2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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33 * @(#)filedesc.h 8.1 (Berkeley) 6/2/93
37 #ifndef _SYS_FILEDESC_H_
38 #define _SYS_FILEDESC_H_
40 #include <sys/queue.h>
43 * This structure is used for the management of descriptors. It may be
44 * shared by multiple processes.
46 * A process is initially started out with NDFILE descriptors stored within
47 * this structure, selected to be enough for typical applications based on
48 * the historical limit of 20 open files (and the usage of descriptors by
49 * shells). If these descriptors are exhausted, a larger descriptor table
50 * may be allocated, up to a process' resource limit; the internal arrays
51 * are then unused. The initial expansion is set to NDEXTENT; each time
52 * it runs out, it is doubled until the resource limit is reached. NDEXTENT
53 * should be selected to be the biggest multiple of OFILESIZE (see below)
54 * that will fit in a power-of-two sized piece of memory.
57 #define NDEXTENT 50 /* 250 bytes in 256-byte alloc. */
60 struct file **fd_ofiles; /* file structures for open files */
61 char *fd_ofileflags; /* per-process open file flags */
62 struct vnode *fd_cdir; /* current directory */
63 struct vnode *fd_rdir; /* root directory */
64 struct vnode *fd_jdir; /* jail root directory */
65 int fd_nfiles; /* number of open files allocated */
66 u_short fd_lastfile; /* high-water mark of fd_ofiles */
67 u_short fd_freefile; /* approx. next free file */
68 u_short fd_cmask; /* mask for file creation */
69 u_short fd_refcnt; /* reference count */
71 int fd_knlistsize; /* size of knlist */
72 struct klist *fd_knlist; /* list of attached knotes */
73 u_long fd_knhashmask; /* size of knhash */
74 struct klist *fd_knhash; /* hash table for attached knotes */
78 * Basic allocation of descriptors:
79 * one of the above, plus arrays for NDFILE descriptors.
82 struct filedesc fd_fd;
84 * These arrays are used when the number of open files is
85 * <= NDFILE, and are then pointed to by the pointers above.
87 struct file *fd_dfiles[NDFILE];
88 char fd_dfileflags[NDFILE];
92 * Per-process open flags.
94 #define UF_EXCLOSE 0x01 /* auto-close on exec */
96 #define UF_MAPPED 0x02 /* mapped from device */
100 * Storage required per open file descriptor.
102 #define OFILESIZE (sizeof(struct file *) + sizeof(char))
105 * This structure holds the information needed to send a SIGIO or
106 * a SIGURG signal to a process or process group when new data arrives
107 * on a device or socket. The structure is placed on an SLIST belonging
108 * to the proc or pgrp so that the entire list may be revoked when the
109 * process exits or the process group disappears.
113 struct proc *siu_proc; /* process to receive SIGIO/SIGURG */
114 struct pgrp *siu_pgrp; /* process group to receive ... */
116 SLIST_ENTRY(sigio) sio_pgsigio; /* sigio's for process or group */
117 struct sigio **sio_myref; /* location of the pointer that holds
118 * the reference to this structure */
119 struct ucred *sio_ucred; /* current credentials */
120 pid_t sio_pgid; /* pgid for signals */
122 #define sio_proc sio_u.siu_proc
123 #define sio_pgrp sio_u.siu_pgrp
125 SLIST_HEAD(sigiolst, sigio);
128 int closef __P((struct file *fp, struct proc *p));
129 int dupfdopen __P((struct proc *p, struct filedesc *fdp, int indx, int dfd, int mode,
131 int falloc __P((struct proc *p, struct file **resultfp, int *resultfd));
132 int fdalloc __P((struct proc *p, int want, int *result));
133 int fdavail __P((struct proc *p, int n));
134 void fdcloseexec __P((struct proc *p));
135 struct filedesc *fdcopy __P((struct proc *p));
136 void fdfree __P((struct proc *p));
137 struct filedesc *fdinit __P((struct proc *p));
138 struct filedesc *fdshare __P((struct proc *p));
139 void ffree __P((struct file *fp));
140 pid_t fgetown __P((struct sigio *sigio));
141 int fsetown __P((pid_t pgid, struct sigio **sigiop));
142 void funsetown __P((struct sigio *sigio));
143 void funsetownlst __P((struct sigiolst *sigiolst));
144 struct file *holdfp __P((struct filedesc *fdp, int fd, int flag));
145 int getvnode __P((struct filedesc *fdp, int fd, struct file **fpp));
146 void setugidsafety __P((struct proc *p));
150 #endif /* !_SYS_FILEDESC_H_ */