ttyname(3C)

NAME

ttyname(), isatty() − find name of a terminal

#include <unistd.h>

char *ttyname(int fildes);

int isatty(int fildes);

ttyname() returns a pointer to a string containing the null-terminated path name of the terminal device associated with file descriptor fildes.

isatty() returns 1 if fildes is associated with a terminal device, 0 otherwise.

ttyname() returns a NULL pointer if fildes does not describe a terminal device in directory /dev.

isatty() and ttyname() fail if any of the following conditions are encountered:

[EBADF] The fildes argument is invalid.

[ENOTTY] An inappropriate I/O control operation has been attempted.

The return value points to static data whose content is overwritten by each call.

/dev/*
/dev/pty/*

ttyname(): AES, SVID2, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1

isatty(): AES, SVID2, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1

Hewlett-Packard Company — HP-UX Release 9.0: August 1992