Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 254 insertions, 0 deletions

diff --git a/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR3LibDaemonize.cpp b/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR3LibDaemonize.cpp
new file mode 100644
index 00000000..f31ebc15
--- /dev/null
+++ b/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR3LibDaemonize.cpp
@@ -0,0 +1,254 @@
+/** $Id: VBoxGuestR3LibDaemonize.cpp $ */
+/** @file
+ * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, daemonize a process.
+ */
+
+/*
+ * Copyright (C) 2007-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#if defined(RT_OS_OS2)
+# define INCL_BASE
+# define INCL_ERRORS
+# include <os2.h>
+
+# include <iprt/alloca.h>
+# include <iprt/string.h>
+
+#elif defined(RT_OS_WINDOWS)
+# error "PORTME"
+
+#else /* the unices */
+# include <sys/types.h>
+# include <sys/stat.h>
+# include <sys/wait.h>
+# include <stdio.h>
+# include <fcntl.h>
+# include <stdlib.h>
+# include <unistd.h>
+# include <signal.h>
+# include <errno.h>
+#endif
+
+#include <iprt/process.h>
+#include <iprt/string.h>
+#include "VBoxGuestR3LibInternal.h"
+
+
+/**
+ * Daemonize the process for running in the background.
+ *
+ * This is supposed to do the same job as the BSD daemon() call.
+ *
+ * @returns 0 on success
+ *
+ * @param   fNoChDir    Pass false to change working directory to root.
+ * @param   fNoClose    Pass false to redirect standard file streams to /dev/null.
+ * @param   fRespawn    Restart the daemonised process after five seconds if it
+ *                      terminates abnormally.
+ * @param   pcRespawn   Where to store a count of how often we have respawned,
+ *                      intended for avoiding error spamming.  Optional.
+ *
+ * @todo    Use RTProcDaemonize instead of this.
+ * @todo    Implement fRespawn on OS/2.
+ * @todo    Make the respawn interval configurable.  But not until someone
+ *          actually needs that.
+ */
+VBGLR3DECL(int) VbglR3Daemonize(bool fNoChDir, bool fNoClose, bool fRespawn, unsigned *pcRespawn)
+{
+#if defined(RT_OS_OS2)
+    PPIB pPib;
+    PTIB pTib;
+    DosGetInfoBlocks(&pTib, &pPib);
+
+    AssertRelease(!fRespawn);
+    /* Get the full path to the executable. */
+    char szExe[CCHMAXPATH];
+    APIRET rc = DosQueryModuleName(pPib->pib_hmte, sizeof(szExe), szExe);
+    if (rc)
+        return RTErrConvertFromOS2(rc);
+
+    /* calc the length of the command line. */
+    char *pch = pPib->pib_pchcmd;
+    size_t cch0 = strlen(pch);
+    pch += cch0 + 1;
+    size_t cch1 = strlen(pch);
+    pch += cch1 + 1;
+    char *pchArgs;
+    if (cch1 && *pch)
+    {
+        do  pch = strchr(pch, '\0') + 1;
+        while (*pch);
+
+        size_t cchTotal = pch - pPib->pib_pchcmd;
+        pchArgs = (char *)alloca(cchTotal + sizeof("--daemonized\0\0"));
+        memcpy(pchArgs, pPib->pib_pchcmd, cchTotal - 1);
+        memcpy(pchArgs + cchTotal - 1, "--daemonized\0\0", sizeof("--daemonized\0\0"));
+    }
+    else
+    {
+        size_t cchTotal = pch - pPib->pib_pchcmd + 1;
+        pchArgs = (char *)alloca(cchTotal + sizeof(" --daemonized "));
+        memcpy(pchArgs, pPib->pib_pchcmd, cch0 + 1);
+        pch = pchArgs + cch0 + 1;
+        memcpy(pch, " --daemonized ", sizeof(" --daemonized ") - 1);
+        pch += sizeof(" --daemonized ") - 1;
+        if (cch1)
+            memcpy(pch, pPib->pib_pchcmd + cch0 + 1, cch1 + 2);
+        else
+            pch[0] = pch[1] = '\0';
+    }
+
+    /* spawn a detach process  */
+    char szObj[128];
+    RESULTCODES ResCodes = { 0, 0 };
+    szObj[0] = '\0';
+    rc = DosExecPgm(szObj, sizeof(szObj), EXEC_BACKGROUND, (PCSZ)pchArgs, NULL, &ResCodes, (PCSZ)szExe);
+    if (rc)
+    {
+        /** @todo Change this to some standard log/print error?? */
+        /* VBoxServiceError("DosExecPgm failed with rc=%d and szObj='%s'\n", rc, szObj); */
+        return RTErrConvertFromOS2(rc);
+    }
+    DosExit(EXIT_PROCESS, 0);
+    return VERR_GENERAL_FAILURE;
+
+#elif defined(RT_OS_WINDOWS)
+# error "PORTME"
+
+#else /* the unices */
+    /*
+     * Fork the child process in a new session and quit the parent.
+     *
+     * - fork once and create a new session (setsid). This will detach us
+     *   from the controlling tty meaning that we won't receive the SIGHUP
+     *   (or any other signal) sent to that session.
+     * - The SIGHUP signal is ignored because the session/parent may throw
+     *   us one before we get to the setsid.
+     * - When the parent exit(0) we will become an orphan and re-parented to
+     *   the init process.
+     * - Because of the Linux / System V semantics of assigning the controlling
+     *   tty automagically when a session leader first opens a tty, we will
+     *   fork() once more on Linux to get rid of the session leadership role.
+     */
+
+    struct sigaction OldSigAct;
+    struct sigaction SigAct;
+    RT_ZERO(SigAct);
+    SigAct.sa_handler = SIG_IGN;
+    int rcSigAct = sigaction(SIGHUP, &SigAct, &OldSigAct);
+
+    pid_t pid = fork();
+    if (pid == -1)
+        return RTErrConvertFromErrno(errno);
+    if (pid != 0)
+        exit(0);
+
+    /*
+     * The orphaned child becomes is reparented to the init process.
+     * We create a new session for it (setsid), point the standard
+     * file descriptors to /dev/null, and change to the root directory.
+     */
+    pid_t newpgid = setsid();
+    int SavedErrno = errno;
+    if (rcSigAct != -1)
+        sigaction(SIGHUP, &OldSigAct, NULL);
+    if (newpgid == -1)
+        return RTErrConvertFromErrno(SavedErrno);
+
+    if (!fNoClose)
+    {
+        /* Open stdin(0), stdout(1) and stderr(2) as /dev/null. */
+        int fd = open("/dev/null", O_RDWR);
+        if (fd == -1) /* paranoia */
+        {
+            close(STDIN_FILENO);
+            close(STDOUT_FILENO);
+            close(STDERR_FILENO);
+            fd = open("/dev/null", O_RDWR);
+        }
+        if (fd != -1)
+        {
+            dup2(fd, STDIN_FILENO);
+            dup2(fd, STDOUT_FILENO);
+            dup2(fd, STDERR_FILENO);
+            if (fd > 2)
+                close(fd);
+        }
+    }
+
+    if (!fNoChDir)
+    {
+        int rcShutUpGcc = chdir("/");
+        RT_NOREF_PV(rcShutUpGcc);
+    }
+
+    /*
+     * Change the umask - this is non-standard daemon() behavior.
+     */
+    umask(027);
+
+# ifdef RT_OS_LINUX
+    /*
+     * And fork again to lose session leader status (non-standard daemon()
+     * behaviour).
+     */
+    pid = fork();
+    if (pid == -1)
+        return RTErrConvertFromErrno(errno);
+    if (pid != 0)
+        exit(0);
+# endif /* RT_OS_LINUX */
+
+    if (fRespawn)
+    {
+        /* We implement re-spawning as a third fork(), with the parent process
+         * monitoring the child and re-starting it after a delay if it exits
+         * abnormally. */
+        unsigned cRespawn = 0;
+        for (;;)
+        {
+            int iStatus, rcWait;
+
+            if (pcRespawn != NULL)
+                *pcRespawn = cRespawn;
+            pid = fork();
+            if (pid == -1)
+                return RTErrConvertFromErrno(errno);
+            if (pid == 0)
+                return VINF_SUCCESS;
+            do
+                rcWait = waitpid(pid, &iStatus, 0);
+            while (rcWait == -1 && errno == EINTR);
+            if (rcWait == -1)
+                exit(1);
+            if (WIFEXITED(iStatus) && WEXITSTATUS(iStatus) == 0)
+                exit(0);
+            sleep(5);
+            ++cRespawn;
+        }
+    }
+    return VINF_SUCCESS;
+#endif
+}