Chris@47: // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
Chris@47: // Licensed under the MIT License:
Chris@47: //
Chris@47: // Permission is hereby granted, free of charge, to any person obtaining a copy
Chris@47: // of this software and associated documentation files (the "Software"), to deal
Chris@47: // in the Software without restriction, including without limitation the rights
Chris@47: // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Chris@47: // copies of the Software, and to permit persons to whom the Software is
Chris@47: // furnished to do so, subject to the following conditions:
Chris@47: //
Chris@47: // The above copyright notice and this permission notice shall be included in
Chris@47: // all copies or substantial portions of the Software.
Chris@47: //
Chris@47: // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Chris@47: // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Chris@47: // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Chris@47: // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Chris@47: // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Chris@47: // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Chris@47: // THE SOFTWARE.
Chris@47: 
Chris@47: #ifndef KJ_MINIPOSIX_H_
Chris@47: #define KJ_MINIPOSIX_H_
Chris@47: 
Chris@47: // This header provides a small subset of the POSIX API which also happens to be available on
Chris@47: // Windows under slightly-different names.
Chris@47: 
Chris@47: #if defined(__GNUC__) && !KJ_HEADER_WARNINGS
Chris@47: #pragma GCC system_header
Chris@47: #endif
Chris@47: 
Chris@47: #if _WIN32
Chris@47: #include <io.h>
Chris@47: #include <direct.h>
Chris@47: #include <fcntl.h>  // _O_BINARY
Chris@47: #else
Chris@47: #include <limits.h>
Chris@47: #include <errno.h>
Chris@47: #endif
Chris@47: 
Chris@47: #if !_WIN32 || __MINGW32__
Chris@47: #include <unistd.h>
Chris@47: #include <sys/stat.h>
Chris@47: #include <sys/types.h>
Chris@47: #endif
Chris@47: 
Chris@47: #if !_WIN32
Chris@47: #include <sys/uio.h>
Chris@47: #endif
Chris@47: 
Chris@47: namespace kj {
Chris@47: namespace miniposix {
Chris@47: 
Chris@47: #if _WIN32 && !__MINGW32__
Chris@47: // We're on Windows and not MinGW. So, we need to define wrappers for the POSIX API.
Chris@47: 
Chris@47: typedef int ssize_t;
Chris@47: 
Chris@47: inline ssize_t read(int fd, void* buffer, size_t size) {
Chris@47:   return ::_read(fd, buffer, size);
Chris@47: }
Chris@47: inline ssize_t write(int fd, const void* buffer, size_t size) {
Chris@47:   return ::_write(fd, buffer, size);
Chris@47: }
Chris@47: inline int close(int fd) {
Chris@47:   return ::_close(fd);
Chris@47: }
Chris@47: 
Chris@47: #ifndef F_OK
Chris@47: #define F_OK 0  // access() existence test
Chris@47: #endif
Chris@47: 
Chris@47: #ifndef S_ISREG
Chris@47: #define S_ISREG(mode) (((mode) & S_IFMT) ==  S_IFREG)  // stat() regular file test
Chris@47: #endif
Chris@47: #ifndef S_ISDIR
Chris@47: #define S_ISDIR(mode) (((mode) & S_IFMT) ==  S_IFDIR)  // stat() directory test
Chris@47: #endif
Chris@47: 
Chris@47: #ifndef STDIN_FILENO
Chris@47: #define STDIN_FILENO 0
Chris@47: #endif
Chris@47: #ifndef STDOUT_FILENO
Chris@47: #define STDOUT_FILENO 1
Chris@47: #endif
Chris@47: #ifndef STDERR_FILENO
Chris@47: #define STDERR_FILENO 2
Chris@47: #endif
Chris@47: 
Chris@47: #else
Chris@47: // We're on a POSIX system or MinGW which already defines the wrappers for us.
Chris@47: 
Chris@47: using ::ssize_t;
Chris@47: using ::read;
Chris@47: using ::write;
Chris@47: using ::close;
Chris@47: 
Chris@47: #endif
Chris@47: 
Chris@47: #if _WIN32
Chris@47: // We're on Windows, including MinGW. pipe() and mkdir() are non-standard even on MinGW.
Chris@47: 
Chris@47: inline int pipe(int fds[2]) {
Chris@47:   return ::_pipe(fds, 8192, _O_BINARY);
Chris@47: }
Chris@47: inline int mkdir(const char* path, int mode) {
Chris@47:   return ::_mkdir(path);
Chris@47: }
Chris@47: 
Chris@47: #else
Chris@47: // We're on real POSIX.
Chris@47: 
Chris@47: using ::pipe;
Chris@47: using ::mkdir;
Chris@47: 
Chris@47: inline size_t iovMax(size_t count) {
Chris@47:   // Apparently, there is a maximum number of iovecs allowed per call.  I don't understand why.
Chris@47:   // Most platforms define IOV_MAX but Linux defines only UIO_MAXIOV and others, like Hurd,
Chris@47:   // define neither.
Chris@47:   //
Chris@47:   // On platforms where both IOV_MAX and UIO_MAXIOV are undefined, we poke sysconf(_SC_IOV_MAX),
Chris@47:   // then try to fall back to the POSIX-mandated minimum of _XOPEN_IOV_MAX if that fails.
Chris@47:   //
Chris@47:   // http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html#tag_13_23_03_01
Chris@47: 
Chris@47: #if defined(IOV_MAX)
Chris@47:   // Solaris (and others?)
Chris@47:   return IOV_MAX;
Chris@47: #elif defined(UIO_MAXIOV)
Chris@47:   // Linux
Chris@47:   return UIO_MAXIOV;
Chris@47: #else
Chris@47:   // POSIX mystery meat
Chris@47: 
Chris@47:   long iovmax;
Chris@47: 
Chris@47:   errno = 0;
Chris@47:   if ((iovmax = sysconf(_SC_IOV_MAX)) == -1) {
Chris@47:     // assume iovmax == -1 && errno == 0 means "unbounded"
Chris@47:     return errno ? _XOPEN_IOV_MAX : count;
Chris@47:   } else {
Chris@47:     return (size_t) iovmax;
Chris@47:   }
Chris@47: #endif
Chris@47: }
Chris@47: 
Chris@47: #endif
Chris@47: 
Chris@47: }  // namespace miniposix
Chris@47: }  // namespace kj
Chris@47: 
Chris@47: #endif  // KJ_MINIPOSIX_H_