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