Blame sysdeps/aix/open.c

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/* Copyright (C) 1998-99 Martin Baulig
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   This file is part of LibGTop 1.0.
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   Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
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   LibGTop is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License,
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   or (at your option) any later version.
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   LibGTop is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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   for more details.
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   You should have received a copy of the GNU General Public License
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   along with LibGTop; see the file COPYING. If not, write to the
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   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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   Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <glibtop.h>
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#include <glibtop/error.h>
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#include <glibtop/open.h>
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#include <glibtop/init_hooks.h>
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#include "glibtop_suid.h"
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/* !!! THIS FUNCTION RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
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void
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glibtop_init_p (glibtop *server, const unsigned long features,
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                const unsigned flags)
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{
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	const _glibtop_init_func_t *init_fkt;
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	if (server == NULL)
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		glibtop_error_r (NULL, "glibtop_init_p (server == NULL)");
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	if ((server->flags & _GLIBTOP_INIT_STATE_SYSDEPS) == 0) {
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		glibtop_open_p (server, "glibtop", features, flags);
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		for (init_fkt = _glibtop_init_hook_p; *init_fkt; init_fkt++)
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			(*init_fkt) (server);
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		server->flags |= _GLIBTOP_INIT_STATE_SYSDEPS;
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	}
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}
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/* Opens pipe to gtop server. Returns 0 on success and -1 on error. */
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void
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glibtop_open_p (glibtop *server, const char *program_name,
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		const unsigned long features, const unsigned flags)
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{
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	/* !!! WE ARE ROOT HERE - CHANGE WITH CAUTION !!! */
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	server->machine->uid = getuid ();
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	server->machine->euid = geteuid ();
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	server->machine->gid = getgid ();
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	server->machine->egid = getegid ();
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	/* open kmem */
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	server->machine->kmem_fd = open("/dev/kmem", O_RDONLY);
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	if (server->machine->kmem_fd == -1)
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		glibtop_error_io_r (server, "Cannot open /dev/kmem");
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	/* Drop priviledges. */
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	if (seteuid (server->machine->uid))
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		_exit (1);
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	if (setegid (server->machine->gid))
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		_exit (1);
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	/* !!! END OF SUID ROOT PART !!! */
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	server->name = program_name;
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}