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// 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <vector>
#include "build/browse_py.h"
void RunBrowsePython(State* state, const char* ninja_command,
const char* input_file, int argc, char* argv[]) {
// 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("ninja: pipe");
return;
}
pid_t pid = fork();
if (pid < 0) {
perror("ninja: fork");
return;
}
if (pid > 0) { // Parent.
close(pipefd[1]);
do {
if (dup2(pipefd[0], 0) < 0) {
perror("ninja: dup2");
break;
}
std::vector<const char *> command;
command.push_back(NINJA_PYTHON);
command.push_back("-");
command.push_back("--ninja-command");
command.push_back(ninja_command);
command.push_back("-f");
command.push_back(input_file);
for (int i = 0; i < argc; i++) {
command.push_back(argv[i]);
}
command.push_back(NULL);
execvp(command[0], (char**)&command[0]);
if (errno == ENOENT) {
printf("ninja: %s is required for the browse tool\n", NINJA_PYTHON);
} else {
perror("ninja: execvp");
}
} while (false);
_exit(1);
} else { // Child.
close(pipefd[0]);
// Write the script file into the stdin of the Python process.
// Only write n - 1 bytes, because Python 3.11 does not allow null
// bytes in source code anymore, so avoid writing the null string
// terminator.
// See https://github.com/python/cpython/issues/96670
auto kBrowsePyLength = sizeof(kBrowsePy) - 1;
ssize_t len = write(pipefd[1], kBrowsePy, kBrowsePyLength);
if (len < (ssize_t)kBrowsePyLength)
perror("ninja: write");
close(pipefd[1]);
exit(0);
}
}
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