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filedesc.h (110906) filedesc.h (115702)
1/*
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93
1/*
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93
34 * $FreeBSD: head/sys/sys/filedesc.h 110906 2003-02-15 05:52:56Z alfred $
34 * $FreeBSD: head/sys/sys/filedesc.h 115702 2003-06-02 16:05:32Z tegge $
35 */
36
37#ifndef _SYS_FILEDESC_H_
38#define _SYS_FILEDESC_H_
39
40#include <sys/_lock.h>
41#include <sys/_mutex.h>
42#include <sys/queue.h>

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70 u_short fd_cmask; /* mask for file creation */
71 u_short fd_refcnt; /* reference count */
72
73 int fd_knlistsize; /* size of knlist */
74 struct klist *fd_knlist; /* list of attached knotes */
75 u_long fd_knhashmask; /* size of knhash */
76 struct klist *fd_knhash; /* hash table for attached knotes */
77 struct mtx fd_mtx; /* mtx to protect the members of struct filedesc */
35 */
36
37#ifndef _SYS_FILEDESC_H_
38#define _SYS_FILEDESC_H_
39
40#include <sys/_lock.h>
41#include <sys/_mutex.h>
42#include <sys/queue.h>

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70 u_short fd_cmask; /* mask for file creation */
71 u_short fd_refcnt; /* reference count */
72
73 int fd_knlistsize; /* size of knlist */
74 struct klist *fd_knlist; /* list of attached knotes */
75 u_long fd_knhashmask; /* size of knhash */
76 struct klist *fd_knhash; /* hash table for attached knotes */
77 struct mtx fd_mtx; /* mtx to protect the members of struct filedesc */
78 int fd_holdleaderscount; /* block fdfree() for shared close() */
79 int fd_holdleaderswakeup; /* fdfree() needs wakeup */
78};
79
80/*
81 * Basic allocation of descriptors:
82 * one of the above, plus arrays for NDFILE descriptors.
83 */
84struct filedesc0 {
85 struct filedesc fd_fd;
86 /*
87 * These arrays are used when the number of open files is
88 * <= NDFILE, and are then pointed to by the pointers above.
89 */
90 struct file *fd_dfiles[NDFILE];
91 char fd_dfileflags[NDFILE];
92};
93
80};
81
82/*
83 * Basic allocation of descriptors:
84 * one of the above, plus arrays for NDFILE descriptors.
85 */
86struct filedesc0 {
87 struct filedesc fd_fd;
88 /*
89 * These arrays are used when the number of open files is
90 * <= NDFILE, and are then pointed to by the pointers above.
91 */
92 struct file *fd_dfiles[NDFILE];
93 char fd_dfileflags[NDFILE];
94};
95
96
97
94/*
98/*
99 * Structure to keep track of (process leader, struct fildedesc) tuples.
100 * Each process has a pointer to such a structure when detailed tracking
101 * is needed. e.g. when rfork(RFPROC | RFMEM) causes a file descriptor
102 * table to be shared by processes having different "p_leader" pointers
103 * and thus distinct POSIX style locks.
104 *
105 * fdl_refcount and fdl_holdcount are protected by struct filedesc mtx.
106 */
107struct filedesc_to_leader {
108 int fdl_refcount; /* references from struct proc */
109 int fdl_holdcount; /* temporary hold during closef */
110 int fdl_wakeup; /* fdfree() waits on closef() */
111 struct proc *fdl_leader; /* owner of POSIX locks */
112 /* Circular list */
113 struct filedesc_to_leader *fdl_prev;
114 struct filedesc_to_leader *fdl_next;
115};
116
117/*
95 * Per-process open flags.
96 */
97#define UF_EXCLOSE 0x01 /* auto-close on exec */
98#if 0
99#define UF_MAPPED 0x02 /* mapped from device */
100#endif
101
102/*

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126void fdfree(struct thread *td);
127struct filedesc *fdinit(struct filedesc *fdp);
128struct filedesc *fdshare(struct filedesc *fdp);
129void ffree(struct file *fp);
130static __inline struct file * fget_locked(struct filedesc *fdp, int fd);
131int getvnode(struct filedesc *fdp, int fd, struct file **fpp);
132void setugidsafety(struct thread *td);
133
118 * Per-process open flags.
119 */
120#define UF_EXCLOSE 0x01 /* auto-close on exec */
121#if 0
122#define UF_MAPPED 0x02 /* mapped from device */
123#endif
124
125/*

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149void fdfree(struct thread *td);
150struct filedesc *fdinit(struct filedesc *fdp);
151struct filedesc *fdshare(struct filedesc *fdp);
152void ffree(struct file *fp);
153static __inline struct file * fget_locked(struct filedesc *fdp, int fd);
154int getvnode(struct filedesc *fdp, int fd, struct file **fpp);
155void setugidsafety(struct thread *td);
156
157struct filedesc_to_leader *
158filedesc_to_leader_alloc(struct filedesc_to_leader *old,
159 struct filedesc *fdp,
160 struct proc *leader);
161
162
134static __inline struct file *
135fget_locked(struct filedesc *fdp, int fd)
136{
137
138 /* u_int cast checks for negative descriptors. */
139 return ((u_int)fd >= (u_int)fdp->fd_nfiles ? NULL : fdp->fd_ofiles[fd]);
140}
141
142extern struct mtx fdesc_mtx;
143
144#endif /* _KERNEL */
145
146#endif /* !_SYS_FILEDESC_H_ */
163static __inline struct file *
164fget_locked(struct filedesc *fdp, int fd)
165{
166
167 /* u_int cast checks for negative descriptors. */
168 return ((u_int)fd >= (u_int)fdp->fd_nfiles ? NULL : fdp->fd_ofiles[fd]);
169}
170
171extern struct mtx fdesc_mtx;
172
173#endif /* _KERNEL */
174
175#endif /* !_SYS_FILEDESC_H_ */