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#include "../include/GlobalHotkeysLinux.hpp"
#include <signal.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <limits.h>
#include <string.h>
#define PIPE_READ 0
#define PIPE_WRITE 1
namespace gsr {
static const char* grab_type_to_arg(GlobalHotkeysLinux::GrabType grab_type) {
switch(grab_type) {
case GlobalHotkeysLinux::GrabType::ALL: return "--all";
case GlobalHotkeysLinux::GrabType::VIRTUAL: return "--virtual";
}
return "--all";
}
GlobalHotkeysLinux::GlobalHotkeysLinux(GrabType grab_type) : grab_type(grab_type) {
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() {
const char *grab_type_arg = grab_type_to_arg(grab_type);
const bool inside_flatpak = getenv("FLATPAK_ID") != NULL;
const char *user_homepath = getenv("HOME");
if(!user_homepath)
user_homepath = "/tmp";
char gsr_global_hotkeys_flatpak[PATH_MAX];
snprintf(gsr_global_hotkeys_flatpak, sizeof(gsr_global_hotkeys_flatpak), "%s/.local/share/gpu-screen-recorder/gsr-global-hotkeys", user_homepath);
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]);
}
if(inside_flatpak) {
const char *args[] = { "flatpak-spawn", "--host", "--", gsr_global_hotkeys_flatpak, grab_type_arg, nullptr };
execvp(args[0], (char* const*)args);
} else {
const char *args[] = { "gsr-global-hotkeys", grab_type_arg, nullptr };
execvp(args[0], (char* const*)args);
}
perror("gsr-global-hotkeys");
_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, std::move(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;
}
std::string action;
char buffer[256];
while(true) {
char *line = fgets(buffer, sizeof(buffer), read_file);
if(!line)
break;
int line_len = strlen(line);
if(line_len == 0)
continue;
if(line[line_len - 1] == '\n') {
line[line_len - 1] = '\0';
--line_len;
}
action = line;
auto it = bound_actions_by_id.find(action);
if(it != bound_actions_by_id.end())
it->second(action);
}
}
}
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