Linux 2.6 - man page for posix_openpt (linux section 3)
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POSIX_OPENPT(3) Linux Programmer's Manual POSIX_OPENPT(3)
posix_openpt - open a pseudoterminal device
int posix_openpt(int flags);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
posix_openpt(): _XOPEN_SOURCE >= 600
The posix_openpt() function opens an unused pseudoterminal 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.
Do not make this device the controlling terminal for the process.
On success, posix_openpt() returns a nonnegative file descriptor which is the lowest num-
bered unused descriptor. On failure, -1 is returned, and errno is set to indicate the
Glibc support for posix_openpt() has been provided since version 2.2.1.
posix_openpt() is part of the UNIX 98 pseudoterminal support (see pts(4)). This function
is specified in POSIX.1-2001.
The posix_openpt() function is a recent invention in POSIX. Some UNIX implementations
that support System V (aka UNIX 98) pseudoterminals don't have this function, but it is
easy to implement:
return open("/dev/ptmx", flags);
Calling posix_openpt() creates a pathname for the corresponding pseudoterminal slave
device. The pathname of the slave device can be obtained using ptsname(3). The slave
device pathname exists only as long as the master device is open.
open(2), getpt(3), grantpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
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