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Manual Pages  — LOGIN_TTY

NAME

login_tty – prepare a tty for a new login session

CONTENTS

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 reading 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)

LOGIN_TTY (3) December 29, 1996

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Ken Thompson has an automobile which he helped design. Unlike most automobiles, it has neither speedometer, nor gas gauge, nor any of the other numerous idiot lights which plague the modern driver. Rather, if the driver makes a mistake, a giant “?” lights up in the center of the dashboard. “The experienced driver,” says Thompson, “will usually know what's wrong.”