VNFILEOPS(9) BSD Kernel Developer's Manual VNFILEOPS(9)
NAME
vnfileops, vn_closefile, vn_fcntl, vn_ioctl, vn_read, vn_poll, vn_statfile, vn_write -- vnode file descriptor operations
SYNOPSIS
#include <sys/param.h>
#include <sys/file.h>
#include <sys/vnode.h>
int
vn_closefile(file_t *fp);
int
vn_fcntl(file_t *fp, u_int com, void *data);
int
vn_ioctl(file_t *fp, u_long com, void *data);
int
vn_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, int flags);
int
vn_poll(file_t *fp, int events);
int
vn_statfile(file_t *fp, struct stat *sb);
int
vn_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, int flags);
DESCRIPTION
The functions described in this page are the vnode-specific file descriptor operations. They should only be accessed through the opaque
function pointers in the file entries (see file(9)). They are described here only for completeness.
FUNCTIONS
vn_closefile(fp, l)
Common code for a file table vnode close operation. The file is described by fp and l is the calling lwp. vn_closefile() simply
calls vn_close(9) with the appropriate arguments.
vn_fcntl(fp, com, data, l)
Common code for a file table vnode fcntl(2) operation. The file is specified by fp. The argument l is the calling lwp. vn_fcntl()
simply locks the vnode and invokes the vnode operation VOP_FCNTL(9) with the command com and buffer data. The vnode is unlocked on
return. If the operation is successful zero is returned, otherwise an appropriate error is returned.
vn_ioctl(fp, com, data, l)
Common code for a file table vnode ioctl operation. The file is specified by fp. The argument l is the calling lwp vn_ioctl() sim-
ply locks the vnode and invokes the vnode operation VOP_IOCTL(9) with the command com and buffer data. The vnode is unlocked on
return. If the operation is successful zero is returned, otherwise an appropriate error is returned.
vn_read(fp, offset, uio, cred, flags)
Common code for a file table vnode read. The argument fp is the file structure, The argument offset is the offset into the file.
The argument uio is the uio structure describing the memory to read into. The caller's credentials are specified in cred. The
flags argument can define FOF_UPDATE_OFFSET to update the read position in the file. If the operation is successful zero is
returned, otherwise an appropriate error is returned.
vn_poll(fp, events, l)
Common code for a file table vnode poll operation. vn_poll() simply calls VOP_POLL(9) with the events events and the calling lwp l.
The function returns a bitmask of available events.
vn_statfile(fp, sb, l)
Common code for a stat operation. The file descriptor is specified by the argument fp and sb is the buffer to return the stat
information. The argument l is the calling lwp. vn_statfile() basically calls the vnode operation VOP_GETATTR(9) and transfer the
contents of a vattr structure into a struct stat. If the operation is successful zero is returned, otherwise an appropriate error
code is returned.
vn_write(fp, offset, uio, cred, flags)
Common code for a file table vnode write. The argument fp is the file structure, The argument offset is the offset into the file.
The argument uio is the uio structure describing the memory to read from. The caller's credentials are specified in cred. The
flags argument can define FOF_UPDATE_OFFSET to update the read position in the file. If the operation is successful zero is
returned, otherwise an appropriate error is returned.
CODE REFERENCES
The high-level convenience functions are implemented within the file sys/kern/vfs_vnops.c.
SEE ALSO
file(9), intro(9), vnode(9), vnodeops(9), vnsubr(9)
BSD
April 9, 2008 BSD