isatty man page on FreeBSD

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TTYNAME(3)		 BSD Library Functions Manual		    TTYNAME(3)

     ttyname, ttyname_r, isatty, ttyslot — get name of associated terminal
     (tty) from file descriptor

     Standard C Library (libc, -lc)

     #include <unistd.h>

     char *
     ttyname(int fd);

     ttyname_r(int fd, char *buf, size_t len);

     isatty(int fd);


     These functions operate on the system file descriptors for terminal type
     devices.  These descriptors are not related to the standard I/O FILE
     typedef, but refer to the special device files found in /dev and for
     which an entry exists in the initialization file /etc/ttys or pseudo-ter‐
     minals.  (See ttys(5).)

     The isatty() function determines if the file descriptor fd refers to a
     valid terminal type device.

     The ttyname() function gets the related device name of a file descriptor
     for which isatty() is true.

     The ttyname() function returns the name stored in a static buffer which
     will be overwritten on subsequent calls.  The ttyname_r() function takes
     a buffer and length as arguments to avoid this problem.

     The ttyslot() function fetches the current process' control terminal num‐
     ber from the ttys(5) file entry.

     The ttyname() function returns the null terminated name if the device is
     found and isatty() is true; otherwise a NULL pointer is returned.	The
     ttyname_r() function returns 0 if successful.  Otherwise an error number
     is returned.

     The ttyslot() function returns the unit number of the device file if
     found; otherwise the value zero is returned.


     The ttyname_r() may fail and return the following error codes:

     [ENOTTY]		The fd argument is not a valid file descriptor.

     [ERANGE]		The bufsize argument is smaller than the length of the
			string to be returned.

     ioctl(2), ttys(5)

     The isatty(), ttyname(), and ttyslot() functions appeared in Version 7
     AT&T UNIX.	 The ttyname_r() function appeared in FreeBSD 6.0.

BSD				 May 14, 2005				   BSD

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