restore '-d' (daemonise) flag

common.h

@@ -24,6 +24,7 @@ typedef struct {
  char *output_name;
  audio_output *output;
  int buffer_start_fill;
+ int daemonise;
 } shairport_cfg;
 
 extern int debuglev;

rtsp.c

@@ -758,6 +758,14 @@ void rtsp_listen_loop(void) {
 
  mdns_register();
 
+ if (config.daemonise) {
+ pid_t pid = fork();
+ if (pid) {
+ printf("%d\n", pid);
+ exit(0);
+ }
+ }
+
  printf("Listening for connections.\n");
 
  int acceptfd;

shairport.c

@@ -59,6 +59,8 @@ void usage(char *progname) {
  " -o output set audio output\n"
  " -b fill set how full the buffer must be before audio output starts\n"
  " This value is in frames; default %d\n"
+ " -d fork (daemonise)\n"
+ " The PID of the child process is written to stdout\n"
  "Run %s -o <output> -h to find the available options for a specific output\n"
  "\n", config.buffer_start_fill, progname);
 
@@ -74,13 +76,16 @@ void usage(char *progname) {
 
 int parse_options(int argc, char **argv) {
  int opt;
- while ((opt = getopt(argc, argv, "+hvp:a:o:b:")) > 0) {
+ while ((opt = getopt(argc, argv, "+hdvp:a:o:b:")) > 0) {
  switch (opt) {
  default:
  printf("Unknown argument -%c\n", optopt);
  case 'h':
  usage(argv[0]);
  exit(1);
+ case 'd':
+ config.daemonise = 1;
+ break;
  case 'v':
  debuglev++;
  break;