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-'\" t
-.\" %%%LICENSE_START(PUBLIC_DOMAIN)
-.\" This page is in the public domain. - aeb
-.\" %%%LICENSE_END
-.\"
-.TH grantpt 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-grantpt \- grant access to the slave pseudoterminal
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.P
-.BI "int grantpt(int " fd ");"
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR grantpt ():
-.nf
-    Since glibc 2.24:
-        _XOPEN_SOURCE >= 500
-.\"        || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
-    glibc 2.23 and earlier:
-        _XOPEN_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR grantpt ()
-function changes the mode and owner of the slave pseudoterminal device
-corresponding to the master pseudoterminal referred to by the file descriptor
-.IR fd .
-The user ID of the slave is set to the real UID of the calling process.
-The group ID is set to an unspecified value (e.g.,
-.IR tty ).
-The mode of the slave is set to 0620 (crw\-\-w\-\-\-\-).
-.P
-The behavior of
-.BR grantpt ()
-is unspecified if a signal handler is installed to catch
-.B SIGCHLD
-signals.
-.SH RETURN VALUE
-When successful,
-.BR grantpt ()
-returns 0.
-Otherwise, it returns \-1 and sets
-.I errno
-to indicate the error.
-.SH ERRORS
-.TP
-.B EACCES
-The corresponding slave pseudoterminal could not be accessed.
-.TP
-.B EBADF
-The
-.I fd
-argument is not a valid open file descriptor.
-.TP
-.B EINVAL
-The
-.I fd
-argument is valid but not associated with a master pseudoterminal.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR grantpt ()
-T}	Thread safety	MT-Safe locale
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-POSIX.1-2001.
-.P
-This is part of the UNIX 98 pseudoterminal support, see
-.BR pts (4).
-.P
-Historical systems implemented this function via a set-user-ID helper binary
-called "pt_chown".
-glibc on Linux before glibc 2.33 could do so as well,
-in order to support configurations with only BSD pseudoterminals;
-this support has been removed.
-On modern systems this is either a no-op
-\[em]with permissions configured on pty allocation, as is the case on Linux\[em]
-or an
-.BR ioctl (2).
-.SH SEE ALSO
-.BR open (2),
-.BR posix_openpt (3),
-.BR ptsname (3),
-.BR unlockpt (3),
-.BR pts (4),
-.BR pty (7)