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

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

NAME
     openpty, login_tty, forkpty -- tty utility functions

LIBRARY
     System Utilities Library (libutil, -lutil)

SYNOPSIS
     #include <util.h>

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

     int
     login_tty(int fd);

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

DESCRIPTION
     The openpty(), login_tty(), and forkpty() functions perform manipulations on ttys and
     pseudo-ttys.

     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.

RETURN VALUES
     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.

FILES
     /dev/[pt]ty[p-zP-T][0-9a-zA-Z]

ERRORS
     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
			configured.

     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.

SEE ALSO
     fork(2)

BSD					November 28, 2008				      BSD


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