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25 .TH POSIX_OPENPT 3 2010-10-04 "" "Linux Programmer's Manual"
27 posix_openpt \- open a pseudoterminal device
30 .B #include <stdlib.h>
33 .BI "int posix_openpt(int " flags ");"
37 Feature Test Macro Requirements for glibc (see
38 .BR feature_test_macros (7)):
43 _XOPEN_SOURCE\ >=\ 600
48 function opens an unused pseudoterminal master device, returning a
49 file descriptor that can be used to refer to that device.
53 argument is a bit mask that ORs together zero or more of
57 Open the device for both reading and writing.
58 It is usual to specify this flag.
61 Do not make this device the controlling terminal for the process.
65 returns a nonnegative file descriptor which is the lowest
66 numbered unused descriptor.
67 On failure, \-1 is returned, and
69 is set to indicate the error.
76 has been provided since version 2.2.1.
79 is part of the UNIX 98 pseudoterminal support (see
81 This function is specified in POSIX.1-2001.
83 This function is a recent invention in POSIX.
84 Some UNIX implementations that support System V
85 (aka UNIX 98) pseudoterminals don't have this function, but it
91 posix_openpt(int flags)
93 return open("/dev/ptmx", flags);