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#include "../include/GlobalHotkeysLinux.hpp"
#include <signal.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <string.h>
#define PIPE_READ 0
#define PIPE_WRITE 1
namespace gsr {
GlobalHotkeysLinux::GlobalHotkeysLinux() {
for(int i = 0; i < 2; ++i) {
pipes[i] = -1;
}
}
GlobalHotkeysLinux::~GlobalHotkeysLinux() {
for(int i = 0; i < 2; ++i) {
if(pipes[i] > 0)
close(pipes[i]);
}
if(read_file)
fclose(read_file);
if(process_id > 0) {
kill(process_id, SIGKILL);
int status;
waitpid(process_id, &status, 0);
}
}
bool GlobalHotkeysLinux::start() {
if(process_id > 0)
return false;
if(pipe(pipes) == -1)
return false;
const pid_t pid = vfork();
if(pid == -1) {
perror("Failed to vfork");
for(int i = 0; i < 2; ++i) {
close(pipes[i]);
pipes[i] = -1;
}
return false;
} else if(pid == 0) { /* child */
dup2(pipes[PIPE_WRITE], STDOUT_FILENO);
for(int i = 0; i < 2; ++i) {
close(pipes[i]);
}
const char *args[] = { "gsr-global-hotkeys", NULL };
execvp(args[0], (char* const*)args);
perror("execvp");
_exit(127);
} else { /* parent */
process_id = pid;
close(pipes[PIPE_WRITE]);
pipes[PIPE_WRITE] = -1;
const int fdl = fcntl(pipes[PIPE_READ], F_GETFL);
fcntl(pipes[PIPE_READ], F_SETFL, fdl | O_NONBLOCK);
read_file = fdopen(pipes[PIPE_READ], "r");
if(read_file)
pipes[PIPE_READ] = -1;
else
fprintf(stderr, "fdopen failed, error: %s\n", strerror(errno));
}
return true;
}
bool GlobalHotkeysLinux::bind_action(const std::string &id, GlobalHotkeyCallback callback) {
return bound_actions_by_id.insert(std::make_pair(id, callback)).second;
}
void GlobalHotkeysLinux::poll_events() {
if(process_id <= 0) {
fprintf(stderr, "error: GlobalHotkeysLinux::poll_events failed, process has not been started yet. Use GlobalHotkeysLinux::start to start the process first\n");
return;
}
if(!read_file) {
fprintf(stderr, "error: GlobalHotkeysLinux::poll_events failed, read file hasn't opened\n");
return;
}
char buffer[256];
while(true) {
char *line = fgets(buffer, sizeof(buffer), read_file);
if(!line)
break;
const int line_len = strlen(line);
if(line_len == 0)
continue;
if(line[line_len - 1] == '\n')
line[line_len - 1] = '\0';
const std::string action = line;
auto it = bound_actions_by_id.find(action);
if(it != bound_actions_by_id.end())
it->second(action);
}
}
}
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