1 /*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #ifndef LIBPANDABASE_OS_UNIX_EXEC_H
17 #define LIBPANDABASE_OS_UNIX_EXEC_H
18
19 #include <array>
20 #include "sys/wait.h"
21 #include <unistd.h>
22
23 #include "libpandabase/macros.h"
24 #include "libpandabase/os/error.h"
25 #include "libpandabase/os/failure_retry.h"
26 #include "libpandabase/utils/expected.h"
27 #include "libpandabase/utils/span.h"
28
29 namespace ark::os::exec {
30
31 template <typename Callback>
ExecWithCallbackNoWait(Callback callback,Span<const char * > args)32 Expected<int, Error> ExecWithCallbackNoWait(Callback callback, Span<const char *> args)
33 {
34 ASSERT(!args.Empty());
35 ASSERT_PRINT(args[args.Size() - 1] == nullptr, "Last argument must be a nullptr");
36
37 if (pid_t pid = fork(); pid == 0) {
38 callback();
39 setpgid(0, 0);
40 execv(args[0], const_cast<char **>(args.Data()));
41 _exit(1);
42 } else if (pid < 0) {
43 return Unexpected(Error(errno));
44 } else {
45 return pid;
46 }
47 }
48
49 template <typename Callback>
ExecWithCallback(Callback callback,Span<const char * > args)50 Expected<int, Error> ExecWithCallback(Callback callback, Span<const char *> args)
51 {
52 auto res = ExecWithCallbackNoWait(callback, args);
53 if (!res.HasValue()) {
54 return res;
55 }
56 pid_t pid = res.Value();
57
58 int status = -1;
59 pid_t resPid = PANDA_FAILURE_RETRY(waitpid(pid, &status, 0));
60 if (resPid != pid) {
61 return Unexpected(Error(errno));
62 }
63 if (WIFEXITED(status)) { // NOLINT(hicpp-signed-bitwise)
64 return WEXITSTATUS(status); // NOLINT(hicpp-signed-bitwise)
65 }
66 return Unexpected(Error("Process finished improperly"));
67 }
68
69 } // namespace ark::os::exec
70
71 #endif // LIBPANDABASE_OS_EXEC_H