|POSIX_OPENPT(3)||Linux Programmer's Manual||POSIX_OPENPT(3)|
NAMEposix_openpt - open a pseudoterminal device
int posix_openpt(int flags );
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONThe posix_openpt() function opens an unused pseudoterminal master device, returning a file descriptor that can be used to refer to that device.
- 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.
RETURN VALUEOn success, posix_openpt() returns a nonnegative file descriptor which is the lowest numbered unused descriptor. On failure, -1 is returned, and errno is set to indicate the error.
VERSIONSGlibc support for posix_openpt() has been provided since version 2.2.1.
CONFORMING TOposix_openpt() is part of the UNIX 98 pseudoterminal support (see pts(4)). This function is specified in POSIX.1-2001.
NOTESThe 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.
SEE ALSOopen(2), getpt(3), grantpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
COLOPHONThis page is part of release 3.53 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/.