Linux 2.6 - man page for grantpt (linux section 3posix)
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GRANTPT(P) POSIX Programmer's Manual GRANTPT(P)
grantpt - grant access to the slave pseudo-terminal device
int grantpt(int fildes);
The grantpt() function shall change the mode and ownership of the slave pseudo-terminal
device associated with its master pseudo-terminal counterpart. The fildes argument is a
file descriptor that refers to a master pseudo-terminal device. The user ID of the slave
shall be set to the real UID of the calling process and the group ID shall be set to an
unspecified group ID. The permission mode of the slave pseudo-terminal shall be set to
readable and writable by the owner, and writable by the group.
The behavior of the grantpt() function is unspecified if the application has installed a
signal handler to catch SIGCHLD signals.
Upon successful completion, grantpt() shall return 0; otherwise, it shall return -1 and
set errno to indicate the error.
The grantpt() function may fail if:
EBADF The fildes argument is not a valid open file descriptor.
EINVAL The fildes argument is not associated with a master pseudo-terminal device.
EACCES The corresponding slave pseudo-terminal device could not be accessed.
The following sections are informative.
open() , ptsname() , unlockpt() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 GRANTPT(P)
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