process-creation-posix.cpp@ 33602

Last change on this file since 33602 was 33602, checked in by vboxsync, 15 years ago
IPRT/r3/posix: Split out RTPathUserHome and the process creation APIs into separate files to avoid linker warnings on linux when linking statically.
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File size: 22.3 KB

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1	/* $Id: process-creation-posix.cpp 33602 2010-10-29 12:39:54Z vboxsync $ */
2	/** @file
3	* IPRT - Process Creation, POSIX.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.215389.xyz. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#define LOG_GROUP RTLOGGROUP_PROCESS
32	#include <unistd.h>
33	#include <stdlib.h>
34	#include <errno.h>
35	#include <sys/types.h>
36	#include <sys/stat.h>
37	#include <sys/wait.h>
38	#include <fcntl.h>
39	#include <signal.h>
40	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_SOLARIS)
41	# include <crypt.h>
42	# include <pwd.h>
43	# include <shadow.h>
44	#endif
45	#if defined(RT_OS_LINUX) \|\| defined(RT_OS_OS2)
46	/* While Solaris has posix_spawn() of course we don't want to use it as
47	* we need to have the child in a different process contract, no matter
48	* whether it is started detached or not. */
49	# define HAVE_POSIX_SPAWN 1
50	#endif
51	#ifdef HAVE_POSIX_SPAWN
52	# include <spawn.h>
53	#endif
54	#ifdef RT_OS_DARWIN
55	# include <mach-o/dyld.h>
56	#endif
57	#ifdef RT_OS_SOLARIS
58	# include <limits.h>
59	# include <sys/ctfs.h>
60	# include <sys/contract/process.h>
61	# include <libcontract.h>
62	#endif
63
64	#include <iprt/process.h>
65	#include "internal/iprt.h"
66
67	#include <iprt/assert.h>
68	#include <iprt/env.h>
69	#include <iprt/err.h>
70	#include <iprt/file.h>
71	#include <iprt/pipe.h>
72	#include <iprt/socket.h>
73	#include <iprt/string.h>
74	#include <iprt/mem.h>
75	#include "internal/process.h"
76
77
78	/**
79	* Check the credentials and return the gid/uid of user.
80	*
81	* @param pszUser username
82	* @param pszPasswd password
83	* @param gid where to store the GID of the user
84	* @param uid where to store the UID of the user
85	* @returns IPRT status code
86	*/
87	static int rtCheckCredentials(const char pszUser, const char pszPasswd, gid_t gid, uid_t uid)
88	{
89	#if defined(RT_OS_LINUX)
90	struct passwd *pw;
91
92	pw = getpwnam(pszUser);
93	if (!pw)
94	return VERR_PERMISSION_DENIED;
95
96	if (!pszPasswd)
97	pszPasswd = "";
98
99	struct spwd *spwd;
100	/* works only if /etc/shadow is accessible */
101	spwd = getspnam(pszUser);
102	if (spwd)
103	pw->pw_passwd = spwd->sp_pwdp;
104
105	/* be reentrant */
106	struct crypt_data data = (struct crypt_data)RTMemTmpAllocZ(sizeof(*data));
107	char *pszEncPasswd = crypt_r(pszPasswd, pw->pw_passwd, data);
108	if (strcmp(pszEncPasswd, pw->pw_passwd))
109	return VERR_PERMISSION_DENIED;
110	RTMemTmpFree(data);
111
112	*gid = pw->pw_gid;
113	*uid = pw->pw_uid;
114	return VINF_SUCCESS;
115
116	#elif defined(RT_OS_SOLARIS)
117	struct passwd *ppw, pw;
118	char szBuf[1024];
119
120	if (getpwnam_r(pszUser, &pw, szBuf, sizeof(szBuf), &ppw) != 0 \|\| ppw == NULL)
121	return VERR_PERMISSION_DENIED;
122
123	if (!pszPasswd)
124	pszPasswd = "";
125
126	struct spwd spwd;
127	char szPwdBuf[1024];
128	/* works only if /etc/shadow is accessible */
129	if (getspnam_r(pszUser, &spwd, szPwdBuf, sizeof(szPwdBuf)) != NULL)
130	ppw->pw_passwd = spwd.sp_pwdp;
131
132	char *pszEncPasswd = crypt(pszPasswd, ppw->pw_passwd);
133	if (strcmp(pszEncPasswd, ppw->pw_passwd))
134	return VERR_PERMISSION_DENIED;
135
136	*gid = ppw->pw_gid;
137	*uid = ppw->pw_uid;
138	return VINF_SUCCESS;
139
140	#else
141	return VERR_PERMISSION_DENIED;
142	#endif
143	}
144
145
146	#ifdef RT_OS_SOLARIS
147	/** @todo the error reporting of the Solaris process contract code could be
148	* a lot better, but essentially it is not meant to run into errors after
149	* the debugging phase. */
150	static int rtSolarisContractPreFork(void)
151	{
152	int templateFd = open64(CTFS_ROOT "/process/template", O_RDWR);
153	if (templateFd < 0)
154	return -1;
155
156	/* Set template parameters and event sets. */
157	if (ct_pr_tmpl_set_param(templateFd, CT_PR_PGRPONLY))
158	{
159	close(templateFd);
160	return -1;
161	}
162	if (ct_pr_tmpl_set_fatal(templateFd, CT_PR_EV_HWERR))
163	{
164	close(templateFd);
165	return -1;
166	}
167	if (ct_tmpl_set_critical(templateFd, 0))
168	{
169	close(templateFd);
170	return -1;
171	}
172	if (ct_tmpl_set_informative(templateFd, CT_PR_EV_HWERR))
173	{
174	close(templateFd);
175	return -1;
176	}
177
178	/* Make this the active template for the process. */
179	if (ct_tmpl_activate(templateFd))
180	{
181	close(templateFd);
182	return -1;
183	}
184
185	return templateFd;
186	}
187
188	static void rtSolarisContractPostForkChild(int templateFd)
189	{
190	if (templateFd == -1)
191	return;
192
193	/* Clear the active template. */
194	ct_tmpl_clear(templateFd);
195	close(templateFd);
196	}
197
198	static void rtSolarisContractPostForkParent(int templateFd, pid_t pid)
199	{
200	if (templateFd == -1)
201	return;
202
203	/* Clear the active template. */
204	int cleared = ct_tmpl_clear(templateFd);
205	close(templateFd);
206
207	/* If the clearing failed or the fork failed there's nothing more to do. */
208	if (cleared \|\| pid <= 0)
209	return;
210
211	/* Look up the contract which was created by this thread. */
212	int statFd = open64(CTFS_ROOT "/process/latest", O_RDONLY);
213	if (statFd == -1)
214	return;
215	ct_stathdl_t statHdl;
216	if (ct_status_read(statFd, CTD_COMMON, &statHdl))
217	{
218	close(statFd);
219	return;
220	}
221	ctid_t ctId = ct_status_get_id(statHdl);
222	ct_status_free(statHdl);
223	close(statFd);
224	if (ctId < 0)
225	return;
226
227	/* Abandon this contract we just created. */
228	char ctlPath[PATH_MAX];
229	size_t len = snprintf(ctlPath, sizeof(ctlPath),
230	CTFS_ROOT "/process/%d/ctl", ctId);
231	if (len >= sizeof(ctlPath))
232	return;
233	int ctlFd = open64(ctlPath, O_WRONLY);
234	if (statFd == -1)
235	return;
236	if (ct_ctl_abandon(ctlFd) < 0)
237	{
238	close(ctlFd);
239	return;
240	}
241	close(ctlFd);
242	}
243
244	#endif /* RT_OS_SOLARIS */
245
246
247	RTR3DECL(int) RTProcCreate(const char pszExec, const char const *papszArgs, RTENV Env, unsigned fFlags, PRTPROCESS pProcess)
248	{
249	return RTProcCreateEx(pszExec, papszArgs, Env, fFlags,
250	NULL, NULL, NULL, /* standard handles */
251	NULL /pszAsUser/, NULL /* pszPassword*/,
252	pProcess);
253	}
254
255
256	RTR3DECL(int) RTProcCreateEx(const char pszExec, const char const *papszArgs, RTENV hEnv, uint32_t fFlags,
257	PCRTHANDLE phStdIn, PCRTHANDLE phStdOut, PCRTHANDLE phStdErr, const char *pszAsUser,
258	const char *pszPassword, PRTPROCESS phProcess)
259	{
260	int rc;
261
262	/*
263	* Input validation
264	*/
265	AssertPtrReturn(pszExec, VERR_INVALID_POINTER);
266	AssertReturn(*pszExec, VERR_INVALID_PARAMETER);
267	AssertReturn(!(fFlags & ~(RTPROC_FLAGS_DETACHED \| RTPROC_FLAGS_SERVICE)), VERR_INVALID_PARAMETER);
268	AssertReturn(!(fFlags & RTPROC_FLAGS_DETACHED) \|\| !phProcess, VERR_INVALID_PARAMETER);
269	AssertReturn(hEnv != NIL_RTENV, VERR_INVALID_PARAMETER);
270	const char * const *papszEnv = RTEnvGetExecEnvP(hEnv);
271	AssertPtrReturn(papszEnv, VERR_INVALID_HANDLE);
272	AssertPtrReturn(papszArgs, VERR_INVALID_PARAMETER);
273	/** @todo search the PATH (add flag for this). */
274	AssertPtrNullReturn(pszAsUser, VERR_INVALID_POINTER);
275	AssertReturn(!pszAsUser \|\| *pszAsUser, VERR_INVALID_PARAMETER);
276	AssertReturn(!pszPassword \|\| pszAsUser, VERR_INVALID_PARAMETER);
277	AssertPtrNullReturn(pszPassword, VERR_INVALID_POINTER);
278
279	/*
280	* Get the file descriptors for the handles we've been passed.
281	*/
282	PCRTHANDLE paHandles[3] = { phStdIn, phStdOut, phStdErr };
283	int aStdFds[3] = { -1, -1, -1 };
284	for (int i = 0; i < 3; i++)
285	{
286	if (paHandles[i])
287	{
288	AssertPtrReturn(paHandles[i], VERR_INVALID_POINTER);
289	switch (paHandles[i]->enmType)
290	{
291	case RTHANDLETYPE_FILE:
292	aStdFds[i] = paHandles[i]->u.hFile != NIL_RTFILE
293	? (int)RTFileToNative(paHandles[i]->u.hFile)
294	: -2 /* close it */;
295	break;
296
297	case RTHANDLETYPE_PIPE:
298	aStdFds[i] = paHandles[i]->u.hPipe != NIL_RTPIPE
299	? (int)RTPipeToNative(paHandles[i]->u.hPipe)
300	: -2 /* close it */;
301	break;
302
303	case RTHANDLETYPE_SOCKET:
304	aStdFds[i] = paHandles[i]->u.hSocket != NIL_RTSOCKET
305	? (int)RTSocketToNative(paHandles[i]->u.hSocket)
306	: -2 /* close it */;
307	break;
308
309	default:
310	AssertMsgFailedReturn(("%d: %d\n", i, paHandles[i]->enmType), VERR_INVALID_PARAMETER);
311	}
312	/** @todo check the close-on-execness of these handles? */
313	}
314	}
315
316	for (int i = 0; i < 3; i++)
317	if (aStdFds[i] == i)
318	aStdFds[i] = -1;
319
320	for (int i = 0; i < 3; i++)
321	AssertMsgReturn(aStdFds[i] < 0 \|\| aStdFds[i] > i,
322	("%i := %i not possible because we're lazy\n", i, aStdFds[i]),
323	VERR_NOT_SUPPORTED);
324
325	/*
326	* Resolve the user id if specified.
327	*/
328	uid_t uid = ~(uid_t)0;
329	gid_t gid = ~(gid_t)0;
330	if (pszAsUser)
331	{
332	rc = rtCheckCredentials(pszAsUser, pszPassword, &gid, &uid);
333	if (RT_FAILURE(rc))
334	return rc;
335	}
336
337	/*
338	* Check for execute access to the file.
339	*/
340	if (access(pszExec, X_OK))
341	{
342	rc = RTErrConvertFromErrno(errno);
343	AssertMsgFailed(("'%s' %Rrc!\n", pszExec, rc));
344	return rc;
345	}
346
347	pid_t pid = -1;
348
349	/*
350	* Take care of detaching the process.
351	*
352	* HACK ALERT! Put the process into a new process group with pgid = pid
353	* to make sure it differs from that of the parent process to ensure that
354	* the IPRT waitpid call doesn't race anyone (read XPCOM) doing group wide
355	* waits. setsid() includes the setpgid() functionality.
356	* 2010-10-11 XPCOM no longer waits for anything, but it cannot hurt.
357	*/
358	#ifndef RT_OS_OS2
359	if (fFlags & RTPROC_FLAGS_DETACHED)
360	{
361	# ifdef RT_OS_SOLARIS
362	int templateFd = rtSolarisContractPreFork();
363	if (templateFd == -1)
364	return VERR_OPEN_FAILED;
365	# endif /* RT_OS_SOLARIS */
366	pid = fork();
367	if (!pid)
368	{
369	# ifdef RT_OS_SOLARIS
370	rtSolarisContractPostForkChild(templateFd);
371	# endif /* RT_OS_SOLARIS */
372	setsid(); /* see comment above */
373
374	pid = -1;
375	/* Child falls through to the actual spawn code below. */
376	}
377	else
378	{
379	#ifdef RT_OS_SOLARIS
380	rtSolarisContractPostForkParent(templateFd, pid);
381	#endif /* RT_OS_SOLARIS */
382	if (pid > 0)
383	{
384	/* Must wait for the temporary process to avoid a zombie. */
385	int status = 0;
386	pid_t pidChild = 0;
387
388	/* Restart if we get interrupted. */
389	do
390	{
391	pidChild = waitpid(pid, &status, 0);
392	} while ( pidChild == -1
393	&& errno == EINTR);
394
395	/* Assume that something wasn't found. No detailed info. */
396	if (status)
397	return VERR_PROCESS_NOT_FOUND;
398	if (phProcess)
399	*phProcess = 0;
400	return VINF_SUCCESS;
401	}
402	return RTErrConvertFromErrno(errno);
403	}
404	}
405	#endif
406
407	/*
408	* Spawn the child.
409	*
410	* Any spawn code MUST not execute any atexit functions if it is for a
411	* detached process. It would lead to running the atexit functions which
412	* make only sense for the parent. libORBit e.g. gets confused by multiple
413	* execution. Remember, there was only a fork() so far, and until exec()
414	* is successfully run there is nothing which would prevent doing anything
415	* silly with the (duplicated) file descriptors.
416	*/
417	#ifdef HAVE_POSIX_SPAWN
418	/** @todo OS/2: implement DETACHED (BACKGROUND stuff), see VbglR3Daemonize. */
419	if ( uid == ~(uid_t)0
420	&& gid == ~(gid_t)0)
421	{
422	/* Spawn attributes. */
423	posix_spawnattr_t Attr;
424	rc = posix_spawnattr_init(&Attr);
425	if (!rc)
426	{
427	# ifndef RT_OS_OS2 /* We don't need this on OS/2 and I don't recall if it's actually implemented. */
428	rc = posix_spawnattr_setflags(&Attr, POSIX_SPAWN_SETPGROUP);
429	Assert(rc == 0);
430	if (!rc)
431	{
432	rc = posix_spawnattr_setpgroup(&Attr, 0 /* pg == child pid */);
433	Assert(rc == 0);
434	}
435	# endif
436
437	/* File changes. */
438	posix_spawn_file_actions_t FileActions;
439	posix_spawn_file_actions_t *pFileActions = NULL;
440	if (aStdFds[0] != -1 \|\| aStdFds[1] != -1 \|\| aStdFds[2] != -1)
441	{
442	rc = posix_spawn_file_actions_init(&FileActions);
443	if (!rc)
444	{
445	pFileActions = &FileActions;
446	for (int i = 0; i < 3; i++)
447	{
448	int fd = aStdFds[i];
449	if (fd == -2)
450	rc = posix_spawn_file_actions_addclose(&FileActions, i);
451	else if (fd >= 0 && fd != i)
452	{
453	rc = posix_spawn_file_actions_adddup2(&FileActions, fd, i);
454	if (!rc)
455	{
456	for (int j = i + 1; j < 3; j++)
457	if (aStdFds[j] == fd)
458	{
459	fd = -1;
460	break;
461	}
462	if (fd >= 0)
463	rc = posix_spawn_file_actions_addclose(&FileActions, fd);
464	}
465	}
466	if (rc)
467	break;
468	}
469	}
470	}
471
472	if (!rc)
473	rc = posix_spawn(&pid, pszExec, pFileActions, &Attr, (char * const *)papszArgs,
474	(char * const *)papszEnv);
475
476	/* cleanup */
477	int rc2 = posix_spawnattr_destroy(&Attr); Assert(rc2 == 0); NOREF(rc2);
478	if (pFileActions)
479	{
480	rc2 = posix_spawn_file_actions_destroy(pFileActions);
481	Assert(rc2 == 0);
482	}
483
484	/* return on success.*/
485	if (!rc)
486	{
487	/* For a detached process this happens in the temp process, so
488	* it's not worth doing anything as this process must exit. */
489	if (fFlags & RTPROC_FLAGS_DETACHED)
490	_Exit(0);
491	if (phProcess)
492	*phProcess = pid;
493	return VINF_SUCCESS;
494	}
495	}
496	/* For a detached process this happens in the temp process, so
497	* it's not worth doing anything as this process must exit. */
498	if (fFlags & RTPROC_FLAGS_DETACHED)
499	_Exit(124);
500	}
501	else
502	#endif
503	{
504	#ifdef RT_OS_SOLARIS
505	int templateFd = rtSolarisContractPreFork();
506	if (templateFd == -1)
507	return VERR_OPEN_FAILED;
508	#endif /* RT_OS_SOLARIS */
509	pid = fork();
510	if (!pid)
511	{
512	#ifdef RT_OS_SOLARIS
513	rtSolarisContractPostForkChild(templateFd);
514	#endif /* RT_OS_SOLARIS */
515	if (!(fFlags & RTPROC_FLAGS_DETACHED))
516	setpgid(0, 0); /* see comment above */
517
518	/*
519	* Change group and user if requested.
520	*/
521	#if 1 /** @todo This needs more work, see suplib/hardening. */
522	if (gid != ~(gid_t)0)
523	{
524	if (setgid(gid))
525	{
526	if (fFlags & RTPROC_FLAGS_DETACHED)
527	_Exit(126);
528	else
529	exit(126);
530	}
531	}
532
533	if (uid != ~(uid_t)0)
534	{
535	if (setuid(uid))
536	{
537	if (fFlags & RTPROC_FLAGS_DETACHED)
538	_Exit(126);
539	else
540	exit(126);
541	}
542	}
543	#endif
544
545	/*
546	* Apply changes to the standard file descriptor and stuff.
547	*/
548	for (int i = 0; i < 3; i++)
549	{
550	int fd = aStdFds[i];
551	if (fd == -2)
552	close(i);
553	else if (fd >= 0)
554	{
555	int rc2 = dup2(fd, i);
556	if (rc2 != i)
557	{
558	if (fFlags & RTPROC_FLAGS_DETACHED)
559	_Exit(125);
560	else
561	exit(125);
562	}
563	for (int j = i + 1; j < 3; j++)
564	if (aStdFds[j] == fd)
565	{
566	fd = -1;
567	break;
568	}
569	if (fd >= 0)
570	close(fd);
571	}
572	}
573
574	/*
575	* Finally, execute the requested program.
576	*/
577	rc = execve(pszExec, (char * const )papszArgs, (char const *)papszEnv);
578	if (errno == ENOEXEC)
579	{
580	/* This can happen when trying to start a shell script without the magic #!/bin/sh */
581	RTAssertMsg2Weak("Cannot execute this binary format!\n");
582	}
583	else
584	RTAssertMsg2Weak("execve returns %d errno=%d\n", rc, errno);
585	RTAssertReleasePanic();
586	if (fFlags & RTPROC_FLAGS_DETACHED)
587	_Exit(127);
588	else
589	exit(127);
590	}
591	#ifdef RT_OS_SOLARIS
592	rtSolarisContractPostForkParent(templateFd, pid);
593	#endif /* RT_OS_SOLARIS */
594	if (pid > 0)
595	{
596	/* For a detached process this happens in the temp process, so
597	* it's not worth doing anything as this process must exit. */
598	if (fFlags & RTPROC_FLAGS_DETACHED)
599	_Exit(0);
600	if (phProcess)
601	*phProcess = pid;
602	return VINF_SUCCESS;
603	}
604	/* For a detached process this happens in the temp process, so
605	* it's not worth doing anything as this process must exit. */
606	if (fFlags & RTPROC_FLAGS_DETACHED)
607	_Exit(124);
608	return RTErrConvertFromErrno(errno);
609	}
610
611	return VERR_NOT_IMPLEMENTED;
612	}
613
614
615	RTR3DECL(int) RTProcDaemonizeUsingFork(bool fNoChDir, bool fNoClose, const char *pszPidfile)
616	{
617	/*
618	* Fork the child process in a new session and quit the parent.
619	*
620	* - fork once and create a new session (setsid). This will detach us
621	* from the controlling tty meaning that we won't receive the SIGHUP
622	* (or any other signal) sent to that session.
623	* - The SIGHUP signal is ignored because the session/parent may throw
624	* us one before we get to the setsid.
625	* - When the parent exit(0) we will become an orphan and re-parented to
626	* the init process.
627	* - Because of the sometimes unexpected semantics of assigning the
628	* controlling tty automagically when a session leader first opens a tty,
629	* we will fork() once more to get rid of the session leadership role.
630	*/
631
632	/* We start off by opening the pidfile, so that we can fail straight away
633	* if it already exists. */
634	int fdPidfile = -1;
635	if (pszPidfile != NULL)
636	{
637	/* @note the exclusive create is not guaranteed on all file
638	* systems (e.g. NFSv2) */
639	if ((fdPidfile = open(pszPidfile, O_RDWR \| O_CREAT \| O_EXCL, 0644)) == -1)
640	return RTErrConvertFromErrno(errno);
641	}
642
643	/* Ignore SIGHUP straight away. */
644	struct sigaction OldSigAct;
645	struct sigaction SigAct;
646	memset(&SigAct, 0, sizeof(SigAct));
647	SigAct.sa_handler = SIG_IGN;
648	int rcSigAct = sigaction(SIGHUP, &SigAct, &OldSigAct);
649
650	/* First fork, to become independent process. */
651	pid_t pid = fork();
652	if (pid == -1)
653	return RTErrConvertFromErrno(errno);
654	if (pid != 0)
655	{
656	/* Parent exits, no longer necessary. The child gets reparented
657	* to the init process. */
658	exit(0);
659	}
660
661	/* Create new session, fix up the standard file descriptors and the
662	* current working directory. */
663	pid_t newpgid = setsid();
664	int SavedErrno = errno;
665	if (rcSigAct != -1)
666	sigaction(SIGHUP, &OldSigAct, NULL);
667	if (newpgid == -1)
668	return RTErrConvertFromErrno(SavedErrno);
669
670	if (!fNoClose)
671	{
672	/* Open stdin(0), stdout(1) and stderr(2) as /dev/null. */
673	int fd = open("/dev/null", O_RDWR);
674	if (fd == -1) /* paranoia */
675	{
676	close(STDIN_FILENO);
677	close(STDOUT_FILENO);
678	close(STDERR_FILENO);
679	fd = open("/dev/null", O_RDWR);
680	}
681	if (fd != -1)
682	{
683	dup2(fd, STDIN_FILENO);
684	dup2(fd, STDOUT_FILENO);
685	dup2(fd, STDERR_FILENO);
686	if (fd > 2)
687	close(fd);
688	}
689	}
690
691	if (!fNoChDir)
692	{
693	int rcChdir = chdir("/");
694	}
695
696	/* Second fork to lose session leader status. */
697	pid = fork();
698	if (pid == -1)
699	return RTErrConvertFromErrno(errno);
700
701	if (pid != 0)
702	{
703	/* Write the pid file, this is done in the parent, before exiting. */
704	if (fdPidfile != -1)
705	{
706	char szBuf[256];
707	size_t cbPid = RTStrPrintf(szBuf, sizeof(szBuf), "%d\n", pid);
708	int rcWrite = write(fdPidfile, szBuf, cbPid);
709	close(fdPidfile);
710	}
711	exit(0);
712	}
713
714	return VINF_SUCCESS;
715	}
716

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source: vbox/trunk/src/VBox/Runtime/r3/posix/process-creation-posix.cpp@ 33602

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