mirror of https://github.com/mkerrisk/man-pages
70 lines
1.6 KiB
Groff
70 lines
1.6 KiB
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
|
|
.\" This page is in the public domain. - aeb
|
|
.\"
|
|
.TH GRANTPT 3 2008-06-14 "GNU" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
grantpt \- grant access to the slave pseudo-terminal
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.B #define _XOPEN_SOURCE
|
|
.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 pseudo-terminal device
|
|
(pty) corresponding to the master pty 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., \fItty\fP).
|
|
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 pty 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 pty.
|
|
.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 pty 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 feature_test_macros (7),
|
|
.BR pty (7)
|