/* The <unistd.h> header contains a few miscellaneous manifest constants. */#ifndef _UNISTD_H#define _UNISTD_H#ifndef _TYPES_H#include <sys/types.h>#endif/* Values used by access().  POSIX Table 2-8. */#define F_OK               0	/* test if file exists */#define X_OK               1	/* test if file is executable */#define W_OK               2	/* test if file is writable */#define R_OK               4	/* test if file is readable *//* Values used for whence in lseek(fd, offset, whence).  POSIX Table 2-9. */#define SEEK_SET           0	/* offset is absolute  */#define SEEK_CUR           1	/* offset is relative to current position */#define SEEK_END           2	/* offset is relative to end of file *//* This value is required by POSIX Table 2-10. */#define _POSIX_VERSION 199009L	/* which standard is being conformed to *//* These three definitions are required by POSIX Sec. 8.2.1.2. */#define STDIN_FILENO       0	/* file descriptor for stdin */#define STDOUT_FILENO      1	/* file descriptor for stdout */#define STDERR_FILENO      2	/* file descriptor for stderr */#ifdef _MINIX/* How to exit the system or stop a server process. */#define RBT_HALT	   0#define RBT_REBOOT	   1#define RBT_PANIC	   2	/* a server panics */#define RBT_MONITOR	   3	/* let the monitor do this */#define RBT_RESET	   4	/* hard reset the system */#endif/* What system info to retrieve with sysgetinfo(). */#define SI_KINFO	   0	/* get kernel info via PM */#define SI_PROC_ADDR	   1	/* address of process table */#define SI_PROC_TAB	   2	/* copy of entire process table */#define SI_DMAP_TAB	   3	/* get device <-> driver mappings */#define SI_MEM_ALLOC	   4	/* get memory allocation data */#define SI_DATA_STORE	   5	/* get copy of data store *//* NULL must be defined in <unistd.h> according to POSIX Sec. 2.7.1. */#define NULL    ((void *)0)/* The following relate to configurable system variables. POSIX Table 4-2. */#define _SC_ARG_MAX	   1#define _SC_CHILD_MAX	   2#define _SC_CLOCKS_PER_SEC 3#define _SC_CLK_TCK	   3#define _SC_NGROUPS_MAX	   4#define _SC_OPEN_MAX	   5#define _SC_JOB_CONTROL	   6#define _SC_SAVED_IDS	   7#define _SC_VERSION	   8#define _SC_STREAM_MAX	   9#define _SC_TZNAME_MAX    10/* The following relate to configurable pathname variables. POSIX Table 5-2. */#define _PC_LINK_MAX	   1	/* link count */#define _PC_MAX_CANON	   2	/* size of the canonical input queue */#define _PC_MAX_INPUT	   3	/* type-ahead buffer size */#define _PC_NAME_MAX	   4	/* file name size */#define _PC_PATH_MAX	   5	/* pathname size */#define _PC_PIPE_BUF	   6	/* pipe size */#define _PC_NO_TRUNC	   7	/* treatment of long name components */#define _PC_VDISABLE	   8	/* tty disable */#define _PC_CHOWN_RESTRICTED 9	/* chown restricted or not *//* POSIX defines several options that may be implemented or not, at the * implementer's whim.  This implementer has made the following choices: * * _POSIX_JOB_CONTROL	    not defined:	no job control * _POSIX_SAVED_IDS 	    not defined:	no saved uid/gid * _POSIX_NO_TRUNC	    defined as -1:	long path names are truncated * _POSIX_CHOWN_RESTRICTED  defined:		you can't give away files * _POSIX_VDISABLE	    defined:		tty functions can be disabled */#define _POSIX_NO_TRUNC       (-1)#define _POSIX_CHOWN_RESTRICTED  1/* Function Prototypes. */_PROTOTYPE( void _exit, (int _status)					);_PROTOTYPE( int access, (const char *_path, int _amode)			);_PROTOTYPE( unsigned int alarm, (unsigned int _seconds)			);_PROTOTYPE( int chdir, (const char *_path)				);_PROTOTYPE( int fchdir, (int fd)					);_PROTOTYPE( int chown, (const char *_path, _mnx_Uid_t _owner, _mnx_Gid_t _group)	);_PROTOTYPE( int close, (int _fd)					);_PROTOTYPE( char *ctermid, (char *_s)					);_PROTOTYPE( char *cuserid, (char *_s)					);_PROTOTYPE( int dup, (int _fd)						);_PROTOTYPE( int dup2, (int _fd, int _fd2)				);_PROTOTYPE( int execl, (const char *_path, const char *_arg, ...)	);_PROTOTYPE( int execle, (const char *_path, const char *_arg, ...)	);_PROTOTYPE( int execlp, (const char *_file, const char *arg, ...)	);_PROTOTYPE( int execv, (const char *_path, char *const _argv[])		);_PROTOTYPE( int execve, (const char *_path, char *const _argv[], 						char *const _envp[])	);_PROTOTYPE( int execvp, (const char *_file, char *const _argv[])	);_PROTOTYPE( pid_t fork, (void)						);_PROTOTYPE( int chrt, (long _deadline)					);_PROTOTYPE( long fpathconf, (int _fd, int _name)			);_PROTOTYPE( char *getcwd, (char *_buf, size_t _size)			);_PROTOTYPE( gid_t getegid, (void)					);_PROTOTYPE( uid_t geteuid, (void)					);_PROTOTYPE( gid_t getgid, (void)					);_PROTOTYPE( int getgroups, (int _gidsetsize, gid_t _grouplist[])	);_PROTOTYPE( char *getlogin, (void)					);_PROTOTYPE( pid_t getpgrp, (void)					);_PROTOTYPE( pid_t getpid, (void)					);_PROTOTYPE( pid_t getnpid, (int proc_nr)				);_PROTOTYPE( pid_t getppid, (void)					);_PROTOTYPE( uid_t getuid, (void)					);_PROTOTYPE( int isatty, (int _fd)					);_PROTOTYPE( int link, (const char *_existing, const char *_new)		);_PROTOTYPE( off_t lseek, (int _fd, off_t _offset, int _whence)		);_PROTOTYPE( long pathconf, (const char *_path, int _name)		);_PROTOTYPE( int pause, (void)						);_PROTOTYPE( int pipe, (int _fildes[2])					);_PROTOTYPE( ssize_t read, (int _fd, void *_buf, size_t _n)		);_PROTOTYPE( int rmdir, (const char *_path)				);_PROTOTYPE( int setgid, (_mnx_Gid_t _gid)				);_PROTOTYPE( int setpgid, (pid_t _pid, pid_t _pgid)			);_PROTOTYPE( pid_t setsid, (void)					);_PROTOTYPE( int setuid, (_mnx_Uid_t _uid)				);_PROTOTYPE( unsigned int sleep, (unsigned int _seconds)			);_PROTOTYPE( long sysconf, (int _name)					);_PROTOTYPE( pid_t tcgetpgrp, (int _fd)					);_PROTOTYPE( int tcsetpgrp, (int _fd, pid_t _pgrp_id)			);_PROTOTYPE( char *ttyname, (int _fd)					);_PROTOTYPE( int unlink, (const char *_path)				);_PROTOTYPE( ssize_t write, (int _fd, const void *_buf, size_t _n)	);/* Open Group Base Specifications Issue 6 (not complete) */_PROTOTYPE( int symlink, (const char *path1, const char *path2)		);_PROTOTYPE( int getopt, (int _argc, char **_argv, char *_opts)		);extern char *optarg;extern int optind, opterr, optopt;_PROTOTYPE( int usleep, (useconds_t _useconds)				);#ifdef _MINIX#ifndef _TYPE_H#include <minix/type.h>#endif_PROTOTYPE( int brk, (char *_addr)					);_PROTOTYPE( int chroot, (const char *_name)				);_PROTOTYPE( int mknod, (const char *_name, _mnx_Mode_t _mode, Dev_t _addr)	);_PROTOTYPE( int mknod4, (const char *_name, _mnx_Mode_t _mode, Dev_t _addr,	    long _size)							);_PROTOTYPE( char *mktemp, (char *_template)				);_PROTOTYPE( int mount, (char *_spec, char *_name, int _flag)		);_PROTOTYPE( long ptrace, (int _req, pid_t _pid, long _addr, long _data)	);_PROTOTYPE( char *sbrk, (int _incr)					);_PROTOTYPE( int sync, (void)						);_PROTOTYPE( int fsync, (int fd)						);_PROTOTYPE( int umount, (const char *_name)				);_PROTOTYPE( int reboot, (int _how, ...)					);_PROTOTYPE( int gethostname, (char *_hostname, size_t _len)		);_PROTOTYPE( int getdomainname, (char *_domain, size_t _len)		);_PROTOTYPE( int ttyslot, (void)						);_PROTOTYPE( int fttyslot, (int _fd)					);_PROTOTYPE( char *crypt, (const char *_key, const char *_salt)		);_PROTOTYPE( int getsysinfo, (int who, int what, void *where)		);_PROTOTYPE( int getprocnr, (void)					);_PROTOTYPE( int getnprocnr, (pid_t pid)					);_PROTOTYPE( int getpprocnr, (void)					);_PROTOTYPE( int findproc, (char *proc_name, int *proc_nr)		);_PROTOTYPE( int allocmem, (phys_bytes size, phys_bytes *base)		);_PROTOTYPE( int freemem, (phys_bytes size, phys_bytes base)		);#define DEV_MAP 1#define DEV_UNMAP 2#define mapdriver(driver, device, style) devctl(DEV_MAP, driver, device, style)#define unmapdriver(device) devctl(DEV_UNMAP, 0, device, 0)_PROTOTYPE( int devctl, (int ctl_req, int driver, int device, int style));/* For compatibility with other Unix systems */_PROTOTYPE( int getpagesize, (void)					);_PROTOTYPE( int setgroups, (int ngroups, const gid_t *gidset)		);#endif_PROTOTYPE( int readlink, (const char *, char *, int));_PROTOTYPE( int getopt, (int, char **, char *));extern int optind, opterr, optopt;#endif /* _UNISTD_H */