posix_openpt man page on FreeBSD

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POSIX_OPENPT(2)		    BSD System Calls Manual	       POSIX_OPENPT(2)

     posix_openpt — open a pseudo-terminal device

     Standard C Library (libc, -lc)

     #include <stdlib.h>
     #include <fcntl.h>

     posix_openpt(int oflag);

     The posix_openpt() function allocates a new pseudo-terminal and estab‐
     lishes a connection with its master device.  A slave device shall be cre‐
     ated in /dev/pts.	After the pseudo-terminal has been allocated, the
     slave device should have the proper permissions before it can be used
     (see grantpt(3)).	The name of the slave device can be determined by
     calling ptsname(3).

     The file status flags and file access modes of the open file description
     shall be set according to the value of oflag.  Values for oflag are con‐
     structed by a bitwise-inclusive OR of flags from the following list,
     defined in <fcntl.h>:

     O_RDWR    Open for reading and writing.

     O_NOCTTY  If set posix_openpt() shall not cause the terminal device to
	       become the controlling terminal for the process.

     The posix_openpt() function shall fail when oflag contains other values.

     Upon successful completion, the posix_openpt() function shall allocate a
     new pseudo-terminal device and return a non-negative integer representing
     a file descriptor, which is connected to its master device.  Otherwise,
     -1 shall be returned and errno set to indicate the error.

     The posix_openpt() function shall fail if:

     [ENFILE]		The system file table is full.

     [EINVAL]		The value of oflag is not valid.

     [EAGAIN]		Out of pseudo-terminal resources.

     pts(4), ptsname(3), tty(4)

     The posix_openpt() function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).

     The posix_openpt() function appeared in FreeBSD 5.0.  In FreeBSD 8.0,
     this function was changed to a system call.

     The flag O_NOCTTY is included for compatibility; in FreeBSD, opening a
     terminal does not cause it to become a process's controlling terminal.

     Ed Schouten ⟨ed@FreeBSD.org⟩

BSD				August 20, 2008				   BSD

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