mirror of
https://review.haiku-os.org/haiku
synced 2025-02-08 14:49:58 +01:00
66c03dc3a9
* Reworked the select support:
- The io_context additionally stores a table of lists of select_infos,
which enables it to deselect events of a pending select() when
closing a FD. This prevents a race condition potentially causing a
write to stale memory.
- The opaque selectsync* passed to FSs is now actually a select_info*.
This was necessary, since the FDs deselect() hook (unlike the
select() hook) doesn't take a "ref" argument and deselecting a
single info (e.g. caused by a premature close()) was not possible.
The select() hook's "ref" argument has become superfluous.
- It should now be relatively easy to implement a poll_on_steroids()
that can also wait for objects other than FDs (e.g. semaphores,
ports, threads etc.).
* Set/reset the signal mask in common_select(). This makes pselect()
work as required.
* Reorganized vfs_resize_fd_table().
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22391 a95241bf-73f2-0310-859d-f6bbb57e9c96
113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
|
|
* Copyright 2002-2006, Axel Dörfler, axeld@pinc-software.de.
|
|
* Distributed under the terms of the MIT License.
|
|
*/
|
|
#ifndef _FD_H
|
|
#define _FD_H
|
|
|
|
|
|
#include <vfs.h>
|
|
#include <team.h>
|
|
#include <thread.h>
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
struct file_descriptor;
|
|
struct selectsync;
|
|
struct select_sync;
|
|
|
|
struct fd_ops {
|
|
status_t (*fd_read)(struct file_descriptor *, off_t pos, void *buffer, size_t *length);
|
|
status_t (*fd_write)(struct file_descriptor *, off_t pos, const void *buffer, size_t *length);
|
|
off_t (*fd_seek)(struct file_descriptor *, off_t pos, int seekType);
|
|
status_t (*fd_ioctl)(struct file_descriptor *, ulong op, void *buffer, size_t length);
|
|
status_t (*fd_select)(struct file_descriptor *, uint8 event, uint32 ref,
|
|
struct selectsync *sync);
|
|
status_t (*fd_deselect)(struct file_descriptor *, uint8 event,
|
|
struct selectsync *sync);
|
|
status_t (*fd_read_dir)(struct file_descriptor *, struct dirent *buffer, size_t bufferSize, uint32 *_count);
|
|
status_t (*fd_rewind_dir)(struct file_descriptor *);
|
|
status_t (*fd_read_stat)(struct file_descriptor *, struct stat *);
|
|
status_t (*fd_write_stat)(struct file_descriptor *, const struct stat *, int statMask);
|
|
status_t (*fd_close)(struct file_descriptor *);
|
|
void (*fd_free)(struct file_descriptor *);
|
|
};
|
|
|
|
struct file_descriptor {
|
|
int32 type; /* descriptor type */
|
|
int32 ref_count;
|
|
int32 open_count;
|
|
struct fd_ops *ops;
|
|
union {
|
|
struct vnode *vnode;
|
|
struct fs_mount *mount;
|
|
} u;
|
|
void *cookie;
|
|
int32 open_mode;
|
|
off_t pos;
|
|
};
|
|
|
|
|
|
/* Types of file descriptors we can create */
|
|
|
|
enum fd_types {
|
|
FDTYPE_FILE = 1,
|
|
FDTYPE_ATTR,
|
|
FDTYPE_DIR,
|
|
FDTYPE_ATTR_DIR,
|
|
FDTYPE_INDEX,
|
|
FDTYPE_INDEX_DIR,
|
|
FDTYPE_QUERY,
|
|
FDTYPE_SOCKET
|
|
};
|
|
|
|
// additional open mode - kernel special
|
|
#define O_DISCONNECTED 0x80000000
|
|
|
|
/* Prototypes */
|
|
|
|
extern struct file_descriptor *alloc_fd(void);
|
|
extern int new_fd_etc(struct io_context *, struct file_descriptor *, int firstIndex);
|
|
extern int new_fd(struct io_context *, struct file_descriptor *);
|
|
extern struct file_descriptor *get_fd(struct io_context *, int);
|
|
extern void close_fd(struct file_descriptor *descriptor);
|
|
extern void put_fd(struct file_descriptor *descriptor);
|
|
extern void disconnect_fd(struct file_descriptor *descriptor);
|
|
extern void inc_fd_ref_count(struct file_descriptor *descriptor);
|
|
extern status_t select_fd(int fd, struct select_sync *sync, uint32 ref,
|
|
bool kernel);
|
|
extern status_t deselect_fd(int fd, struct select_sync *sync, uint32 ref,
|
|
bool kernel);
|
|
extern bool fd_is_valid(int fd, bool kernel);
|
|
extern struct vnode *fd_vnode(struct file_descriptor *descriptor);
|
|
|
|
extern bool fd_close_on_exec(struct io_context *context, int fd);
|
|
extern void fd_set_close_on_exec(struct io_context *context, int fd, bool closeFD);
|
|
|
|
static struct io_context *get_current_io_context(bool kernel);
|
|
|
|
extern status_t user_fd_kernel_ioctl(int fd, ulong op, void *buffer, size_t length);
|
|
|
|
/* The prototypes of the (sys|user)_ functions are currently defined in vfs.h */
|
|
|
|
|
|
/* Inlines */
|
|
|
|
static inline struct io_context *
|
|
get_current_io_context(bool kernel)
|
|
{
|
|
if (kernel)
|
|
return (struct io_context *)team_get_kernel_team()->io_context;
|
|
|
|
return (struct io_context *)thread_get_current_thread()->team->io_context;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _FD_H */
|