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#include <limits.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
static void get_runtime_filepath(char *buffer, size_t buffer_size, const char *filename) {
char dir[PATH_MAX];
const char *runtime_dir = getenv("XDG_RUNTIME_DIR");
if(runtime_dir)
snprintf(dir, sizeof(dir), "%s", runtime_dir);
else
snprintf(dir, sizeof(dir), "/run/user/%d", geteuid());
if(access(dir, F_OK) != 0)
snprintf(dir, sizeof(dir), "/tmp");
snprintf(buffer, buffer_size, "%s/%s", dir, filename);
}
/* Assumes |str| size is less than 256 */
static void fifo_write_all(int file_fd, const char *str) {
char command[256];
const ssize_t command_size = snprintf(command, sizeof(command), "%s\n", str);
if(command_size >= (ssize_t)sizeof(command)) {
fprintf(stderr, "Error: command too long: %s\n", str);
return;
}
ssize_t offset = 0;
while(offset < (ssize_t)command_size) {
const ssize_t bytes_written = write(file_fd, str + offset, command_size - offset);
if(bytes_written > 0)
offset += bytes_written;
}
}
static void usage(void) {
printf("usage: gsr-ui-cli <command>\n");
printf("Run commands on the running gsr-ui instance.\n");
printf("\n");
printf("COMMANDS:\n");
printf(" toggle-show Show/hide the UI.\n");
printf(" toggle-record Start/stop recording.\n");
printf(" toggle-pause Pause/unpause recording. Only applies to regular recording.\n");
printf(" toggle-stream Start/stop streaming.\n");
printf(" toggle-replay Start/stop replay.\n");
printf(" replay-save Save replay.\n");
printf("EXAMPLES:\n");
printf(" gsr-ui-cli toggle-show\n");
printf(" gsr-ui-cli toggle-record\n");
exit(1);
}
static bool is_valid_command(const char *command) {
const char *commands[] = {
"toggle-show",
"toggle-record",
"toggle-pause",
"toggle-stream",
"toggle-replay",
"replay-save",
NULL
};
for(int i = 0; commands[i]; ++i) {
if(strcmp(command, commands[i]) == 0)
return true;
}
return false;
}
int main(int argc, char **argv) {
if(argc != 2) {
printf("Error: expected 1 argument, %d provided\n", argc - 1);
usage();
}
const char *command = argv[1];
if(strcmp(command, "-h") == 0 || strcmp(command, "--help") == 0)
usage();
if(!is_valid_command(command)) {
fprintf(stderr, "Error: invalid command: \"%s\"\n", command);
usage();
}
char fifo_filepath[PATH_MAX];
get_runtime_filepath(fifo_filepath, sizeof(fifo_filepath), "gsr-ui");
const int fifo_fd = open(fifo_filepath, O_RDWR | O_NONBLOCK);
if(fifo_fd <= 0) {
fprintf(stderr, "Error: failed to open fifo file %s. Maybe gsr-ui is not running?\n", fifo_filepath);
exit(2);
}
fifo_write_all(fifo_fd, command);
close(fifo_fd);
return 0;
}
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