TTYNAMESection: Linux Programmer's Manual (3)
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NAMEttyname, ttyname_r - return name of a terminal
#include <unistd.h> char *ttyname(int fd); int ttyname_r(int fd, char *buf, size_t buflen);
DESCRIPTIONThe function ttyname() returns a pointer to the null-terminated pathname of the terminal device that is open on the file descriptor fd, or NULL on error (for example, if fd is not connected to a terminal). The return value may point to static data, possibly overwritten by the next call. The function ttyname_r() stores this pathname in the buffer buf of length buflen.
RETURN VALUEThe 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.
- Bad file descriptor.
- File descriptor does not refer to a terminal device.
- buflen was too small to allow storing the pathname.
CONFORMING TO4.2BSD, POSIX.1-2001.
SEE ALSOfstat(2), isatty(3)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.