::hddprotect/brightness", on);
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}
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void protect(int seconds)
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{
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write_int(unload_heads_path, seconds*1000);
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}
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int on_ac(void)
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{
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// /sys/class/power_supply/AC0/online
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}
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int lid_open(void)
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{
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// /proc/acpi/button/lid/LID/state
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}
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void ignore_me(void)
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{
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protect(0);
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set_led(0);
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}
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int main(int argc, char **argv)
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{
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int fd, ret;
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struct sched_param param;
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if (argc == 1)
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ret = set_unload_heads_path("/dev/sda");
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else if (argc == 2)
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ret = set_unload_heads_path(argv[1]);
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else
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ret = -EINVAL;
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if (ret || !valid_disk()) {
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fprintf(stderr, "usage: %s <device> (default: /dev/sda)\n",
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argv[0]);
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exit(1);
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}
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fd = open("/dev/freefall", O_RDONLY);
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if (fd < 0) {
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perror("/dev/freefall");
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return EXIT_FAILURE;
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}
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daemon(0, 0);
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param.sched_priority = sched_get_priority_max(SCHED_FIFO);
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sched_setscheduler(0, SCHED_FIFO, ¶m);
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mlockall(MCL_CURRENT|MCL_FUTURE);
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signal(SIGALRM, ignore_me);
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for (;;) {
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unsigned char count;
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ret = read(fd, &count, sizeof(count));
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alarm(0);
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if ((ret == -1) && (errno == EINTR)) {
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/* Alarm expired, time to unpark the heads */
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continue;
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}
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if (ret != sizeof(count)) {
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perror("read");
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break;
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}
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protect(21);
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set_led(1);
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if (1 || on_ac() || lid_open())
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alarm(2);
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else
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alarm(20);
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}
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close(fd);
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return EXIT_SUCCESS;
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}
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