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FreeBSD 11.0 - man page for login_tty (freebsd section 3)

LOGIN_TTY(3)						   BSD Library Functions Manual 					      LOGIN_TTY(3)

NAME
login_tty -- prepare a tty for a new login session
LIBRARY
System Utilities Library (libutil, -lutil)
SYNOPSIS
#include <libutil.h> int login_tty(int fd);
DESCRIPTION
The function login_tty() prepares a terminal for a new login session. The file descriptor fd passed to login_tty() must be opened for read- ing and writing on a terminal device. It will be made the controlling terminal for the calling process, after allocating a new session with setsid(2). This terminal device will also be made the standard input, standard output, and standard error output of the calling process.
RETURN VALUES
The login_tty() function returns -1 if it could not make the device referenced by fd the controlling terminal of the calling process, and 0 otherwise.
SEE ALSO
dup2(2), ioctl(2), setsid(2), tty(4)
BSD
December 29, 1996 BSD

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