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/* Copyright (C) 1998-99 Martin Baulig
This file is part of LibGTop 1.0.
Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
LibGTop is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
LibGTop 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/proclist.h>
#include <glibtop_suid.h>
static const unsigned long _glibtop_sysdeps_proclist =
(1L << GLIBTOP_PROCLIST_TOTAL) + (1L << GLIBTOP_PROCLIST_NUMBER) +
(1L << GLIBTOP_PROCLIST_SIZE);
/* Init function. */
void
_glibtop_init_proclist_p (glibtop *server)
{
server->sysdeps.proclist = _glibtop_sysdeps_proclist;
}
/* 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_p (glibtop *server, glibtop_proclist *buf,
gint64 which, gint64 arg)
{
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_p (server, GLIBTOP_SYSDEPS_PROCLIST, 0);
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 !!! */
glibtop_suid_enter (server);
max_elements = table
(TBL_PROCINFO, entry, (char *) &procinfo,
ELEMENTS_PER_ENTRY, sizeof (struct tbl_procinfo));
glibtop_suid_leave (server);
/* !!! 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;
/* 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 g_realloc ()
* will be equivalent to g_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 = g_realloc
(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 g_realloc () will be equivalent to
* g_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 = g_realloc (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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