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NetBSD 6.1.5 - man page for login_tty (netbsd section 3)

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OPENPTY(3)			   BSD Library Functions Manual 		       OPENPTY(3)

     openpty, login_tty, forkpty -- tty utility functions

     System Utilities Library (libutil, -lutil)

     #include <util.h>

     openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp);

     login_tty(int fd);

     forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp);

     The openpty(), login_tty(), and forkpty() functions perform manipulations on ttys and

     The openpty() function finds an available pseudo-tty and returns file descriptors for the
     master and slave in amaster and aslave.  If name is non-null, the filename of the slave is
     returned in name.	If termp is non-null, the terminal parameters of the slave will be set to
     the values in termp.  If winp is non-null, the window size of the slave will be set to the
     values in winp.

     The login_tty() function prepares for a login on the tty fd (which may be a real tty device,
     or the slave of a pseudo-tty as returned by openpty()) by creating a new session, making fd
     the controlling terminal for the current process, setting fd to be the standard input, out-
     put, and error streams of the current process, and closing fd.

     The forkpty() function combines openpty(), fork(), and login_tty() to create a new process
     operating in a pseudo-tty.  The file descriptor of the master side of the pseudo-tty is
     returned (to the parent process only) in amaster.	The filename of the slave is returned (to
     both the parent and child processes) in name if name is non-null.	The termp and winp param-
     eters, if non-null, will determine the terminal attributes and window size of the slave side
     of the pseudo-tty.

     If a call to openpty(), login_tty(), or forkpty() is not successful, -1 is returned and
     errno is set to indicate the error.  Otherwise, openpty(), login_tty(), and the child
     process of forkpty() return 0, and the parent process of forkpty() returns the process ID of
     the child process.


     openpty() will fail if:

     [ENOENT]		There are no available ttys.

     [EPERM]		The caller was not the superuser and the ptm(4) device is missing or not

     login_tty() will fail if ioctl() fails to set fd to the controlling terminal of the current
     process.  forkpty() will fail if either openpty() or fork() fails.


BSD					November 28, 2008				      BSD
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