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grantpt(S)


grantpt -- grant access to the slave pseudo-terminal device

Syntax

cc ...-lc

# include <stdlib.h>

int grantpt(int fildes);

Description

The function grantpt(S) changes the mode and ownership of the slave pseudo-terminal device associated with its master pseudo-terminal counter part. fildes is a file descriptor referencing the master pseudo-terminal device.

A setuid(S) root program is invoked to change the permissions. The user ID of the slave is set to the real owner 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, writable by the owner and writable by the group.

Return values

On successful completion, grantpt( ) returns 0; otherwise it returns -1.

Diagnostics

Under the following conditions, grantpt( ) fails and sets errno to:

[EBADF]
fildes is not a valid open file descriptor.

[EINVAL]
fildes is not associated with a master pseudo-terminal device.

[EACCESS]
the corresponding slave device could not be accessed.

Warning

The current implementation of grantpt( ) does a fork(S)/exec(S) internally. If the caller has SIGCHLD (or SIGCLD) signal handlers set up, these handlers will be triggered by the call on grantpt( ). See sigaction(S) and siginfo(FP) for further information.

See also

exec(S), fork(S), open(S), ptsname(S), setuid(S), sigaction(S), siginfo(FP), unlockpt(S)

Standards conformance

grantpt(S) is conformant with:

X/Open CAE Specification, System Interfaces and Headers, Issue 4, Version 2.


© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003