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

6       getpt - open a new pseudoterminal master
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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 new pseudoterminal device and returns a file descriptor
16       that refers to that device.  It is equivalent to opening the pseudoter‐
17       minal multiplexor device
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19           open("/dev/ptmx", O_RDWR);
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21       on  Linux  systems, though the pseudoterminal multiplexor device is lo‐
22       cated elsewhere on some systems that use the GNU C library.
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RETURN VALUE

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

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

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

35       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
36       tributes(7).
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38       ┌──────────┬───────────────┬─────────┐
39       │Interface │ Attribute     │ Value   │
40       ├──────────┼───────────────┼─────────┤
41       │getpt()   │ Thread safety │ MT-Safe │
42       └──────────┴───────────────┴─────────┘

CONFORMING TO

44       getpt() is glibc-specific; use posix_openpt(3) instead.
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SEE ALSO

47       grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)
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COLOPHON

50       This page is part of release 5.10 of the Linux  man-pages  project.   A
51       description  of  the project, information about reporting bugs, and the
52       latest    version    of    this    page,    can     be     found     at
53       https://www.kernel.org/doc/man-pages/.
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57GNU                               2020-08-13                          GETPT(3)
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