/****************************************************************************
* unistd.h
*
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 NuttX 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.
*
****************************************************************************/
#ifndef __UNISTD_H
#define __UNISTD_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <nuttx/compiler.h>
/****************************************************************************
* Definitions
****************************************************************************/
/* The number of functions that may be registerd to be called
* at program exit.
*/
#define ATEXIT_MAX 1
/* Values for seeking */
#define SEEK_SET 0 /* From the start of the file */
#define SEEK_CUR 1 /* From the current file offset */
#define SEEK_END 2 /* From the end of the file */
/* Bit values for the second argument to access */
#define F_OK 0 /* Test existence */
#define R_OK 1 /* Test read permission */
#define W_OK 2 /* Test write permission */
#define X_OK 4 /* Test execute permission */
/* POSIX feature set macros */
#define POSIX_VERSION
#undef _POSIX_SAVED_IDS
#undef _POSIX_JOB_CONTROL
#define _POSIX_REALTIME_SIGNALS 1
#define _POSIX_MESSAGE_PASSING 1
#undef _POSIX_MAPPED_FILES
#undef _POSIX_SHARED_MEMORY_OBJECTS
#define _POSIX_PRIORITY_SCHEDULING 1
#define _POSIX_TIMERS
#undef _POSIX_MEMLOCK
#undef _POSIX_MEMLOCK_RANGE
#undef _POSIX_FSYNC
#define _POSIX_SYNCHRONIZED_IO
#undef _POSIX_ASYNCHRONOUS_IO
#undef _POSIX_PRIORITIZED_IO
/* Execution time constants (not supported) */
#undef _POSIX_CHOWN_RESTRICTED
#undef _POSIX_NO_TRUNC
#undef _POSIX_VDISABLE
#define _POSIX_SYNC_IO
#undef _POSIX_ASYNC_IO
#undef _POSIX_PRIO_IO
#define fdatasync(f) fsync(f)
/****************************************************************************
* Global Variables
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/* Used by getopt (obviously NOT thread safe!) */
EXTERN FAR char *optarg; /* Optional argument following option */
EXTERN int optind; /* Index into argv */
EXTERN int optopt; /* unrecognized option character */
/****************************************************************************
* Global Function Prototypes
****************************************************************************/
/* Task Control Interfaces */
EXTERN pid_t getpid(void);
EXTERN void _exit(int status) noreturn_function;
EXTERN unsigned int sleep(unsigned int seconds);
EXTERN void usleep(unsigned long usec);
/* File descriptor operations */
EXTERN int close(int fd);
EXTERN int dup(int fd);
EXTERN int dup2(int fd1, int fd2);
EXTERN int fsync(int fd);
EXTERN off_t lseek(int fd, off_t offset, int whence);
EXTERN ssize_t read(int fd, FAR void *buf, size_t nbytes);
EXTERN ssize_t write(int fd, FAR const void *buf, size_t nbytes);
/* Special devices */
EXTERN int pipe(int filedes[2]);
/* Working directory operations */
EXTERN int chdir(FAR const char *path);
EXTERN FAR char *getcwd(FAR char *buf, size_t size);
/* File path operations */
EXTERN int unlink(FAR const char *pathname);
EXTERN int rmdir(FAR const char *pathname);
/* Other */
EXTERN int getopt(int argc, FAR char *const argv[], FAR const char *optstring);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __UNISTD_H */
