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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [proc/] [net.c] - Blame information for rev 1628

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Line No. Rev Author Line
1 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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