| 1 | /* $Id: rtProcInitExePath-freebsd.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - rtProcInitName, FreeBSD.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define LOG_GROUP RTLOGGROUP_PROCESS
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| 32 | #include <sys/param.h>
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| 33 | #include <sys/sysctl.h>
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| 34 | #include <unistd.h>
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| 35 | #include <errno.h>
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| 36 | #include <dlfcn.h>
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| 37 | #include <link.h>
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| 38 |
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| 39 | #include <iprt/string.h>
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| 40 | #include <iprt/assert.h>
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| 41 | #include <iprt/errcore.h>
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| 42 | #include <iprt/path.h>
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| 43 | #include "internal/process.h"
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| 44 | #include "internal/path.h"
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| 45 |
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| 46 |
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| 47 | DECLHIDDEN(int) rtProcInitExePath(char *pszPath, size_t cchPath)
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| 48 | {
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| 49 | #ifdef KERN_PROC_PATHNAME
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| 50 | int aiName[4];
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| 51 | aiName[0] = CTL_KERN;
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| 52 | aiName[1] = KERN_PROC;
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| 53 | aiName[2] = KERN_PROC_PATHNAME; /* This was introduced in FreeBSD 6.0, thus the #ifdef above. */
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| 54 | aiName[3] = -1; /* Shorthand for the current process. */
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| 55 |
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| 56 | size_t cchExePath = cchPath;
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| 57 | if (sysctl(aiName, RT_ELEMENTS(aiName), pszPath, &cchExePath, NULL, 0) == 0)
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| 58 | {
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| 59 | const char *pszTmp;
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| 60 | int rc = rtPathFromNative(&pszTmp, pszPath, NULL);
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| 61 | AssertMsgRCReturn(rc, ("rc=%Rrc pszPath=\"%s\"\nhex: %.*Rhxs\n", rc, pszPath, cchExePath, pszPath), rc);
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| 62 | if (pszTmp != pszPath)
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| 63 | {
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| 64 | rc = RTStrCopy(pszPath, cchPath, pszTmp);
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| 65 | rtPathFreeIprt(pszTmp, pszPath);
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| 66 | }
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| 67 | return rc;
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| 68 | }
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| 69 |
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| 70 | int rc = RTErrConvertFromErrno(errno);
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| 71 | AssertMsgFailed(("rc=%Rrc errno=%d cchExePath=%d\n", rc, errno, cchExePath));
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| 72 | return rc;
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| 73 |
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| 74 | #else
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| 75 |
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| 76 | /*
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| 77 | * Read the /proc/curproc/file link, convert to native and return it.
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| 78 | */
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| 79 | int cchLink = readlink("/proc/curproc/file", pszPath, cchPath - 1);
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| 80 | if (cchLink > 0 && (size_t)cchLink <= cchPath - 1)
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| 81 | {
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| 82 | pszPath[cchLink] = '\0';
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| 83 |
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| 84 | char const *pszTmp;
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| 85 | int rc = rtPathFromNative(&pszTmp, pszPath);
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| 86 | AssertMsgRCReturn(rc, ("rc=%Rrc pszLink=\"%s\"\nhex: %.*Rhxs\n", rc, pszPath, cchLink, pszPath), rc);
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| 87 | if (pszTmp != pszPath)
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| 88 | {
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| 89 | rc = RTStrCopy(pszPath, cchPath, pszTmp);
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| 90 | rtPathFreeIprt(pszTmp);
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| 91 | }
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| 92 | return rc;
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| 93 | }
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| 94 |
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| 95 | int err = errno;
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| 96 |
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| 97 | /*
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| 98 | * Fall back on the dynamic linker since /proc is optional.
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| 99 | */
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| 100 | void *hExe = dlopen(NULL, 0);
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| 101 | if (hExe)
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| 102 | {
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| 103 | struct link_map const *pLinkMap = 0;
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| 104 | if (dlinfo(hExe, RTLD_DI_LINKMAP, &pLinkMap) == 0)
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| 105 | {
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| 106 | const char *pszImageName = pLinkMap->l_name;
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| 107 | if (*pszImageName == '/') /* this may not always be absolute, despite the docs. :-( */
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| 108 | {
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| 109 | char const *pszTmp;
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| 110 | int rc = rtPathFromNative(&pszTmp, pszImageName, NULL);
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| 111 | AssertMsgRCReturn(rc, ("rc=%Rrc pszImageName=\"%s\"\n", rc, pszImageName), rc);
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| 112 | if (pszTmp != pszPath)
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| 113 | {
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| 114 | rc = RTStrCopy(pszPath, cchPath, pszTmp);
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| 115 | rtPathFreeIprt(pszTmp, pszPath);
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| 116 | }
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| 117 | return rc;
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| 118 | }
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| 119 | /** @todo Try search the PATH for the file name or append the current
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| 120 | * directory, which ever makes sense... */
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| 121 | }
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| 122 | }
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| 123 |
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| 124 | int rc = RTErrConvertFromErrno(err);
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| 125 | AssertMsgFailed(("rc=%Rrc err=%d cchLink=%d hExe=%p\n", rc, err, cchLink, hExe));
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| 126 | return rc;
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| 127 | #endif
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| 128 | }
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| 129 |
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