VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/linux/RTProcIsRunningByName-linux.cpp@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 2 years ago

Copyright year updates by scm.

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1/* $Id: RTProcIsRunningByName-linux.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - RTProcIsRunningByName, Linux implementation.
4 */
5
6/*
7 * Copyright (C) 2009-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#define LOG_GROUP RTLOGGROUP_PROCESS
42#include <iprt/process.h>
43#include <iprt/string.h>
44#include <iprt/dir.h>
45#include <iprt/path.h>
46#include <iprt/stream.h>
47#include <iprt/param.h>
48#include <iprt/assert.h>
49
50#include <unistd.h>
51
52
53RTR3DECL(bool) RTProcIsRunningByName(const char *pszName)
54{
55 /*
56 * Quick validation.
57 */
58 if (!pszName)
59 return false;
60
61 bool const fWithPath = RTPathHavePath(pszName);
62
63 /*
64 * Enumerate /proc.
65 */
66 RTDIR hDir;
67 int rc = RTDirOpen(&hDir, "/proc");
68 AssertMsgRCReturn(rc, ("RTDirOpen on /proc failed: rc=%Rrc\n", rc), false);
69 if (RT_SUCCESS(rc))
70 {
71 RTDIRENTRY DirEntry;
72 while (RT_SUCCESS(RTDirRead(hDir, &DirEntry, NULL)))
73 {
74 /*
75 * Filter numeric directory entries only.
76 */
77 if ( ( DirEntry.enmType == RTDIRENTRYTYPE_DIRECTORY
78 || DirEntry.enmType == RTDIRENTRYTYPE_UNKNOWN)
79 && RTStrToUInt32(DirEntry.szName) > 0)
80 {
81 /*
82 * Try readlink on exe first since it's more faster and reliable.
83 * Fall back on reading the first line in cmdline if that fails
84 * (access errors typically). cmdline is unreliable as it might
85 * contain whatever the execv caller passes as argv[0].
86 */
87 char szName[RTPATH_MAX];
88 RTStrPrintf(szName, sizeof(szName), "/proc/%s/exe", &DirEntry.szName[0]);
89 char szExe[RTPATH_MAX];
90 int cchLink = readlink(szName, szExe, sizeof(szExe) - 1);
91 if ( cchLink > 0
92 && (size_t)cchLink < sizeof(szExe))
93 {
94 szExe[cchLink] = '\0';
95 rc = VINF_SUCCESS;
96 }
97 else
98 {
99 RTStrPrintf(szName, sizeof(szName), "/proc/%s/cmdline", &DirEntry.szName[0]);
100 PRTSTREAM pStream;
101 rc = RTStrmOpen(szName, "r", &pStream);
102 if (RT_SUCCESS(rc))
103 {
104 rc = RTStrmGetLine(pStream, szExe, sizeof(szExe));
105 RTStrmClose(pStream);
106 }
107 }
108 if (RT_SUCCESS(rc))
109 {
110 /*
111 * We are interested on the file name part only.
112 */
113 char const *pszProcName = fWithPath ? szExe : RTPathFilename(szExe);
114 if (RTStrCmp(pszProcName, pszName) == 0)
115 {
116 /* Found it! */
117 RTDirClose(hDir);
118 return true;
119 }
120 }
121 }
122 }
123 RTDirClose(hDir);
124 }
125
126 return false;
127}
128
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