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/* $Id$ */
/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
This file is part of the Gnome Top Library.
Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
The Gnome Top Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Gnome Top Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/xmalloc.h>
#include <glibtop/proclist.h>
static const unsigned long _glibtop_sysdeps_proclist =
(1 << GLIBTOP_PROCLIST_TOTAL) + (1 << GLIBTOP_PROCLIST_NUMBER) +
(1 << GLIBTOP_PROCLIST_SIZE);
/* How many elements are there per proctable entry? */
#define ELEMENTS_PER_ENTRY 8
/* We have a buffer for BLOCK_COUNT pids; when it's full, it is copied
* to a newly realloc()ed area. */
#define BLOCK_COUNT 256
#define BLOCK_SIZE (BLOCK_COUNT * sizeof (unsigned))
/* Fetch list of currently running processes.
*
* The interface of this function is a little bit different from the others:
* buf->flags is only set if the call succeeded, in this case pids_chain,
* a list of the pids of all currently running processes is returned,
* buf->number is the number of elements of this list and buf->size is
* the size of one single element (sizeof (unsigned)). The total size is
* stored in buf->total.
*
* The calling function has to free the memory to which a pointer is returned.
*
* On error, NULL is returned and buf->flags is zero. */
/* !!! THIS FUNCTION RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
unsigned *
glibtop_get_proclist__r (glibtop *server, glibtop_proclist *buf)
{
unsigned count = 0, total = 0;
unsigned pids [BLOCK_COUNT], *pids_chain = NULL;
unsigned pids_size = 0, pids_offset = 0, new_size;
struct tbl_procinfo procinfo [8];
int entry, max_elements, k;
glibtop_init ();
memset (buf, 0, sizeof (glibtop_proclist));
for (entry = 0; entry < server->machine.proctable_entries;
entry += ELEMENTS_PER_ENTRY)
{
/* !!! THE FOLLOWING CODE RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
setreuid (server->machine.uid, server->machine.euid);
max_elements = table (TBL_PROCINFO, entry, (char *) &procinfo,
ELEMENTS_PER_ENTRY, sizeof (struct tbl_procinfo));
if (setreuid (server->machine.euid, server->machine.uid))
_exit (1);
/* !!! END OF SUID ROOT PART !!! */
for (k = 0; k < max_elements; k++)
{
/* Does this entry contain a real process? */
if (procinfo [k].pi_status == 0)
continue;
/* The following code is copied from the Linux implementation.
* It's safe since we are no longer root at this point here. */
/* Fine. Now we first try to store it in pids. If this buffer is
* full, we copy it to the pids_chain. */
if (count >= BLOCK_COUNT) {
/* The following call to glibtop_realloc will be equivalent to
* glibtop_malloc if pids_chain is NULL. We just calculate the
* new size and copy pids to the beginning of the newly allocated
* block. */
new_size = pids_size + BLOCK_SIZE;
pids_chain = glibtop_realloc__r (server, pids_chain, new_size);
memcpy (pids_chain + pids_offset, pids, BLOCK_SIZE);
pids_size = new_size;
pids_offset += BLOCK_COUNT;
count = 0;
}
/* pids is now big enough to hold at least one single pid. */
pids [count++] = procinfo [k].pi_pid;
total++;
}
}
/* count is only zero if an error occured (eg. the server is not suid root). */
if (!count) return NULL;
/* The following call to glibtop_realloc will be equivalent to
* glibtop_malloc if pids_chain is NULL. We just calculate the
* new size and copy pids to the beginning of the newly allocated
* block. */
new_size = pids_size + count * sizeof (unsigned);
pids_chain = glibtop_realloc__r (server, pids_chain, new_size);
memcpy (pids_chain + pids_offset, pids, count * sizeof (unsigned));
pids_size = new_size;
pids_offset += BLOCK_COUNT;
/* Since everything is ok now, we can set buf->flags, fill in the remaining fields
and return pids_chain. */
buf->flags = _glibtop_sysdeps_proclist;
buf->size = sizeof (unsigned);
buf->number = total;
buf->total = total * sizeof (unsigned);
return pids_chain;
}
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