75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
#include "Log.h"
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#include "fs/VFS.h"
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#include "memory/MemoryManager.h"
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#include "sys/Syscall.h"
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#include "thread/Scheduler.h"
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#include <bits/modes.h>
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#include <bits/open-flags.h>
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// These flags are needed after open(), the rest only affect open().
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constexpr int FLAGS_TO_KEEP = O_RDWR | O_APPEND;
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Result<u64> sys_open(Registers*, SyscallArgs args)
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{
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auto path = TRY(MemoryManager::strdup_from_user(args[0]));
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int flags = (int)args[1];
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mode_t mode = (mode_t)args[2];
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Thread* current = Scheduler::current();
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kinfoln("open: trying to open file %s, flags %d", path.chars(), flags);
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SharedPtr<VFS::Inode> inode;
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// Caller did not pass either O_RDONLY, O_WRONLY or O_RDWR
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if ((flags & O_RDWR) == 0) { return err(EINVAL); }
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auto maybe_inode = VFS::resolve_path(path.chars());
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if (maybe_inode.has_error())
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{
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if (maybe_inode.error() == ENOENT && (flags & O_CREAT))
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{
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inode = TRY(VFS::create_file(path.chars()));
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inode->chmod(mode);
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}
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else
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return maybe_inode.release_error();
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}
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else if (flags & O_EXCL)
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return err(EEXIST);
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else
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{
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inode = maybe_inode.release_value();
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if ((flags & O_RDONLY) && (inode->mode() & S_IRUSR) == 0) return err(EACCES);
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if ((flags & O_WRONLY) && (inode->mode() & S_IWUSR) == 0) return err(EACCES);
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}
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if ((flags & O_WRONLY) && (flags & O_TRUNC)) inode->truncate(0);
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int fd = TRY(current->allocate_fd(0));
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current->fd_table[fd] = FileDescriptor { inode, 0, flags & FLAGS_TO_KEEP };
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kinfoln("open: allocated file descriptor %d for inode %zu", fd, inode->inode_number());
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return (u64)fd;
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}
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Result<u64> sys_close(Registers*, SyscallArgs args)
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{
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int fd = (int)args[0];
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if (fd < 0 || fd >= FD_MAX) return err(EBADF);
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Thread* current = Scheduler::current();
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Option<FileDescriptor>& descriptor = current->fd_table[fd];
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if (!descriptor.has_value()) return err(EBADF);
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kinfoln("close: closing file descriptor %d (was referencing inode %zu)", fd, descriptor->inode->inode_number());
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descriptor = {};
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return 0;
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}
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