grantpt(3C) Standard C Library Functions grantpt(3C)NAMEgrantpt - grant access to the slave pseudo-terminal device
SYNOPSIS
#include <stdlib.h>
int grantpt(int fildes);
DESCRIPTION
The grantpt() function changes the mode and ownership of the slave
pseudo-terminal device associated with its master pseudo-terminal
counterpart. fildes is the file descriptor returned from a successful
open of the master pseudo-terminal device. A setuid root program (see
setuid(2)) is invoked to change the permissions. The user ID of the
slave is set to the real UID of the calling process and the group ID is
set to a reserved group. The permission mode of the slave pseudo-termi‐
nal is set to readable and writable by the owner and writable by the
group.
RETURN VALUES
Upon successful completion, grantpt() returns 0. Otherwise, it returns
−1 and sets errno to indicate the error.
ERRORS
The grantpt() function may fail if:
EBADF The fildes argument is not a valid open file descrip‐
tor.
EINVAL The fildes argument is not associated with a master
pseudo-terminal device.
EACCES The corresponding slave pseudo-terminal device could
not be accessed.
USAGE
The grantpt() function will fail if it is unable to successfully invoke
the setuid root program. It may also fail if the application has
installed a signal handler to catch SIGCHLD signals.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOopen(2), setuid(2), ptsname(3C), unlockpt(3C), attributes(5), stan‐
dards(5)
STREAMS Programming Guide
SunOS 5.10 29 Dec 1996 grantpt(3C)
