ttyname(3) Library Functions Manual ttyname(3)Name
ttyname, isatty, ttyslot - find terminal name
The subroutine returns a pointer to the null-terminated path name of the terminal device associated with file descriptor filedes (this is a
system file descriptor and has nothing to do with the standard I/O FILE typedef).
The subroutine returns 1 if filedes is associated with a terminal device, 0 otherwise.
The subroutine returns the number of the entry in the file for the control terminal of the current process.
The return value points to static data whose content is overwritten by each call.
The subroutine returns a null pointer (0) if filedes does not describe a terminal device in directory
The subroutine returns 0 if is inaccessible or if it cannot determine the control terminal.
See Alsoioctl(2), ttys(5)ttyname(3)
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TTYNAME(3) BSD Library Functions Manual TTYNAME(3)NAME
isatty, ttyname, ttyslot -- get name of associated terminal (tty) from file descriptor
Standard C Library (libc, -lc)
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 named /dev/ttyxx and for which an entry exists in the initialization file
/etc/ttys. (See ttys(5).)
The isatty() function determines if the file descriptor fildes 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 ttyslot() function fetches the current process' control terminal number 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 ttyslot() function returns the unit number of the device file if found; otherwise, the value zero is returned.
SEE ALSO ioctl(2), ttys(5)HISTORY
A isatty(), ttyname(), and ttyslot() function appeared in Version 7 AT&T UNIX.
The ttyname() function leaves its result in an internal static object and returns a pointer to that object. Subsequent calls to ttyname()
will modify the same object.
BSD June 4, 1993 BSD
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