util-vserver-0.30.208

[util-vserver.git] / src / keep-ctx-alive.c

diff --git a/src/keep-ctx-alive.c b/src/keep-ctx-alive.c
new file mode 100644 (file)
index 0000000..0314881
--- /dev/null
+++ b/src/keep-ctx-alive.c
@@ -0,0 +1,194 @@
+// $Id: keep-ctx-alive.c,v 1.3 2004/12/16 00:11:01 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// 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; version 2 of the License.
+//  
+// 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.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "util.h"
+
+#include <lib/vserver.h>
+#include <lib/internal.h>
+
+#include <getopt.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/select.h>
+
+#define ENSC_WRAPPERS_PREFIX   "keep-ctx-alive: "
+#define ENSC_WRAPPERS_VSERVER  1
+#define ENSC_WRAPPERS_SOCKET   1
+#define ENSC_WRAPPERS_UNISTD   1
+#define ENSC_WRAPPERS_IOSOCK   1
+#define ENSC_WRAPPERS_IO       1
+#include <wrappers.h>
+
+
+#define CMD_HELP               0x1000
+#define CMD_VERSION            0x1001
+#define CMD_SOCKET             0x4000
+#define CMD_TIMEOUT            0x4001
+#define CMD_QUIT               0x4002
+
+int    wrapper_exit_code = 1;
+
+struct option const
+CMDLINE_OPTIONS[] = {
+  { "help",       no_argument,       0, CMD_HELP },
+  { "version",    no_argument,       0, CMD_VERSION },
+  { "socket",     required_argument, 0, CMD_SOCKET },
+  { "timeout",    required_argument, 0, CMD_TIMEOUT },
+  { "quit",       required_argument, 0, CMD_QUIT },
+  {0,0,0,0},
+};
+
+static void
+showHelp(int fd, char const *cmd, int res)
+{
+  WRITE_MSG(fd, "Usage:\n    ");
+  WRITE_STR(fd, cmd);
+  WRITE_MSG(fd,
+           " --socket <filename> [--timeout <seconds>]\n"
+           "\n"
+           "Please report bugs to " PACKAGE_BUGREPORT "\n");
+
+  exit(res);
+}
+
+static void
+showVersion()
+{
+  WRITE_MSG(1,
+           "keep-ctx-alive " VERSION " -- keeps a context alive\n"
+           "This program is part of " PACKAGE_STRING "\n\n"
+           "Copyright (C) 2004 Enrico Scholz\n"
+           VERSION_COPYRIGHT_DISCLAIMER);
+  exit(0);
+}
+
+static void
+printXid(int fd)
+{
+  xid_t                xid = Evc_get_task_xid(0);
+  char         buf[sizeof(xid)*3 + 2];
+  size_t       l;
+
+  l = utilvserver_fmt_long(buf, xid);
+  EwriteAll(fd, buf, l);
+  Eclose(fd);
+}
+
+static void handleMessage(int fd)
+{
+  char                 buf[128];
+  size_t               len;
+  struct sockaddr_un   addr;
+  socklen_t            addr_len = sizeof(addr);
+  int                  new_fd   = Eaccept(fd, &addr, &addr_len);
+
+  len = Erecv(new_fd, buf, sizeof buf,0);
+  if (len==0) exit(1);
+  
+    // TODO: handle message???
+  exit(0);
+}
+
+static int
+sendQuitSignal(char const *filename, char const *msg)
+{
+  int                  fd;
+  struct sockaddr_un   addr;
+
+  ENSC_INIT_UNIX_SOCK(addr, filename);
+  fd = Esocket(PF_UNIX, SOCK_STREAM, 0);
+  Econnect(fd, &addr, sizeof(addr));
+
+  if (msg) EsendAll(fd, msg, strlen(msg));
+  Eclose(fd);
+
+  return EXIT_SUCCESS;
+}
+
+static int
+doit(char const *filename, struct timeval *timeout)
+{
+  int                  fd;
+  struct sockaddr_un   sock;
+  pid_t                        pid;
+  fd_set               fdset;
+
+  ENSC_INIT_UNIX_SOCK(sock, filename);
+
+  fd = Esocket(PF_UNIX, SOCK_STREAM, 0);
+  Ebind(fd, &sock, sizeof sock);
+  Elisten(fd, 5);
+
+  printXid(1);
+
+  FD_ZERO(&fdset);
+  FD_SET(fd, &fdset);
+
+  pid = Efork();
+  if (pid==0) {
+    Eselect(fd+1, &fdset, 0,0, timeout);
+    if (FD_ISSET(fd, &fdset)) handleMessage(fd);
+    exit(1);
+  }
+
+  return EXIT_SUCCESS;
+}
+
+int main(int argc, char *argv[])
+{
+  char const *         socket_name = 0;
+  struct timeval       timeout = { 0,0 };
+  struct timeval       *timeout_ptr = 0;
+  char const *         quit_msg = false;
+  
+  while (1) {
+    int                c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
+    if (c==-1) break;
+
+    switch (c) {
+      case CMD_HELP            :  showHelp(1, argv[0], 0);
+      case CMD_VERSION         :  showVersion();
+      case CMD_SOCKET          :  socket_name = optarg; break;
+      case CMD_QUIT            :  quit_msg    = optarg; break;
+      case CMD_TIMEOUT         :
+       timeout.tv_sec = atoi(optarg);
+       timeout_ptr    = &timeout;
+       break;
+      default          :
+       WRITE_MSG(2, "Try '");
+       WRITE_STR(2, argv[0]);
+       WRITE_MSG(2, " --help\" for more information.\n");
+       return 255;
+       break;
+    }
+  }
+
+  if (socket_name==0)
+    WRITE_MSG(2, "reserve-context: No socketname specified\n");
+  if (quit_msg)
+    return sendQuitSignal(socket_name, quit_msg);
+  else
+    return doit(socket_name, timeout_ptr);
+
+  return EXIT_FAILURE;
+}