321 lines
8.4 KiB
C++
321 lines
8.4 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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filesystem.cpp
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Allows access to stored sequences of bytes in an orderly fashion.
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*******************************************************************************/
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#include <sortix/kernel/platform.h>
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#include <sortix/kernel/string.h>
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#include <errno.h>
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#include <string.h>
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#include "syscall.h"
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#include "process.h"
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#include "filesystem.h"
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#include "directory.h"
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#include "mount.h"
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#include <sortix/stat.h>
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#include <sortix/fcntl.h>
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#include <sortix/unistd.h>
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namespace Sortix
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{
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namespace FileSystem
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{
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Device* Open(const char* path, int flags, mode_t mode)
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{
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Process* process = CurrentProcess();
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const char* wd = process->workingdir;
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char* abs = Directory::MakeAbsolute(wd, path);
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if ( !abs ) { errno = ENOMEM; return NULL; }
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size_t pathoffset = 0;
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DevFileSystem* fs = Mount::WhichFileSystem(abs, &pathoffset);
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if ( !fs ) { delete[] abs; return NULL; }
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Device* result = fs->Open(abs + pathoffset, flags, mode);
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delete[] abs;
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return result;
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}
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bool Unlink(const char* path)
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{
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Process* process = CurrentProcess();
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const char* wd = process->workingdir;
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char* abs = Directory::MakeAbsolute(wd, path);
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if ( !abs ) { errno = ENOMEM; return false; }
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size_t pathoffset = 0;
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DevFileSystem* fs = Mount::WhichFileSystem(abs, &pathoffset);
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if ( !fs ) { delete[] abs; return false; }
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bool result = fs->Unlink(abs + pathoffset);
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delete[] abs;
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return result;
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}
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int SysOpen(const char* path, int flags, mode_t mode)
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{
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char* pathcopy = String::Clone(path);
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if ( !pathcopy )
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return -1;
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Process* process = CurrentProcess();
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Device* dev = Open(path, flags, mode);
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if ( !dev ) { delete[] pathcopy; return -1; }
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int fd = process->descriptors.Allocate(dev, pathcopy);
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if ( fd < 0 ) { dev->Unref(); }
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int fdflags = 0;
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if ( flags & O_CLOEXEC ) { fdflags |= FD_CLOEXEC; }
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if ( flags & O_CLOFORK ) { fdflags |= FD_CLOFORK; }
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process->descriptors.SetFlags(fd, fdflags);
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return fd;
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}
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int SysOpenAt(int dirfd, const char* pathname, int flags, mode_t mode)
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{
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if ( pathname[0] == '/' )
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return SysOpen(pathname, flags, mode);
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Process* process = CurrentProcess();
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Device* dir = process->descriptors.Get(dirfd);
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if ( !dir ) { errno = EBADF; return -1; }
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const char* path = process->descriptors.GetPath(dirfd);
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char* fullpath = String::Combine(3, path, "/", pathname);
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if ( !fullpath )
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return -1;
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int ret = SysOpen(fullpath, flags, mode);
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delete[] fullpath;
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return ret;
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}
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int SysAccess(const char* pathname, int mode)
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{
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int oflags = 0;
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bool exec = mode & X_OK;
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bool read = mode & R_OK;
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bool write = mode & W_OK;
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if ( mode == F_OK ) { oflags = O_RDONLY; }
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if ( exec && !read && !write ) { oflags = O_EXEC; }
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if ( exec && read && !write ) { oflags = O_EXEC; }
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if ( exec && !read && write ) { oflags = O_EXEC; }
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if ( exec && read && write ) { oflags = O_EXEC; }
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if ( !exec && read && write ) { oflags = O_RDWR; }
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if ( !exec && !read && write ) { oflags = O_WRONLY; }
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if ( !exec && read && !write ) { oflags = O_RDONLY; }
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Device* dev = Open(pathname, oflags, 0);
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if ( !dev ) { return -1; }
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dev->Unref();
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return 0;
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}
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int SysUnlink(const char* path)
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{
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return Unlink(path) ? 0 : -1;
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}
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int SysMkDir(const char* pathname, mode_t mode)
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{
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// TODO: Add the proper filesystem support!
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errno = ENOSYS;
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return -1;
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}
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int SysRmDir(const char* pathname)
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{
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// TODO: Add the proper filesystem support!
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errno = ENOSYS;
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return -1;
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}
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int SysTruncate(const char* pathname, off_t length)
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{
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// TODO: Add the proper filesystem support!
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errno = ENOSYS;
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return -1;
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}
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int SysFTruncate(const char* pathname, off_t length)
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{
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// TODO: Add the proper filesystem support!
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errno = ENOSYS;
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return -1;
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}
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void HackStat(Device* dev, struct stat* st)
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{
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memset(st, 0, sizeof(*st));
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st->st_mode = 0777;
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st->st_nlink = 1;
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if ( dev->IsType(Device::BUFFER) )
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{
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st->st_mode |= S_IFREG;
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DevBuffer* buffer = (DevBuffer*) dev;
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st->st_size = buffer->Size();
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st->st_blksize = 1;
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st->st_blocks = st->st_size;
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}
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if ( dev->IsType(Device::DIRECTORY) )
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{
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st->st_mode |= S_IFDIR;
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st->st_nlink = 2;
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}
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}
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int SysStat(const char* pathname, struct stat* st)
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{
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Device* dev = Open(pathname, O_RDONLY, 0);
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if ( !dev && errno == EISDIR )
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{
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dev = Open(pathname, O_SEARCH, 0);
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}
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if ( !dev ) { return -1; }
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HackStat(dev, st);
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dev->Unref();
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return 0;
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}
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int SysFStat(int fd, struct stat* st)
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{
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Process* process = CurrentProcess();
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DescriptorTable* descs = &(process->descriptors);
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Device* dev = descs->Get(fd);
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if ( !dev ) { errno = EBADF; return -1; }
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HackStat(dev, st);
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return 0;
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}
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int SysFCntl(int fd, int cmd, unsigned long arg)
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{
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Process* process = CurrentProcess();
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DescriptorTable* descs = &(process->descriptors);
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Device* dev = descs->Get(fd);
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if ( !dev ) { errno = EBADF; return -1; }
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switch ( cmd )
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{
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case F_SETFD: descs->SetFlags(fd, (int) arg); return 0;
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case F_GETFD: return descs->GetFlags(fd);
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case F_SETFL: errno = ENOSYS; return -1;
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case F_GETFL:
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if ( dev->IsType(Device::DIRECTORY) ) { return O_SEARCH; }
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if ( !dev->IsType(Device::STREAM) )
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{
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errno = ENOSYS;
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return -1;
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}
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DevStream* stream = (DevStream*) stream;
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bool write = stream->IsWritable();
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bool read = stream->IsReadable();
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if ( write && read ) { return O_RDWR; }
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if ( write && !read ) { return O_WRONLY; }
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if ( !write && read ) { return O_RDONLY; }
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return O_EXEC;
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break;
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}
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errno = EINVAL;
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return 1;
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}
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void Init()
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{
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Syscall::Register(SYSCALL_OPEN, (void*) SysOpen);
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Syscall::Register(SYSCALL_OPENAT, (void*) SysOpenAt);
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Syscall::Register(SYSCALL_UNLINK, (void*) SysUnlink);
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Syscall::Register(SYSCALL_MKDIR, (void*) SysMkDir);
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Syscall::Register(SYSCALL_RMDIR, (void*) SysRmDir);
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Syscall::Register(SYSCALL_TRUNCATE, (void*) SysTruncate);
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Syscall::Register(SYSCALL_FTRUNCATE, (void*) SysFTruncate);
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Syscall::Register(SYSCALL_STAT, (void*) SysStat);
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Syscall::Register(SYSCALL_FSTAT, (void*) SysFStat);
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Syscall::Register(SYSCALL_FCNTL, (void*) SysFCntl);
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Syscall::Register(SYSCALL_ACCESS, (void*) SysAccess);
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}
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}
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DevFileWrapper::DevFileWrapper(DevBuffer* buffer, int flags)
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{
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this->buffer = buffer;
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this->flags = flags;
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this->offset = 0;
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this->buffer->Refer();
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if ( flags & O_TRUNC ) { buffer->Resize(0); }
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}
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DevFileWrapper::~DevFileWrapper()
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{
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buffer->Unref();
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}
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size_t DevFileWrapper::BlockSize()
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{
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return buffer->BlockSize();
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}
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uintmax_t DevFileWrapper::Size()
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{
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return buffer->Size();
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}
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uintmax_t DevFileWrapper::Position()
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{
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return offset;
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}
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bool DevFileWrapper::Seek(uintmax_t position)
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{
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if ( !buffer->Seek(position) ) { return false; }
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offset = position;
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return true;
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}
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bool DevFileWrapper::Resize(uintmax_t size)
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{
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return buffer->Resize(size);
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}
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ssize_t DevFileWrapper::Read(uint8_t* dest, size_t count)
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{
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// TODO: Enforce read permission!
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if ( !buffer->Seek(offset) ) { return -1; }
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ssize_t result = buffer->Read(dest, count);
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if ( result < 0 ) { return result; }
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offset += result;
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return result;
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}
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ssize_t DevFileWrapper::Write(const uint8_t* src, size_t count)
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{
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// TODO: Enforce write permission!
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if ( !buffer->Seek(offset) ) { return -1; }
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ssize_t result = buffer->Write(src, count);
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if ( result < 0 ) { return result; }
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offset += result;
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return result;
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}
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bool DevFileWrapper::IsReadable()
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{
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// TODO: Enforce read permission!
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return true;
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}
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bool DevFileWrapper::IsWritable()
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{
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// TODO: Enforce write permission!
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return true;
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}
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}
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