1/*
2 * Copyright (C) 2012 Samsung Electronics
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "ProcessExecutablePath.h"
28
29#include "FileSystem.h"
30#include <libgen.h>
31#include <unistd.h>
32#include <wtf/NeverDestroyed.h>
33#include <wtf/StdLibExtras.h>
34#include <wtf/text/CString.h>
35
36namespace WebKit {
37
38// We initially look for the process in WEBKIT_EXEC_PATH, then proceed to try the working
39// directory of the running process, and finally we try LIBEXECDIR (usually /usr/local/bin).
40static String findProcessPath(const char* processName)
41{
42    String executablePath;
43    static const char* execDirectory = getenv("WEBKIT_EXEC_PATH");
44    if (execDirectory) {
45        executablePath = WebCore::pathByAppendingComponent(String::fromUTF8(execDirectory), processName);
46        if (WebCore::fileExists(executablePath))
47            return executablePath;
48    }
49
50#if OS(UNIX)
51    char readLinkBuffer[PATH_MAX] = {0};
52
53#if OS(LINUX)
54    ssize_t result = readlink("/proc/self/exe", readLinkBuffer, PATH_MAX);
55#else
56    ssize_t result = readlink("/proc/curproc/file", readLinkBuffer, PATH_MAX);
57#endif
58    if (result > 0) {
59        char* executablePathPtr = dirname(readLinkBuffer);
60        executablePath = WebCore::pathByAppendingComponent(String::fromUTF8(executablePathPtr), processName);
61        if (WebCore::fileExists(executablePath))
62            return executablePath;
63    }
64#endif
65    executablePath = WebCore::pathByAppendingComponent(String(LIBEXECDIR), processName);
66    ASSERT(WebCore::fileExists(executablePath));
67    return executablePath;
68}
69
70String executablePathOfWebProcess()
71{
72    static NeverDestroyed<const String> webKitWebProcessName(findProcessPath(WEBPROCESSNAME));
73
74    return webKitWebProcessName;
75}
76
77String executablePathOfPluginProcess()
78{
79    static NeverDestroyed<const String> webKitPluginProcessName(findProcessPath(PLUGINPROCESSNAME));
80
81    return webKitPluginProcessName;
82}
83
84#if ENABLE(NETWORK_PROCESS)
85String executablePathOfNetworkProcess()
86{
87    static NeverDestroyed<const String> webKitNetworkProcessName(findProcessPath(NETWORKPROCESSNAME));
88
89    return webKitNetworkProcessName;
90}
91#endif
92
93} // namespace WebKit
94