1 | // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors |
2 | // Licensed under the MIT License: |
3 | // |
4 | // Permission is hereby granted, free of charge, to any person obtaining a copy |
5 | // of this software and associated documentation files (the "Software"), to deal |
6 | // in the Software without restriction, including without limitation the rights |
7 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
8 | // copies of the Software, and to permit persons to whom the Software is |
9 | // furnished to do so, subject to the following conditions: |
10 | // |
11 | // The above copyright notice and this permission notice shall be included in |
12 | // all copies or substantial portions of the Software. |
13 | // |
14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
15 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
16 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
17 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
18 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
19 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
20 | // THE SOFTWARE. |
21 | |
22 | #pragma once |
23 | |
24 | // This header provides a small subset of the POSIX API which also happens to be available on |
25 | // Windows under slightly-different names. |
26 | |
27 | #if defined(__GNUC__) && !KJ_HEADER_WARNINGS |
28 | #pragma GCC system_header |
29 | #endif |
30 | |
31 | #if _WIN32 |
32 | #include <io.h> |
33 | #include <direct.h> |
34 | #include <fcntl.h> // _O_BINARY |
35 | #else |
36 | #include <limits.h> |
37 | #include <errno.h> |
38 | #endif |
39 | |
40 | #if !_WIN32 || __MINGW32__ |
41 | #include <unistd.h> |
42 | #include <sys/stat.h> |
43 | #include <sys/types.h> |
44 | #endif |
45 | |
46 | #if !_WIN32 |
47 | #include <sys/uio.h> |
48 | #endif |
49 | |
50 | namespace kj { |
51 | namespace miniposix { |
52 | |
53 | #if _WIN32 && !__MINGW32__ |
54 | // We're on Windows and not MinGW. So, we need to define wrappers for the POSIX API. |
55 | |
56 | typedef int ssize_t; |
57 | |
58 | inline ssize_t read(int fd, void* buffer, size_t size) { |
59 | return ::_read(fd, buffer, size); |
60 | } |
61 | inline ssize_t write(int fd, const void* buffer, size_t size) { |
62 | return ::_write(fd, buffer, size); |
63 | } |
64 | inline int close(int fd) { |
65 | return ::_close(fd); |
66 | } |
67 | |
68 | #ifndef F_OK |
69 | #define F_OK 0 // access() existence test |
70 | #endif |
71 | |
72 | #ifndef S_ISREG |
73 | #define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG) // stat() regular file test |
74 | #endif |
75 | #ifndef S_ISDIR |
76 | #define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR) // stat() directory test |
77 | #endif |
78 | |
79 | #ifndef STDIN_FILENO |
80 | #define STDIN_FILENO 0 |
81 | #endif |
82 | #ifndef STDOUT_FILENO |
83 | #define STDOUT_FILENO 1 |
84 | #endif |
85 | #ifndef STDERR_FILENO |
86 | #define STDERR_FILENO 2 |
87 | #endif |
88 | |
89 | #else |
90 | // We're on a POSIX system or MinGW which already defines the wrappers for us. |
91 | |
92 | using ::ssize_t; |
93 | using ::read; |
94 | using ::write; |
95 | using ::close; |
96 | |
97 | #endif |
98 | |
99 | #if _WIN32 |
100 | // We're on Windows, including MinGW. pipe() and mkdir() are non-standard even on MinGW. |
101 | |
102 | inline int pipe(int fds[2]) { |
103 | return ::_pipe(fds, 8192, _O_BINARY | _O_NOINHERIT); |
104 | } |
105 | inline int mkdir(const char* path, int mode) { |
106 | return ::_mkdir(path); |
107 | } |
108 | |
109 | #else |
110 | // We're on real POSIX. |
111 | |
112 | using ::pipe; |
113 | using ::mkdir; |
114 | |
115 | inline size_t iovMax(size_t count) { |
116 | // Apparently, there is a maximum number of iovecs allowed per call. I don't understand why. |
117 | // Most platforms define IOV_MAX but Linux defines only UIO_MAXIOV and others, like Hurd, |
118 | // define neither. |
119 | // |
120 | // On platforms where both IOV_MAX and UIO_MAXIOV are undefined, we poke sysconf(_SC_IOV_MAX), |
121 | // then try to fall back to the POSIX-mandated minimum of _XOPEN_IOV_MAX if that fails. |
122 | // |
123 | // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html#tag_13_23_03_01 |
124 | |
125 | #if defined(IOV_MAX) |
126 | // Solaris (and others?) |
127 | return IOV_MAX; |
128 | #elif defined(UIO_MAXIOV) |
129 | // Linux |
130 | return UIO_MAXIOV; |
131 | #else |
132 | // POSIX mystery meat |
133 | |
134 | long iovmax; |
135 | |
136 | errno = 0; |
137 | if ((iovmax = sysconf(_SC_IOV_MAX)) == -1) { |
138 | // assume iovmax == -1 && errno == 0 means "unbounded" |
139 | return errno ? _XOPEN_IOV_MAX : count; |
140 | } else { |
141 | return (size_t) iovmax; |
142 | } |
143 | #endif |
144 | } |
145 | |
146 | #endif |
147 | |
148 | } // namespace miniposix |
149 | } // namespace kj |
150 | |