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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS 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 3 of the
- License, or (at your option) any later version.
- Graphene Library OS 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 this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * db_device.c
- *
- * This file contains operands to handle streams with URIs that start with
- * "dev:".
- */
- #include "pal_defs.h"
- #include "pal_linux_defs.h"
- #include "pal.h"
- #include "pal_internal.h"
- #include "pal_linux.h"
- #include "pal_debug.h"
- #include "pal_error.h"
- #include "api.h"
- #include <linux/types.h>
- typedef __kernel_pid_t pid_t;
- #include <linux/stat.h>
- #include <asm/stat.h>
- #include <asm/fcntl.h>
- #define DEVICE_OPS(handle) \
- ({ int _type = (handle)->dev.dev_type; \
- (_type <= 0 || _type >= PAL_DEVICE_TYPE_BOUND) ? \
- NULL : pal_device_ops[_type]; \
- })
- enum {
- device_type_none = 0,
- device_type_term,
- PAL_DEVICE_TYPE_BOUND,
- };
- static struct handle_ops term_ops;
- static const struct handle_ops * pal_device_ops [PAL_DEVICE_TYPE_BOUND] = {
- NULL,
- &term_ops,
- };
- /* parse-device_uri scan the uri, parse the prefix of the uri and search
- for stream handler wich will open or access the device */
- static int parse_device_uri (const char ** uri, const char ** type,
- struct handle_ops ** ops)
- {
- struct handle_ops * dops = NULL;
- const char * p, * u = (*uri);
- for (p = u ; (*p) && (*p) != ',' && (*p) != '/' ; p++);
- if (strpartcmp_static(u, "tty"))
- dops = &term_ops;
- if (!dops)
- return -PAL_ERROR_NOTSUPPORT;
- *uri = (*p) ? p + 1 : p;
- if (type)
- *type = u;
- if (ops)
- *ops = dops;
- return 0;
- }
- static inline void
- dev_attrcopy (PAL_STREAM_ATTR * attr, struct stat * stat);
- static int64_t char_read (PAL_HANDLE handle, uint64_t offset, uint64_t count,
- void * buffer);
- static int64_t char_write (PAL_HANDLE handle, uint64_t offset, uint64_t count,
- const void * buffer);
- static int term_attrquery (const char * type, const char * uri,
- PAL_STREAM_ATTR * attr);
- static int term_attrquerybyhdl (PAL_HANDLE hdl,
- PAL_STREAM_ATTR * attr);
- /* Method to open standard terminal */
- static int open_standard_term (PAL_HANDLE * handle, const char * param,
- int access)
- {
- if (param)
- return -PAL_ERROR_NOTIMPLEMENTED;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(dev));
- SET_HANDLE_TYPE(hdl, dev);
- hdl->dev.dev_type = device_type_term;
- if (!(access & PAL_ACCESS_WRONLY)) {
- HANDLE_HDR(hdl)->flags |= RFD(0);
- hdl->dev.fd_in = 0;
- }
- if (access & (PAL_ACCESS_WRONLY|PAL_ACCESS_RDWR)) {
- HANDLE_HDR(hdl)->flags |= WFD(1);
- hdl->dev.fd_out = 1;
- }
- *handle = hdl;
- return 0;
- }
- /* 'open' operation for terminal stream */
- static int term_open (PAL_HANDLE *handle, const char * type, const char * uri,
- int access, int share, int create, int options)
- {
- const char * term = NULL;
- const char * param = NULL;
- const char * tmp = uri;
- while (*tmp) {
- if (!term && *tmp == '/')
- term = tmp + 1;
- if (*tmp == ',') {
- param = param + 1;
- break;
- }
- tmp++;
- }
- if (term)
- return -PAL_ERROR_NOTIMPLEMENTED;
- return open_standard_term(handle, param, access);
- }
- static int term_close (PAL_HANDLE handle)
- {
- return 0;
- }
- /* 'attrquery' operation for terminal stream */
- static int term_attrquery (const char * type, const char * uri,
- PAL_STREAM_ATTR * attr)
- {
- attr->handle_type = pal_type_dev;
- attr->readable = PAL_TRUE;
- attr->writeable = PAL_TRUE;
- attr->runnable = PAL_FALSE;
- attr->pending_size = 0;
- return 0;
- }
- /* 'attrquery' operation for terminal stream */
- static int term_attrquerybyhdl (PAL_HANDLE hdl,
- PAL_STREAM_ATTR * attr)
- {
- attr->handle_type = pal_type_dev;
- attr->readable = (hdl->dev.fd_in != PAL_IDX_POISON);
- attr->writeable = (hdl->dev.fd_out != PAL_IDX_POISON);
- attr->runnable = PAL_FALSE;
- attr->pending_size = 0;
- return 0;
- }
- static struct handle_ops term_ops = {
- .open = &term_open,
- .close = &term_close,
- .read = &char_read,
- .write = &char_write,
- .attrquery = &term_attrquery,
- .attrquerybyhdl = &term_attrquerybyhdl,
- };
- /* 'read' operation for character streams. */
- static int64_t char_read (PAL_HANDLE handle, uint64_t offset, uint64_t size,
- void * buffer)
- {
- int fd = handle->dev.fd_in;
- if (fd == PAL_IDX_POISON)
- return -PAL_ERROR_DENIED;
- if (size >= (1ULL << (sizeof(unsigned int) * 8)))
- return -PAL_ERROR_INVAL;
- return ocall_read(fd, buffer, size);
- }
- /* 'write' operation for character streams. */
- static int64_t char_write (PAL_HANDLE handle, uint64_t offset, uint64_t size,
- const void * buffer)
- {
- int fd = handle->dev.fd_out;
- if (fd == PAL_IDX_POISON)
- return -PAL_ERROR_DENIED;
- if (size >= (1ULL << (sizeof(unsigned int) * 8)))
- return -PAL_ERROR_INVAL;
- return ocall_write(fd, buffer, size);
- }
- /* 'open' operation for device streams */
- static int dev_open (PAL_HANDLE * handle, const char * type, const char * uri,
- int access, int share, int create, int options)
- {
- struct handle_ops * ops = NULL;
- const char * dev_type = NULL;
- int ret = 0;
- ret = parse_device_uri(&uri, &dev_type, &ops);
- if (ret < 0)
- return ret;
- if (!ops->open)
- return -PAL_ERROR_NOTSUPPORT;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(dev));
- SET_HANDLE_TYPE(hdl, dev);
- hdl->dev.fd_in = PAL_IDX_POISON;
- hdl->dev.fd_out = PAL_IDX_POISON;
- *handle = hdl;
- return ops->open(handle, dev_type, uri,
- access, share, create, options);
- }
- /* 'read' operation for device stream */
- static int64_t dev_read (PAL_HANDLE handle, uint64_t offset, uint64_t size,
- void * buffer)
- {
- const struct handle_ops * ops = DEVICE_OPS(handle);
- if (!ops || !ops->read)
- return -PAL_ERROR_NOTSUPPORT;
- return ops->read(handle, offset, size, buffer);
- }
- /* 'write' operation for device stream */
- static int64_t dev_write (PAL_HANDLE handle, uint64_t offset, uint64_t size,
- const void * buffer)
- {
- const struct handle_ops * ops = DEVICE_OPS(handle);
- if (!ops || !ops->write)
- return -PAL_ERROR_NOTSUPPORT;
- return ops->write(handle, offset, size, buffer);
- }
- /* 'close' operation for device streams */
- static int dev_close (PAL_HANDLE handle)
- {
- const struct handle_ops * ops = DEVICE_OPS(handle);
- if (ops && ops->close)
- return ops->close(handle);
- if (handle->dev.fd_in != PAL_IDX_POISON) {
- int fd = handle->dev.fd_in;
- ocall_close(fd);
- }
- if (handle->dev.fd_out != PAL_IDX_POISON) {
- int fd = handle->dev.fd_out;
- ocall_close(fd);
- }
- if (handle->file.realpath)
- free((void *) handle->file.realpath);
- return 0;
- }
- /* 'delete' operation for device streams */
- static int dev_delete (PAL_HANDLE handle, int access)
- {
- const struct handle_ops * ops = DEVICE_OPS(handle);
- if (!ops || !ops->delete)
- return -PAL_ERROR_DENIED;
- int ret = dev_close(handle);
- if (ret < 0)
- return ret;
- return ops->delete(handle, access);
- }
- /* 'flush' operation for device streams */
- static int dev_flush (PAL_HANDLE handle)
- {
- const struct handle_ops * ops = DEVICE_OPS(handle);
- if (ops && ops->flush)
- return ops->flush(handle);
- /* try to flush input stream */
- if (handle->dev.fd_in != PAL_IDX_POISON) {
- int fd = handle->dev.fd_in;
- ocall_fsync(fd);
- }
- /* if output stream exists and does not equal to input stream,
- flush output stream as well */
- if (handle->dev.fd_out != PAL_IDX_POISON &&
- handle->dev.fd_out != handle->dev.fd_in) {
- int fd = handle->dev.fd_out;
- ocall_fsync(fd);
- }
- return 0;
- }
- static inline void
- dev_attrcopy (PAL_STREAM_ATTR * attr, struct stat * stat)
- {
- attr->handle_type = pal_type_dev;
- /* readable, writable and runnable are decied by euidstataccess */
- attr->readable = stataccess(stat, ACCESS_R);
- attr->writeable = stataccess(stat, ACCESS_W);
- attr->runnable = stataccess(stat, ACCESS_X);
- attr->pending_size = stat->st_size;
- }
- /* 'attrquery' operation for device streams */
- static int dev_attrquery (const char * type, const char * uri,
- PAL_STREAM_ATTR * attr)
- {
- struct handle_ops * ops = NULL;
- const char * dev_type = NULL;
- int ret = 0;
- ret = parse_device_uri(&uri, &dev_type, &ops);
- if (ret < 0)
- return ret;
- if (!ops || !ops->attrquery)
- return -PAL_ERROR_NOTSUPPORT;
- return ops->attrquery(dev_type, uri, attr);
- }
- /* 'attrquerybyhdl' operation for device stream */
- static int dev_attrquerybyhdl (PAL_HANDLE handle,
- PAL_STREAM_ATTR * attr)
- {
- const struct handle_ops * ops = DEVICE_OPS(handle);
- if (ops && ops->attrquerybyhdl)
- return ops->attrquerybyhdl(handle, attr);
- struct stat stat_buf, * stat_in = NULL, * stat_out = NULL;
- int ret;
- attr->handle_type = pal_type_dev;
- if (handle->dev.fd_in != PAL_IDX_POISON) {
- ret = ocall_fstat(handle->dev.fd_in, &stat_buf);
- if (!ret)
- stat_in = &stat_buf;
- }
- if (handle->dev.fd_in != PAL_IDX_POISON) {
- ret = ocall_fstat(handle->dev.fd_in, &stat_buf);
- if (!ret)
- stat_out = &stat_buf;
- }
- attr->readable = (stat_in && stataccess(stat_in, ACCESS_R));
- attr->writeable = (stat_in && stataccess(stat_in, ACCESS_W));
- attr->runnable = (stat_out && stataccess(stat_out, ACCESS_X));
- attr->pending_size = stat_in ? stat_in->st_size :
- (stat_out ? stat_out->st_size : 0);
- return 0;
- }
- static const char * dev_getrealpath (PAL_HANDLE handle)
- {
- return handle->dev.realpath;
- }
- struct handle_ops dev_ops = {
- .getrealpath = &dev_getrealpath,
- .open = &dev_open,
- .read = &dev_read,
- .write = &dev_write,
- .close = &dev_close,
- .delete = &dev_delete,
- .flush = &dev_flush,
- .attrquery = &dev_attrquery,
- .attrquerybyhdl = &dev_attrquerybyhdl,
- };
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