getpt(3)

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

6       getpt - open the pseudoterminal master (PTM)
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SYNOPSIS

9       #define _GNU_SOURCE             /* See feature_test_macros(7) */
10       #include <stdlib.h>
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12       int getpt(void);
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DESCRIPTION

15       getpt()  opens a pseudoterminal master and returns its file descriptor.
16       It is equivalent to
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18           open(/dev/ptmx, O_RDWR | O_NOCTTY);
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20       on Linux systems, though the pseudoterminal master is located elsewhere
21       on some systems that use GNU Libc.
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RETURN VALUE

24       getpt()  returns  an  open  file descriptor upon successful completion.
25       Otherwise, it returns -1 and sets errno to indicate the error.
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ERRORS

28       getpt() can fail with various errors described in open(2).
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VERSIONS

31       getpt() is provided in glibc since version 2.1.
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ATTRIBUTES

34       For  an  explanation  of  the  terms  used   in   this   section,   see
35       attributes(7).
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37       ┌──────────┬───────────────┬─────────┐
38       │Interface │ Attribute     │ Value   │
39       ├──────────┼───────────────┼─────────┤
40       │getpt()   │ Thread safety │ MT-Safe │
41       └──────────┴───────────────┴─────────┘

CONFORMING TO

43       getpt() is glibc-specific; use posix_openpt(3) instead.
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COLOPHON

49       This  page  is  part of release 4.15 of the Linux man-pages project.  A
50       description of the project, information about reporting bugs,  and  the
51       latest     version     of     this    page,    can    be    found    at
52       https://www.kernel.org/doc/man-pages/.
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56GNU                               2015-03-02                          GETPT(3)