login_tty man page on ElementaryOS

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

       openpty, login_tty, forkpty - terminal utility functions

       #include <pty.h>

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

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

       #include <utmp.h>

       int login_tty(int fd);

       Link with -lutil.

       The  openpty()  function	 finds an available pseudoterminal 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 terminal fd (which
       may  be	a  real	 terminal  device, or the slave of a pseudoterminal as
       returned by openpty()) by creating a new session, making	 fd  the  con‐
       trolling	 terminal  for the calling process, setting fd to be the stan‐
       dard input, output, and error streams of the current process, and clos‐
       ing fd.

       The  forkpty() function combines openpty(), fork(2), and login_tty() to
       create a new process operating in a pseudoterminal.  The file  descrip‐
       tor  of	the  master side of the pseudoterminal is returned in amaster,
       and the filename of the slave in name if it is not NULL.	 The termp and
       winp arguments, if not NULL, will determine the terminal attributes and
       window size of the slave side of the pseudoterminal.

       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

       openpty() will fail if:

       ENOENT There are no available terminals.

       login_tty() will fail if ioctl(2) fails to set fd  to  the  controlling
       terminal of the calling process.

       forkpty() will fail if either openpty() or fork(2) fails.

       These  are  BSD	functions,  present in libc5 and glibc2.  They are not
       standardized in POSIX.

       The const modifiers were added to the structure	pointer	 arguments  of
       openpty() and forkpty() in glibc 2.8.

       In  versions of glibc before 2.0.92, openpty() returns file descriptors
       for a BSD pseudoterminal pair; since glibc 2.0.92, it first attempts to
       open  a	UNIX  98  pseudoterminal pair, and falls back to opening a BSD
       pseudoterminal pair if that fails.

       Nobody knows how much space should be reserved for name.	  So,  calling
       openpty() or forkpty() with non-NULL name may not be secure.

       fork(2), ttyname(3), pty(7)

       This  page  is  part of release 3.54 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2010-06-13			    OPENPTY(3)

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