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RedHat 9 (Linux i386) - man page for ttyname_r (redhat section 3)

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TTYNAME(3)			    Linux Programmer's Manual			       TTYNAME(3)

       ttyname, ttyname_r - return name of a terminal

       #include <unistd.h>

       char *ttyname(int desc);
       int ttyname_r(int desc, char *buf, size_t buflen);

       The  function  ttyname()  returns a pointer to the NUL-terminated pathname of the terminal
       device that is open on the file descriptor desc, or NULL on error (for example, if desc is
       not  connected  to a terminal).	The return value may point to static data, possibly over-
       written by the next call.  The function ttyname_r() stores this pathname in the buffer buf
       of length buflen.

       The  function  ttyname()  returns  a  pointer  to a pathname on success. On error, NULL is
       returned, and errno is set appropriately.  The function ttyname_r() returns 0 on  success,
       and an error number upon error.

       Values stored in errno by a failing ttyname() or returned by a failing ttyname_r():

       EBADF  Bad file descriptor.

       ENOTTY File descriptor does not refer to a terminal device.

       ERANGE buflen was too small to allow storing the pathname.


       fstat(2), isatty(3)

Linux					    2002-07-20				       TTYNAME(3)
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