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.TH GRANTPT "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

This manual page is part of the POSIX Programmer's Manual.

The Linux implementation of this interface may differ (consult

the corresponding Linux manual page for details of Linux behavior),

or the interface may not be implemented on Linux.

.SH NAME

grantpt

\(em grant access to the slave pseudo-terminal device

.SH SYNOPSIS

.LP

.nf

#include <stdlib.h>

.P

int grantpt(int \fIfildes\fP);

.fi

.SH DESCRIPTION

The

\fIgrantpt\fR()

function shall change the mode and ownership of the slave pseudo-terminal

device associated with its master pseudo-terminal counterpart. The

.IR fildes

argument is a file descriptor that refers to a master

pseudo-terminal device. The user ID of the slave shall be set to the real

UID of the calling process and the group ID shall be set to an unspecified

group ID. The permission mode of the slave pseudo-terminal shall be set to

readable and writable by the owner, and writable by the group.

.P

The behavior of the

\fIgrantpt\fR()

function is unspecified if the application has installed a signal

handler to catch SIGCHLD signals.

.SH "RETURN VALUE"

Upon successful completion,

\fIgrantpt\fR()

shall return 0; otherwise, it shall return \(mi1 and set

.IR errno

to indicate the error.

.SH ERRORS

The

\fIgrantpt\fR()

function may fail if:

.TP

.BR EBADF

The

.IR fildes

argument is not a valid open file descriptor.

.TP

.BR EINVAL

The

.IR fildes

argument is not associated with a master pseudo-terminal device.

.TP

.BR EACCES

The corresponding slave pseudo-terminal device could not be accessed.

.LP

.IR "The following sections are informative."

.SH EXAMPLES

None.

.SH "APPLICATION USAGE"

None.

.SH RATIONALE

See the RATIONALE section for

.IR "\fIposix_openpt\fR\^(\|)".

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "\fIopen\fR\^(\|)",

.IR "\fIposix_openpt\fR\^(\|)",

.IR "\fIptsname\fR\^(\|)",

.IR "\fIunlockpt\fR\^(\|)"

.P

The Base Definitions volume of POSIX.1\(hy2008,

.IR "\fB<stdlib.h>\fP"

.SH COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form

from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology

-- Portable Operating System Interface (POSIX), The Open Group Base

Specifications Issue 7, Copyright (C) 2013 by the Institute of

Electrical and Electronics Engineers, Inc and The Open Group.

(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the

event of any discrepancy between this version and the original IEEE and

The Open Group Standard, the original IEEE and The Open Group Standard

is the referee document. The original Standard can be obtained online at

http://www.unix.org/online.html .

Any typographical or formatting errors that appear

in this page are most likely

to have been introduced during the conversion of the source files to

man page format. To report such errors, see

https://www.kernel.org/doc/man-pages/reporting_bugs.html .