start to track Daniel's version

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

diff --git a/src/lockfile.c b/src/lockfile.c
deleted file mode 100644 (file)
index 2fe31b2..0000000
--- a/src/lockfile.c
+++ /dev/null
@@ -1,143 +0,0 @@
-// $Id: lockfile.c 1447 2004-04-13 08:27:50Z ensc $    --*- 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 <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <stdio.h>
-#include <time.h>
-#include <sys/file.h>
-#include <sys/param.h>
-
-static void
-showHelp(char const *cmd)
-{
-  WRITE_MSG(1, "Usage:  ");
-  WRITE_STR(1, cmd);
-  WRITE_MSG(1,
-           " [--] <lockfile> <syncpipe> [<timeout>]\n\n"
-           "Protocol:\n"
-           "  1.  parent (shell) creates a named <syncpipe>\n"
-           "  2.  'lockfile' will be called\n"
-           "  3a. 'lockfile' waits until somebody opens the <syncpipe> for reading\n"
-           "  3b. parent (shell) opens the pipe for reading and blocks\n"
-           "  4.  'lockfile' calls flock() on the <lockfile>\n"
-           "  5.  'lockfile' closes the <syncpipe>\n"
-           "  6.  parent (shell) unlocks since <syncpipe> is closed\n"
-           "  7.  'lockfile' goes into infinite loop\n"
-           "  8.  parent sends SIGHUP (or other signal) to 'lockfile\n"
-           "\n"
-           "Sample code:\n"
-           "  tmp=$(mktemp /tmp/lock.XXXXXX)\n"
-           "  rm -f $tmp    # safe since mknod(2) does not follow symlinks\n"
-           "  mkfifo -m700 $tmp || exit 1\n"
-           "  lockfile $lock $tmp &\n"
-           "  $tmp\n"
-           "  ... <actions> ...\n"
-           "  kill -HUP $!  # (implicated by shell-exit)\n"
-           "\n"
-           "Please report bugs to " PACKAGE_BUGREPORT "\n");
-  exit(0);
-}
-
-static void
-showVersion()
-{
-  WRITE_MSG(1,
-           "lockfile " VERSION " -- locks a file"
-           "This program is part of " PACKAGE_STRING "\n\n"
-           "Copyright (C) 2004 Enrico Scholz\n"
-           VERSION_COPYRIGHT_DISCLAIMER);
-  exit(0);
-}
-
-static void
-alarmFunc(int UNUSED sig)
-{
-  signal(SIGALRM, alarmFunc);
-}
-
-static void
-quitFunc(int UNUSED sig)
-{
-  _exit(0);
-}
-
-int main(int argc, char *argv[])
-{
-  int                  fd, sync_fd = -1;
-  int                  idx = 1;
-  time_t               end_time;
-  pid_t const          ppid = getppid();
-
-  if (argc>=2) {
-    if (strcmp(argv[1], "--help")   ==0) showHelp(argv[0]);
-    if (strcmp(argv[1], "--version")==0) showVersion();
-    if (strcmp(argv[1], "--")       ==0) ++idx;
-  }
-
-  if (argc<idx+2) {
-    WRITE_MSG(2, "Not enough parameters; use '--help' for more information\n");
-    return EXIT_FAILURE;
-  }
-
-  end_time = time(0);
-  if (argc==idx+3) end_time += atoi(argv[idx+2]);
-  else             end_time += 300;
-                  
-  if ((sync_fd=open(argv[idx+1], O_WRONLY))==-1)
-    perror("lockfile: open(<syncpipe>)");
-  else if ((fd=open(argv[idx], O_CREAT|O_RDONLY|O_NOFOLLOW|O_NONBLOCK, 0644))==-1)
-    perror("lockfile: open(<lockfile>)");
-  else if (unlink(argv[idx+1])==-1)
-    perror("lockfile: unlink(<syncpipe>)");
-  else if (siginterrupt(SIGALRM, 1)==-1)
-    perror("lockfile: siginterrupt()");
-  else if (signal(SIGALRM, alarmFunc)==SIG_ERR ||
-          signal(SIGHUP,  quitFunc) ==SIG_ERR)
-    perror("lockfile: signal()");
-  else while (time(0)<end_time && getppid()==ppid) {
-    int                duration = end_time-time(0);
-    alarm(MIN(10, MAX(duration,1)));
-    
-    if (flock(fd,LOCK_EX)==-1) {
-      if (errno==EINTR) continue;
-      perror("lockfile: flock()");
-      break;
-    }
-    signal(SIGALRM, SIG_IGN);
-
-    WRITE_MSG(sync_fd, "#!/bin/true\n");
-    close(sync_fd);
-    while (getppid()==ppid) sleep(10);
-          
-    return EXIT_SUCCESS;
-  }
-
-  if (sync_fd!=-1)
-    WRITE_MSG(sync_fd, "#!/bin/false\n");
-  return EXIT_FAILURE;
-}