mirror of
https://github.com/mintycube/dwmblocks.git
synced 2024-10-22 14:05:47 +02:00
Switch to poll-based execution of blocks
This commit is contained in:
Utkarsh Verma
parent
770742a8ee
commit
839ccc5b1d
4
config.h
4
config.h
@ -8,8 +8,8 @@ const Block blocks[] = {
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BLOCK("sb-disk", 1800, 19)
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BLOCK("sb-memory", 1800, 20)
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BLOCK("sb-loadavg", 1800, 21)
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BLOCK("sb-volume", 1800, 22)
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BLOCK("sb-volume", 0, 22)
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BLOCK("sb-battery", 5, 23)
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BLOCK("sb-date", 5, 24)
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BLOCK("sb-date", 1, 24)
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BLOCK("sb-network", 5, 25)
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};
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198
main.c
198
main.c
@ -1,17 +1,18 @@
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#define _GNU_SOURCE
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#include <X11/Xlib.h>
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#include <limits.h>
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#include <assert.h>
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#include <signal.h>
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#include <stdbool.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 <sys/epoll.h>
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#include <sys/signalfd.h>
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#include <time.h>
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#include <unistd.h>
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#define LEN(arr) (sizeof(arr) / sizeof(arr[0]))
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#define STR2(a) #a
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#define STR(a) STR2(a)
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#define BLOCK(cmd, interval, signal) {"echo \"" STR(__COUNTER__) "$(" cmd ")\"", interval, signal},
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#define BLOCK(cmd, interval, signal) {"echo \"_$(" cmd ")\"", interval, signal},
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typedef struct {
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const char* command;
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const unsigned int interval;
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@ -22,12 +23,15 @@ typedef struct {
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static Display* dpy;
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static int screen;
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static Window root;
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static unsigned short int statusContinue = 1;
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static char outputs[LEN(blocks)][CMDLENGTH + 2];
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static char statusBar[2][LEN(blocks) * ((LEN(outputs[0]) - 1) + (LEN(DELIMITER) - 1)) + 1];
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static int statusContinue = 1;
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static volatile sig_atomic_t updatedBlocks = 0;
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static struct epoll_event event, events[LEN(blocks) + 2];
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static int pipes[LEN(blocks)][2];
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static int timerFD[2];
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static int signalFD;
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static int epollFD;
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void (*writeStatus)();
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static int pipeFD[2];
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int gcd(int a, int b) {
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int temp;
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@ -39,16 +43,10 @@ int gcd(int a, int b) {
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return a;
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}
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void replace(char *str, char old, char new) {
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for (char *ch = str; *ch; ch++)
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if (*ch == old)
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*ch = new;
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}
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void getCommand(int i, const char *button) {
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void execBlock(int i, const char* button) {
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if (fork() == 0) {
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dup2(pipeFD[1], STDOUT_FILENO);
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close(pipeFD[0]);
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dup2(pipes[i][1], STDOUT_FILENO);
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close(pipes[i][0]);
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if (button)
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setenv("BLOCK_BUTTON", button, 1);
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@ -56,21 +54,15 @@ void getCommand(int i, const char *button) {
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}
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}
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void getCommands(int time) {
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void execBlocks(unsigned long long int time) {
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for (int i = 0; i < LEN(blocks); i++)
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if (time == 0 || (blocks[i].interval != 0 && time % blocks[i].interval == 0))
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getCommand(i, NULL);
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}
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void getSignalCommand(int signal) {
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for (int i = 0; i < LEN(blocks); i++)
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if (blocks[i].signal == signal)
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getCommand(i, NULL);
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execBlock(i, NULL);
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}
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int getStatus(char* new, char* old) {
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strcpy(old, new);
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new[0] = 0;
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new[0] = '\0';
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for (int i = 0; i < LEN(blocks); i++) {
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#ifdef TRAILING_DELIMITER
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@ -81,10 +73,28 @@ int getStatus(char *new, char *old) {
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strcat(new, DELIMITER);
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strcat(new, outputs[i]);
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}
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new[strlen(new)] = 0;
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return strcmp(new, old);
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}
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void updateBlock(int i) {
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char* output = outputs[i];
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char buffer[LEN(outputs[0])];
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int bytesRead = read(pipes[i][0], buffer, LEN(buffer));
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buffer[bytesRead - 1] = '\0';
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// Clear the pipe
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if (bytesRead == LEN(buffer)) {
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char ch;
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while (read(pipes[i][0], &ch, 1) == 1 && ch != '\n')
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;
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}
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if (blocks[i].signal > 0)
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buffer[0] = blocks[i].signal;
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strcpy(output, buffer);
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}
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void debug() {
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// Only write out if text has changed
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if (!getStatus(statusBar[0], statusBar[1]))
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@ -108,87 +118,107 @@ void setRoot() {
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XCloseDisplay(dpy);
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}
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void signalHandler(int sig, siginfo_t *si, void *ucontext) {
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sig -= SIGRTMIN;
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int i = 0;
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while (blocks[i].signal != sig)
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i++;
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const char button[2] = {'0' + si->si_value.sival_int & 0xff, 0};
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getCommand(i, button);
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void signalHandler() {
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struct signalfd_siginfo info;
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read(signalFD, &info, sizeof(info));
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for (int j = 0; j < LEN(blocks); j++) {
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if (blocks[j].signal == info.ssi_signo - SIGRTMIN) {
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char button[] = {'0' + info.ssi_int & 0xff, 0};
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execBlock(j, button);
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break;
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}
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}
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}
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void termHandler(int signal) {
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void termHandler() {
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statusContinue = 0;
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exit(EXIT_SUCCESS);
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}
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void childHandler() {
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char i;
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read(pipeFD[0], &i, 1);
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i -= '0';
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char ch;
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char buffer[LEN(outputs[0]) - 1];
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int j = 0;
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while (j < LEN(buffer) - 1 && read(pipeFD[0], &ch, 1) == 1 && ch != '\n')
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buffer[j++] = ch;
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buffer[j] = 0;
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// Clear the pipe until newline
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while (ch != '\n' && read(pipeFD[0], &ch, 1) == 1);
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char *output = outputs[i];
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if (blocks[i].signal > 0) {
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output[0] = blocks[i].signal;
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output++;
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}
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// Don't write stale output from the pipe. This only happens when signals
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// are received in a rapid succession.
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if ((updatedBlocks & (1 << i)) == 0) {
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updatedBlocks |= 1 << i;
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strcpy(output, buffer);
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writeStatus();
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}
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updatedBlocks &= ~(1 << i);
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}
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void setupSignals() {
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signal(SIGTERM, termHandler);
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signal(SIGINT, termHandler);
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// Handle block update signals
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// Avoid zombie subprocesses
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struct sigaction sa;
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sa.sa_flags = SA_SIGINFO;
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sa.sa_sigaction = signalHandler;
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for (int i = 0; i < LEN(blocks); i++) {
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sa.sa_handler = SIG_DFL;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_NOCLDWAIT;
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sigaction(SIGCHLD, &sa, 0);
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// Handle block update signals
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sigset_t sigset;
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sigemptyset(&sigset);
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for (int i = 0; i < LEN(blocks); i++)
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if (blocks[i].signal > 0)
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sigaction(SIGRTMIN + blocks[i].signal, &sa, NULL);
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sigaddset(&sigset, SIGRTMIN + blocks[i].signal);
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signalFD = signalfd(-1, &sigset, 0);
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sigprocmask(SIG_BLOCK, &sigset, NULL);
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event.data.u32 = LEN(blocks) + 1;
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epoll_ctl(epollFD, EPOLL_CTL_ADD, signalFD, &event);
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}
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// Handle exit of forks
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signal(SIGCHLD, childHandler);
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void init() {
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epollFD = epoll_create(LEN(blocks) + 1);
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event.events = EPOLLIN;
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for (int i = 0; i < LEN(blocks); i++) {
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pipe(pipes[i]);
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event.data.u32 = i;
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epoll_ctl(epollFD, EPOLL_CTL_ADD, pipes[i][0], &event);
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}
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pipe(timerFD);
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event.data.u32 = LEN(blocks);
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epoll_ctl(epollFD, EPOLL_CTL_ADD, timerFD[0], &event);
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setupSignals();
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}
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void statusLoop() {
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getCommands(0);
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execBlocks(0);
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while (statusContinue) {
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int eventCount = epoll_wait(epollFD, events, LEN(events), 1000);
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for (int i = 0; i < eventCount; i++) {
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unsigned int id = events[i].data.u32;
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if (id == LEN(blocks)) {
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unsigned long long int j = 0;
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read(timerFD[0], &j, sizeof(j));
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execBlocks(j);
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} else if (id < LEN(blocks)) {
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updateBlock(events[i].data.u32);
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} else {
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signalHandler();
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}
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}
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if (eventCount)
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writeStatus();
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}
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}
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void timerLoop() {
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close(timerFD[0]);
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unsigned int sleepInterval = -1;
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for (int i = 0; i < LEN(blocks); i++)
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if (blocks[i].interval)
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sleepInterval = gcd(blocks[i].interval, sleepInterval);
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unsigned int i = 0;
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unsigned long long int i = 0;
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struct timespec sleepTime = {sleepInterval, 0};
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struct timespec toSleep = sleepTime;
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while (statusContinue) {
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while (1) {
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// Sleep for `sleepTime` even on being interrupted
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if (nanosleep(&toSleep, &toSleep) == -1)
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continue;
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// Write to status after sleeping
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getCommands(i);
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// Notify parent to update blocks
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write(timerFD[1], &i, sizeof(i));
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// After sleep, reset timer and update counter
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toSleep = sleepTime;
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@ -196,13 +226,19 @@ void statusLoop() {
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}
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}
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int main(int argc, char **argv) {
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pipe(pipeFD);
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int main(const int argc, const char* argv[]) {
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writeStatus = setRoot;
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for (int i = 0; i < argc; i++)
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if (!strcmp("-d", argv[i]))
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writeStatus = debug;
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setupSignals();
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init();
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if (fork() == 0)
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timerLoop();
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else
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statusLoop();
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close(epollFD);
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return 0;
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}
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