CentOS 7.0 - man page for grantpt (centos section 3)
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GRANTPT(3) Linux Programmer's Manual GRANTPT(3)
grantpt - grant access to the slave pseudoterminal
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
int grantpt(int fd);
The grantpt() function changes the mode and owner of the slave pseudoterminal device cor-
responding to the master pseudoterminal referred 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 installed to catch SIGCHLD
When successful, grantpt() returns 0. Otherwise, it returns -1 and sets errno appropri-
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.
grantpt() is provided in glibc since version 2.1.
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". With Linux devpts no
such helper binary is required.
open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
This page is part of release 3.53 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
GNU 2008-06-14 GRANTPT(3)
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