NAME
grantpt —
grant access to a slave pseudo-terminal
device
LIBRARY
library “libc”
SYNOPSIS
#include
<stdlib.h>
int
grantpt(int
fildes);
DESCRIPTION
Thegrantpt()
function changes the mode and ownership of the slave pseudo-terminal device
that corresponds to the master pseudo-terminal device associated with
fildes to be owned by the real user id of the calling
process, group id of tty. The permissions are set to
readable and writable by owner, and writable by group. If the slave
pseudo-terminal device was being accessed by other file descriptors at the
time, all such access will be revoked.
RETURN VALUES
If successful, grantpt() returns 0;
otherwise a value of -1 is returned and errno is set
to indicate the error.
ERRORS
The grantpt() function will fail if:
- [
EACCESS] - the corresponding pseudo-terminal device could not be accessed.
- [
EBADF] - fildes is not a valid descriptor.
- [
EINVAL] - fildes is not associated with a master pseudo-terminal device.
NOTES
Setting the group to tty and revoking
accesses by other file descriptors are NetBSD
extensions. Calling grantpt() is equivalent to:
ioctl(fildes, TIOCGRANTPT, 0);
SEE ALSO
STANDARDS
The grantpt() function conforms to
IEEE Std 1003.1-2001 (“POSIX.1”). Its
first release was in X/Open Portability Guide
Issue 4, Version 2 (“XPG4.2”).