posix_openpt man page on CentOS

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

NAME
       posix_openpt - open a pseudo-terminal device

SYNOPSIS
       #define _XOPEN_SOURCE
       #include <stdlib.h>
       #include <fcntl.h>

       char *posix_openpt(int flags);

DESCRIPTION
       The  posix_openpt()  function  opens  an	 unused pseudo-terminal master
       device, returning a file descriptor that can be used to refer  to  that
       device.

       The  flags argument is a bit mask that ORs together zero or more of the
       following flags:

       O_RDWR Open the device for both reading and writing.  It	 is  usual  to
	      specify this flag.

       O_NOCTTY
	      Do  not  make  this  device  the	controlling  terminal  for the
	      process.

RETURN VALUE
       On success, ptsname() returns a non-negative file descriptor  which  is
       the lowest numbered unused descriptor.  On failure, -1 is returned, and
       errno is set to indicate the error.

ERRORS
       See open(2).

CONFORMING TO
       posix_openpt() is part  of  the	Unix98	pseudo-terminal	 support  (see
       pts(4)).	 This function is specified in POSIX.1-2001.

NOTES
       This  function  is  a recent invention in POSIX.	 Some Unix implementa‐
       tions that support System V (aka Unix 98) pseudo-terminals  don't  have
       this function, but it is easy to implement:

	    int
	    posix_openpt(int flags)
	    {
		return open("/dev/ptmx", flags);
	    }

SEE ALSO
       open(2), getpt(3), grantpt(3), ptsname(3), unlock(3), pts(4), pty(7)

PTY Control			  2004-12-17		       POSIX_OPENPT(3)
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