Create pid file to detect if gpu-screen-recorder is already running and only allow one instance to run at once
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parent
5a4d8ce21b
commit
7228d36647
74
src/main.cpp
74
src/main.cpp
@ -27,6 +27,7 @@
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "../include/sound.hpp"
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@ -632,8 +633,16 @@ static void usage() {
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exit(1);
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}
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static sig_atomic_t started = 0;
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static sig_atomic_t running = 1;
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static sig_atomic_t save_replay = 0;
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static const char *pid_file = "/tmp/gpu-screen-recorder";
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static void term_handler(int) {
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if(started)
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unlink(pid_file);
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exit(0);
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}
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static void int_handler(int) {
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running = 0;
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@ -771,10 +780,70 @@ static void save_replay_async(AVCodecContext *video_codec_context, AVCodecContex
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});
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}
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static bool is_process_running_program(pid_t pid, const char *program_name) {
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char filepath[256];
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snprintf(filepath, sizeof(filepath), "/proc/%ld/exe", (long)pid);
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char resolved_path[PATH_MAX];
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const ssize_t resolved_path_len = readlink(filepath, resolved_path, sizeof(resolved_path) - 1);
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if(resolved_path_len == -1)
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return false;
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resolved_path[resolved_path_len] = '\0';
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const int program_name_len = strlen(program_name);
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return resolved_path_len >= program_name_len && memcmp(resolved_path + resolved_path_len - program_name_len, program_name, program_name_len) == 0;
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}
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static void handle_existing_pid_file() {
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char buffer[256];
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int fd = open(pid_file, O_RDONLY);
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if(fd == -1)
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return;
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ssize_t bytes_read = read(fd, buffer, sizeof(buffer) - 1);
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if(bytes_read < 0) {
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perror("failed to read gpu-screen-recorder pid file");
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exit(1);
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}
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buffer[bytes_read] = '\0';
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close(fd);
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long pid = 0;
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if(sscanf(buffer, "%ld %120s", &pid, buffer) == 2) {
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if(is_process_running_program(pid, "gpu-screen-recorder")) {
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fprintf(stderr, "Error: gpu-screen-recorder is already running\n");
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exit(1);
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}
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} else {
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fprintf(stderr, "Warning: gpu-screen-recorder pid file is in incorrect format, it's possible that its corrupt. Replacing file and continuing...\n");
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}
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unlink(pid_file);
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}
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static void handle_new_pid_file(const char *mode) {
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int fd = open(pid_file, O_WRONLY|O_CREAT|O_TRUNC, 0777);
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if(fd == -1) {
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perror("failed to create gpu-screen-recorder pid file");
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exit(1);
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}
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char buffer[256];
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const int buffer_size = snprintf(buffer, sizeof(buffer), "%ld %s", (long)getpid(), mode);
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if(write(fd, buffer, buffer_size) == -1) {
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perror("failed to write gpu-screen-recorder pid file");
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exit(1);
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}
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close(fd);
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}
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int main(int argc, char **argv) {
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signal(SIGTERM, term_handler);
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signal(SIGINT, int_handler);
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signal(SIGUSR1, save_replay_handler);
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handle_existing_pid_file();
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std::map<std::string, Arg> args = {
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{ "-w", Arg { nullptr, false } },
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//{ "-s", Arg { nullptr, true } },
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@ -1231,6 +1300,9 @@ int main(int argc, char **argv) {
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}, av_format_context, audio_stream, audio_frame_buf, &sound_device, audio_frame, &write_output_mutex);
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}
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handle_new_pid_file(replay_buffer_size_secs == -1 ? "record" : "replay");
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started = 1;
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bool redraw = true;
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XEvent e;
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while (running) {
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@ -1434,4 +1506,6 @@ int main(int argc, char **argv) {
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XCompositeUnredirectWindow(dpy, src_window_id, CompositeRedirectAutomatic);
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XCloseDisplay(dpy);
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}
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unlink(pid_file);
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}
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