--- /dev/null
+// $Id: vshelper-sync.c,v 1.5 2005/05/05 09:21:21 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 <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <assert.h>
+
+static void
+showHelp(int fd, char const *cmd, int res)
+{
+ WRITE_MSG(fd, "Usage: ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " [--] <pipe> <timeout>\n\n"
+ "Please report bugs to " PACKAGE_BUGREPORT "\n");
+ exit(res);
+}
+
+static void
+showVersion()
+{
+ WRITE_MSG(1,
+ "vshelper-sync " VERSION " -- waits for data from a pipe"
+ "This program is part of " PACKAGE_STRING "\n\n"
+ "Copyright (C) 2004 Enrico Scholz\n"
+ VERSION_COPYRIGHT_DISCLAIMER);
+ exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+ int fd;
+ int idx = 1;
+ struct timeval timeout;
+
+ if (argc>=2) {
+ if (strcmp(argv[1], "--help") ==0) showHelp(1, argv[0], 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;
+ }
+
+ fd = open(argv[idx], O_RDONLY|O_NONBLOCK, 0);
+ if (fd==-1) {
+ perror("vshelper-sync: open()");
+ return EXIT_FAILURE;
+ }
+
+ timeout.tv_sec = atoi(argv[idx+1]);
+ timeout.tv_usec = 0;
+
+ for (;;) {
+ char buf[512];
+ ssize_t len;
+ fd_set fds;
+
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+
+#ifndef __linux__
+# error vshelper relies on the Linux select() behavior (timeout holds remaining time)
+#endif
+
+ switch (select(fd+1, &fds, 0,0, &timeout)) {
+ case 0 : return EXIT_FAILURE; // timeout
+ case -1 :
+ perror("vshelper: select()");
+ return EXIT_FAILURE;
+ default : break;
+ }
+
+ assert(FD_ISSET(fd, &fds));
+
+ len = read(fd,buf,sizeof buf);
+ if (len==0) break;
+ if (len==-1) {
+ perror("vshelper-sync: read()");
+ return EXIT_FAILURE;
+ }
+ }
+
+ return EXIT_SUCCESS;
+}