unistd(5)							File Formats Manual							 unistd(5)

NAME

       unistd: unistd.h - standard structures and symbolic constants

SYNOPSIS

DESCRIPTION

       The header defines the following structures and symbolic constants:

       Symbolic constants for the function:

	      Test for read permission.
	      Test for write permission.
	      Test for execute (search) permission.
	      Test for existence of file.

       The constants and and the expressions and all have distinct values.

       Symbolic constant representing a null pointer:

       Symbolic constants for the and functions (the following constants have distinct values):

	      Set file offset to "offset".
	      Set file offset to current plus "offset".
	      Set file offset to EOF plus "offset".

       Symbolic constants (with fixed values):

	      Integer value indicating version of
				       IEEE  Std  1003.1  standard  implemented.   The current value is 199009L, indicating the (4-digit) year and
				       (2-digit) month that the standard was approved by the IEEE Standards Board.  However, if any of the symbols
				       or is defined before is included, the value of this symbol will be 198808L.

	      Integer value indicating version of
				       IEEE  Std1003.2	standard  implemented.	 The  current  value is 199209L, indicating the (4-digit) year and
				       (2-digit) month that the standard was approved by the IEEE Standards Board.

	      Integer value indicating version of
				       IEEE Std 1003.2 C-Language Binding Option implemented.	The  current  value  is  199209L,  indicating  the
				       (4-digit) year and (2-digit) month that the standard was approved by the IEEE Standards Board.

	      Integer value indicating issue number of the
				       X/Open  Portability Guide implemented.  The current value is 4, indicating Issue 4.  However, if the symbol
				       is defined before is included, the value of this symbol will be 3.

       The following symbolic constants are defined in this header if the state of the corresponding option or restriction  does  not  vary  after
       compilation.  If a symbol is absent from this header, the value or presence of the corresponding option or restriction should be determined
       at execution time through or

	      The use of	       is restricted to processes that have appropriate privileges.

	      Implementation supports job control (true of all
				       HP-UX implementations).

	      Pathname components longer than
				       generate an error.

	      Implementation supports Realtime Signals Extensions
				       (true of all HP-UX implementations).

	      Effective user and group are saved across an
				       call (true of all HP-UX implementations).

	      Implementation supports File Synchronization (true of all
				       HP-UX implementations).	See open(2).

	      Implementation supports Synchronized IO (true of all
				       HP-UX implementations).	See open(2).

	      Terminal special characters can be disabled using this character (see
				       termio(7)).

	      Implementation supports POSIX threads.

	      All POSIX.2 C-language functionality is provided
				       in the default libraries used by the C compiler (see cc(1)).

	      New locales can be defined by using the
				       command (see localedef(1M)).

	      The system supports      IEEE Std1003.2a (POSIX User Portability Utilities Option).

	      At least one terminal exists that supports all required POSIX.2a commands.

       All symbolic constants whose names begin and (see confstr(3C), pathconf(2), and sysconf(2)) are defined.

       The following symbolic constants for file streams are defined:

	      File number of standard input
				       (stdin).
	      File number of standard output
				       (stdout).
	      File number of standard error
				       (stderr).

       The types and are defined.

       Declarations are provided for the following functions:

	      access()	      alarm()	    brk()	     chdir()
	      chown()	      chroot()	    close()	     confstr()
	      crypt()	      ctermid()     cuserid()	     dup()
	      dup2()	      encrypt()     endusershell()   execl()
	      execle()	      execlp()	    execv()	     execve()
	      execvp()	      _exit()	    fchown()	     fork()
	      fpathconf()     fsync()	    ftruncate()      getcwd()
	      getegid()       geteuid()     getgid()	     getgroups()
	      gethostname()   getlogin()    getopt()
	      getpass()       getpgrp()     getpgrp2()	     getpid()
	      getppid()       getuid()	    getusershell()   initgroups()
	      ioctl()	      isatty()	    link()	     lockf()
	      logname()       lseek()	    mkstemp()	     mktemp()
	      nice()	      pathconf()    pause()	     pipe()
	      prealloc()      read()	    readlink()	     rmdir()
	      sbrk()	      setgid()	    setgroups()      sethostname()
	      setpgid()       setpgrp()     setpgrp2()	     setresgid()
	      setresuid()     setsid()	    setuid()	     setusershell()
	      sgetl()	      sleep()	    sputl()	     swab()
	      swapon()	      symlink()     sync()	     sysconf()
	      tcgetpgrp()     tcsetpgrp()   truncate()	     ttyname()
	      ttyslot()       unlink()	    vfork()	     write()

AUTHOR

       was developed by HP.

SEE ALSO

       access(2), chown(2), exit(2), fcntl(2), kill(2), lseek(2), open(2), pathconf(2), sysconf(2), confstr(3C), limits(5), stdsyms(5), termio(7).

STANDARDS CONFORMANCE

																	 unistd(5)