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* fd.c -> fd.cpp

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* 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
This commit is contained in:
Ingo Weinhold
2007-10-01 01:37:28 +00:00
parent f5ede4ec02
commit 66c03dc3a9
7 changed files with 394 additions and 246 deletions
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headers/private/kernel/fs/fd.h
+8 -5
View File
@@ -16,6 +16,7 @@ extern "C" {
#endif
struct file_descriptor;
struct selectsync;
struct select_sync;
struct fd_ops {
@@ -23,8 +24,10 @@ struct fd_ops {
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 select_sync *sync);
status_t (*fd_deselect)(struct file_descriptor *, uint8 event, struct select_sync *sync);
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 *);
@@ -74,9 +77,9 @@ 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, uint8 event, uint32 ref,
struct select_sync *sync, bool kernel);
extern status_t deselect_fd(int fd, uint8 event, struct select_sync *sync,
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);