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           Glibc 2.23 and earlier:
20               _XOPEN_SOURCE
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DESCRIPTION

23       The  unlockpt() function unlocks the slave pseudoterminal device corre‐
24       sponding to the master pseudoterminal referred to by the file  descrip‐
25       tor 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 to indicate the error.
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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 at‐
44       tributes(7).
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46       ┌────────────────────────────────────────────┬───────────────┬─────────┐
47       │Interface                                   │ Attribute     │ Value   │
48       ├────────────────────────────────────────────┼───────────────┼─────────┤
49       │unlockpt()                                  │ Thread safety │ MT-Safe │
50       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

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

59       This page is part of release 5.12 of the Linux  man-pages  project.   A
60       description  of  the project, information about reporting bugs, and the
61       latest    version    of    this    page,    can     be     found     at
62       https://www.kernel.org/doc/man-pages/.
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66                                  2021-03-22                       UNLOCKPT(3)