diff --git a/actledPi.c b/actledPi.c deleted file mode 100644 index d90a0f8..0000000 --- a/actledPi.c +++ /dev/null @@ -1,259 +0,0 @@ -/* - * This is free and unencumbered software released into the public domain. - * - * Anyone is free to copy, modify, publish, use, compile, sell, or - * distribute this software, either in source code form or as a compiled - * binary, for any purpose, commercial or non-commercial, and by any - * means. - * - * In jurisdictions that recognize copyright laws, the author or authors - * of this software dedicate any and all copyright interest in the - * software to the public domain. We make this dedication for the benefit - * of the public at large and to the detriment of our heirs and - * successors. We intend this dedication to be an overt act of - * relinquishment in perpetuity of all present and future rights to this - * software under copyright law. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. - * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR - * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, - * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR - * OTHER DEALINGS IN THE SOFTWARE. - * - * For more information, please refer to - * - ************************************************************************** - * - * A disk activity light for the Raspberry Pi. - * Blinks the ACT led on all mass storage I/O, i.e. not only the SD card. - * Based on hddled.c - http://members.optusnet.com.au/foonly/whirlpool/code/hddled.c - - * - * - * To compile: - * gcc -Wall -O3 -o actledPi actledPi.c - * - * Options: - * -d, --detach Detach from terminal (become a daemon) - * -r, --refresh=VALUE Refresh interval (default: 20 ms) - * - */ - - -#define VMSTAT "/proc/vmstat" -#define ACTLED "/sys/class/leds/led0/brightness" -#define TRGCTL "/sys/class/leds/led0/trigger" -#define LOW 0 -#define HIGH 1 - -#define _GNU_SOURCE - -#include -#include -#include -#include -#include -#include -#include - -static unsigned int o_refresh = 20; /* milliseconds */ -static int o_detach = 0; - -static volatile sig_atomic_t running = 1; -static char *line = NULL; -static size_t len = 0; - -FILE *actled = NULL; -FILE *trigger_ctl = NULL; - -/* Reread the vmstat file */ -int activity(FILE *vmstat) { - static unsigned int prev_pgpgin, prev_pgpgout; - unsigned int pgpgin, pgpgout; - int found_pgpgin, found_pgpgout; - int result; - - /* Reload the vmstat file */ - result = TEMP_FAILURE_RETRY(fseek(vmstat, 0L, SEEK_SET)); - if (result) { - perror("Could not rewind " VMSTAT); - return result; - } - - /* Clear glibc's buffer */ - result = TEMP_FAILURE_RETRY(fflush(vmstat)); - if (result) { - perror("Could not flush input stream"); - return result; - } - - /* Extract the I/O stats */ - found_pgpgin = found_pgpgout = 0; - while (getline(&line, &len, vmstat) != -1 && errno != EINTR) { - if (sscanf(line, "pgpgin %u", &pgpgin)) - found_pgpgin++; - else if (sscanf(line, "pgpgout %u", &pgpgout)) - found_pgpgout++; - if (found_pgpgin && found_pgpgout) - break; - } - if (!found_pgpgin || !found_pgpgout) { - fprintf(stderr, "Could not find required lines in " VMSTAT); - return -1; - } - - /* Anything changed? */ - result = - (prev_pgpgin != pgpgin) || - (prev_pgpgout != pgpgout); - prev_pgpgin = pgpgin; - prev_pgpgout = pgpgout; - - return result; -} - -/* Update the LED */ -void led(int on) { - static int current = 1; /* Ensure the LED turns off on first call */ - if (current == on) - return; - - if (on) { - fputs("255\n", actled); - } else { - fputs("0\n", actled); - } - fflush(actled); - current = on; -} - -/* Signal handler -- break out of the main loop */ -void shutdown(int sig) { - running = 0; -} - -/* Argp parser function */ -error_t parse_options(int key, char *arg, struct argp_state *state) { - switch (key) { - case 'd': - o_detach = 1; - break; - case 'r': - o_refresh = strtol(arg, NULL, 10); - if (o_refresh < 10) - argp_failure(state, EXIT_FAILURE, 0, - "refresh interval must be at least 10"); - break; - } - return 0; -} - -int main(int argc, char **argv) { - struct argp_option options[] = { - { "detach", 'd', NULL, 0, "Detach from terminal" }, - { "refresh", 'r', "VALUE", 0, "Refresh interval (default: 20 ms)" }, - { 0 }, - }; - struct argp parser = { - NULL, parse_options, NULL, - "Show disk activity on all disks.", - NULL, NULL, NULL - }; - int status = EXIT_FAILURE; - FILE *vmstat = NULL; - struct timespec delay; - - /* Parse the command-line */ - parser.options = options; - if (argp_parse(&parser, argc, argv, ARGP_NO_ARGS, NULL, NULL)) - goto out; - - delay.tv_sec = o_refresh / 1000; - delay.tv_nsec = 1000000 * (o_refresh % 1000); - - - /* Open the vmstat file */ - vmstat = fopen(VMSTAT, "r"); - if (!vmstat) { - perror("Could not open " VMSTAT " for reading"); - goto out; - } - - /* Change the trigger on the OK/Act LED to "none" */ - - trigger_ctl = fopen(TRGCTL, "rw"); - if (!trigger_ctl) { - perror("Unable to change LED trigger"); - goto out; - } - fputs ("none\n", trigger_ctl); - fclose (trigger_ctl); - - - /* Open the actled file */ - actled = fopen(ACTLED, "w"); - if (!actled) { - perror("Could not open " ACTLED " for writing"); - goto out; - } - - /* Ensure the LED is off */ - led(LOW); - - if (activity(vmstat) < 0) - goto out; - - /* Detach from terminal? */ - if (o_detach) { - pid_t child = fork(); - if (child < 0) { - perror("Could not detach from terminal"); - goto out; - } - if (child) { - /* I am the parent */ - status = EXIT_SUCCESS; - goto out; - } - } - - /* We catch these signals so we can clean up */ - { - struct sigaction action; - memset(&action, 0, sizeof(action)); - action.sa_handler = shutdown; - sigemptyset(&action.sa_mask); - action.sa_flags = 0; /* We block on usleep; don't use SA_RESTART */ - sigaction(SIGHUP, &action, NULL); - sigaction(SIGINT, &action, NULL); - sigaction(SIGTERM, &action, NULL); - } - - /* Loop until signal received */ - while (running) { - int a; - if (nanosleep(&delay, NULL) < 0) - break; - a = activity(vmstat); - if (a < 0) - break; - led(a); - } - - /* Ensure the LED is off */ - led(LOW); - - status = EXIT_SUCCESS; - -out: - if (line) free(line); - if (vmstat) fclose(vmstat); - if (actled) { - fclose(actled); - trigger_ctl = fopen(TRGCTL, "rw"); - fputs("mmc0\n", trigger_ctl); - fclose(trigger_ctl); - } - return status; -}