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 "busybox.h"
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11 | #include <stdio.h>
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12 | #include <errno.h>
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13 | #include <unistd.h>
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14 | #include <stdlib.h>
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15 | #include <getopt.h>
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16 | #include <fcntl.h>
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17 | #include <string.h>
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18 | #include <sys/utsname.h>
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19 | #include <sys/syscall.h>
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20 |
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21 | #ifdef CONFIG_FEATURE_2_6_MODULES
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22 | static inline void filename2modname(char *modname, const char *afterslash)
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23 | {
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24 | unsigned int i;
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25 |
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26 | #if ENABLE_FEATURE_2_4_MODULES
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27 | int kr_chk = 1;
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28 | if (get_linux_version_code() <= KERNEL_VERSION(2,6,0))
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29 | kr_chk = 0;
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30 | #else
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31 | #define kr_chk 1
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32 | #endif
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33 |
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34 | /* Convert to underscores, stop at first . */
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35 | for (i = 0; afterslash[i] && afterslash[i] != '.'; i++) {
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36 | if (kr_chk && (afterslash[i] == '-'))
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37 | modname[i] = '_';
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38 | else
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39 | modname[i] = afterslash[i];
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40 | }
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41 | modname[i] = '\0';
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42 | }
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43 | #endif
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44 |
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45 | int rmmod_main(int argc, char **argv)
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46 | {
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47 | int n, ret = EXIT_SUCCESS;
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48 | unsigned int flags = O_NONBLOCK|O_EXCL;
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49 | #ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
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50 | /* bb_common_bufsiz1 hold the module names which we ignore
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51 | but must get */
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52 | size_t bufsize = sizeof(bb_common_bufsiz1);
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53 | #endif
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54 |
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55 | /* Parse command line. */
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56 | n = bb_getopt_ulflags(argc, argv, "wfa");
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57 | if((n & 1)) // --wait
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58 | flags &= ~O_NONBLOCK;
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59 | if((n & 2)) // --force
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60 | flags |= O_TRUNC;
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61 | if((n & 4)) {
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62 | /* Unload _all_ unused modules via NULL delete_module() call */
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63 | /* until the number of modules does not change */
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64 | size_t nmod = 0; /* number of modules */
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65 | size_t pnmod = -1; /* previous number of modules */
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66 |
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67 | while (nmod != pnmod) {
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68 | if (syscall(__NR_delete_module, NULL, flags) != 0) {
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69 | if (errno==EFAULT)
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70 | return(ret);
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71 | bb_perror_msg_and_die("rmmod");
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72 | }
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73 | pnmod = nmod;
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74 | #ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
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75 | /* 1 == QM_MODULES */
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76 | if (my_query_module(NULL, 1, &bb_common_bufsiz1, &bufsize, &nmod)) {
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77 | bb_perror_msg_and_die("QM_MODULES");
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78 | }
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79 | #endif
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80 | }
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81 | return EXIT_SUCCESS;
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82 | }
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83 |
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84 | if (optind == argc)
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85 | bb_show_usage();
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86 |
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87 | for (n = optind; n < argc; n++) {
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88 | #ifdef CONFIG_FEATURE_2_6_MODULES
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89 | const char *afterslash;
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90 | char *module_name;
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91 |
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92 | afterslash = strrchr(argv[n], '/');
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93 | if (!afterslash)
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94 | afterslash = argv[n];
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95 | else
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96 | afterslash++;
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97 | module_name = alloca(strlen(afterslash) + 1);
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98 | filename2modname(module_name, afterslash);
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99 | #else
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100 | #define module_name argv[n]
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101 | #endif
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102 | if (syscall(__NR_delete_module, module_name, flags) != 0) {
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103 | bb_perror_msg("%s", argv[n]);
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104 | ret = EXIT_FAILURE;
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105 | }
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106 | }
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107 |
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108 | return(ret);
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109 | }
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