1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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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 | * Copyright (C) 2006 Rob Landley
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7 | * Copyright (C) 2006 Denys Vlasenko
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8 | *
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9 | * Licensed under GPLv2, see file LICENSE in this source tree.
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10 | */
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11 |
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12 | /* We need to have separate xfuncs.c and xfuncs_printf.c because
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13 | * with current linkers, even with section garbage collection,
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14 | * if *.o module references any of XXXprintf functions, you pull in
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15 | * entire printf machinery. Even if you do not use the function
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16 | * which uses XXXprintf.
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17 | *
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18 | * xfuncs.c contains functions (not necessarily xfuncs)
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19 | * which do not pull in printf, directly or indirectly.
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20 | * xfunc_printf.c contains those which do.
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21 | */
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22 |
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23 | #include "libbb.h"
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24 |
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25 |
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26 | /* All the functions starting with "x" call bb_error_msg_and_die() if they
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27 | * fail, so callers never need to check for errors. If it returned, it
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28 | * succeeded. */
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29 |
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30 | #ifndef DMALLOC
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31 | /* dmalloc provides variants of these that do abort() on failure.
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32 | * Since dmalloc's prototypes overwrite the impls here as they are
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33 | * included after these prototypes in libbb.h, all is well.
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34 | */
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35 | // Warn if we can't allocate size bytes of memory.
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36 | void* FAST_FUNC malloc_or_warn(size_t size)
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37 | {
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38 | void *ptr = malloc(size);
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39 | if (ptr == NULL && size != 0)
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40 | bb_error_msg(bb_msg_memory_exhausted);
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41 | return ptr;
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42 | }
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43 |
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44 | // Die if we can't allocate size bytes of memory.
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45 | void* FAST_FUNC xmalloc(size_t size)
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46 | {
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47 | void *ptr = malloc(size);
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48 | if (ptr == NULL && size != 0)
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49 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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50 | return ptr;
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51 | }
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52 |
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53 | // Die if we can't resize previously allocated memory. (This returns a pointer
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54 | // to the new memory, which may or may not be the same as the old memory.
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55 | // It'll copy the contents to a new chunk and free the old one if necessary.)
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56 | void* FAST_FUNC xrealloc(void *ptr, size_t size)
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57 | {
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58 | ptr = realloc(ptr, size);
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59 | if (ptr == NULL && size != 0)
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60 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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61 | return ptr;
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62 | }
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63 | #endif /* DMALLOC */
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64 |
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65 | // Die if we can't allocate and zero size bytes of memory.
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66 | void* FAST_FUNC xzalloc(size_t size)
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67 | {
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68 | void *ptr = xmalloc(size);
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69 | memset(ptr, 0, size);
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70 | return ptr;
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71 | }
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72 |
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73 | // Die if we can't copy a string to freshly allocated memory.
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74 | char* FAST_FUNC xstrdup(const char *s)
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75 | {
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76 | char *t;
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77 |
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78 | if (s == NULL)
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79 | return NULL;
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80 |
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81 | t = strdup(s);
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82 |
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83 | if (t == NULL)
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84 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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85 |
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86 | return t;
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87 | }
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88 |
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89 | // Die if we can't allocate n+1 bytes (space for the null terminator) and copy
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90 | // the (possibly truncated to length n) string into it.
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91 | char* FAST_FUNC xstrndup(const char *s, int n)
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92 | {
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93 | int m;
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94 | char *t;
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95 |
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96 | if (ENABLE_DEBUG && s == NULL)
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97 | bb_error_msg_and_die("xstrndup bug");
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98 |
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99 | /* We can just xmalloc(n+1) and strncpy into it, */
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100 | /* but think about xstrndup("abc", 10000) wastage! */
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101 | m = n;
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102 | t = (char*) s;
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103 | while (m) {
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104 | if (!*t) break;
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105 | m--;
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106 | t++;
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107 | }
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108 | n -= m;
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109 | t = xmalloc(n + 1);
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110 | t[n] = '\0';
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111 |
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112 | return memcpy(t, s, n);
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113 | }
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114 |
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115 | void* FAST_FUNC xmemdup(const void *s, int n)
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116 | {
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117 | return memcpy(xmalloc(n), s, n);
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118 | }
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119 |
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120 | // Die if we can't open a file and return a FILE* to it.
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121 | // Notice we haven't got xfread(), This is for use with fscanf() and friends.
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122 | FILE* FAST_FUNC xfopen(const char *path, const char *mode)
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123 | {
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124 | FILE *fp = fopen(path, mode);
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125 | if (fp == NULL)
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126 | bb_perror_msg_and_die("can't open '%s'", path);
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127 | return fp;
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128 | }
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129 |
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130 | // Die if we can't open a file and return a fd.
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131 | int FAST_FUNC xopen3(const char *pathname, int flags, int mode)
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132 | {
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133 | int ret;
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134 |
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135 | ret = open(pathname, flags, mode);
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136 | if (ret < 0) {
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137 | bb_perror_msg_and_die("can't open '%s'", pathname);
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138 | }
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139 | return ret;
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140 | }
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141 |
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142 | // Die if we can't open a file and return a fd.
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143 | int FAST_FUNC xopen(const char *pathname, int flags)
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144 | {
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145 | return xopen3(pathname, flags, 0666);
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146 | }
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147 |
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148 | // Warn if we can't open a file and return a fd.
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149 | int FAST_FUNC open3_or_warn(const char *pathname, int flags, int mode)
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150 | {
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151 | int ret;
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152 |
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153 | ret = open(pathname, flags, mode);
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154 | if (ret < 0) {
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155 | bb_perror_msg("can't open '%s'", pathname);
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156 | }
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157 | return ret;
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158 | }
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159 |
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160 | // Warn if we can't open a file and return a fd.
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161 | int FAST_FUNC open_or_warn(const char *pathname, int flags)
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162 | {
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163 | return open3_or_warn(pathname, flags, 0666);
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164 | }
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165 |
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166 | /* Die if we can't open an existing file readonly with O_NONBLOCK
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167 | * and return the fd.
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168 | * Note that for ioctl O_RDONLY is sufficient.
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169 | */
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170 | int FAST_FUNC xopen_nonblocking(const char *pathname)
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171 | {
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172 | return xopen(pathname, O_RDONLY | O_NONBLOCK);
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173 | }
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174 |
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175 | int FAST_FUNC xopen_as_uid_gid(const char *pathname, int flags, uid_t u, gid_t g)
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176 | {
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177 | int fd;
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178 | uid_t old_euid = geteuid();
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179 | gid_t old_egid = getegid();
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180 |
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181 | xsetegid(g);
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182 | xseteuid(u);
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183 |
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184 | fd = xopen(pathname, flags);
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185 |
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186 | xseteuid(old_euid);
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187 | xsetegid(old_egid);
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188 |
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189 | return fd;
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190 | }
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191 |
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192 | void FAST_FUNC xunlink(const char *pathname)
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193 | {
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194 | if (unlink(pathname))
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195 | bb_perror_msg_and_die("can't remove file '%s'", pathname);
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196 | }
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197 |
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198 | void FAST_FUNC xrename(const char *oldpath, const char *newpath)
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199 | {
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200 | if (rename(oldpath, newpath))
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201 | bb_perror_msg_and_die("can't move '%s' to '%s'", oldpath, newpath);
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202 | }
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203 |
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204 | int FAST_FUNC rename_or_warn(const char *oldpath, const char *newpath)
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205 | {
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206 | int n = rename(oldpath, newpath);
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207 | if (n)
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208 | bb_perror_msg("can't move '%s' to '%s'", oldpath, newpath);
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209 | return n;
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210 | }
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211 |
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212 | void FAST_FUNC xpipe(int filedes[2])
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213 | {
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214 | if (pipe(filedes))
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215 | bb_perror_msg_and_die("can't create pipe");
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216 | }
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217 |
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218 | void FAST_FUNC xdup2(int from, int to)
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219 | {
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220 | if (dup2(from, to) != to)
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221 | bb_perror_msg_and_die("can't duplicate file descriptor");
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222 | }
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223 |
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224 | // "Renumber" opened fd
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225 | void FAST_FUNC xmove_fd(int from, int to)
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226 | {
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227 | if (from == to)
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228 | return;
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229 | xdup2(from, to);
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230 | close(from);
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231 | }
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232 |
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233 | // Die with an error message if we can't write the entire buffer.
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234 | void FAST_FUNC xwrite(int fd, const void *buf, size_t count)
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235 | {
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236 | if (count) {
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237 | ssize_t size = full_write(fd, buf, count);
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238 | if ((size_t)size != count)
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239 | bb_error_msg_and_die("short write");
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240 | }
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241 | }
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242 | void FAST_FUNC xwrite_str(int fd, const char *str)
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243 | {
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244 | xwrite(fd, str, strlen(str));
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245 | }
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246 |
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247 | void FAST_FUNC xclose(int fd)
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248 | {
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249 | if (close(fd))
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250 | bb_perror_msg_and_die("close failed");
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251 | }
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252 |
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253 | // Die with an error message if we can't lseek to the right spot.
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254 | off_t FAST_FUNC xlseek(int fd, off_t offset, int whence)
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255 | {
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256 | off_t off = lseek(fd, offset, whence);
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257 | if (off == (off_t)-1) {
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258 | if (whence == SEEK_SET)
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259 | bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
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260 | bb_perror_msg_and_die("lseek");
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261 | }
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262 | return off;
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263 | }
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264 |
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265 | int FAST_FUNC xmkstemp(char *template)
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266 | {
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267 | int fd = mkstemp(template);
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268 | if (fd < 0)
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269 | bb_perror_msg_and_die("can't create temp file '%s'", template);
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270 | return fd;
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271 | }
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272 |
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273 | // Die with supplied filename if this FILE* has ferror set.
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274 | void FAST_FUNC die_if_ferror(FILE *fp, const char *fn)
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275 | {
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276 | if (ferror(fp)) {
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277 | /* ferror doesn't set useful errno */
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278 | bb_error_msg_and_die("%s: I/O error", fn);
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279 | }
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280 | }
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281 |
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282 | // Die with an error message if stdout has ferror set.
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283 | void FAST_FUNC die_if_ferror_stdout(void)
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284 | {
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285 | die_if_ferror(stdout, bb_msg_standard_output);
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286 | }
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287 |
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288 | int FAST_FUNC fflush_all(void)
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289 | {
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290 | return fflush(NULL);
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291 | }
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292 |
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293 |
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294 | int FAST_FUNC bb_putchar(int ch)
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295 | {
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296 | return putchar(ch);
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297 | }
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298 |
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299 | /* Die with an error message if we can't copy an entire FILE* to stdout,
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300 | * then close that file. */
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301 | void FAST_FUNC xprint_and_close_file(FILE *file)
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302 | {
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303 | fflush_all();
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304 | // copyfd outputs error messages for us.
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305 | if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1)
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306 | xfunc_die();
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307 |
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308 | fclose(file);
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309 | }
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310 |
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311 | // Die with an error message if we can't malloc() enough space and do an
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312 | // sprintf() into that space.
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313 | char* FAST_FUNC xasprintf(const char *format, ...)
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314 | {
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315 | va_list p;
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316 | int r;
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317 | char *string_ptr;
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318 |
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319 | va_start(p, format);
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320 | r = vasprintf(&string_ptr, format, p);
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321 | va_end(p);
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322 |
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323 | if (r < 0)
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324 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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325 | return string_ptr;
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326 | }
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327 |
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328 | void FAST_FUNC xsetenv(const char *key, const char *value)
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329 | {
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330 | if (setenv(key, value, 1))
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331 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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332 | }
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333 |
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334 | /* Handles "VAR=VAL" strings, even those which are part of environ
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335 | * _right now_
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336 | */
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337 | void FAST_FUNC bb_unsetenv(const char *var)
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338 | {
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339 | char *tp = strchr(var, '=');
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340 |
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341 | if (!tp) {
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342 | unsetenv(var);
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343 | return;
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344 | }
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345 |
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346 | /* In case var was putenv'ed, we can't replace '='
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347 | * with NUL and unsetenv(var) - it won't work,
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348 | * env is modified by the replacement, unsetenv
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349 | * sees "VAR" instead of "VAR=VAL" and does not remove it!
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350 | * horror :( */
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351 | tp = xstrndup(var, tp - var);
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352 | unsetenv(tp);
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353 | free(tp);
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354 | }
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355 |
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356 | void FAST_FUNC bb_unsetenv_and_free(char *var)
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357 | {
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358 | bb_unsetenv(var);
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359 | free(var);
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360 | }
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361 |
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362 | // Die with an error message if we can't set gid. (Because resource limits may
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363 | // limit this user to a given number of processes, and if that fills up the
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364 | // setgid() will fail and we'll _still_be_root_, which is bad.)
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365 | void FAST_FUNC xsetgid(gid_t gid)
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366 | {
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367 | if (setgid(gid)) bb_perror_msg_and_die("setgid");
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368 | }
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369 |
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370 | // Die with an error message if we can't set uid. (See xsetgid() for why.)
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371 | void FAST_FUNC xsetuid(uid_t uid)
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372 | {
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373 | if (setuid(uid)) bb_perror_msg_and_die("setuid");
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374 | }
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375 |
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376 | void FAST_FUNC xsetegid(gid_t egid)
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377 | {
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378 | if (setegid(egid)) bb_perror_msg_and_die("setegid");
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379 | }
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380 |
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381 | void FAST_FUNC xseteuid(uid_t euid)
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382 | {
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383 | if (seteuid(euid)) bb_perror_msg_and_die("seteuid");
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384 | }
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385 |
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386 | // Die if we can't chdir to a new path.
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387 | void FAST_FUNC xchdir(const char *path)
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388 | {
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389 | if (chdir(path))
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390 | bb_perror_msg_and_die("can't change directory to '%s'", path);
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391 | }
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392 |
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393 | void FAST_FUNC xfchdir(int fd)
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394 | {
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395 | if (fchdir(fd))
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396 | bb_perror_msg_and_die("fchdir");
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397 | }
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398 |
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399 | void FAST_FUNC xchroot(const char *path)
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400 | {
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401 | if (chroot(path))
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402 | bb_perror_msg_and_die("can't change root directory to '%s'", path);
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403 | xchdir("/");
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404 | }
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405 |
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406 | // Print a warning message if opendir() fails, but don't die.
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407 | DIR* FAST_FUNC warn_opendir(const char *path)
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408 | {
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409 | DIR *dp;
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410 |
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411 | dp = opendir(path);
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412 | if (!dp)
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413 | bb_perror_msg("can't open '%s'", path);
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414 | return dp;
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415 | }
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416 |
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417 | // Die with an error message if opendir() fails.
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418 | DIR* FAST_FUNC xopendir(const char *path)
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419 | {
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420 | DIR *dp;
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421 |
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422 | dp = opendir(path);
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423 | if (!dp)
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424 | bb_perror_msg_and_die("can't open '%s'", path);
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425 | return dp;
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426 | }
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427 |
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428 | // Die with an error message if we can't open a new socket.
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429 | int FAST_FUNC xsocket(int domain, int type, int protocol)
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430 | {
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431 | int r = socket(domain, type, protocol);
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432 |
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433 | if (r < 0) {
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434 | /* Hijack vaguely related config option */
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435 | #if ENABLE_VERBOSE_RESOLUTION_ERRORS
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436 | const char *s = "INET";
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437 | # ifdef AF_PACKET
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438 | if (domain == AF_PACKET) s = "PACKET";
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439 | # endif
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440 | # ifdef AF_NETLINK
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441 | if (domain == AF_NETLINK) s = "NETLINK";
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442 | # endif
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443 | IF_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";)
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444 | bb_perror_msg_and_die("socket(AF_%s,%d,%d)", s, type, protocol);
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445 | #else
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446 | bb_perror_msg_and_die("socket");
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447 | #endif
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448 | }
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449 |
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450 | return r;
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451 | }
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452 |
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453 | // Die with an error message if we can't bind a socket to an address.
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454 | void FAST_FUNC xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
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455 | {
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456 | if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
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457 | }
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458 |
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459 | // Die with an error message if we can't listen for connections on a socket.
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460 | void FAST_FUNC xlisten(int s, int backlog)
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461 | {
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462 | if (listen(s, backlog)) bb_perror_msg_and_die("listen");
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463 | }
|
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464 |
|
---|
465 | /* Die with an error message if sendto failed.
|
---|
466 | * Return bytes sent otherwise */
|
---|
467 | ssize_t FAST_FUNC xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
|
---|
468 | socklen_t tolen)
|
---|
469 | {
|
---|
470 | ssize_t ret = sendto(s, buf, len, 0, to, tolen);
|
---|
471 | if (ret < 0) {
|
---|
472 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
473 | close(s);
|
---|
474 | bb_perror_msg_and_die("sendto");
|
---|
475 | }
|
---|
476 | return ret;
|
---|
477 | }
|
---|
478 |
|
---|
479 | // xstat() - a stat() which dies on failure with meaningful error message
|
---|
480 | void FAST_FUNC xstat(const char *name, struct stat *stat_buf)
|
---|
481 | {
|
---|
482 | if (stat(name, stat_buf))
|
---|
483 | bb_perror_msg_and_die("can't stat '%s'", name);
|
---|
484 | }
|
---|
485 |
|
---|
486 | void FAST_FUNC xfstat(int fd, struct stat *stat_buf, const char *errmsg)
|
---|
487 | {
|
---|
488 | /* errmsg is usually a file name, but not always:
|
---|
489 | * xfstat may be called in a spot where file name is no longer
|
---|
490 | * available, and caller may give e.g. "can't stat input file" string.
|
---|
491 | */
|
---|
492 | if (fstat(fd, stat_buf))
|
---|
493 | bb_simple_perror_msg_and_die(errmsg);
|
---|
494 | }
|
---|
495 |
|
---|
496 | // selinux_or_die() - die if SELinux is disabled.
|
---|
497 | void FAST_FUNC selinux_or_die(void)
|
---|
498 | {
|
---|
499 | #if ENABLE_SELINUX
|
---|
500 | int rc = is_selinux_enabled();
|
---|
501 | if (rc == 0) {
|
---|
502 | bb_error_msg_and_die("SELinux is disabled");
|
---|
503 | } else if (rc < 0) {
|
---|
504 | bb_error_msg_and_die("is_selinux_enabled() failed");
|
---|
505 | }
|
---|
506 | #else
|
---|
507 | bb_error_msg_and_die("SELinux support is disabled");
|
---|
508 | #endif
|
---|
509 | }
|
---|
510 |
|
---|
511 | int FAST_FUNC ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...)
|
---|
512 | {
|
---|
513 | int ret;
|
---|
514 | va_list p;
|
---|
515 |
|
---|
516 | ret = ioctl(fd, request, argp);
|
---|
517 | if (ret < 0) {
|
---|
518 | va_start(p, fmt);
|
---|
519 | bb_verror_msg(fmt, p, strerror(errno));
|
---|
520 | /* xfunc_die can actually longjmp, so be nice */
|
---|
521 | va_end(p);
|
---|
522 | xfunc_die();
|
---|
523 | }
|
---|
524 | return ret;
|
---|
525 | }
|
---|
526 |
|
---|
527 | int FAST_FUNC ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...)
|
---|
528 | {
|
---|
529 | va_list p;
|
---|
530 | int ret = ioctl(fd, request, argp);
|
---|
531 |
|
---|
532 | if (ret < 0) {
|
---|
533 | va_start(p, fmt);
|
---|
534 | bb_verror_msg(fmt, p, strerror(errno));
|
---|
535 | va_end(p);
|
---|
536 | }
|
---|
537 | return ret;
|
---|
538 | }
|
---|
539 |
|
---|
540 | #if ENABLE_IOCTL_HEX2STR_ERROR
|
---|
541 | int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name)
|
---|
542 | {
|
---|
543 | int ret;
|
---|
544 |
|
---|
545 | ret = ioctl(fd, request, argp);
|
---|
546 | if (ret < 0)
|
---|
547 | bb_simple_perror_msg(ioctl_name);
|
---|
548 | return ret;
|
---|
549 | }
|
---|
550 | int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name)
|
---|
551 | {
|
---|
552 | int ret;
|
---|
553 |
|
---|
554 | ret = ioctl(fd, request, argp);
|
---|
555 | if (ret < 0)
|
---|
556 | bb_simple_perror_msg_and_die(ioctl_name);
|
---|
557 | return ret;
|
---|
558 | }
|
---|
559 | #else
|
---|
560 | int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp)
|
---|
561 | {
|
---|
562 | int ret;
|
---|
563 |
|
---|
564 | ret = ioctl(fd, request, argp);
|
---|
565 | if (ret < 0)
|
---|
566 | bb_perror_msg("ioctl %#x failed", request);
|
---|
567 | return ret;
|
---|
568 | }
|
---|
569 | int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp)
|
---|
570 | {
|
---|
571 | int ret;
|
---|
572 |
|
---|
573 | ret = ioctl(fd, request, argp);
|
---|
574 | if (ret < 0)
|
---|
575 | bb_perror_msg_and_die("ioctl %#x failed", request);
|
---|
576 | return ret;
|
---|
577 | }
|
---|
578 | #endif
|
---|
579 |
|
---|
580 | char* FAST_FUNC xmalloc_ttyname(int fd)
|
---|
581 | {
|
---|
582 | char buf[128];
|
---|
583 | int r = ttyname_r(fd, buf, sizeof(buf) - 1);
|
---|
584 | if (r)
|
---|
585 | return NULL;
|
---|
586 | return xstrdup(buf);
|
---|
587 | }
|
---|
588 |
|
---|
589 | void FAST_FUNC generate_uuid(uint8_t *buf)
|
---|
590 | {
|
---|
591 | /* http://www.ietf.org/rfc/rfc4122.txt
|
---|
592 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
---|
593 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
---|
594 | * | time_low |
|
---|
595 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
---|
596 | * | time_mid | time_hi_and_version |
|
---|
597 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
---|
598 | * |clk_seq_and_variant | node (0-1) |
|
---|
599 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
---|
600 | * | node (2-5) |
|
---|
601 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
---|
602 | * IOW, uuid has this layout:
|
---|
603 | * uint32_t time_low (big endian)
|
---|
604 | * uint16_t time_mid (big endian)
|
---|
605 | * uint16_t time_hi_and_version (big endian)
|
---|
606 | * version is a 4-bit field:
|
---|
607 | * 1 Time-based
|
---|
608 | * 2 DCE Security, with embedded POSIX UIDs
|
---|
609 | * 3 Name-based (MD5)
|
---|
610 | * 4 Randomly generated
|
---|
611 | * 5 Name-based (SHA-1)
|
---|
612 | * uint16_t clk_seq_and_variant (big endian)
|
---|
613 | * variant is a 3-bit field:
|
---|
614 | * 0xx Reserved, NCS backward compatibility
|
---|
615 | * 10x The variant specified in rfc4122
|
---|
616 | * 110 Reserved, Microsoft backward compatibility
|
---|
617 | * 111 Reserved for future definition
|
---|
618 | * uint8_t node[6]
|
---|
619 | *
|
---|
620 | * For version 4, these bits are set/cleared:
|
---|
621 | * time_hi_and_version & 0x0fff | 0x4000
|
---|
622 | * clk_seq_and_variant & 0x3fff | 0x8000
|
---|
623 | */
|
---|
624 | pid_t pid;
|
---|
625 | int i;
|
---|
626 |
|
---|
627 | i = open("/dev/urandom", O_RDONLY);
|
---|
628 | if (i >= 0) {
|
---|
629 | read(i, buf, 16);
|
---|
630 | close(i);
|
---|
631 | }
|
---|
632 | /* Paranoia. /dev/urandom may be missing.
|
---|
633 | * rand() is guaranteed to generate at least [0, 2^15) range,
|
---|
634 | * but lowest bits in some libc are not so "random". */
|
---|
635 | srand(monotonic_us()); /* pulls in printf */
|
---|
636 | pid = getpid();
|
---|
637 | while (1) {
|
---|
638 | for (i = 0; i < 16; i++)
|
---|
639 | buf[i] ^= rand() >> 5;
|
---|
640 | if (pid == 0)
|
---|
641 | break;
|
---|
642 | srand(pid);
|
---|
643 | pid = 0;
|
---|
644 | }
|
---|
645 |
|
---|
646 | /* version = 4 */
|
---|
647 | buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
|
---|
648 | /* variant = 10x */
|
---|
649 | buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
|
---|
650 | }
|
---|
651 |
|
---|
652 | #if BB_MMU
|
---|
653 | pid_t FAST_FUNC xfork(void)
|
---|
654 | {
|
---|
655 | pid_t pid;
|
---|
656 | pid = fork();
|
---|
657 | if (pid < 0) /* wtf? */
|
---|
658 | bb_perror_msg_and_die("vfork"+1);
|
---|
659 | return pid;
|
---|
660 | }
|
---|
661 | #endif
|
---|
662 |
|
---|
663 | void FAST_FUNC xvfork_parent_waits_and_exits(void)
|
---|
664 | {
|
---|
665 | pid_t pid;
|
---|
666 |
|
---|
667 | fflush_all();
|
---|
668 | pid = xvfork();
|
---|
669 | if (pid > 0) {
|
---|
670 | /* Parent */
|
---|
671 | int exit_status = wait_for_exitstatus(pid);
|
---|
672 | if (WIFSIGNALED(exit_status))
|
---|
673 | kill_myself_with_sig(WTERMSIG(exit_status));
|
---|
674 | _exit(WEXITSTATUS(exit_status));
|
---|
675 | }
|
---|
676 | /* Child continues */
|
---|
677 | }
|
---|