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getpt(3) [bsd man page]

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

NAME
getpt - open the pseudoterminal master (PTM) SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int getpt(void); DESCRIPTION
getpt() opens a pseudoterminal master and returns its file descriptor. It is equivalent to open(/dev/ptmx, O_RDWR | O_NOCTTY); on Linux systems, though the pseudoterminal master is located elsewhere on some systems that use GNU Libc. RETURN VALUE
getpt() returns an open file descriptor upon successful completion. Otherwise, it returns -1 and sets errno to indicate the error. ERRORS
getpt() can fail with various errors described in open(2). VERSIONS
getpt() is provided in glibc since version 2.1. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------+---------------+---------+ |Interface | Attribute | Value | +----------+---------------+---------+ |getpt() | Thread safety | MT-Safe | +----------+---------------+---------+ CONFORMING TO
getpt() is glibc-specific; use posix_openpt(3) instead. SEE ALSO
grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7) COLOPHON
This page is part of release 4.15 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 https://www.kernel.org/doc/man-pages/. GNU
2015-03-02 GETPT(3)

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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 numbered unused file 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 4.15 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 https://www.kernel.org/doc/man-pages/. 2017-09-15 POSIX_OPENPT(3)

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