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https://github.com/opnsense/src.git
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3f6cab079c
Reviewed by: hps@ MFC after: 1 week Sponsored by: iX Systems Differential Revision: https://reviews.freebsd.org/D19258
157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2016-2018, Matthew Macy <mmacy@freebsd.org>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/param.h>
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#include <sys/sbuf.h>
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#include <sys/syslog.h>
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#include <sys/vnode.h>
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#include <linux/seq_file.h>
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#include <linux/file.h>
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#undef file
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MALLOC_DEFINE(M_LSEQ, "seq_file", "seq_file");
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ssize_t
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seq_read(struct linux_file *f, char *ubuf, size_t size, off_t *ppos)
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{
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struct seq_file *m = f->private_data;
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void *p;
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int rc;
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off_t pos = 0;
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p = m->op->start(m, &pos);
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rc = m->op->show(m, p);
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if (rc)
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return (rc);
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return (size);
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}
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int
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seq_write(struct seq_file *seq, const void *data, size_t len)
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{
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return (sbuf_bcpy(seq->buf, data, len));
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}
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/*
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* This only needs to be a valid address for lkpi
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* drivers it should never actually be called
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*/
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off_t
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seq_lseek(struct linux_file *file, off_t offset, int whence)
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{
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panic("%s not supported\n", __FUNCTION__);
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return (0);
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}
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static void *
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single_start(struct seq_file *p, off_t *pos)
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{
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return ((void *)(uintptr_t)(*pos == 0));
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}
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static void *
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single_next(struct seq_file *p, void *v, off_t *pos)
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{
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++*pos;
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return (NULL);
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}
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static void
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single_stop(struct seq_file *p, void *v)
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{
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}
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int
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seq_open(struct linux_file *f, const struct seq_operations *op)
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{
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struct seq_file *p;
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if (f->private_data != NULL)
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log(LOG_WARNING, "%s private_data not NULL", __func__);
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if ((p = malloc(sizeof(*p), M_LSEQ, M_NOWAIT|M_ZERO)) == NULL)
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return (-ENOMEM);
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f->private_data = p;
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p->op = op;
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p->file = f;
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return (0);
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}
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int
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single_open(struct linux_file *f, int (*show)(struct seq_file *, void *), void *d)
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{
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struct seq_operations *op;
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int rc = -ENOMEM;
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op = malloc(sizeof(*op), M_LSEQ, M_NOWAIT);
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if (op) {
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op->start = single_start;
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op->next = single_next;
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op->stop = single_stop;
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op->show = show;
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rc = seq_open(f, op);
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if (rc)
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free(op, M_LSEQ);
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else
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((struct seq_file *)f->private_data)->private = d;
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}
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return (rc);
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}
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int
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seq_release(struct inode *inode __unused, struct linux_file *file)
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{
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struct seq_file *m;
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m = file->private_data;
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free(m, M_LSEQ);
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return (0);
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}
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int
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single_release(struct vnode *v, struct linux_file *f)
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{
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const struct seq_operations *op = ((struct seq_file *)f->private_data)->op;
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int rc;
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rc = seq_release(v, f);
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free(__DECONST(void *, op), M_LSEQ);
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return (rc);
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}
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