unlockpt(3)

1UNLOCKPT(3)                Linux Programmer's Manual               UNLOCKPT(3)
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NAME

6       unlockpt - unlock a pseudoterminal master/slave pair
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SYNOPSIS

9       #define _XOPEN_SOURCE
10       #include <stdlib.h>
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12       int unlockpt(int fd);
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14   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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16       unlockpt():
17           Since glibc 2.24:
18               _XOPEN_SOURCE >= 500 ||
19                   (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
20           Glibc 2.23 and earlier:
21               _XOPEN_SOURCE
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DESCRIPTION

24       The  unlockpt() function unlocks the slave pseudoterminal device corre‐
25       sponding to the master pseudoterminal referred to by fd.
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27       unlockpt() should be called before opening the slave side  of  a  pseu‐
28       doterminal.
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RETURN VALUE

31       When  successful,  unlockpt()  returns 0.  Otherwise, it returns -1 and
32       sets errno appropriately.
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ERRORS

35       EBADF  The fd argument is not a file descriptor open for writing.
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37       EINVAL The fd argument is not associated with a master pseudoterminal.
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VERSIONS

40       unlockpt() is provided in glibc since version 2.1.
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ATTRIBUTES

43       For  an  explanation  of  the  terms  used   in   this   section,   see
44       attributes(7).
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46       ┌───────────┬───────────────┬─────────┐
47       │Interface  │ Attribute     │ Value   │
48       ├───────────┼───────────────┼─────────┤
49       │unlockpt() │ Thread safety │ MT-Safe │
50       └───────────┴───────────────┴─────────┘

CONFORMING TO

52       POSIX.1-2001, POSIX.1-2008.
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COLOPHON

58       This  page  is  part of release 4.16 of the Linux man-pages project.  A
59       description of the project, information about reporting bugs,  and  the
60       latest     version     of     this    page,    can    be    found    at
61       https://www.kernel.org/doc/man-pages/.
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65                                  2017-07-13                       UNLOCKPT(3)