disobedience can stop/start a background rtp player now

[disorder] / disobedience / rtp.c

diff --git a/disobedience/rtp.c b/disobedience/rtp.c
new file mode 100644 (file)
index 0000000..a4efed5
--- /dev/null
+++ b/disobedience/rtp.c
@@ -0,0 +1,156 @@
+/*
+ * This file is part of Disobedience
+ * Copyright (C) 2007 Richard Kettlewell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+/** @file disobedience/rtp.c
+ * @brief RTP player support for Disobedience
+ */
+
+#include "disobedience.h"
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/un.h>
+
+/** @brief Path to RTP player's control socket */
+static char *rtp_socket;
+
+/** @brief Path to RTP player's logfile */
+static char *rtp_log;
+
+/** @brief Initialize @ref rtp_socket and @ref rtp_log if necessary */
+static void rtp_init(void) {
+  if(!rtp_socket) {
+    const char *home = getenv("HOME");
+    char *dir;
+
+    byte_xasprintf(&dir, "%s/.disorder", home);
+    mkdir(dir, 02700);
+    byte_xasprintf(&rtp_socket, "%s/rtp", dir);
+    byte_xasprintf(&rtp_log, "%s/rtp.log", dir);
+  }
+}
+
+/** @brief Return a connection to the RTP player's control socket */
+static FILE *rtp_connect(void) {
+  struct sockaddr_un un;
+  int fd;
+  FILE *fp;
+
+  rtp_init();
+  memset(&un, 0, sizeof un);
+  un.sun_family = AF_UNIX;
+  strcpy(un.sun_path, rtp_socket);
+  fd = xsocket(PF_UNIX, SOCK_STREAM, 0);
+  if(connect(fd, (const struct sockaddr *)&un, sizeof un) < 0) {
+    /* Connection refused just means that the player quit without deleting its
+     * socket */
+    switch(errno) {
+    case ECONNREFUSED:
+    case ENOENT:
+      break;
+    default:
+      /* Anything else may be a problem */
+      fpopup_msg(GTK_MESSAGE_ERROR, "connecting to %s: %s",
+                 rtp_socket, strerror(errno));
+      break;
+    }
+    close(fd);
+    return 0;
+  }
+  if(!(fp = fdopen(fd, "r+"))) {
+    fpopup_msg(GTK_MESSAGE_ERROR, "error calling fdopen: %s", strerror(errno));
+    close(fd);
+    return 0;
+  }
+  return fp;
+}
+
+/** @brief Return non-0 iff the RTP player is running */
+int rtp_running(void) {
+  FILE *fp = rtp_connect();
+
+  if(!fp)
+    return 0;                           /* no connection -> not running */
+  fclose(fp);                           /* connection -> running */
+  return 1;
+}
+
+/** @brief Activate the RTP player if it is not running */
+void start_rtp(void) {
+  pid_t pid;
+  int w, fd;
+
+  if(rtp_running())
+    return;                             /* already running */
+  /* double-fork so we don't have to wait() later */
+  if(!(pid = xfork())) {
+    if(setsid() < 0)
+      fatal(errno, "error calling setsid");
+    if(!(pid = xfork())) {
+      /* grandchild */
+      exitfn = _exit;
+      /* log errors and output somewhere reasonably sane.  rtp_running()
+       * will have made sure the directory exists. */
+      if((fd = open(rtp_log, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0)
+       fatal(errno, "creating %s", rtp_log);
+      if(dup2(fd, 1) < 0
+        || dup2(fd, 2) < 0)
+       fatal(errno, "dup2");
+      if(close(fd) < 0)
+       fatal(errno, "close");
+      /* We don't want to hang onto whatever stdin was */
+      if((fd = open("/dev/null", O_RDONLY)) < 0)
+        fatal(errno, "opening /dev/null");
+      if(dup2(fd, 0) < 0)
+        fatal(errno, "dup2");
+      if(close(fd) < 0)
+       fatal(errno, "close");
+      /* execute the player */
+      execlp("disorder-playrtp",
+            "disorder-playrtp", "--socket", rtp_socket, (char *)0);
+      fatal(errno, "disorder-playrtp");
+    } else {
+      /* child */
+      _exit(0);
+    }
+  } else {
+    /* parent */
+    while(waitpid(pid, &w, 0) < 0 && errno == EINTR)
+      ;
+  }
+}
+
+/** @brief Stop the RTP player if it is running */
+void stop_rtp(void) {
+  FILE *fp = rtp_connect();
+
+  if(!fp)
+    return;                             /* already stopped */
+  fprintf(fp, "stop\n");
+  fclose(fp);
+}
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/