annotate main.c @ 995:893c86bbe452

Add daemonize function to lib for klogd and syslogd
author Felix Janda <felix.janda@posteo.de>
date Sat, 10 Aug 2013 20:18:18 +0200
parents caa05719070f
children 71f64e2f24a9
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1 /* Toybox infrastructure.
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2 *
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3 * Copyright 2006 Rob Landley <rob@landley.net>
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4 */
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5
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6 #include "toys.h"
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6475d6c46066 Add pwd. Consolidate toy list information under toylist.h.
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8 // Populate toy_list[].
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10 #undef NEWTOY
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11 #undef OLDTOY
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12 #define NEWTOY(name, opts, flags) {#name, name##_main, opts, flags},
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13 #define OLDTOY(name, oldname, opts, flags) {#name, oldname##_main, opts, flags},
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15 struct toy_list toy_list[] = {
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16 #include "generated/newtoys.h"
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17 };
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19 // global context for this command.
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20
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21 struct toy_context toys;
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22 union global_union this;
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23 char toybuf[4096];
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25 struct toy_list *toy_find(char *name)
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26 {
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27 int top, bottom, middle;
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29 // If the name starts with "toybox" accept that as a match. Otherwise
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30 // skip the first entry, which is out of order.
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32 if (!strncmp(name,"toybox",6)) return toy_list;
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33 bottom = 1;
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35 // Binary search to find this command.
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37 top = ARRAY_LEN(toy_list)-1;
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38 for (;;) {
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39 int result;
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41 middle = (top+bottom)/2;
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42 if (middle<bottom || middle>top) return NULL;
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43 result = strcmp(name,toy_list[middle].name);
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44 if (!result) return toy_list+middle;
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45 if (result<0) top=--middle;
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46 else bottom = ++middle;
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47 }
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48 }
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50 // Figure out whether or not anything is using the option parsing logic,
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51 // because the compiler can't figure out whether or not to optimize it away
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52 // on its' own. NEED_OPTIONS becomes a constant allowing if() to optimize
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53 // stuff out via dead code elimination.
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54
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55 #undef NEWTOY
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56 #undef OLDTOY
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57 #define NEWTOY(name, opts, flags) opts ||
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58 #define OLDTOY(name, oldname, opts, flags) opts ||
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59 static const int NEED_OPTIONS =
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60 #include "generated/newtoys.h"
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61 0; // Ends the opts || opts || opts...
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62
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63 // Subset of init needed by singlemain
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64 static void toy_singleinit(struct toy_list *which, char *argv[])
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65 {
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66 toys.which = which;
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67 toys.argv = argv;
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68
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69 if (CFG_TOYBOX_HELP_DASHDASH && argv[1] && !strcmp(argv[1], "--help")) {
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70 show_help();
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71 xexit();
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72 }
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73
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74 if (NEED_OPTIONS && which->options) get_optflags();
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75 else {
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76 toys.optargs = argv+1;
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77 for (toys.optc=0; toys.optargs[toys.optc]; toys.optc++);
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78 }
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79 toys.old_umask = umask(0);
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80 if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask);
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81 }
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83 // Setup toybox global state for this command.
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84
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85 void toy_init(struct toy_list *which, char *argv[])
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86 {
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87 // Drop permissions for non-suid commands.
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89 if (CFG_TOYBOX_SUID) {
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90 uid_t uid = getuid(), euid = geteuid();
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92 if (!(which->flags & TOYFLAG_STAYROOT)) {
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93 if (uid != euid) xsetuid(euid=uid);
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94 } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list)
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95 error_msg("Not installed suid root");
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97 if ((which->flags & TOYFLAG_NEEDROOT) && euid) error_exit("Not root");
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98 }
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99
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100 // Free old toys contents (to be reentrant), but leave rebound if any
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101
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102 if (toys.optargs != toys.argv+1) free(toys.optargs);
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103 memset(&toys, 0, offsetof(struct toy_context, rebound));
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104
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105 // Subset of init needed by singlemain.
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106 toy_singleinit(which, argv);
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107 }
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108
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109 // Like exec() but runs an internal toybox command instead of another file.
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110 // Only returns if it can't find the command, otherwise exit() when done.
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111 void toy_exec(char *argv[])
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112 {
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113 struct toy_list *which;
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114
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115 if (!(which = toy_find(argv[0]))) return;
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116 toy_init(which, argv);
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117 toys.which->toy_main();
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118 if (fflush(NULL) || ferror(stdout)) perror_exit("write");
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119 xexit();
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120 }
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121
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122 // Multiplexer command, first argument is command to run, rest are args to that.
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123 // If first argument starts with - output list of command install paths.
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124
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125 void toybox_main(void)
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126 {
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127 static char *toy_paths[]={"usr/","bin/","sbin/",0};
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128 int i, len = 0;
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129
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130 toys.which = toy_list;
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131 if (toys.argv[1]) {
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132 if (CFG_TOYBOX_HELP_DASHDASH && !strcmp(toys.argv[1], "--help")) {
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133 if (toys.argv[2]) toys.which = toy_find(toys.argv[2]);
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134 if (toys.which) {
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135 show_help();
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136 return;
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137 }
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138 } else {
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139 toy_exec(toys.argv+1);
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140 if (toys.argv[1][0] == '-') goto list;
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141 }
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142
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143 error_exit("Unknown command %s",toys.argv[1]);
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144 }
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145
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146 list:
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147 // Output list of command.
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148 for (i=1; i<ARRAY_LEN(toy_list); i++) {
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149 int fl = toy_list[i].flags;
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150 if (fl & TOYMASK_LOCATION) {
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151 if (toys.argv[1]) {
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152 int j;
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153 for (j=0; toy_paths[j]; j++)
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154 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
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155 }
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156 len += printf("%s ",toy_list[i].name);
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157 if (len>65) {
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158 xputc('\n');
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159 len=0;
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160 }
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161 }
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162 }
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163 xputc('\n');
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164 }
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165
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166 int main(int argc, char *argv[])
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167 {
712
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168 if (CFG_TOYBOX_I18N) setlocale(LC_ALL, "");
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169
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170 if (!CFG_TOYBOX_SINGLE) {
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171 // Trim path off of command name
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172 *argv = basename(*argv);
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173
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174 // Call the multiplexer, adjusting this argv[] to be its' argv[1].
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175 // (It will adjust it back before calling toy_exec().)
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176 toys.argv = argv-1;
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177 toybox_main();
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178 } else {
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179 // a single toybox command built standalone with no multiplexer
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180 toy_singleinit(toy_list, argv);
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181 toy_list->toy_main();
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182 if (fflush(NULL) || ferror(stdout)) perror_exit("write");
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183 }
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184
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185 return toys.exitval;
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186 }