1GETPT(3) Linux Programmer's Manual GETPT(3)
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6 getpt - open a new pseudoterminal master
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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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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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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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29 getpt() can fail with various errors described in open(2).
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32 getpt() is provided in glibc since version 2.1.
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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 └────────────────────────────────────────────┴───────────────┴─────────┘
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45 getpt() is glibc-specific; use posix_openpt(3) instead.
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48 grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)
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51 This page is part of release 5.13 of the Linux man-pages project. A
52 description of the project, information about reporting bugs, and the
53 latest version of this page, can be found at
54 https://www.kernel.org/doc/man-pages/.
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58GNU 2021-03-22 GETPT(3)