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1628 |
jcastillo |
/*
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* linux/fs/proc/net.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* gjh 3/'93 heim@peanuts.informatik.uni-tuebingen.de (Gerald J. Heim)
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* most of this file is stolen from base.c
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* it works, but you shouldn't use it as a guideline
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* for new proc-fs entries. once i'll make it better.
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* fvk 3/'93 waltje@uwalt.nl.mugnet.org (Fred N. van Kempen)
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* cleaned up the whole thing, moved "net" specific code to
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* the NET kernel layer (where it belonged in the first place).
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* Michael K. Johnson (johnsonm@stolaf.edu) 3/93
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* Added support from my previous inet.c. Cleaned things up
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* quite a bit, modularized the code.
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* fvk 4/'93 waltje@uwalt.nl.mugnet.org (Fred N. van Kempen)
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* Renamed "route_get_info()" to "rt_get_info()" for consistency.
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* Alan Cox (gw4pts@gw4pts.ampr.org) 4/94
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* Dusted off the code and added IPX. Fixed the 4K limit.
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* Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de)
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* /proc/net/snmp.
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* Alan Cox (gw4pts@gw4pts.ampr.org) 1/95
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* Added Appletalk slots
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*
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* proc net directory handling functions
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <asm/segment.h>
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#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
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static int proc_readnet(struct inode * inode, struct file * file,
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char * buf, int count)
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{
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char * page;
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int bytes=count;
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int copied=0;
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char *start;
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struct proc_dir_entry * dp;
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if (count < 0)
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return -EINVAL;
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dp = (struct proc_dir_entry *) inode->u.generic_ip;
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if (!(page = (char*) __get_free_page(GFP_KERNEL)))
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return -ENOMEM;
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while (bytes>0)
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{
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int length, thistime=bytes;
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if (bytes > PROC_BLOCK_SIZE)
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thistime=PROC_BLOCK_SIZE;
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length = dp->get_info(page, &start,
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file->f_pos,
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thistime,
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(file->f_flags & O_ACCMODE) == O_RDWR);
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/*
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* We have been given a non page aligned block of
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* the data we asked for + a bit. We have been given
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* the start pointer and we know the length..
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*/
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if (length <= 0)
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break;
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/*
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* Copy the bytes
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*/
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memcpy_tofs(buf+copied, start, length);
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file->f_pos += length; /* Move down the file */
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bytes -= length;
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copied += length;
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if (length<thistime)
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break; /* End of file */
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}
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free_page((unsigned long) page);
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return copied;
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}
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static struct file_operations proc_net_operations = {
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NULL, /* lseek - default */
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proc_readnet, /* read - bad */
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NULL, /* write - bad */
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NULL, /* readdir */
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NULL, /* select - default */
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NULL, /* ioctl - default */
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NULL, /* mmap */
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NULL, /* no special open code */
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NULL, /* no special release code */
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NULL /* can't fsync */
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};
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/*
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* proc directories can do almost nothing..
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*/
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struct inode_operations proc_net_inode_operations = {
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&proc_net_operations, /* default net file-ops */
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NULL, /* create */
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NULL, /* lookup */
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NULL, /* link */
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NULL, /* unlink */
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NULL, /* symlink */
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NULL, /* mkdir */
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NULL, /* rmdir */
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NULL, /* mknod */
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NULL, /* rename */
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NULL, /* readlink */
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NULL, /* follow_link */
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NULL, /* readpage */
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NULL, /* writepage */
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NULL, /* bmap */
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NULL, /* truncate */
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NULL /* permission */
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};
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