/* Implements the hurd io interface to devio. Copyright (C) 1995, 1996 Free Software Foundation, Inc. Written by Miles Bader 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 #include #include #include #include #include "open.h" #include "dev.h" #include "iostate.h" /* ---------------------------------------------------------------- */ /* Return objects mapping the data underlying this memory object. If the object can be read then memobjrd will be provided; if the object can be written then memobjwr will be provided. For objects where read data and write data are the same, these objects will be equal, otherwise they will be disjoint. Servers are permitted to implement io_map but not io_map_cntl. Some objects do not provide mapping; they will set none of the ports and return an error. Such objects can still be accessed by io_read and io_write. */ kern_return_t trivfs_S_io_map(struct trivfs_protid *cred, memory_object_t *rdobj, mach_msg_type_name_t *rdtype, memory_object_t *wrobj, mach_msg_type_name_t *wrtype) { if (!cred) return EOPNOTSUPP; else { mach_port_t memobj; struct open *open = (struct open *)cred->po->hook; error_t err = dev_get_memory_object(open->dev, &memobj); if (!err) { if (cred->po->openmodes & O_READ) { *rdobj = memobj; *rdtype = MACH_MSG_TYPE_MOVE_SEND; } else *rdobj = MACH_PORT_NULL; if (cred->po->openmodes & O_WRITE) { *wrobj = memobj; *wrtype = MACH_MSG_TYPE_MOVE_SEND; } else *wrobj = MACH_PORT_NULL; } return err; } } /* ---------------------------------------------------------------- */ /* Read data from an IO object. If offset if -1, read from the object maintained file pointer. If the object is not seekable, offset is ignored. The amount desired to be read is in AMT. */ kern_return_t trivfs_S_io_read(struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t replytype, vm_address_t *data, mach_msg_type_number_t *datalen, off_t offs, mach_msg_type_number_t amt) { if (!cred) return EOPNOTSUPP; else if (!(cred->po->openmodes & O_READ)) return EBADF; else return open_read((struct open *)cred->po->hook, data, datalen, amt, offs); } /* ---------------------------------------------------------------- */ /* Tell how much data can be read from the object without blocking for a "long time" (this should be the same meaning of "long time" used by the nonblocking flag. */ kern_return_t trivfs_S_io_readable (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t replytype, mach_msg_type_number_t *amount) { if (!cred) return EOPNOTSUPP; else if (!(cred->po->openmodes & O_READ)) return EINVAL; else { struct open *open = (struct open *)cred->po->hook; struct dev *dev = open->dev; vm_offset_t location = open_get_io_state(open)->location; *amount = dev->size - location; return 0; } } /* ---------------------------------------------------------------- */ /* Change current read/write offset */ kern_return_t trivfs_S_io_seek (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t replytype, off_t offs, int whence, off_t *new_offs) { if (!cred) return EOPNOTSUPP; else return open_seek ((struct open *)cred->po->hook, offs, whence, new_offs); } /* ---------------------------------------------------------------- */ /* SELECT_TYPE is the bitwise OR of SELECT_READ, SELECT_WRITE, and SELECT_URG. Block until one of the indicated types of i/o can be done "quickly", and return the types that are then available. ID_TAG is returned as passed; it is just for the convenience of the user in matching up reply messages with specific requests sent. */ kern_return_t trivfs_S_io_select (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t replytype, int *type, int *tag) { if (!cred) return EOPNOTSUPP; else if (((*type & SELECT_READ) && !(cred->po->openmodes & O_READ)) || ((*type & SELECT_WRITE) && !(cred->po->openmodes & O_WRITE))) return EBADF; else *type &= ~SELECT_URG; return 0; } /* ---------------------------------------------------------------- */ /* Write data to an IO object. If offset is -1, write at the object maintained file pointer. If the object is not seekable, offset is ignored. The amount successfully written is returned in amount. A given user should not have more than one outstanding io_write on an object at a time; servers implement congestion control by delaying responses to io_write. Servers may drop data (returning ENOBUFS) if they recevie more than one write when not prepared for it. */ kern_return_t trivfs_S_io_write (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t replytype, vm_address_t data, mach_msg_type_number_t datalen, off_t offs, mach_msg_type_number_t *amt) { if (!cred) return EOPNOTSUPP; else if (!(cred->po->openmodes & O_WRITE)) return EBADF; else return open_write((struct open *)cred->po->hook, data, datalen, amt, offs); } /* ---------------------------------------------------------------- */ /* Truncate file. */ kern_return_t trivfs_S_file_set_size (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t reply_type, off_t size) { if (!cred) return EOPNOTSUPP; else return 0; } /* ---------------------------------------------------------------- */ /* These four routines modify the O_APPEND, O_ASYNC, O_FSYNC, and O_NONBLOCK bits for the IO object. In addition, io_get_openmodes will tell you which of O_READ, O_WRITE, and O_EXEC the object can be used for. The O_ASYNC bit affects icky async I/O; good async I/O is done through io_async which is orthogonal to these calls. */ 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; } /* ---------------------------------------------------------------- */ /* Get/set the owner of the IO object. For terminals, this affects controlling terminal behavior (see term_become_ctty). For all objects this affects old-style async IO. Negative values represent pgrps. This has nothing to do with the owner of a file (as returned by io_stat, and as used for various permission checks by filesystems). An owner of 0 indicates that there is no owner. */ kern_return_t trivfs_S_io_get_owner (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t replytype, pid_t *owner) { if (!cred) return EOPNOTSUPP; else { struct open *open = (struct open *)cred->po->hook; *owner = open->dev->owner; return 0; } } kern_return_t trivfs_S_io_mod_owner (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t replytype, pid_t owner) { if (!cred) return EOPNOTSUPP; else { struct open *open = (struct open *)cred->po->hook; open->dev->owner = owner; return 0; } } /* ---------------------------------------------------------------- */ /* File syncing operations; these all do the same thing, sync the underlying device. */ kern_return_t trivfs_S_file_sync (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t reply_type, int wait) { if (cred) return dev_sync (((struct open *)cred->po->hook)->dev, wait); else return EOPNOTSUPP; } kern_return_t trivfs_S_file_syncfs (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t reply_type, int wait, int dochildren) { if (!cred) return dev_sync (((struct open *)cred->po->hook)->dev, wait); else return EOPNOTSUPP; } error_t trivfs_S_file_get_storage_info (struct trivfs_protid *cred, mach_port_t reply, mach_msg_type_name_t reply_type, mach_port_t **ports, mach_msg_type_number_t num_ports, mach_msg_type_name_t *ports_type, int **ints, mach_msg_type_number_t *num_ints, off_t **offsets, mach_msg_type_number_t *num_offsets, char **data, mach_msg_type_number_t *data_len) { error_t err = 0; if (!cred) err = EOPNOTSUPP; else { /* True when we've allocated memory for the corresponding vector. */ int al_ports = 0, al_ints = 0, al_offsets = 0, al_data = 0; #define ENSURE_MEM(v, vl, alp, num) \ if (!err && *vl < num) \ { \ err = vm_allocate (mach_task_self (), \ (vm_address_t *)v, num * sizeof (**v), 1); \ if (! err) \ { \ *vl = num; \ alp = 1; \ } \ } ENSURE_MEM (ports, num_ports, al_ports, 1); ENSURE_MEM (ints, num_ints, al_ints, 6); ENSURE_MEM (offsets, num_offsets, al_offsets, 2); ENSURE_MEM (data, data_len, al_data, 1); if (! err) { struct dev *dev = ((struct open *)cred->po->hook)->dev; (*ints)[0] = STORAGE_DEVICE; /* type */ (*ints)[1] = 0; /* flags */ (*ints)[2] = dev->dev_block_size; /* block_size */ (*ints)[3] = 2; /* num_runs */ (*ints)[4] = strlen (dev->name) + 1; /* name_len */ (*ints)[5] = 0; /* misc_len */ (*offsets)[0] = 0; (*offsets)[1] = dev->size / dev->dev_block_size; strcpy (*data, dev->name); if (cred->isroot) (*ports)[0] = dev->port; else (*ports)[0] = MACH_PORT_NULL; *ports_type = MACH_MSG_TYPE_COPY_SEND; } else /* Some memory allocation failed (not bloody likely). */ { #define DISCARD_MEM(v, vl, alp) \ if (alp) \ vm_deallocate (mach_task_self (), (vm_address_t)*v, *vl * sizeof (**v)); DISCARD_MEM (ports, num_ports, al_ports); DISCARD_MEM (ints, num_ints, al_ints); DISCARD_MEM (offsets, num_offsets, al_offsets); DISCARD_MEM (data, data_len, al_data); } } return err; }