diff options
Diffstat (limited to 'trans/proxy-defpager.c')
| -rw-r--r-- | trans/proxy-defpager.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/trans/proxy-defpager.c b/trans/proxy-defpager.c new file mode 100644 index 00000000..0a5ab65e --- /dev/null +++ b/trans/proxy-defpager.c @@ -0,0 +1,278 @@ +/* A translator for providing access to Mach default_pager.defs control calls + + Copyright (C) 2002, 2007 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This program 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <hurd/trivfs.h> +#include <unistd.h> +#include <fcntl.h> +#include <argp.h> +#include <error.h> +#include <version.h> +#include <hurd/paths.h> + +#include "default_pager_S.h" +#include "default_pager_U.h" + +static mach_port_t real_defpager, dev_master; + +static error_t +allowed (mach_port_t port, int mode) +{ + struct trivfs_protid *cred = ports_lookup_port + (0, port, trivfs_protid_portclasses[0]); + if (!cred) + return MIG_BAD_ID; + error_t result = (cred->po->openmodes & mode) ? 0 : EACCES; + ports_port_deref (cred); + return result; +} + +kern_return_t +S_default_pager_object_create (mach_port_t default_pager, + memory_object_t *memory_object, + vm_size_t object_size) +{ + return allowed (default_pager, O_EXEC) + ?: default_pager_object_create (real_defpager, memory_object, object_size); +} + +kern_return_t +S_default_pager_info (mach_port_t default_pager, default_pager_info_t *info) +{ + return allowed (default_pager, O_READ) + ?: default_pager_info (real_defpager, info); +} + +kern_return_t +S_default_pager_objects (mach_port_t default_pager, + default_pager_object_array_t *objects, + mach_msg_type_number_t *objectsCnt, + mach_port_array_t *ports, + mach_msg_type_number_t *portsCnt) +{ + return allowed (default_pager, O_WRITE) + ?: default_pager_objects (real_defpager, + objects, objectsCnt, ports, portsCnt); +} + +kern_return_t +S_default_pager_object_pages (mach_port_t default_pager, + mach_port_t memory_object, + default_pager_page_array_t *pages, + mach_msg_type_number_t *pagesCnt) +{ + return allowed (default_pager, O_WRITE) + ?: default_pager_object_pages (real_defpager, memory_object, + pages, pagesCnt); +} + + +kern_return_t +S_default_pager_paging_file (mach_port_t default_pager, + mach_port_t master_device_port, + default_pager_filename_t filename, + boolean_t add) +{ + return allowed (default_pager, O_WRITE) + ?: default_pager_paging_file (real_defpager, dev_master, filename, add) + ?: mach_port_deallocate (mach_task_self (), master_device_port); +} + +kern_return_t +S_default_pager_paging_storage (mach_port_t default_pager, + mach_port_t device, + recnum_t *runs, mach_msg_type_number_t nruns, + default_pager_filename_t name, + boolean_t add) +{ + return allowed (default_pager, O_WRITE) + ?: default_pager_paging_storage (real_defpager, dev_master, + runs, nruns, name, add) + ?: mach_port_deallocate (mach_task_self (), device); +} + +kern_return_t +S_default_pager_object_set_size (mach_port_t memory_object, + mach_port_seqno_t seqno, + vm_size_t object_size_limit) +{ + /* This is sent to an object, not the control port. */ + return MIG_BAD_ID; +} + + +/* Trivfs hooks */ + +int trivfs_fstype = FSTYPE_MISC; +int trivfs_fsid; + +int trivfs_support_read = 1; +int trivfs_support_write = 1; +int trivfs_support_exec = 1; + +int trivfs_allow_open = O_READ | O_WRITE | O_EXEC; + +void +trivfs_modify_stat (struct trivfs_protid *cred, struct stat *st) +{ + st->st_blksize = vm_page_size * 256; /* Make transfers LARRRRRGE */ + + st->st_size = 0; + st->st_blocks = 0; + + st->st_mode &= ~S_IFMT; + st->st_mode |= S_IFCHR; +} + + +error_t +trivfs_goaway (struct trivfs_control *fsys, int flags) +{ + exit (0); +} + +kern_return_t +trivfs_S_io_read (struct trivfs_protid *cred, + mach_port_t reply, mach_msg_type_name_t replytype, + char **data, + mach_msg_type_number_t *datalen, + loff_t offs, + mach_msg_type_number_t amt) +{ + if (!cred) + return EOPNOTSUPP; + return EIO; +} + +kern_return_t +trivfs_S_io_write (struct trivfs_protid *cred, + mach_port_t reply, mach_msg_type_name_t replytype, + char *data, mach_msg_type_number_t datalen, + loff_t offs, mach_msg_type_number_t *amt) +{ + if (!cred) + return EOPNOTSUPP; + return EIO; +} + +kern_return_t +trivfs_S_io_get_openmodes (struct trivfs_protid *cred, + mach_port_t reply, mach_msg_type_name_t replytype, + int *bits) +{ + if (!cred) + return EOPNOTSUPP; + else + { + *bits = cred->po->openmodes; + return 0; + } +} + +error_t +trivfs_S_io_set_all_openmodes (struct trivfs_protid *cred, + mach_port_t reply, + mach_msg_type_name_t replytype, + int mode) +{ + if (!cred) + return EOPNOTSUPP; + else + return 0; +} + +kern_return_t +trivfs_S_io_set_some_openmodes (struct trivfs_protid *cred, + mach_port_t reply, + mach_msg_type_name_t replytype, + int bits) +{ + if (!cred) + return EOPNOTSUPP; + else + return 0; +} + +kern_return_t +trivfs_S_io_clear_some_openmodes (struct trivfs_protid *cred, + mach_port_t reply, + mach_msg_type_name_t replytype, + int bits) +{ + if (!cred) + return EOPNOTSUPP; + else + return 0; +} + +const char *argp_program_version = STANDARD_HURD_VERSION (proxy-defpager); + +static const struct argp argp = +{doc: "\ +Access to control interfaces of Mach default pager.\n\ +This translator should normally be set on " _SERVERS_DEFPAGER "."}; + +int +proxy_defpager_demuxer (mach_msg_header_t *inp, + mach_msg_header_t *outp) +{ + extern int default_pager_server (mach_msg_header_t *, mach_msg_header_t *); + + return default_pager_server (inp, outp) + || trivfs_demuxer (inp, outp); +} + +int +main (int argc, char **argv) +{ + error_t err; + mach_port_t bootstrap; + struct trivfs_control *fsys; + mach_port_t host_priv; + + argp_parse (&argp, argc, argv, 0, 0, 0); + + err = get_privileged_ports (&host_priv, &dev_master); + if (err) + error (2, err, "cannot get privileged ports"); + real_defpager = MACH_PORT_NULL; + err = vm_set_default_memory_manager (host_priv, &real_defpager); + mach_port_deallocate (mach_task_self (), host_priv); + if (err) + error (3, err, "vm_set_default_memory_manager"); + if (real_defpager == MACH_PORT_NULL) + error (1, 0, "no default memory manager set!"); + + task_get_bootstrap_port (mach_task_self (), &bootstrap); + if (bootstrap == MACH_PORT_NULL) + error (1, 0, "Must be started as a translator"); + + trivfs_fsid = getpid (); + + /* Reply to our parent. */ + err = trivfs_startup (bootstrap, 0, 0, 0, 0, 0, &fsys); + mach_port_deallocate (mach_task_self (), bootstrap); + if (err) + error (4, err, "Contacting parent"); + + /* Launch. */ + ports_manage_port_operations_multithread (fsys->pi.bucket, + proxy_defpager_demuxer, + 2 * 60 * 1000, 0, 0); + + return 0; +} |