FreeBSD/Linux Kernel Cross Reference
sys/fs/procfs/procfs.c

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 2001 Dag-Erling Smørgrav
      * Copyright (c) 1993 Jan-Simon Pendry
      * Copyright (c) 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
     * Jan-Simon Pendry.
     *
     * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)procfs_vfsops.c     8.7 (Berkeley) 5/10/95
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/queue.h>
    #include <sys/exec.h>
    #include <sys/lock.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mount.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/sbuf.h>
    #include <sys/sysproto.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <vm/vm_param.h>
    
    #include <fs/pseudofs/pseudofs.h>
    #include <fs/procfs/procfs.h>
    
    /*
     * Filler function for proc/pid/file
     */
    int
    procfs_doprocfile(PFS_FILL_ARGS)
    {
            char *fullpath;
            char *freepath;
            struct vnode *textvp;
            int error;
    
            freepath = NULL;
            PROC_LOCK(p);
            textvp = p->p_textvp;
            vhold(textvp);
            PROC_UNLOCK(p);
            error = vn_fullpath(td, textvp, &fullpath, &freepath);
            vdrop(textvp);
            if (error == 0)
                    sbuf_printf(sb, "%s", fullpath);
            if (freepath != NULL)
                    free(freepath, M_TEMP);
            return (error);
    }
    
    /*
     * Filler function for proc/curproc
     */
    int
    procfs_docurproc(PFS_FILL_ARGS)
    {
            sbuf_printf(sb, "%ld", (long)td->td_proc->p_pid);
            return (0);
    }
   
   static int
   procfs_attr(PFS_ATTR_ARGS, int mode) {
   
           vap->va_mode = mode;
           if (p != NULL) {
                   PROC_LOCK_ASSERT(p, MA_OWNED);
   
                   if ((p->p_flag & P_SUGID) && pn->pn_type != pfstype_procdir)
                           vap->va_mode = 0;
           }
   
           return (0);
   }
   
   int
   procfs_attr_all_rx(PFS_ATTR_ARGS)
   {
   
           return (procfs_attr(td, p, pn, vap, 0555));
   }
   
   int
   procfs_attr_rw(PFS_ATTR_ARGS)
   {
   
           return (procfs_attr(td, p, pn, vap, 0600));
   }
   
   int
   procfs_attr_w(PFS_ATTR_ARGS)
   {
   
           return (procfs_attr(td, p, pn, vap, 0200));
   }
   
   /*
    * Visibility: some files only exist for non-system processes
    * Non-static because linprocfs uses it.
    */
   int
   procfs_notsystem(PFS_VIS_ARGS)
   {
           PROC_LOCK_ASSERT(p, MA_OWNED);
           return ((p->p_flag & P_SYSTEM) == 0);
   }
   
   /*
    * Visibility: some files are only visible to process that can debug
    * the target process.
    */
   int
   procfs_candebug(PFS_VIS_ARGS)
   {
           PROC_LOCK_ASSERT(p, MA_OWNED);
           return ((p->p_flag & P_SYSTEM) == 0 && p_candebug(td, p) == 0);
   }
   
   /*
    * Constructor
    */
   static int
   procfs_init(PFS_INIT_ARGS)
   {
           struct pfs_node *root;
           struct pfs_node *dir;
           struct pfs_node *node;
   
           root = pi->pi_root;
   
           pfs_create_link(root, "curproc", procfs_docurproc,
               NULL, NULL, NULL, 0);
   
           dir = pfs_create_dir(root, "pid",
               procfs_attr_all_rx, NULL, NULL, PFS_PROCDEP);
           pfs_create_file(dir, "cmdline", procfs_doproccmdline,
               NULL, NULL, NULL, PFS_RD);
           pfs_create_file(dir, "dbregs", procfs_doprocdbregs,
               procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
           pfs_create_file(dir, "etype", procfs_doproctype,
               NULL, NULL, NULL, PFS_RD);
           pfs_create_file(dir, "fpregs", procfs_doprocfpregs,
               procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
           pfs_create_file(dir, "map", procfs_doprocmap,
               NULL, procfs_notsystem, NULL, PFS_RD);
           node = pfs_create_file(dir, "mem", procfs_doprocmem,
               procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
           node->pn_ioctl = procfs_ioctl;
           node->pn_close = procfs_close;
           pfs_create_file(dir, "note", procfs_doprocnote,
               procfs_attr_w, procfs_candebug, NULL, PFS_WR);
           pfs_create_file(dir, "notepg", procfs_doprocnote,
               procfs_attr_w, procfs_candebug, NULL, PFS_WR);
           pfs_create_file(dir, "regs", procfs_doprocregs,
               procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR | PFS_RAW);
           pfs_create_file(dir, "rlimit", procfs_doprocrlimit,
               NULL, NULL, NULL, PFS_RD);
           pfs_create_file(dir, "status", procfs_doprocstatus,
               NULL, NULL, NULL, PFS_RD);
           pfs_create_file(dir, "osrel", procfs_doosrel,
               procfs_attr_rw, procfs_candebug, NULL, PFS_RDWR);
   
           pfs_create_link(dir, "file", procfs_doprocfile,
               NULL, procfs_notsystem, NULL, 0);
   
           return (0);
   }
   
   /*
    * Destructor
    */
   static int
   procfs_uninit(PFS_INIT_ARGS)
   {
           /* nothing to do, pseudofs will GC */
           return (0);
   }
   
   PSEUDOFS(procfs, 1, VFCF_JAIL);

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