add in basic support for pidfiles

(patch courtesy aaron turner)


svn:r565

src/or/config.c

@@ -153,6 +153,7 @@ static void config_assign(or_options_t *options, struct config_line *list) {
     config_compare(list, "LogLevel",       CONFIG_TYPE_STRING, &options->LogLevel) ||
     config_compare(list, "DataDirectory",  CONFIG_TYPE_STRING, &options->DataDirectory) ||
     config_compare(list, "RouterFile",     CONFIG_TYPE_STRING, &options->RouterFile) ||
+    config_compare(list, "PidFile",        CONFIG_TYPE_STRING, &options->PidFile) ||
     config_compare(list, "Nickname",       CONFIG_TYPE_STRING, &options->Nickname) ||
     config_compare(list, "Address",        CONFIG_TYPE_STRING, &options->Address) ||
     config_compare(list, "ExitPolicy",     CONFIG_TYPE_STRING, &options->ExitPolicy) ||
@@ -201,6 +202,7 @@ int getconfig(int argc, char **argv, or_options_t *options) {
   options->LogLevel = "info";
   options->ExitPolicy = "reject 127.0.0.1:*,reject 18.244.0.188:25,accept *:*";
   options->loglevel = LOG_DEBUG;
+  options->PidFile = "tor.pid";
   options->DataDirectory = NULL;
   options->CoinWeight = 0.1;
   options->MaxConn = 900;

src/or/main.c

@@ -637,6 +637,9 @@ static void catch(int the_signal) {
     case SIGTERM:
     case SIGINT:
       log(LOG_ERR,"Catching signal %d, exiting cleanly.", the_signal);
+      /* we don't care if there was an error when we unlink,
+         nothing we could do about it anyways */
+      unlink(options.PidFile);
       exit(0);
     case SIGHUP:
       please_reset = 1;
@@ -724,6 +727,18 @@ void daemonize(void) {
 #endif
 }
 
+void write_pidfile(char *filename) {
+  FILE *pidfile;
+
+  if ((pidfile = fopen(filename, "w")) == NULL) {
+    log_fn(LOG_WARNING, "unable to open %s for writing: %s", filename,
+           strerror(errno));
+  } else {
+    fprintf(pidfile, "%d", getpid());
+    fclose(pidfile);
+  }
+}
+
 int tor_main(int argc, char *argv[]) {
 
   if(getconfig(argc,argv,&options)) {
@@ -734,6 +749,9 @@ int tor_main(int argc, char *argv[]) {
   global_read_bucket = options.TotalBandwidth; /* start it at 1 second of traffic */
   stats_prev_global_read_bucket = global_read_bucket;
 
+  /* write our pid to the pid file */
+  write_pidfile(options.PidFile);
+
   if(options.Daemon)
     daemonize();
 

src/or/or.h

@@ -421,6 +421,7 @@ typedef struct {
    char *RouterFile;
    char *Nickname;
    char *Address;
+   char *PidFile;
    char *ExitPolicy;
    double CoinWeight;
    int Daemon;