SuSE 11.3 - man page for grantpt (suse section 3)
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GRANTPT(3) Linux Programmer's Manual GRANTPT(3)
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
When successful, grantpt() returns 0. Otherwise, it returns -1 and sets errno appropri-
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), feature_test_macros(7), pty(7)
This page is part of release 3.25 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at http://www.ker-
GNU 2008-06-14 GRANTPT(3)
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