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

       openpty, login_tty, forkpty - tty utility functions

       #include <pty.h>  /* for openpty and forkpty */
       #include <utmp.h> /* for login_tty */

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

       int login_tty(int fd);

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

       The openpty() function finds an available pseudo-tty and returns file descriptors for  the
       master and slave in amaster and aslave.	If name is not NULL, the filename of the slave is
       returned in name.  If termp is not NULL, the terminal parameters of the slave will be  set
       to  the values in termp.  If winp is not 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, output, 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  in  amaster, and the filename of the slave in name if it is not NULL.	The termp
       and winp parameters, if not 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.

       login_pty() will fail if ioctl() fails to set fd to the controlling terminal of	the  cur-
       rent process.

       forkpty() will fail if either openpty() or fork() fails.


       These are BSD functions, present in libc5 and glibc2.


BSD MANPAGE				    2001-12-13				       OPENPTY(3)
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