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dwmblocks.c
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dwmblocks.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <signal.h>
#include <errno.h>
#include <X11/Xlib.h>
#include <sys/signalfd.h>
#include <poll.h>
#define LENGTH(X) (sizeof(X) / sizeof (X[0]))
#define CMDLENGTH 50
typedef struct {
char* icon;
char* command;
unsigned int interval;
unsigned int signal;
} Block;
void sighandler();
void buttonhandler(int ssi_int);
void replace(char *str, char old, char new);
void remove_all(char *str, char to_remove);
void getcmds(int time);
void getsigcmds(int signal);
void setupsignals();
int getstatus(char *str, char *last);
void setroot();
void statusloop();
void termhandler(int signum);
#include "config.h"
static Display *dpy;
static int screen;
static Window root;
static char statusbar[LENGTH(blocks)][CMDLENGTH] = {0};
static char statusstr[2][256];
static int statusContinue = 1;
static int signalFD;
static int timerInterval = -1;
static void (*writestatus) () = setroot;
void replace(char *str, char old, char new)
{
for(char * c = str; *c; c++)
if(*c == old)
*c = new;
}
// the previous function looked nice but unfortunately it didnt work if to_remove was in any position other than the last character
// theres probably still a better way of doing this
void remove_all(char *str, char to_remove) {
char *read = str;
char *write = str;
while (*read) {
if (*read != to_remove) {
*write++ = *read;
}
++read;
}
*write = '\0';
}
int gcd(int a, int b)
{
int temp;
while (b > 0){
temp = a % b;
a = b;
b = temp;
}
return a;
}
//opens process *cmd and stores output in *output
void getcmd(const Block *block, char *output)
{
if (block->signal)
{
output[0] = block->signal;
output++;
}
char *cmd = block->command;
FILE *cmdf = popen(cmd,"r");
if (!cmdf){
//printf("failed to run: %s, %d\n", block->command, errno);
return;
}
char tmpstr[CMDLENGTH] = "";
// TODO decide whether its better to use the last value till next time or just keep trying while the error was the interrupt
// this keeps trying to read if it got nothing and the error was an interrupt
// could also just read to a separate buffer and not move the data over if interrupted
// this way will take longer trying to complete 1 thing but will get it done
// the other way will move on to keep going with everything and the part that failed to read will be wrong till its updated again
// either way you have to save the data to a temp buffer because when it fails it writes nothing and then then it gets displayed before this finishes
char * s;
int e;
do {
errno = 0;
s = fgets(tmpstr, CMDLENGTH-(strlen(delim)+1), cmdf);
e = errno;
} while (!s && e == EINTR);
pclose(cmdf);
int i = strlen(block->icon);
strcpy(output, block->icon);
strcpy(output+i, tmpstr);
remove_all(output, '\n');
i = strlen(output);
if ((i > 0 && block != &blocks[LENGTH(blocks) - 1])){
strcat(output, delim);
}
i+=strlen(delim);
output[i++] = '\0';
}
void getcmds(int time)
{
const Block* current;
for(int i = 0; i < LENGTH(blocks); i++)
{
current = blocks + i;
if ((current->interval != 0 && time % current->interval == 0) || time == -1){
getcmd(current,statusbar[i]);
}
}
}
void getsigcmds(int signal)
{
const Block *current;
for (int i = 0; i < LENGTH(blocks); i++)
{
current = blocks + i;
if (current->signal == signal){
getcmd(current,statusbar[i]);
}
}
}
void setupsignals()
{
sigset_t signals;
sigemptyset(&signals);
sigaddset(&signals, SIGALRM); // Timer events
sigaddset(&signals, SIGUSR1); // Button events
// All signals assigned to blocks
for (size_t i = 0; i < LENGTH(blocks); i++)
if (blocks[i].signal > 0)
sigaddset(&signals, SIGRTMIN + blocks[i].signal);
// Create signal file descriptor for pooling
signalFD = signalfd(-1, &signals, 0);
// Block all real-time signals
for (int i = SIGRTMIN; i <= SIGRTMAX; i++) sigaddset(&signals, i);
sigprocmask(SIG_BLOCK, &signals, NULL);
// Do not transform children into zombies
struct sigaction sigchld_action = {
.sa_handler = SIG_DFL,
.sa_flags = SA_NOCLDWAIT
};
sigaction(SIGCHLD, &sigchld_action, NULL);
}
int getstatus(char *str, char *last)
{
strcpy(last, str);
str[0] = '\0';
for(int i = 0; i < LENGTH(blocks); i++) {
strcat(str, statusbar[i]);
if (i == LENGTH(blocks) - 1)
strcat(str, " ");
}
str[strlen(str)-1] = '\0';
return strcmp(str, last);//0 if they are the same
}
void setroot()
{
if (!getstatus(statusstr[0], statusstr[1]))//Only set root if text has changed.
return;
Display *d = XOpenDisplay(NULL);
if (d) {
dpy = d;
}
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
XStoreName(dpy, root, statusstr[0]);
XCloseDisplay(dpy);
}
void pstdout()
{
if (!getstatus(statusstr[0], statusstr[1]))//Only write out if text has changed.
return;
printf("%s\n",statusstr[0]);
fflush(stdout);
}
void statusloop()
{
setupsignals();
// first figure out the default wait interval by finding the
// greatest common denominator of the intervals
for(int i = 0; i < LENGTH(blocks); i++){
if(blocks[i].interval){
timerInterval = gcd(blocks[i].interval, timerInterval);
}
}
getcmds(-1); // Fist time run all commands
raise(SIGALRM); // Schedule first timer event
int ret;
struct pollfd pfd[] = {{.fd = signalFD, .events = POLLIN}};
while (statusContinue) {
// Wait for new signal
ret = poll(pfd, sizeof(pfd) / sizeof(pfd[0]), -1);
if (ret < 0 || !(pfd[0].revents & POLLIN)) break;
sighandler(); // Handle signal
}
}
void sighandler()
{
static int time = 0;
struct signalfd_siginfo si;
int ret = read(signalFD, &si, sizeof(si));
if (ret < 0) return;
int signal = si.ssi_signo;
switch (signal) {
case SIGALRM:
// Execute blocks and schedule the next timer event
getcmds(time);
alarm(timerInterval);
time += timerInterval;
break;
case SIGUSR1:
// Handle buttons
buttonhandler(si.ssi_int);
return;
default:
// Execute the block that has the given signal
getsigcmds(signal - SIGRTMIN);
break;
}
writestatus();
}
void buttonhandler(int ssi_int)
{
char button[2] = {'0' + ssi_int & 0xff, '\0'};
pid_t process_id = getpid();
int sig = ssi_int >> 8;
if (fork() == 0)
{
const Block *current;
for (int i = 0; i < LENGTH(blocks); i++)
{
current = blocks + i;
if (current->signal == sig)
break;
}
char shcmd[1024];
sprintf(shcmd,"%s && kill -%d %d",current->command, current->signal+34,process_id);
char *command[] = { "/bin/sh", "-c", shcmd, NULL };
setenv("BLOCK_BUTTON", button, 1);
setsid();
execvp(command[0], command);
exit(EXIT_SUCCESS);
}
}
void termhandler(int signum)
{
statusContinue = 0;
}
int main(int argc, char** argv)
{
for(int i = 0; i < argc; i++)
{
if (!strcmp("-d",argv[i]))
delim = argv[++i];
else if(!strcmp("-p",argv[i]))
writestatus = pstdout;
}
signal(SIGTERM, termhandler);
signal(SIGINT, termhandler);
statusloop();
close(signalFD);
}