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/* vi: set sw=4 ts=4: */
/*
* Mini rmmod implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
#include <sys/syscall.h>
#ifdef CONFIG_FEATURE_2_6_MODULES
static inline void filename2modname(char *modname, const char *afterslash)
{
unsigned int i;
int kr_chk = 1;
if (ENABLE_FEATURE_2_4_MODULES
&& get_linux_version_code() <= KERNEL_VERSION(2,6,0))
kr_chk = 0;
/* Convert to underscores, stop at first . */
for (i = 0; afterslash[i] && afterslash[i] != '.'; i++) {
if (kr_chk && (afterslash[i] == '-'))
modname[i] = '_';
else
modname[i] = afterslash[i];
}
modname[i] = '\0';
}
#else
void filename2modname(char *modname, const char *afterslash);
#endif
// There really should be a header file for this...
int query_module(const char *name, int which, void *buf,
size_t bufsize, size_t *ret);
int rmmod_main(int argc, char **argv)
{
int n, ret = EXIT_SUCCESS;
unsigned int flags = O_NONBLOCK|O_EXCL;
/* Parse command line. */
n = bb_getopt_ulflags(argc, argv, "wfa");
if((n & 1)) // --wait
flags &= ~O_NONBLOCK;
if((n & 2)) // --force
flags |= O_TRUNC;
if((n & 4)) {
/* Unload _all_ unused modules via NULL delete_module() call */
/* until the number of modules does not change */
size_t nmod = 0; /* number of modules */
size_t pnmod = -1; /* previous number of modules */
while (nmod != pnmod) {
if (syscall(__NR_delete_module, NULL, flags) != 0) {
if (errno==EFAULT)
return(ret);
bb_perror_msg_and_die("rmmod");
}
pnmod = nmod;
// the 1 here is QM_MODULES.
if (ENABLE_FEATURE_QUERY_MODULE_INTERFACE && query_module(NULL,
1, bb_common_bufsiz1, sizeof(bb_common_bufsiz1),
&nmod))
{
bb_perror_msg_and_die("QM_MODULES");
}
}
return EXIT_SUCCESS;
}
if (optind == argc)
bb_show_usage();
for (n = optind; n < argc; n++) {
if (ENABLE_FEATURE_2_6_MODULES) {
const char *afterslash;
afterslash = strrchr(argv[n], '/');
if (!afterslash) afterslash = argv[n];
else afterslash++;
filename2modname(bb_common_bufsiz1, afterslash);
}
if (syscall(__NR_delete_module, ENABLE_FEATURE_2_6_MODULES ? bb_common_bufsiz1 : argv[n], flags)) {
bb_perror_msg("%s", argv[n]);
ret = EXIT_FAILURE;
}
}
return(ret);
}
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