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-rw-r--r--modutils/rmmod.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/modutils/rmmod.c b/modutils/rmmod.c
new file mode 100644
index 000000000..22e864d57
--- /dev/null
+++ b/modutils/rmmod.c
@@ -0,0 +1,96 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini rmmod implementation for busybox
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include "busybox.h"
11#include <sys/syscall.h>
12
13#ifdef CONFIG_FEATURE_2_6_MODULES
14static inline void filename2modname(char *modname, const char *afterslash)
15{
16 unsigned int i;
17 int kr_chk = 1;
18
19 if (ENABLE_FEATURE_2_4_MODULES
20 && get_linux_version_code() <= KERNEL_VERSION(2,6,0))
21 kr_chk = 0;
22
23 /* Convert to underscores, stop at first . */
24 for (i = 0; afterslash[i] && afterslash[i] != '.'; i++) {
25 if (kr_chk && (afterslash[i] == '-'))
26 modname[i] = '_';
27 else
28 modname[i] = afterslash[i];
29 }
30 modname[i] = '\0';
31}
32#else
33void filename2modname(char *modname, const char *afterslash);
34#endif
35
36// There really should be a header file for this...
37
38int query_module(const char *name, int which, void *buf,
39 size_t bufsize, size_t *ret);
40
41int rmmod_main(int argc, char **argv)
42{
43 int n, ret = EXIT_SUCCESS;
44 unsigned int flags = O_NONBLOCK|O_EXCL;
45
46 /* Parse command line. */
47 n = getopt32(argc, argv, "wfa");
48 if((n & 1)) // --wait
49 flags &= ~O_NONBLOCK;
50 if((n & 2)) // --force
51 flags |= O_TRUNC;
52 if((n & 4)) {
53 /* Unload _all_ unused modules via NULL delete_module() call */
54 /* until the number of modules does not change */
55 size_t nmod = 0; /* number of modules */
56 size_t pnmod = -1; /* previous number of modules */
57
58 while (nmod != pnmod) {
59 if (syscall(__NR_delete_module, NULL, flags) != 0) {
60 if (errno == EFAULT)
61 return ret;
62 bb_perror_msg_and_die("rmmod");
63 }
64 pnmod = nmod;
65 // the 1 here is QM_MODULES.
66 if (ENABLE_FEATURE_QUERY_MODULE_INTERFACE && query_module(NULL,
67 1, bb_common_bufsiz1, sizeof(bb_common_bufsiz1),
68 &nmod))
69 {
70 bb_perror_msg_and_die("QM_MODULES");
71 }
72 }
73 return EXIT_SUCCESS;
74 }
75
76 if (optind == argc)
77 bb_show_usage();
78
79 for (n = optind; n < argc; n++) {
80 if (ENABLE_FEATURE_2_6_MODULES) {
81 const char *afterslash;
82
83 afterslash = strrchr(argv[n], '/');
84 if (!afterslash) afterslash = argv[n];
85 else afterslash++;
86 filename2modname(bb_common_bufsiz1, afterslash);
87 }
88
89 if (syscall(__NR_delete_module, ENABLE_FEATURE_2_6_MODULES ? bb_common_bufsiz1 : argv[n], flags)) {
90 bb_perror_msg("%s", argv[n]);
91 ret = EXIT_FAILURE;
92 }
93 }
94
95 return ret;
96}