libbb/module_syscalls.c

/* vi: set sw=4 ts=4: */
/*
 * some system calls possibly missing from libc
 *
 * Copyright (C) 1999,2000,2001 by Lineo, inc.
 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
/* Kernel headers before 2.1.mumble need this on the Alpha to get
   _syscall* defined.  */
#define __LIBRARY__
#include <sys/syscall.h>
#ifndef __UCLIBC__
#include <asm/unistd.h>
#endif
#include "libbb.h"


#if __GNU_LIBRARY__ < 5
/* These syscalls are not included as part of libc5 */
_syscall1(int, delete_module, const char *, name);
_syscall1(int, get_kernel_syms, __ptr_t, ks);

/* This may have 5 arguments (for old 2.0 kernels) or 2 arguments
 * (for 2.2 and 2.4 kernels).  Use the greatest common denominator,
 * and let the kernel cope with whatever it gets.  Its good at that. */
_syscall5(int, init_module, void *, first, void *, second, void *, third,
		void *, fourth, void *, fifth);

#ifndef __NR_query_module
#warning This kernel does not support the query_module syscall
#warning -> The query_module system call is being stubbed out...
int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret)
{
	fprintf(stderr, "\n\nTo make this application work, you will need to recompile\n");
	fprintf(stderr, "with a kernel supporting the query_module system call. -Erik\n\n");
	errno=ENOSYS;
	return -1;
}
#else
_syscall5(int, query_module, const char *, name, int, which,
		void *, buf, size_t, bufsize, size_t*, ret);
#endif

/* Jump through hoops to fixup error return codes */
#define __NR___create_module  __NR_create_module
static inline _syscall2(long, __create_module, const char *, name, size_t, size)
unsigned long create_module(const char *name, size_t size)
{
	long ret = __create_module(name, size);

	if (ret == -1 && errno > 125) {
		ret = -errno;
		errno = 0;
	}
	return ret;
}

#endif /* __GNU_LIBRARY__ < 5 */


/* END CODE */
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/