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POSIX_OPENPT(3) - man page online | library functions

Open a pseudoterminal device.

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2015-08-08
POSIX_OPENPT(3)                     Linux Programmer's Manual                     POSIX_OPENPT(3)

NAME posix_openpt - open a pseudoterminal device
SYNOPSIS #include <stdlib.h> #include <fcntl.h> int posix_openpt(int flags); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): posix_openpt(): _XOPEN_SOURCE >= 600
DESCRIPTION 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. O_NOCTTY Do not make this device the controlling terminal for the process.
RETURN VALUE 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 error.
ERRORS See open(2).
VERSIONS Glibc support for posix_openpt() has been provided since version 2.2.1.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌───────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├───────────────┼───────────────┼─────────┤ │posix_openpt() │ Thread safety │ MT-Safe │ └───────────────┴───────────────┴─────────┘
CONFORMING TO POSIX.1-2001, POSIX.1-2008. posix_openpt() is part of the UNIX 98 pseudoterminal support (see pts(4)).
NOTES Some older UNIX implementations that support System V (aka UNIX 98) pseudoterminals don't have this function, but it is easy to implement: int posix_openpt(int flags) { 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 ALSO open(2), getpt(3), grantpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
2015-08-08 POSIX_OPENPT(3)
This manual Reference Other manuals
posix_openpt(3) referred by getpt(3) | grantpt(3) | ptsname(3) | pty(7) | unlockpt(3)
refer to attributes(7) | feature_test_macros(7) | getpt(3) | grantpt(3) | open(2) | pts(4) | ptsname(3) | pty(7) | unlockpt(3)