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[linuxjm/LDP_man-pages.git] / original / man3 / grantpt.3

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-.\" %%%LICENSE_START(PUBLIC_DOMAIN)
-.\" This page is in the public domain. - aeb
-.\" %%%LICENSE_END
-.\"
-.TH GRANTPT 3 2008-06-14 "GNU" "Linux Programmer's Manual"
-.SH NAME
-grantpt \- grant access to the slave pseudoterminal
-.SH SYNOPSIS
-.nf
-.BR "#define _XOPEN_SOURCE" "       /* See feature_test_macros(7) */"
-.br
-.B #include <stdlib.h>
-.sp
-.BI "int grantpt(int " fd ");"
-.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
-.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\-\-\-\-).
-.PP
-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
-appropriately.
-.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 VERSIONS
-.BR grantpt ()
-is provided in glibc since version 2.1.
-.SH CONFORMING TO
-POSIX.1-2001.
-.SH NOTES
-This is part of the UNIX 98 pseudoterminal support, see
-.BR pts (4).
-Many systems implement this function via a set-user-ID helper binary
-called "pt_chown".
-With Linux devpts no such helper binary is required.
-.SH SEE ALSO
-.BR open (2),
-.BR posix_openpt (3),
-.BR ptsname (3),
-.BR unlockpt (3),
-.BR pts (4),
-.BR pty (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.