128 lines
2.9 KiB
C++
128 lines
2.9 KiB
C++
/*
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* synergy -- mouse and keyboard sharing utility
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* Copyright (C) 2002 Chris Schoeneman, Nick Bolton, Sorin Sbarnea
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file COPYING that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "CArchDaemonUnix.h"
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#include "XArchUnix.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <cstdlib>
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#include "CLog.h"
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//
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// CArchDaemonUnix
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//
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CArchDaemonUnix::CArchDaemonUnix()
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{
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// do nothing
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}
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CArchDaemonUnix::~CArchDaemonUnix()
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{
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// do nothing
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}
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#ifdef __APPLE__
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// In Mac OS X, fork()'d child processes can't use most APIs (the frameworks
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// that Synergy uses in fact prevent it and make the process just up and die),
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// so need to exec a copy of the program that doesn't fork so isn't limited.
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int
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execSelfNonDaemonized()
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{
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extern char** NXArgv;
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char** selfArgv = NXArgv;
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setenv("_SYNERGY_DAEMONIZED", "", 1);
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execvp(selfArgv[0], selfArgv);
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return 0;
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}
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bool alreadyDaemonized() {
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return getenv("_SYNERGY_DAEMONIZED") != NULL;
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}
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#endif
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int
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CArchDaemonUnix::daemonize(const char* name, DaemonFunc func)
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{
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#ifdef __APPLE__
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if (alreadyDaemonized())
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return func(1, &name);
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#endif
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// fork so shell thinks we're done and so we're not a process
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// group leader
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switch (fork()) {
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case -1:
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// failed
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throw XArchDaemonFailed(new XArchEvalUnix(errno));
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case 0:
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// child
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break;
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default:
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// parent exits
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exit(0);
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}
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// become leader of a new session
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setsid();
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#ifndef __APPLE__
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// NB: don't run chdir on apple; causes strange behaviour.
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// chdir to root so we don't keep mounted filesystems points busy
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// TODO: this is a bit of a hack - can we find a better solution?
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int chdirErr = chdir("/");
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if (chdirErr)
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// NB: file logging actually isn't working at this point!
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LOG((CLOG_ERR "chdir error: %i", chdirErr));
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#endif
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// mask off permissions for any but owner
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umask(077);
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// close open files. we only expect stdin, stdout, stderr to be open.
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close(0);
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close(1);
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close(2);
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// attach file descriptors 0, 1, 2 to /dev/null so inadvertent use
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// of standard I/O safely goes in the bit bucket.
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open("/dev/null", O_RDONLY);
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open("/dev/null", O_RDWR);
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int dupErr = dup(1);
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if (dupErr)
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// NB: file logging actually isn't working at this point!
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LOG((CLOG_ERR "dup error: %i", dupErr));
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#ifdef __APPLE__
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return execSelfNonDaemonized();
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#endif
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// invoke function
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return func(1, &name);
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}
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