util-vserver 0.30.215.

[util-vserver.git] / src / vmemctrl.c

diff --git a/src/vmemctrl.c b/src/vmemctrl.c
new file mode 100644 (file)
index 0000000..471171c
--- /dev/null
+++ b/src/vmemctrl.c
@@ -0,0 +1,187 @@
+// $Id: vmemctrl.c 2674 2008-01-27 07:55:13Z dhozac $
+
+// Copyright (C) 2007 Daniel Hokka Zakrisson
+//  
+// 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, 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.
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "vserver.h"
+#include "util.h"
+
+#include <lib/internal.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <getopt.h>
+
+#define ENSC_WRAPPERS_PREFIX   "vmemctrl: "
+#define ENSC_WRAPPERS_VSERVER  1
+#define ENSC_WRAPPERS_UNISTD   1
+#include "wrappers.h"
+
+#define CMD_HELP       0x1000
+#define CMD_VERSION    0x1001
+
+#define CMD_SET                0x2000
+#define CMD_GET                0x2001
+
+#define CMD_XID                0x4000
+#define CMD_BADNESS    0x4001
+
+int wrapper_exit_code = 255;
+
+
+static struct option const
+CMDLINE_OPTIONS[] = {
+  { "help",     no_argument,        0, CMD_HELP },
+  { "version",  no_argument,        0, CMD_VERSION },
+  { "set",      no_argument,        0, CMD_SET },
+  { "get",      no_argument,        0, CMD_GET },
+  { "xid",      required_argument,  0, CMD_XID },
+  { "badness",  required_argument,  0, CMD_BADNESS },
+  { 0,0,0,0 }
+};
+
+struct Arguments {
+  xid_t                xid;
+  int64_t      badness;
+  bool         do_set;
+  bool         do_get;
+  uint32_t     mask;
+};
+
+static inline int
+hasArg(struct Arguments *args, uint32_t arg)
+{
+  return (args->mask & arg) == arg;
+}
+
+static void
+showHelp(int fd, char const *cmd, int res)
+{
+  WRITE_MSG(fd, "Usage:\n  ");
+  WRITE_STR(fd, cmd);
+  WRITE_MSG(fd,
+           " (--set|--get) [--xid <xid>] [--badness <OOM bias>]\n"
+           "        [--] [<command> <args>*]\n\n"
+           "Please report bugs to " PACKAGE_BUGREPORT "\n");
+
+  exit(res);
+}
+
+static void
+showVersion()
+{
+  WRITE_MSG(1,
+           "vmemctrl " VERSION " -- \n"
+           "This program is part of " PACKAGE_STRING "\n\n"
+           "Copyright (C) 2007 Daniel Hokka Zakrisson\n"
+           VERSION_COPYRIGHT_DISCLAIMER);
+  exit(0);
+}
+
+static inline void
+doset(struct Arguments *args)
+{
+  if (hasArg(args, CMD_BADNESS) &&
+      vc_set_badness(args->xid, args->badness) == -1) {
+    perror(ENSC_WRAPPERS_PREFIX "vc_set_badness()");
+    exit(wrapper_exit_code);
+  }
+}
+
+static inline void
+doget(struct Arguments *args)
+{
+  int64_t badness;
+  char buf[32];
+  size_t l;
+  if (vc_get_badness(args->xid, &badness) == -1) {
+    perror(ENSC_WRAPPERS_PREFIX "vc_get_badness()");
+    exit(wrapper_exit_code);
+  }
+  l = utilvserver_fmt_int64(buf, badness);
+  buf[l] = '\0';
+  WRITE_STR(1, buf);
+  WRITE_MSG(1, "\n");
+}
+
+int main (int argc, char *argv[])
+{
+  struct Arguments args = {
+    .do_set    = false,
+    .do_get    = false,
+    .xid       = VC_NOCTX,
+    .badness   = 0,
+    .mask      = 0,
+  };
+  
+  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_XID     :  args.xid       = Evc_xidopt2xid(optarg,true); break;
+      case CMD_SET     :  args.do_set    = true; break;
+      case CMD_GET     :  args.do_get    = true; break;
+      case CMD_BADNESS : {
+       char *endptr;
+       args.badness = strtoll(optarg, &endptr, 0);
+       if (*endptr) {
+         WRITE_MSG(2, ENSC_WRAPPERS_PREFIX "Badness '");
+         WRITE_STR(2, optarg);
+         WRITE_MSG(2, "' is not an integer\n");
+         exit(wrapper_exit_code);
+       }
+       break;
+      }
+      default          :
+       WRITE_MSG(2, "Try '");
+       WRITE_STR(2, argv[0]);
+       WRITE_MSG(2, " --help' for more information.\n");
+       exit(wrapper_exit_code);
+       break;
+    }
+    args.mask |= c;
+  }
+
+  if (args.xid == VC_NOCTX) args.xid = Evc_get_task_xid(0);
+
+  if (!args.do_set && !args.do_get) {
+    WRITE_MSG(2, "No operation specified; try '--help' for more information\n");
+    exit(wrapper_exit_code);
+  }
+  else if (((args.do_set ? 1 : 0) + (args.do_get ? 1 : 0)) > 1) {
+    WRITE_MSG(2, "Multiple operations specified; try '--help' for more information\n");
+    exit(wrapper_exit_code);
+  }
+
+  if (args.do_set)
+    doset(&args);
+  else if (args.do_get)
+    doget(&args);
+
+  if (optind != argc)
+    Eexecvp (argv[optind],argv+optind);
+  return EXIT_SUCCESS;
+}