f3f051ecba
1998-07-24 Martin Baulig <martin@home-of-linux.org> * sysdeps/{kernel, linux}/*.c: Replaced `glibtop_init_r' with `glibtop_init_s'. * sysdeps/sun4/open.c (glibtop_init_p): Removed `program_name' parameter. * sysdeps/osf1/glibtop_suid.h: New file. * sysdeps/osf1/glibtop_server.h: Now correctly using `(1 << GLIBTOP_SYSDEPS_*)' instead of `GLIBTOP_SYSDEPS_*'. * sysdeps/osf1/open_suid.c (glibtop_init_p): New function. * sysdeps/osf1/proc*.c: Done some more work here.
162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
/* $Id$ */
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/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the Gnome Top Library.
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Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
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The Gnome Top Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The Gnome Top Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <glibtop.h>
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#include <glibtop/error.h>
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#include <glibtop/xmalloc.h>
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#include <glibtop/proclist.h>
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#include <glibtop_suid.h>
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static const unsigned long _glibtop_sysdeps_proclist =
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(1 << GLIBTOP_PROCLIST_TOTAL) + (1 << GLIBTOP_PROCLIST_NUMBER) +
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(1 << GLIBTOP_PROCLIST_SIZE);
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/* How many elements are there per proctable entry? */
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#define ELEMENTS_PER_ENTRY 8
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/* We have a buffer for BLOCK_COUNT pids; when it's full, it is copied
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* to a newly realloc()ed area. */
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#define BLOCK_COUNT 256
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#define BLOCK_SIZE (BLOCK_COUNT * sizeof (unsigned))
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/* Fetch list of currently running processes.
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*
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* The interface of this function is a little bit different from the others:
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* buf->flags is only set if the call succeeded, in this case pids_chain,
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* a list of the pids of all currently running processes is returned,
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* buf->number is the number of elements of this list and buf->size is
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* the size of one single element (sizeof (unsigned)). The total size is
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* stored in buf->total.
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*
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* The calling function has to free the memory to which a pointer is returned.
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*
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* On error, NULL is returned and buf->flags is zero. */
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/* !!! THIS FUNCTION RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
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unsigned *
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glibtop_get_proclist_p (glibtop *server, glibtop_proclist *buf)
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{
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unsigned count = 0, total = 0;
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unsigned pids [BLOCK_COUNT], *pids_chain = NULL;
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unsigned pids_size = 0, pids_offset = 0, new_size;
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struct tbl_procinfo procinfo [8];
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int entry, max_elements, k;
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glibtop_init_p (server, 0, 0);
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memset (buf, 0, sizeof (glibtop_proclist));
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for (entry = 0; entry < server->machine.proctable_entries;
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entry += ELEMENTS_PER_ENTRY)
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{
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/* !!! THE FOLLOWING CODE RUNS SUID ROOT -
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* CHANGE WITH CAUTION !!! */
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glibtop_suid_enter (server);
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max_elements = table
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(TBL_PROCINFO, entry, (char *) &procinfo,
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ELEMENTS_PER_ENTRY, sizeof (struct tbl_procinfo));
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glibtop_suid_leave (server);
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/* !!! END OF SUID ROOT PART !!! */
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for (k = 0; k < max_elements; k++)
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{
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/* Does this entry contain a real process? */
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if (procinfo [k].pi_status == 0)
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continue;
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/* Fine. Now we first try to store it in pids.
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* If this buffer is full, we copy it to the
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* pids_chain. */
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if (count >= BLOCK_COUNT) {
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/* The following call to glibtop_realloc ()
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* will be equivalent to glibtop_malloc ()
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* if `pids_chain' is NULL. We just calculate
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* the new size and copy `pids' to the
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* beginning of the newly allocated block. */
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new_size = pids_size + BLOCK_SIZE;
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pids_chain = glibtop_realloc_r
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(server, pids_chain, new_size);
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memcpy (pids_chain + pids_offset,
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pids, BLOCK_SIZE);
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pids_size = new_size;
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pids_offset += BLOCK_COUNT;
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count = 0;
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}
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/* pids is now big enough to hold at least
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* one single pid. */
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pids [count++] = procinfo [k].pi_pid;
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total++;
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}
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}
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/* count is only zero if an error occured
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* (eg. the server is not suid root). */
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if (!count) return NULL;
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/* The following call to glibtop_realloc () will be equivalent to
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* glibtop_malloc () if `pids_chain' is NULL. We just calculate the
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* new size and copy `pids' to the beginning of the newly allocated
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* block. */
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new_size = pids_size + count * sizeof (unsigned);
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pids_chain = glibtop_realloc_r (server, pids_chain, new_size);
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memcpy (pids_chain + pids_offset, pids, count * sizeof (unsigned));
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pids_size = new_size;
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pids_offset += BLOCK_COUNT;
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/* Since everything is ok now, we can set buf->flags, fill in the
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* remaining fields and return `pids_chain'. */
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buf->flags = _glibtop_sysdeps_proclist;
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buf->size = sizeof (unsigned);
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buf->number = total;
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buf->total = total * sizeof (unsigned);
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return pids_chain;
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}
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