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unlockpt(3) [centos man page]

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

NAME
unlockpt - unlock a pseudoterminal master/slave pair SYNOPSIS
#define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int unlockpt(int fd); DESCRIPTION
The unlockpt() function unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by fd. unlockpt() should be called before opening the slave side of a pseudoterminal. RETURN VALUE
When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately. ERRORS
EBADF The fd argument is not a file descriptor open for writing. EINVAL The fd argument is not associated with a master pseudoterminal. VERSIONS
unlockpt() is provided in glibc since version 2.1. CONFORMING TO
POSIX.1-2001. SEE ALSO
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7) COLOPHON
This 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/. 2008-06-14 UNLOCKPT(3)

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

NAME
unlockpt - unlock a pseudoterminal master/slave pair SYNOPSIS
#define _XOPEN_SOURCE #include <stdlib.h> int unlockpt(int fd); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): unlockpt(): Since glibc 2.24: _XOPEN_SOURCE >= 500 || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) Glibc 2.23 and earlier: _XOPEN_SOURCE DESCRIPTION
The unlockpt() function unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by fd. unlockpt() should be called before opening the slave side of a pseudoterminal. RETURN VALUE
When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately. ERRORS
EBADF The fd argument is not a file descriptor open for writing. EINVAL The fd argument is not associated with a master pseudoterminal. VERSIONS
unlockpt() 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 | +-----------+---------------+---------+ |unlockpt() | Thread safety | MT-Safe | +-----------+---------------+---------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008. SEE ALSO
grantpt(3), posix_openpt(3), ptsname(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/. 2017-07-13 UNLOCKPT(3)
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