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// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#pragma once
// This header provides a small subset of the POSIX API which also happens to be available on
// Windows under slightly-different names.
#if defined(__GNUC__) && !KJ_HEADER_WARNINGS
#pragma GCC system_header
#endif
#if _WIN32
#include <io.h>
#include <direct.h>
#include <fcntl.h> // _O_BINARY
#else
#include <limits.h>
#include <errno.h>
#endif
#if !_WIN32 || __MINGW32__
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#endif
#if !_WIN32
#include <sys/uio.h>
#endif
namespace kj {
namespace miniposix {
#if _WIN32 && !__MINGW32__
// We're on Windows and not MinGW. So, we need to define wrappers for the POSIX API.
typedef int ssize_t;
inline ssize_t read(int fd, void* buffer, size_t size) {
return ::_read(fd, buffer, size);
}
inline ssize_t write(int fd, const void* buffer, size_t size) {
return ::_write(fd, buffer, size);
}
inline int close(int fd) {
return ::_close(fd);
}
#ifndef F_OK
#define F_OK 0 // access() existence test
#endif
#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG) // stat() regular file test
#endif
#ifndef S_ISDIR
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR) // stat() directory test
#endif
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif
#else
// We're on a POSIX system or MinGW which already defines the wrappers for us.
using ::ssize_t;
using ::read;
using ::write;
using ::close;
#endif
#if _WIN32
// We're on Windows, including MinGW. pipe() and mkdir() are non-standard even on MinGW.
inline int pipe(int fds[2]) {
return ::_pipe(fds, 8192, _O_BINARY);
}
inline int mkdir(const char* path, int mode) {
return ::_mkdir(path);
}
#else
// We're on real POSIX.
using ::pipe;
using ::mkdir;
inline size_t iovMax(size_t count) {
// Apparently, there is a maximum number of iovecs allowed per call. I don't understand why.
// Most platforms define IOV_MAX but Linux defines only UIO_MAXIOV and others, like Hurd,
// define neither.
//
// On platforms where both IOV_MAX and UIO_MAXIOV are undefined, we poke sysconf(_SC_IOV_MAX),
// then try to fall back to the POSIX-mandated minimum of _XOPEN_IOV_MAX if that fails.
//
// http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html#tag_13_23_03_01
#if defined(IOV_MAX)
// Solaris (and others?)
return IOV_MAX;
#elif defined(UIO_MAXIOV)
// Linux
return UIO_MAXIOV;
#else
// POSIX mystery meat
long iovmax;
errno = 0;
if ((iovmax = sysconf(_SC_IOV_MAX)) == -1) {
// assume iovmax == -1 && errno == 0 means "unbounded"
return errno ? _XOPEN_IOV_MAX : count;
} else {
return (size_t) iovmax;
}
#endif
}
#endif
} // namespace miniposix
} // namespace kj