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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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grantpt(3) Library Functions Manual grantpt(3)
grantpt - grant access to the slave pseudoterminal
Standard C library (libc, -lc)
#define _XOPEN_SOURCE
#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
glibc 2.23 and earlier:
_XOPEN_SOURCE
The grantpt() function changes the mode and owner of the slave
pseudoterminal device corresponding to the master pseudoterminal
referred to by the file descriptor 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
installed to catch SIGCHLD signals.
When successful, grantpt() returns 0. Otherwise, it returns -1
and sets errno to indicate the error.
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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────┼───────────────┼────────────────┤
│ grantpt() │ Thread safety │ MT-Safe locale │
└──────────────────────────────┴───────────────┴────────────────┘
POSIX.1-2008.
glibc 2.1. POSIX.1-2001.
This is part of the UNIX 98 pseudoterminal support, see pts(4).
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 —with permissions
configured on pty allocation, as is the case on Linux— or an
ioctl(2).
open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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man-pages@man7.org
Linux man-pages 6.9.1 2024-05-26 grantpt(3)
Pages that refer to this page: getpt(3), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
Copyright and license for this manual page
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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