barrier/lib/arch/CArchDaemonUnix.cpp

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/*
* synergy -- mouse and keyboard sharing utility
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file COPYING that should have accompanied this file.
*
* This package 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.
*/
#include "CArchDaemonUnix.h"
#include "XArchUnix.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
//
// CArchDaemonUnix
//
CArchDaemonUnix::CArchDaemonUnix()
{
// do nothing
}
CArchDaemonUnix::~CArchDaemonUnix()
{
// do nothing
}
int
CArchDaemonUnix::daemonize(const char* name, DaemonFunc func)
{
// fork so shell thinks we're done and so we're not a process
// group leader
switch (fork()) {
case -1:
// failed
throw XArchDaemonFailed(new XArchEvalUnix(errno));
case 0:
// child
break;
default:
// parent exits
exit(0);
}
// become leader of a new session
setsid();
// chdir to root so we don't keep mounted filesystems points busy
chdir("/");
// mask off permissions for any but owner
umask(077);
// close open files. we only expect stdin, stdout, stderr to be open.
close(0);
close(1);
close(2);
// attach file descriptors 0, 1, 2 to /dev/null so inadvertent use
// of standard I/O safely goes in the bit bucket.
open("/dev/null", O_RDONLY);
open("/dev/null", O_RDWR);
dup(1);
// invoke function
return func(1, &name);
}