diff options
Diffstat (limited to 'REORG.TODO/hurd/hurdioctl.c')
| -rw-r--r-- | REORG.TODO/hurd/hurdioctl.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/REORG.TODO/hurd/hurdioctl.c b/REORG.TODO/hurd/hurdioctl.c new file mode 100644 index 0000000000..73ec3ea3cc --- /dev/null +++ b/REORG.TODO/hurd/hurdioctl.c @@ -0,0 +1,331 @@ +/* ioctl commands which must be done in the C library. + Copyright (C) 1994-2017 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <hurd.h> +#include <hurd/fd.h> +#include <sys/ioctl.h> +#include <hurd/ioctl.h> +#include <string.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; + + /* Mask off the type bits, so that we see requests in a single group as a + contiguous block of values. */ + request = _IOC_NOTYPE (request); + + 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 = ENOTTY; + 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_dfail (fd, err) : 0; +} + +_HURD_HANDLE_IOCTLS (fioctl, FIOGETOWN, FIONREAD); + + +static int +fioclex (int fd, + int request) +{ + int flag; + + switch (request) + { + default: + return __hurd_fail (ENOTTY); + 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> +#include <hurd/tioctl.h> + +/* Install a new CTTYID port, atomically updating the dtable appropriately. + This consumes the send right passed in. */ + +void +_hurd_locked_install_cttyid (mach_port_t cttyid) +{ + mach_port_t old; + struct hurd_port *const port = &_hurd_ports[INIT_PORT_CTTYID]; + struct hurd_userlink ulink; + int i; + + /* Install the new cttyid port, and preserve it with a ulink. + We unroll the _hurd_port_set + _hurd_port_get here so that + there is no window where the cell is unlocked and CTTYID could + be changed by another thread. (We also delay the deallocation + of the old port until the end, to minimize the duration of the + critical section.) + + It is important that changing the cttyid port is only ever done by + holding the dtable lock continuously while updating the port cell and + re-ctty'ing the dtable; dtable.c assumes we do this. Otherwise, the + pgrp-change notification code in dtable.c has to worry about racing + against us here in odd situations. The one exception to this is + setsid, which holds the dtable lock while changing the pgrp and + clearing the cttyid port, and then unlocks the dtable lock to allow + + + */ + + __spin_lock (&port->lock); + old = _hurd_userlink_clear (&port->users) ? port->port : MACH_PORT_NULL; + port->port = cttyid; + cttyid = _hurd_port_locked_get (port, &ulink); + + for (i = 0; i < _hurd_dtablesize; ++i) + { + struct hurd_fd *const d = _hurd_dtable[i]; + mach_port_t newctty = MACH_PORT_NULL; + + if (d == NULL) + /* Nothing to do for an unused descriptor cell. */ + continue; + + if (cttyid != MACH_PORT_NULL) + /* We do have some controlling tty. */ + 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 (), id); + } + 0; + })); + + /* Install the new ctty port. */ + _hurd_port_set (&d->ctty, newctty); + } + + __mutex_unlock (&_hurd_dtable_lock); + + if (old != MACH_PORT_NULL) + __mach_port_deallocate (__mach_task_self (), old); + _hurd_port_free (port, &ulink, cttyid); +} + +static void +install_ctty (mach_port_t cttyid) +{ + HURD_CRITICAL_BEGIN; + __mutex_lock (&_hurd_dtable_lock); + _hurd_locked_install_cttyid (cttyid); + 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. */ + install_ctty (cttyid); + + return 0; +} + + +static inline error_t +do_tiocsctty (io_t port, io_t ctty) +{ + mach_port_t cttyid; + error_t err; + + if (ctty != MACH_PORT_NULL) + /* PORT is already the ctty. Nothing to do. */ + return 0; + + /* Get PORT's cttyid port. */ + err = __term_getctty (port, &cttyid); + if (err) + return err; + + /* Change the terminal's pgrp to ours. */ + err = __tioctl_tiocspgrp (port, _hurd_pgrp); + if (err) + __mach_port_deallocate (__mach_task_self (), cttyid); + else + /* Make it our own. */ + install_ctty (cttyid); + + return err; +} + +/* Make FD be the controlling terminal. + This function is called for `ioctl (fd, TCIOSCTTY)'. */ + +static int +tiocsctty (int fd, + int request) /* Always TIOCSCTTY. */ +{ + return __hurd_fail (HURD_DPORT_USE (fd, do_tiocsctty (port, ctty))); +} +_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. */ + install_ctty (MACH_PORT_NULL); + + return 0; +} +_HURD_HANDLE_IOCTL (tiocnotty, TIOCNOTTY); + +#include <hurd/pfinet.h> +#include <net/if.h> +#include <netinet/in.h> + +/* Fill in the buffer IFC->IFC_BUF of length IFC->IFC_LEN with a list + of ifr structures, one for each network interface. */ +static int +siocgifconf (int fd, int request, struct ifconf *ifc) +{ + error_t err; + size_t data_len = ifc->ifc_len; + char *data = ifc->ifc_buf; + + if (data_len <= 0) + return 0; + + err = HURD_DPORT_USE (fd, __pfinet_siocgifconf (port, ifc->ifc_len, + &data, &data_len)); + if (data_len < ifc->ifc_len) + ifc->ifc_len = data_len; + if (data != ifc->ifc_buf) + { + memcpy (ifc->ifc_buf, data, ifc->ifc_len); + __vm_deallocate (__mach_task_self (), (vm_address_t) data, data_len); + } + return err ? __hurd_dfail (fd, err) : 0; +} +_HURD_HANDLE_IOCTL (siocgifconf, SIOCGIFCONF); |