1UNLOCKPT(3) Linux Programmer's Manual UNLOCKPT(3)
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6 unlockpt - unlock a pseudoterminal master/slave pair
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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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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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31 When successful, unlockpt() returns 0. Otherwise, it returns -1 and
32 sets errno appropriately.
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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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40 unlockpt() is provided in glibc since version 2.1.
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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 └───────────┴───────────────┴─────────┘
52 POSIX.1-2001, POSIX.1-2008.
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55 grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)
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58 This page is part of release 5.04 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)