src/platforms: move all headers to platforms/common/include/px4_platform_common

and remove the px4_ prefix, except for px4_config.h.

command to update includes:
for k in app.h atomic.h cli.h console_buffer.h defines.h getopt.h i2c.h init.h log.h micro_hal.h module.h module_params.h param.h param_macros.h posix.h sem.h sem.hpp shmem.h shutdown.h tasks.h time.h workqueue.h; do for i in $(grep -rl 'include <px4_'$k src platforms boards); do sed -i 's/#include <px4_'$k'/#include <px4_platform_common\/'$k/ $i; done; done
for in $(grep -rl 'include <px4_config.h' src platforms boards); do sed -i 's/#include <px4_config.h/#include <px4_platform_common\/px4_config.h'/ $i; done

Transitional headers for submodules are added (px4_{defines,log,time}.h)

platforms/common/include/px4_platform_common/posix.h

@@ -0,0 +1,148 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2015 Mark Charlebois. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file px4_posix.h
+ *
+ * Includes POSIX-like functions for virtual character devices
+ */
+
+#pragma once
+
+#include <px4_platform_common/defines.h>
+#include <px4_platform_common/tasks.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdint.h>
+
+#if defined(__PX4_QURT)
+#include <dspal_types.h>
+#else
+#include <sys/types.h>
+#endif
+
+#include "sem.h"
+
+#define  PX4_F_RDONLY 1
+#define  PX4_F_WRONLY 2
+
+#ifdef __PX4_NUTTX
+
+typedef struct pollfd px4_pollfd_struct_t;
+
+#if defined(__cplusplus)
+#define _GLOBAL ::
+#else
+#define _GLOBAL
+#endif
+#define px4_open 	_GLOBAL open
+#define px4_close 	_GLOBAL close
+#define px4_ioctl 	_GLOBAL ioctl
+#define px4_write 	_GLOBAL write
+#define px4_read 	_GLOBAL read
+#define px4_poll 	_GLOBAL poll
+#define px4_fsync 	_GLOBAL fsync
+#define px4_access 	_GLOBAL access
+#define px4_getpid 	_GLOBAL getpid
+
+#define  PX4_STACK_OVERHEAD	0
+
+#elif defined(__PX4_POSIX)
+
+#define	 PX4_STACK_OVERHEAD	(1024 * 11)
+
+/**
+ * Terminates the calling process immediately.
+ * @return 0 on success, 1 on error
+ */
+#define px4_exit(status) ({return status;})
+
+__BEGIN_DECLS
+
+typedef short pollevent_t;
+
+typedef struct {
+	/* This part of the struct is POSIX-like */
+	int		fd;       /* The descriptor being polled */
+	pollevent_t 	events;   /* The input event flags */
+	pollevent_t 	revents;  /* The output event flags */
+
+	/* Required for PX4 compatibility */
+	px4_sem_t   *sem;  	/* Pointer to semaphore used to post output event */
+	void   *priv;     	/* For use by drivers */
+} px4_pollfd_struct_t;
+
+__EXPORT int 		px4_open(const char *path, int flags, ...);
+__EXPORT int 		px4_close(int fd);
+__EXPORT ssize_t	px4_read(int fd, void *buffer, size_t buflen);
+__EXPORT ssize_t	px4_write(int fd, const void *buffer, size_t buflen);
+__EXPORT int		px4_ioctl(int fd, int cmd, unsigned long arg);
+__EXPORT int		px4_poll(px4_pollfd_struct_t *fds, nfds_t nfds, int timeout);
+__EXPORT int		px4_fsync(int fd);
+__EXPORT int		px4_access(const char *pathname, int mode);
+__EXPORT px4_task_t	px4_getpid(void);
+
+__END_DECLS
+#else
+#error "No TARGET OS Provided"
+#endif
+
+
+// The stack size is intended for 32-bit architectures; therefore
+// we often run out of stack space when pointers are larger than 4 bytes.
+// Double the stack size on posix when we're on a 64-bit architecture.
+// Most full-scale OS use 1-4K of memory from the stack themselves
+#define PX4_STACK_ADJUSTED(_s) (_s * (__SIZEOF_POINTER__ >> 2) + PX4_STACK_OVERHEAD)
+
+__BEGIN_DECLS
+extern int px4_errno;
+
+__EXPORT void		px4_show_devices(void);
+__EXPORT void		px4_show_files(void);
+__EXPORT const char 	*px4_get_device_names(unsigned int *handle);
+
+__EXPORT void		px4_show_topics(void);
+__EXPORT const char 	*px4_get_topic_names(unsigned int *handle);
+
+#ifndef __PX4_QURT
+/*
+ * The UNIX epoch system time following the system clock
+ */
+__EXPORT uint64_t	hrt_system_time(void);
+
+
+#endif
+
+__END_DECLS