comparison osx/include/kj/miniposix.h @ 134:41e769c91eca

Add Capnp and KJ builds for OSX

+// 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.
+
+#ifndef KJ_MINIPOSIX_H_
+#define KJ_MINIPOSIX_H_
+
+// 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
+
+#endif  // KJ_MINIPOSIX_H_