svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
grantpt(3)
GRANTPT(3) Linux Programmer's Manual GRANTPT(3)
NAME
grantpt - grant access to the slave pseudoterminal
SYNOPSIS
#include <stdlib.h>
int grantpt(int fd);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
grantpt():
Since glibc 2.24:
_XOPEN_SOURCE >= 500 ||
(_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
Glibc 2.23 and earlier:
_XOPEN_SOURCE
DESCRIPTION
The grantpt() function changes the mode and owner of the slave
pseudoterminal device corresponding to the master pseudoterminal re‐
ferred to by 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., tty). The mode of the slave is set to 0620 (crw--w----).
The behavior of grantpt() is unspecified if a signal handler is in‐
stalled to catch SIGCHLD signals.
RETURN VALUE
When successful, grantpt() returns 0. Otherwise, it returns -1 and
sets errno appropriately.
ERRORS
EACCES The corresponding slave pseudoterminal could not be accessed.
EBADF The fd argument is not a valid open file descriptor.
EINVAL The fd argument is valid but not associated with a master
pseudoterminal.
VERSIONS
grantpt() is provided in glibc since version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attrib‐
utes(7). allbox; lb lb lb l l l. Interface Attribute Value T{
grantpt() T} Thread safety MT-Safe locale
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
NOTES
This is part of the UNIX 98 pseudoterminal support, see pts(4).
Many systems implement this function via a set-user-ID helper binary
called "pt_chown". On Linux systems with a devpts filesystem (present
since Linux 2.2), the kernel normally sets the correct ownership and
permissions for the pseudoterminal slave when the master is opened
(posix_openpt(3)), so that nothing must be done by grantpt(). Thus, no
such helper binary is required (and indeed it is configured to be ab‐
sent during the glibc build that is typical on many systems).
SEE ALSO
open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
COLOPHON
This page is part of release 5.02 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 GRANTPT(3)