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
67
68
69
70
71
72
73
74
75
|
// Copyright 2011 Google Inc. All Rights Reserved.
//
// 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 "browse.h"
#include <stdio.h>
#include <unistd.h>
#include "ninja.h"
// Import browse.py as binary data.
asm(
".data\n"
"browse_data_begin:\n"
".incbin \"src/browse.py\"\n"
"browse_data_end:\n"
);
// Declare the symbols defined above.
extern const char browse_data_begin[];
extern const char browse_data_end[];
void RunBrowsePython(State* state, const char* ninja_command) {
// Fork off a Python process and have it run our code via its stdin.
// (Actually the Python process becomes the parent.)
int pipefd[2];
if (pipe(pipefd) < 0) {
perror("pipe");
return;
}
pid_t pid = fork();
if (pid < 0) {
perror("fork");
return;
}
if (pid > 0) { // Parent.
close(pipefd[1]);
do {
if (dup2(pipefd[0], 0) < 0) {
perror("dup2");
break;
}
// exec Python, telling it to run the program from stdin.
const char* command[] = {
"python", "-", ninja_command, NULL
};
execvp(command[0], (char**)command);
perror("execvp");
} while (false);
_exit(1);
} else { // Child.
close(pipefd[0]);
// Write the script file into the stdin of the Python process.
const int browse_data_len = browse_data_end - browse_data_begin;
int len = write(pipefd[1], browse_data_begin, browse_data_len);
if (len < browse_data_len)
perror("write");
close(pipefd[1]);
exit(0);
}
}
|
