grantpt(3) - NetBSD Manual Pages

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GRANTPT(3)              NetBSD Library Functions Manual             GRANTPT(3)


NAME

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


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <stdlib.h>

     int
     grantpt(int fildes);


DESCRIPTION

     The grantpt() 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-termi-
     nal 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

     ioctl(2), posix_openpt(3), ptsname(3), unlockpt(3)


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'').

NetBSD 3.1.1                     May 25, 2004                     NetBSD 3.1.1