Add actledPi.c
New program acteldPi added. Blinks the ACT led on all mass storage I/O, i.e. not only the SD card.
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Ragnar Jensen
GitHub
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cea22cb0b8
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/*
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* This is free and unencumbered software released into the public domain.
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*
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* For more information, please refer to <http://unlicense.org/>
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*
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**************************************************************************
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*
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* A disk activity light for the Raspberry Pi.
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* Blinks the ACT led on all mass storage I/O, i.e. not only the SD card.
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* Based on hddled.c - http://members.optusnet.com.au/foonly/whirlpool/code/hddled.c -
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*
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*
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* To compile:
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* gcc -Wall -O3 -o actledPi actledPi.c
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*
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* Options:
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* -d, --detach Detach from terminal (become a daemon)
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* -r, --refresh=VALUE Refresh interval (default: 20 ms)
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*
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*/
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#define VMSTAT "/proc/vmstat"
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#define ACTLED "/sys/class/leds/led0/brightness"
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#define TRGCTL "/sys/class/leds/led0/trigger"
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#define LOW 0
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#define HIGH 1
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#define _GNU_SOURCE
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#include <argp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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static unsigned int o_refresh = 20; /* milliseconds */
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static int o_detach = 0;
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static volatile sig_atomic_t running = 1;
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static char *line = NULL;
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static size_t len = 0;
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FILE *actled = NULL;
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FILE *trigger_ctl = NULL;
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/* Reread the vmstat file */
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int activity(FILE *vmstat) {
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static unsigned int prev_pgpgin, prev_pgpgout;
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unsigned int pgpgin, pgpgout;
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int found_pgpgin, found_pgpgout;
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int result;
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/* Reload the vmstat file */
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result = TEMP_FAILURE_RETRY(fseek(vmstat, 0L, SEEK_SET));
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if (result) {
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perror("Could not rewind " VMSTAT);
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return result;
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}
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/* Clear glibc's buffer */
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result = TEMP_FAILURE_RETRY(fflush(vmstat));
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if (result) {
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perror("Could not flush input stream");
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return result;
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}
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/* Extract the I/O stats */
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found_pgpgin = found_pgpgout = 0;
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while (getline(&line, &len, vmstat) != -1 && errno != EINTR) {
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if (sscanf(line, "pgpgin %u", &pgpgin))
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found_pgpgin++;
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else if (sscanf(line, "pgpgout %u", &pgpgout))
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found_pgpgout++;
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if (found_pgpgin && found_pgpgout)
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break;
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}
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if (!found_pgpgin || !found_pgpgout) {
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fprintf(stderr, "Could not find required lines in " VMSTAT);
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return -1;
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}
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/* Anything changed? */
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result =
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(prev_pgpgin != pgpgin) ||
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(prev_pgpgout != pgpgout);
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prev_pgpgin = pgpgin;
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prev_pgpgout = pgpgout;
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return result;
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}
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/* Update the LED */
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void led(int on) {
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static int current = 1; /* Ensure the LED turns off on first call */
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if (current == on)
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return;
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if (on) {
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fputs("255\n", actled);
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} else {
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fputs("0\n", actled);
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}
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fflush(actled);
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current = on;
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}
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/* Signal handler -- break out of the main loop */
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void shutdown(int sig) {
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running = 0;
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}
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/* Argp parser function */
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error_t parse_options(int key, char *arg, struct argp_state *state) {
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switch (key) {
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case 'd':
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o_detach = 1;
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break;
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case 'r':
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o_refresh = strtol(arg, NULL, 10);
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if (o_refresh < 10)
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argp_failure(state, EXIT_FAILURE, 0,
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"refresh interval must be at least 10");
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break;
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}
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return 0;
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}
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int main(int argc, char **argv) {
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struct argp_option options[] = {
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{ "detach", 'd', NULL, 0, "Detach from terminal" },
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{ "refresh", 'r', "VALUE", 0, "Refresh interval (default: 20 ms)" },
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{ 0 },
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};
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struct argp parser = {
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NULL, parse_options, NULL,
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"Show disk activity on all disks.",
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NULL, NULL, NULL
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};
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int status = EXIT_FAILURE;
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FILE *vmstat = NULL;
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struct timespec delay;
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/* Parse the command-line */
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parser.options = options;
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if (argp_parse(&parser, argc, argv, ARGP_NO_ARGS, NULL, NULL))
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goto out;
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delay.tv_sec = o_refresh / 1000;
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delay.tv_nsec = 1000000 * (o_refresh % 1000);
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/* Open the vmstat file */
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vmstat = fopen(VMSTAT, "r");
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if (!vmstat) {
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perror("Could not open " VMSTAT " for reading");
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goto out;
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}
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/* Change the trigger on the OK/Act LED to "none" */
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trigger_ctl = fopen(TRGCTL, "rw");
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if (!trigger_ctl) {
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perror("Unable to change LED trigger");
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goto out;
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}
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fputs ("none\n", trigger_ctl);
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fclose (trigger_ctl);
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/* Open the actled file */
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actled = fopen(ACTLED, "w");
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if (!actled) {
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perror("Could not open " ACTLED " for writing");
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goto out;
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}
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/* Ensure the LED is off */
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led(LOW);
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if (activity(vmstat) < 0)
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goto out;
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/* Detach from terminal? */
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if (o_detach) {
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pid_t child = fork();
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if (child < 0) {
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perror("Could not detach from terminal");
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goto out;
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}
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if (child) {
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/* I am the parent */
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status = EXIT_SUCCESS;
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goto out;
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}
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}
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/* We catch these signals so we can clean up */
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{
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struct sigaction action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = shutdown;
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sigemptyset(&action.sa_mask);
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action.sa_flags = 0; /* We block on usleep; don't use SA_RESTART */
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sigaction(SIGHUP, &action, NULL);
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sigaction(SIGINT, &action, NULL);
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sigaction(SIGTERM, &action, NULL);
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}
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/* Loop until signal received */
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while (running) {
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int a;
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if (nanosleep(&delay, NULL) < 0)
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break;
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a = activity(vmstat);
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if (a < 0)
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break;
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led(a);
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}
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/* Ensure the LED is off */
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led(LOW);
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status = EXIT_SUCCESS;
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out:
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if (line) free(line);
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if (vmstat) fclose(vmstat);
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if (actled) {
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fclose(actled);
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trigger_ctl = fopen(TRGCTL, "rw");
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fputs("mmc0\n", trigger_ctl);
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fclose(trigger_ctl);
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}
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return status;
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}
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