grantpt - grant access to the slave pseudo-terminal
int grantpt(int fd);
The grantpt() function changes the mode and owner of the slave pseudo-
terminal device (pty) corresponding to the master pty 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 signals.
When successful, grantpt() returns 0. Otherwise, it returns -1 and
sets errno appropriately.
EACCES The corresponding slave pty 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 pty.
grantpt() is provided in glibc since version 2.1.
This is part of the Unix98 pty 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),
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