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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/open.h>
struct nlist _glibtop_nlist[] = {
#ifdef i386
{ "avenrun" }, /* 0 */
{ "ccpu" }, /* 1 */
{ "mpid" }, /* 2 */
{ "nproc" }, /* 3 */
{ "proc" }, /* 4 */
{ "total" }, /* 5 */
{ "cp_time" }, /* 6 */
{ "pages" }, /* 7 */
{ "epages" }, /* 8 */
#else
{ "_avenrun" }, /* 0 */
{ "_ccpu" }, /* 1 */
{ "_mpid" }, /* 2 */
{ "_nproc" }, /* 3 */
{ "_proc" }, /* 4 */
{ "_total" }, /* 5 */
{ "_cp_time" }, /* 6 */
{ "_pages" }, /* 7 */
{ "_epages" }, /* 8 */
#ifdef MULTIPROCESSOR
{ "_ncpu" },
{ "_mp_time" },
#endif
#endif
{ 0 }
};
/* Opens pipe to gtop server. Returns 0 on success and -1 on error. */
/* !!! THIS FUNCTION RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
void
glibtop_open (glibtop *server, const char *program_name)
{
/* !!! WE ARE ROOT HERE - CHANGE WITH CAUTION !!! */
memset (server, 0, sizeof (glibtop));
server->name = program_name;
server->machine.uid = getuid ();
server->machine.euid = geteuid ();
server->machine.gid = getgid ();
server->machine.egid = getegid ();
/* initialize the kernel interface */
server->machine.kd = kvm_open (NULL, NULL, NULL, O_RDONLY, "libgtop");
if (server->machine.kd == NULL)
glibtop_error__r (server, "kvm_open: %s", strerror (errno));
/* get the list of symbols we want to access in the kernel */
server->machine.nlist_count = kvm_nlist (server->machine.kd, _glibtop_nlist);
if (server->machine.nlist_count < 0)
glibtop_error__r (server, "nlist: %s", strerror (errno));
#ifdef MULTIPROCESSOR
/* were ncpu and xp_time not found in the nlist? */
if ((server->machine.nlist_count > 0) && (_glibtop_nlist[X_NCPU].n_type == 0) &&
(_glibtop_nlist[X_MP_TIME].n_type == 0)) {
/* we were compiled on an MP system but we are not running on one */
/* so we will pretend this didn't happen and set ncpu = 1 */
server->machine.nlist_count -= 2;
server->machine.ncpu = 1;
}
#endif
#ifdef solbourne
{
unsigned int status, type;
/* Get the number of CPUs on this system. */
syscall(SYS_getcpustatus, &status, &server->machine.ncpu, &type);
}
#endif
/* Make sure all of the symbols were found. */
if ((server->machine.nlist_count > 0) &&
(_glibtop_check_nlist (server, _glibtop_nlist) > 0))
_exit (1);
/* Drop priviledges. */
if (setreuid (server->machine.euid, server->machine.uid))
_exit (1);
if (setregid (server->machine.egid, server->machine.gid))
_exit (1);
/* !!! END OF SUID ROOT PART !!! */
/* Our effective uid is now those of the user invoking the server,
so we do no longer have any priviledges.
*/
/* NOTE: On SunOS, we do not need to be suid root, we just need to be sgid kmem.
* The server will only use setegid() to get back it's priviledges, so it
* will fail if it is suid root and not sgid kmem.
*/
}
/* Used internally. Returns number of symbols that cannot be found in the nlist. */
int
_glibtop_check_nlist (void *server, register struct nlist *nlst)
{
register int not_found;
/* check to see if we got ALL the symbols we requested */
/* this will write one line to stderr for every symbol not found */
not_found = 0;
while (nlst->n_name != NULL) {
#ifdef i386
if (nlst->n_value == 0) {
glibtop_error__r (server, "kernel: no symbol named `%s'", nlst->n_name);
not_found++;
}
#else
if (nlst->n_type == 0) {
glibtop_error__r (server, "kernel: no symbol named `%s'", nlst->n_name);
not_found++;
}
#endif
nlst++;
}
return not_found;
}
/* Used internally. Fetches value from kernel. */
int
_glibtop_getkval (void *void_server, unsigned long offset, int *ptr, int size, char *refstr)
{
glibtop *server = (glibtop *) void_server;
if (kvm_read (server->machine.kd, offset, ptr, size) != size)
{
if (*refstr == '!') return 0;
glibtop_error__r (server, "kvm_read(%s): %s",
refstr, strerror (errno));
}
return 1;
}
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