1POSIX_OPENPT(3) Linux Programmer's Manual POSIX_OPENPT(3)
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6 posix_openpt - open a pseudo-terminal device
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9 #include <stdlib.h>
10 #include <fcntl.h>
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12 int posix_openpt(int flags);
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14 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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16 posix_openpt(): _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
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19 The posix_openpt() function opens an unused pseudo-terminal master
20 device, returning a file descriptor that can be used to refer to that
21 device.
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23 The flags argument is a bit mask that ORs together zero or more of the
24 following flags:
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26 O_RDWR Open the device for both reading and writing. It is usual to
27 specify this flag.
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29 O_NOCTTY
30 Do not make this device the controlling terminal for the
31 process.
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34 On success, posix_openpt() returns a non-negative file descriptor which
35 is the lowest numbered unused descriptor. On failure, -1 is returned,
36 and errno is set to indicate the error.
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39 See open(2).
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42 Glibc support for posix_openpt() has been provided since version 2.2.1.
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45 posix_openpt() is part of the Unix98 pseudo-terminal support (see
46 pts(4)). This function is specified in POSIX.1-2001.
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49 This function is a recent invention in POSIX. Some Unix implementa‐
50 tions that support System V (aka Unix 98) pseudo-terminals don't have
51 this function, but it is easy to implement:
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53 int
54 posix_openpt(int flags)
55 {
56 return open("/dev/ptmx", flags);
57 }
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60 open(2), getpt(3), grantpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
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63 This page is part of release 3.22 of the Linux man-pages project. A
64 description of the project, and information about reporting bugs, can
65 be found at http://www.kernel.org/doc/man-pages/.
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69 2007-07-26 POSIX_OPENPT(3)