| OPENPTY(3) | Library Functions Manual | OPENPTY(3) | 
openpty, login_tty,
  forkpty —
#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);
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. The length of
    name is limited to PATH_MAX as
    any other regular path name, so a buffer of this size should be used. 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, 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 (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 parameters, if
    non-null, will determine the terminal attributes and window size of the
    slave side of the pseudo-tty.
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]EPERM]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.
| July 27, 2012 | NetBSD 9.4 |