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1 | // Copyright (c) 2106 Klemens D. Morgenstern |
2 | // | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #ifndef BOOST_PROCESS_DETAIL_POSIX_IS_RUNNING_HPP | |
7 | #define BOOST_PROCESS_DETAIL_POSIX_IS_RUNNING_HPP | |
8 | ||
9 | #include <boost/process/detail/config.hpp> | |
10 | #include <boost/process/detail/posix/child_handle.hpp> | |
11 | #include <system_error> | |
12 | #include <sys/wait.h> | |
13 | ||
14 | namespace boost { namespace process { namespace detail { namespace posix { | |
15 | ||
16 | ||
17 | constexpr int still_active = 0x7F; | |
18 | static_assert(!WIFEXITED(still_active), "Internal Error"); | |
19 | ||
20 | inline bool is_running(const child_handle &p, int & exit_code) | |
21 | { | |
22 | int status; | |
23 | auto ret = ::waitpid(p.pid, &status, WNOHANG|WUNTRACED); | |
24 | ||
25 | if (ret == -1) | |
26 | { | |
27 | if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously. | |
28 | ::boost::process::detail::throw_last_error("is_running error"); | |
29 | ||
30 | return false; | |
31 | } | |
32 | else if (ret == 0) | |
33 | return true; | |
34 | else //exited | |
35 | { | |
36 | if (WIFEXITED(status)) | |
37 | exit_code = status; | |
38 | return false; | |
39 | } | |
40 | } | |
41 | ||
42 | inline bool is_running(const child_handle &p, int & exit_code, std::error_code &ec) noexcept | |
43 | { | |
44 | int status; | |
45 | auto ret = ::waitpid(p.pid, &status, WNOHANG|WUNTRACED); | |
46 | ||
47 | if (ret == -1) | |
48 | { | |
49 | if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously. | |
50 | ec = ::boost::process::detail::get_last_error(); | |
51 | return false; | |
52 | } | |
53 | else if (ret == 0) | |
54 | return true; | |
55 | else | |
56 | { | |
57 | ec.clear(); | |
58 | ||
59 | if (WIFEXITED(status)) | |
60 | exit_code = status; | |
61 | ||
62 | return false; | |
63 | } | |
64 | } | |
65 | ||
66 | inline bool is_running(int code) | |
67 | { | |
68 | return !WIFEXITED(code); | |
69 | } | |
70 | ||
71 | inline int eval_exit_status(int code) | |
72 | { | |
73 | return WEXITSTATUS(code); | |
74 | } | |
75 | ||
76 | }}}} | |
77 | ||
78 | #endif |