diff options
Diffstat (limited to 'hurd/hurdioctl.c')
| -rw-r--r-- | hurd/hurdioctl.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/hurd/hurdioctl.c b/hurd/hurdioctl.c new file mode 100644 index 0000000..5a41eb1 --- /dev/null +++ b/hurd/hurdioctl.c @@ -0,0 +1,264 @@ +/* ioctl commands which must be done in the C library. +Copyright (C) 1994, 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <hurd.h> +#include <hurd/fd.h> +#include <sys/ioctl.h> +#include <hurd/ioctl.h> + + + +/* Symbol set of ioctl handler lists. If there are user-registered + handlers, one of these lists will contain them. The other lists are + handlers built into the library. */ +symbol_set_define (_hurd_ioctl_handler_lists) + +/* Look up REQUEST in the set of handlers. */ +ioctl_handler_t +_hurd_lookup_ioctl_handler (int request) +{ + void *const *ptr; + const struct ioctl_handler *h; + + for (ptr = symbol_set_first_element (_hurd_ioctl_handler_lists); + !symbol_set_end_p (_hurd_ioctl_handler_lists, ptr); + ++ptr) + for (h = *ptr; h != NULL; h = h->next) + if (request >= h->first_request && request <= h->last_request) + return h->handler; + + return NULL; +} + +#include <fcntl.h> + +/* Find out how many bytes may be read from FD without blocking. */ + +static int +fioctl (int fd, + int request, + int *arg) +{ + error_t err; + + *(volatile int *) arg = *arg; + + switch (request) + { + default: + err = EGRATUITOUS; + break; + + case FIONREAD: + { + mach_msg_type_number_t navail; + err = HURD_DPORT_USE (fd, __io_readable (port, &navail)); + if (!err) + *arg = (int) navail; + } + break; + + case FIONBIO: + err = HURD_DPORT_USE (fd, (*arg ? + __io_set_some_openmodes : + __io_clear_some_openmodes) + (port, O_NONBLOCK)); + break; + + case FIOASYNC: + err = HURD_DPORT_USE (fd, (*arg ? + __io_set_some_openmodes : + __io_clear_some_openmodes) + (port, O_ASYNC)); + break; + + case FIOSETOWN: + err = HURD_DPORT_USE (fd, __io_mod_owner (port, *arg)); + break; + + case FIOGETOWN: + err = HURD_DPORT_USE (fd, __io_get_owner (port, arg)); + break; + } + + return err ? __hurd_fail (err) : 0; +} + +_HURD_HANDLE_IOCTLS (fioctl, FIOGETOWN, FIONREAD); + + +static int +fioclex (int fd, + int request) +{ + int flag; + + switch (request) + { + default: + return __hurd_fail (EGRATUITOUS); + case FIOCLEX: + flag = FD_CLOEXEC; + break; + case FIONCLEX: + flag = 0; + break; + } + + return __fcntl (fd, F_SETFD, flag); +} +_HURD_HANDLE_IOCTLS (fioclex, FIOCLEX, FIONCLEX); + +#include <hurd/term.h> + +static void +rectty_dtable (mach_port_t cttyid) +{ + int i; + + HURD_CRITICAL_BEGIN; + __mutex_lock (&_hurd_dtable_lock); + + for (i = 0; i < _hurd_dtablesize; ++i) + { + struct hurd_fd *const d = _hurd_dtable[i]; + mach_port_t newctty; + + if (d == NULL) + /* Nothing to do for an unused descriptor cell. */ + continue; + + if (cttyid == MACH_PORT_NULL) + /* We now have no controlling tty at all. */ + newctty = MACH_PORT_NULL; + else + HURD_PORT_USE (&d->port, + ({ mach_port_t id; + /* Get the io object's cttyid port. */ + if (! __term_getctty (port, &id)) + { + if (id == cttyid && /* Is it ours? */ + /* Get the ctty io port. */ + __term_open_ctty (port, + _hurd_pid, _hurd_pgrp, + &newctty)) + /* XXX it is our ctty but the call failed? */ + newctty = MACH_PORT_NULL; + __mach_port_deallocate + (__mach_task_self (), (mach_port_t) id); + } + else + newctty = MACH_PORT_NULL; + 0; + })); + + /* Install the new ctty port. */ + _hurd_port_set (&d->ctty, newctty); + } + + __mutex_unlock (&_hurd_dtable_lock); + HURD_CRITICAL_END; +} + + +/* Called when we have received a message saying to use a new ctty ID port. */ + +error_t +_hurd_setcttyid (mach_port_t cttyid) +{ + error_t err; + + if (cttyid != MACH_PORT_NULL) + { + /* Give the new send right a user reference. + This is a good way to check that it is valid. */ + if (err = __mach_port_mod_refs (__mach_task_self (), cttyid, + MACH_PORT_RIGHT_SEND, 1)) + return err; + } + + /* Install the port, consuming the reference we just created. */ + _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid); + + /* Reset all the ctty ports in all the descriptors. */ + __USEPORT (CTTYID, (rectty_dtable (cttyid), 0)); + + return 0; +} + + +/* Make FD be the controlling terminal. + This function is called for `ioctl (fd, TCIOSCTTY)'. */ + +static int +tiocsctty (int fd, + int request) /* Always TIOCSCTTY. */ +{ + mach_port_t cttyid; + error_t err; + + /* Get FD's cttyid port, unless it is already ours. */ + err = HURD_DPORT_USE (fd, ctty != MACH_PORT_NULL ? EADDRINUSE : + __term_getctty (port, &cttyid)); + if (err == EADDRINUSE) + /* FD is already the ctty. Nothing to do. */ + return 0; + else if (err) + return __hurd_fail (err); + + /* Make it our own. */ + _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid); + + /* Reset all the ctty ports in all the descriptors. */ + __USEPORT (CTTYID, (rectty_dtable (cttyid), 0)); + + return 0; +} +_HURD_HANDLE_IOCTL (tiocsctty, TIOCSCTTY); + +/* Dissociate from the controlling terminal. */ + +static int +tiocnotty (int fd, + int request) /* Always TIOCNOTTY. */ +{ + mach_port_t fd_cttyid; + error_t err; + + if (err = HURD_DPORT_USE (fd, __term_getctty (port, &fd_cttyid))) + return __hurd_fail (err); + + if (__USEPORT (CTTYID, port != fd_cttyid)) + err = EINVAL; + + __mach_port_deallocate (__mach_task_self (), fd_cttyid); + + if (err) + return __hurd_fail (err); + + /* Clear our cttyid port cell. */ + _hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], MACH_PORT_NULL); + + /* Reset all the ctty ports in all the descriptors. */ + + __USEPORT (CTTYID, (rectty_dtable (MACH_PORT_NULL), 0)); + + return 0; +} +_HURD_HANDLE_IOCTL (tiocnotty, TIOCNOTTY); |