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

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

NAME
ttyname, ttyname_r - return name of a terminal
SYNOPSIS
#include <unistd.h> char *ttyname(int desc); int ttyname_r(int desc, char *buf, size_t buflen);
DESCRIPTION
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 overwritten by the next call. The function ttyname_r() stores this pathname in the buffer buf of length buflen.
RETURN VALUE
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.
ERRORS
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.
CONFORMING TO
POSIX.1
SEE ALSO
fstat(2), isatty(3) Linux 2002-07-20 TTYNAME(3)


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