1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*
* Copyright 2020, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cstdio>
#include <cstdlib>
#include <string>
#include <vector>
#include <unistd.h>
int main(int argc, const char **argv) {
// Create a copy of argv strings that we can modify, and then eventually
// const_cast away the const-ness of the buffers to call execv().
std::vector<std::unique_ptr<std::string>> argv_strings;
std::vector<const char *> argv_chars;
// Replace lld.exe with lld-bin\lld.exe instead on Windows.
argv_strings.push_back(std::make_unique<std::string>(argv[0]));
size_t idx = argv_strings[0]->rfind("lld.exe");
argv_strings[0]->insert(idx, "lld-bin\\");
argv_chars.push_back(argv_strings[0]->c_str());
// Make a copy of every other argv entry, and map a pointer to the C string
// buffer as argv_chars for use with execv() later.
for (int i = 1; i < argc; ++i) {
argv_strings.push_back(std::make_unique<std::string>(argv[i]));
argv_chars.push_back(argv_strings[i]->c_str());
}
// execv() expects a nullptr to terminate the argument list for argv.
argv_chars.push_back(nullptr);
// We cast away the const-ness of the char buffers, but it should be safe,
// since we own these strings.
int status = execv(argv_chars[0], const_cast<char **>(argv_chars.data()));
// We shouldn't get here unless we failed to execute the new binary.
if (status != 0) {
std::string command;
bool first = true;
for (auto arg : argv_chars) {
if (arg) {
if (!first) {
command.append(" ");
} else {
first = false;
}
command.append(arg);
}
}
fprintf(stderr, "Failed to execute command: %s\n", command.c_str());
}
return status;
}
|
