e3b8d4bb58
This patch adds the implementation of the BSD socket system calls which have been introduced in an earlier patch. At the same time, it adds support for communication with socket drivers, using a new "socket device" (SDEV_) protocol. These two parts, implemented in socket.c and sdev.c respectively, form the upper and lower halves of the new BSD socket support in VFS. New mapping functionality for socket domains and drivers is added as well, implemented in smap.c. The rest of the changes mainly facilitate the separation of character and socket driver calls, and do not make any fundamental alterations. For example, while this patch changes VFS's select.c rather heavily, the new select logic for socket drivers is the exact same as for character drivers; the changes mainly separate the driver type specific parts from the generic select logic further than before. Change-Id: I2f13084dd3c8d3a68bfc69da0621120c8291f707
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
#ifndef __VFS_FILE_H__
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#define __VFS_FILE_H__
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/* This is the filp table. It is an intermediary between file descriptors and
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* inodes. A slot is free if filp_count == 0.
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*/
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EXTERN struct filp {
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mode_t filp_mode; /* RW bits, telling how file is opened */
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int filp_flags; /* flags from open and fcntl */
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int filp_count; /* how many file descriptors share this slot?*/
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struct vnode *filp_vno; /* vnode belonging to this file */
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off_t filp_pos; /* file position */
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mutex_t filp_lock; /* lock to gain exclusive access */
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struct fproc *filp_softlock; /* if not NULL; this filp didn't lock the
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* vnode. Another filp already holds a lock
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* for this thread */
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struct fproc *filp_ioctl_fp; /* if not NULL, this filp is locked by the
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* process for a currently ongoing IOCTL call
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*/
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/* the following fields are for select() and are owned by the generic
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* select() code (i.e., fd-type-specific select() code can't touch these).
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* These fields may be changed without holding the filp lock.
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*/
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int filp_selectors; /* select()ing processes blocking on this fd */
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int filp_select_ops; /* interested in these SEL_* operations */
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int filp_select_flags; /* Select flags for the filp */
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/* following are for fd-type-specific select() */
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int filp_pipe_select_ops; /* used for pipes */
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dev_t filp_select_dev; /* used for character and socket devices */
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} filp[NR_FILPS];
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#define FILP_CLOSED 0 /* filp_mode: associated device closed/gone */
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#define FSF_UPDATE 001 /* The driver should be informed about new
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* state.
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*/
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#define FSF_BUSY 002 /* Select operation sent to driver but no
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* reply yet.
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*/
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#define FSF_RD_BLOCK 010 /* Read request is blocking, the driver should
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* keep state.
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*/
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#define FSF_WR_BLOCK 020 /* Write request is blocking */
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#define FSF_ERR_BLOCK 040 /* Exception request is blocking */
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#define FSF_BLOCKED 070
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#endif
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