225 lines
8.3 KiB
C
225 lines
8.3 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)filedesc.h 8.1 (Berkeley) 6/2/93
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* $FreeBSD$
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*/
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#ifndef _SYS_FILEDESC_H_
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#define _SYS_FILEDESC_H_
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#include <sys/caprights.h>
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#include <sys/queue.h>
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#include <sys/event.h>
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#include <sys/lock.h>
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#include <sys/priority.h>
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#include <sys/seq.h>
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#include <sys/sx.h>
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#include <machine/_limits.h>
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struct filecaps {
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cap_rights_t fc_rights; /* per-descriptor capability rights */
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u_long *fc_ioctls; /* per-descriptor allowed ioctls */
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int16_t fc_nioctls; /* fc_ioctls array size */
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uint32_t fc_fcntls; /* per-descriptor allowed fcntls */
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};
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struct filedescent {
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struct file *fde_file; /* file structure for open file */
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struct filecaps fde_caps; /* per-descriptor rights */
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uint8_t fde_flags; /* per-process open file flags */
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seq_t fde_seq; /* keep file and caps in sync */
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};
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#define fde_rights fde_caps.fc_rights
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#define fde_fcntls fde_caps.fc_fcntls
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#define fde_ioctls fde_caps.fc_ioctls
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#define fde_nioctls fde_caps.fc_nioctls
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#define fde_change_size (offsetof(struct filedescent, fde_seq))
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struct fdescenttbl {
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int fdt_nfiles; /* number of open files allocated */
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struct filedescent fdt_ofiles[0]; /* open files */
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};
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#define fd_seq(fdt, fd) (&(fdt)->fdt_ofiles[(fd)].fde_seq)
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/*
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* This structure is used for the management of descriptors. It may be
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* shared by multiple processes.
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*/
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#define NDSLOTTYPE u_long
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struct filedesc {
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struct fdescenttbl *fd_files; /* open files table */
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struct vnode *fd_cdir; /* current directory */
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struct vnode *fd_rdir; /* root directory */
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struct vnode *fd_jdir; /* jail root directory */
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NDSLOTTYPE *fd_map; /* bitmap of free fds */
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int fd_lastfile; /* high-water mark of fd_ofiles */
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int fd_freefile; /* approx. next free file */
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u_short fd_cmask; /* mask for file creation */
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int fd_refcnt; /* thread reference count */
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int fd_holdcnt; /* hold count on structure + mutex */
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struct sx fd_sx; /* protects members of this struct */
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struct kqlist fd_kqlist; /* list of kqueues on this filedesc */
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int fd_holdleaderscount; /* block fdfree() for shared close() */
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int fd_holdleaderswakeup; /* fdfree() needs wakeup */
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};
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/*
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* Structure to keep track of (process leader, struct fildedesc) tuples.
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* Each process has a pointer to such a structure when detailed tracking
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* is needed, e.g., when rfork(RFPROC | RFMEM) causes a file descriptor
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* table to be shared by processes having different "p_leader" pointers
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* and thus distinct POSIX style locks.
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*
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* fdl_refcount and fdl_holdcount are protected by struct filedesc mtx.
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*/
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struct filedesc_to_leader {
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int fdl_refcount; /* references from struct proc */
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int fdl_holdcount; /* temporary hold during closef */
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int fdl_wakeup; /* fdfree() waits on closef() */
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struct proc *fdl_leader; /* owner of POSIX locks */
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/* Circular list: */
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struct filedesc_to_leader *fdl_prev;
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struct filedesc_to_leader *fdl_next;
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};
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#define fd_nfiles fd_files->fdt_nfiles
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#define fd_ofiles fd_files->fdt_ofiles
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/*
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* Per-process open flags.
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*/
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#define UF_EXCLOSE 0x01 /* auto-close on exec */
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#ifdef _KERNEL
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/* Lock a file descriptor table. */
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#define FILEDESC_LOCK_INIT(fdp) sx_init(&(fdp)->fd_sx, "filedesc structure")
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#define FILEDESC_LOCK_DESTROY(fdp) sx_destroy(&(fdp)->fd_sx)
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#define FILEDESC_LOCK(fdp) (&(fdp)->fd_sx)
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#define FILEDESC_XLOCK(fdp) sx_xlock(&(fdp)->fd_sx)
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#define FILEDESC_XUNLOCK(fdp) sx_xunlock(&(fdp)->fd_sx)
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#define FILEDESC_SLOCK(fdp) sx_slock(&(fdp)->fd_sx)
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#define FILEDESC_SUNLOCK(fdp) sx_sunlock(&(fdp)->fd_sx)
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#define FILEDESC_LOCK_ASSERT(fdp) sx_assert(&(fdp)->fd_sx, SX_LOCKED | \
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SX_NOTRECURSED)
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#define FILEDESC_XLOCK_ASSERT(fdp) sx_assert(&(fdp)->fd_sx, SX_XLOCKED | \
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SX_NOTRECURSED)
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#define FILEDESC_UNLOCK_ASSERT(fdp) sx_assert(&(fdp)->fd_sx, SX_UNLOCKED)
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/* Operation types for kern_dup(). */
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enum {
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FDDUP_NORMAL, /* dup() behavior. */
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FDDUP_FCNTL, /* fcntl()-style errors. */
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FDDUP_FIXED, /* Force fixed allocation. */
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FDDUP_MUSTREPLACE, /* Target must exist. */
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FDDUP_LASTMODE,
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};
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/* Flags for kern_dup(). */
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#define FDDUP_FLAG_CLOEXEC 0x1 /* Atomically set UF_EXCLOSE. */
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/* For backward compatibility. */
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#define falloc(td, resultfp, resultfd, flags) \
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falloc_caps(td, resultfp, resultfd, flags, NULL)
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struct thread;
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void filecaps_init(struct filecaps *fcaps);
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int filecaps_copy(const struct filecaps *src, struct filecaps *dst,
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bool locked);
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void filecaps_move(struct filecaps *src, struct filecaps *dst);
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void filecaps_free(struct filecaps *fcaps);
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int closef(struct file *fp, struct thread *td);
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int dupfdopen(struct thread *td, struct filedesc *fdp, int dfd, int mode,
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int openerror, int *indxp);
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int falloc_caps(struct thread *td, struct file **resultfp, int *resultfd,
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int flags, struct filecaps *fcaps);
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int falloc_noinstall(struct thread *td, struct file **resultfp);
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void _finstall(struct filedesc *fdp, struct file *fp, int fd, int flags,
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struct filecaps *fcaps);
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int finstall(struct thread *td, struct file *fp, int *resultfd, int flags,
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struct filecaps *fcaps);
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int fdalloc(struct thread *td, int minfd, int *result);
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int fdallocn(struct thread *td, int minfd, int *fds, int n);
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int fdcheckstd(struct thread *td);
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void fdclose(struct thread *td, struct file *fp, int idx);
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void fdcloseexec(struct thread *td);
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void fdsetugidsafety(struct thread *td);
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struct filedesc *fdcopy(struct filedesc *fdp);
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int fdcopy_remapped(struct filedesc *fdp, const int *fds, size_t nfds,
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struct filedesc **newfdp);
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void fdinstall_remapped(struct thread *td, struct filedesc *fdp);
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void fdunshare(struct thread *td);
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void fdescfree(struct thread *td);
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void fdescfree_remapped(struct filedesc *fdp);
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struct filedesc *fdinit(struct filedesc *fdp, bool prepfiles);
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struct filedesc *fdshare(struct filedesc *fdp);
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struct filedesc_to_leader *
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filedesc_to_leader_alloc(struct filedesc_to_leader *old,
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struct filedesc *fdp, struct proc *leader);
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int getvnode(struct thread *td, int fd, cap_rights_t *rightsp,
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struct file **fpp);
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void mountcheckdirs(struct vnode *olddp, struct vnode *newdp);
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/* Return a referenced file from an unlocked descriptor. */
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int fget_unlocked(struct filedesc *fdp, int fd, cap_rights_t *needrightsp,
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struct file **fpp, seq_t *seqp);
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/* Requires a FILEDESC_{S,X}LOCK held and returns without a ref. */
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static __inline struct file *
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fget_locked(struct filedesc *fdp, int fd)
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{
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FILEDESC_LOCK_ASSERT(fdp);
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if (fd < 0 || fd > fdp->fd_lastfile)
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return (NULL);
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return (fdp->fd_ofiles[fd].fde_file);
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}
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static __inline bool
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fd_modified(struct filedesc *fdp, int fd, seq_t seq)
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{
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return (!seq_consistent(fd_seq(fdp->fd_files, fd), seq));
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}
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/* cdir/rdir/jdir manipulation functions. */
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void pwd_chdir(struct thread *td, struct vnode *vp);
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int pwd_chroot(struct thread *td, struct vnode *vp);
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void pwd_ensure_dirs(void);
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#endif /* _KERNEL */
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#endif /* !_SYS_FILEDESC_H_ */
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