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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2016-2018, Matthew Macy <mmacy@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#include <sys/sbuf.h>
#include <sys/syslog.h>
#include <sys/vnode.h>
#include <linux/seq_file.h>
#include <linux/file.h>
#undef file
MALLOC_DEFINE(M_LSEQ, "seq_file", "seq_file");
ssize_t
seq_read(struct linux_file *f, char *ubuf, size_t size, off_t *ppos)
{
struct seq_file *m = f->private_data;
void *p;
int rc;
off_t pos = 0;
p = m->op->start(m, &pos);
rc = m->op->show(m, p);
if (rc)
return (rc);
return (size);
}
int
seq_write(struct seq_file *seq, const void *data, size_t len)
{
return (sbuf_bcpy(seq->buf, data, len));
}
/*
* This only needs to be a valid address for lkpi
* drivers it should never actually be called
*/
off_t
seq_lseek(struct linux_file *file, off_t offset, int whence)
{
panic("%s not supported\n", __FUNCTION__);
return (0);
}
static void *
single_start(struct seq_file *p, off_t *pos)
{
return ((void *)(uintptr_t)(*pos == 0));
}
static void *
single_next(struct seq_file *p, void *v, off_t *pos)
{
++*pos;
return (NULL);
}
static void
single_stop(struct seq_file *p, void *v)
{
}
int
seq_open(struct linux_file *f, const struct seq_operations *op)
{
struct seq_file *p;
if (f->private_data != NULL)
log(LOG_WARNING, "%s private_data not NULL", __func__);
if ((p = malloc(sizeof(*p), M_LSEQ, M_NOWAIT|M_ZERO)) == NULL)
return (-ENOMEM);
f->private_data = p;
p->op = op;
p->file = f;
return (0);
}
int
single_open(struct linux_file *f, int (*show)(struct seq_file *, void *), void *d)
{
struct seq_operations *op;
int rc = -ENOMEM;
op = malloc(sizeof(*op), M_LSEQ, M_NOWAIT);
if (op) {
op->start = single_start;
op->next = single_next;
op->stop = single_stop;
op->show = show;
rc = seq_open(f, op);
if (rc)
free(op, M_LSEQ);
else
((struct seq_file *)f->private_data)->private = d;
}
return (rc);
}
int
seq_release(struct inode *inode __unused, struct linux_file *file)
{
struct seq_file *m;
m = file->private_data;
free(m, M_LSEQ);
return (0);
}
int
single_release(struct vnode *v, struct linux_file *f)
{
const struct seq_operations *op = ((struct seq_file *)f->private_data)->op;
int rc;
rc = seq_release(v, f);
free(__DECONST(void *, op), M_LSEQ);
return (rc);
}
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