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ttyname(3C)							   ttyname(3C)

       ttyname,	ttyname_r - find pathname of a terminal

       #include	<unistd.h>

       char *ttyname(int fildes);

       char *ttyname_r(int fildes, char	*name, int namelen);

   Standard conforming
       cc [ flag...] file ... -D_POSIX_PTHREAD_SEMANTICS [ library ... ]

       int ttyname_r(int fildes, char *name, size_t namesize);

       The  ttyname()  function	 returns  a pointer to a string	containing the
       null-terminated path name of the	terminal device	associated  with  file
       descriptor  fildes.  The	 return	 value	points to thread-specific data
       whose content is	overwritten by each call from the same thread.

       The ttyname_r() function	has the	same functionality as ttyname()	except
       that  the caller	must supply a buffer name with length namelen to store
       the result; this	buffer must be at least	_POSIX_PATH_MAX	in  size  (de-
       fined  in  <limits.h>).	The  standard-conforming  version  (see	 stan-
       dards(5)) of ttyname_r()	takes a	namesize parameter of type size_t.

       Upon successful completion, ttyname() and ttyname_r() return a  pointer
       to  a string. Otherwise,	a null pointer is returned and errno is	set to
       indicate	the error.

       The standard-conforming ttyname_r() returns 0 if	successful or the  er-
       ror number upon failure.

       The ttyname() and ttyname_r() functions may fail	if:

       EBADF	       The  fildes  argument  is  not a	valid file descriptor.
		       This condition is reported.

       ENOTTY	       The fildes argument does	not refer to  a	 terminal  de-
		       vice. This condition is reported.

       The ttyname_r() function	may fail if:

       ERANGE	       The value of namesize is	smaller	than the length	of the
		       string to be returned including	the  terminating  null

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       |Interface Stability	     |Standard			   |
       |MT-Level		     |Safe			   |

       Intro(3), gettext(3C), setlocale(3C), attributes(5), standards(5)

       When  compiling multithreaded applications, see Intro(3), Notes On Mul-
       tithreaded Applications.

       Messages	printed	from this function are in the native  language	speci-
       fied by the LC_MESSAGES locale category.	See setlocale(3C).

       The return value	of ttyname() points to thread-specific data whose con-
       tent is overwritten by each call	from the same thread. This function is
       safe  to	use in multithreaded applications, but its use is discouraged.
       The ttyname_r() function	should used instead.

       Solaris 2.4 and earlier	releases  provided  definitions	 of  the  tty-
       name_r()	interface as specified in POSIX.1c Draft 6. The	final POSIX.1c
       standard	changed	the interface as  described  above.  Support  for  the
       Draft  6	 interface is provided for compatibility only and might	not be
       supported in future releases. New applications and libraries should use
       the standard-conforming interface.

				  31 Mar 2005			   ttyname(3C)


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