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Standard C Library Functionsgrantpt(3C)


NAME

 grantpt - 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 counter part. 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-terminal 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 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.

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 TYPEATTRIBUTE VALUE
MT-LevelSafe

SEE ALSO

 

open(2), setuid(2), ptsname(3C), unlockpt(3C), attributes(5)

STREAMS Programming Guide


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.