109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
/*
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* Deskflow -- mouse and keyboard sharing utility
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* SPDX-FileCopyrightText: (C) 2025 Deskflow Developers
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* SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
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* SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
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* SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
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*/
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#include "arch/unix/ArchDaemonUnix.h"
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#include "arch/ArchException.h"
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#include "arch/unix/XArchUnix.h"
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#include "base/Log.h"
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#include <cstdlib>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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//
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// ArchDaemonUnix
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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 Deskflow 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 execSelfNonDaemonized()
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{
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extern char **NXArgv;
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char **selfArgv = NXArgv;
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setenv("_DESKFLOW_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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{
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return std::getenv("_DESKFLOW_DAEMONIZED") != nullptr;
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}
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#endif
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int ArchDaemonUnix::daemonize(const char *name, DaemonFunc const &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 ArchDaemonFailedException(errorToString(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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if (int chdirErr = chdir("/"); chdirErr)
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// NB: file logging actually isn't working at this point!
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LOG_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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if (int dupErr = dup(1); dupErr < 0) {
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// NB: file logging actually isn't working at this point!
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LOG_ERR("dup error: %i", dupErr);
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}
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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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