Mercurial > crates > nonstick
annotate libpam-sys/libpam-sys-helpers/src/memory.rs @ 141:a508a69c068a
Remove a lot of Results from functions.
Many functions are documented to only return failing Results when given
improper inputs or when there is a memory allocation failure (which
can be verified by looking at the source). In cases where we know our
input is correct, we don't need to check for memory allocation errors
for the same reason that Rust doesn't do so when you, e.g., create a
new Vec.
author | Paul Fisher <paul@pfish.zone> |
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date | Sat, 05 Jul 2025 17:16:56 -0400 |
parents | add7228adb2f |
children | ebb71a412b58 |
rev | line source |
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136
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1 //! Helpers to deal with annoying memory management in the PAM API. |
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2 |
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3 use std::error::Error; |
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4 use std::marker::{PhantomData, PhantomPinned}; |
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5 use std::mem::ManuallyDrop; |
109 | 6 use std::ptr::NonNull; |
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7 use std::{any, fmt, mem, ptr, slice}; |
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8 |
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9 /// A pointer-to-pointer-to-message container for PAM's conversation callback. |
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10 /// |
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11 /// The PAM conversation callback requires a pointer to a pointer of |
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12 /// `pam_message`s. Linux-PAM handles this differently than all other |
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13 /// PAM implementations (including the X/SSO PAM standard). |
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14 /// |
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15 /// X/SSO appears to specify a pointer-to-pointer-to-array: |
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16 /// |
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17 /// ```text |
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18 /// points to ┌────────────┐ ╔═ Message[] ═╗ |
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19 /// messages ┄┄┄┄┄┄┄┄┄┄> │ *messages ┄┼┄┄┄┄┄> ║ style ║ |
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20 /// └────────────┘ ║ data ┄┄┄┄┄┄┄╫┄┄> ... |
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21 /// ╟─────────────╢ |
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22 /// ║ style ║ |
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23 /// ║ data ┄┄┄┄┄┄┄╫┄┄> ... |
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24 /// ╟─────────────╢ |
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25 /// ║ ... ║ |
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26 /// ``` |
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27 /// |
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28 /// whereas Linux-PAM uses an `**argv`-style pointer-to-array-of-pointers: |
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29 /// |
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30 /// ```text |
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31 /// points to ┌──────────────┐ ╔═ Message ═╗ |
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32 /// messages ┄┄┄┄┄┄┄┄┄┄> │ messages[0] ┄┼┄┄┄┄> ║ style ║ |
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33 /// │ messages[1] ┄┼┄┄┄╮ ║ data ┄┄┄┄┄╫┄┄> ... |
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34 /// │ ... │ ┆ ╚═══════════╝ |
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35 /// ┆ |
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36 /// ┆ ╔═ Message ═╗ |
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37 /// ╰┄┄> ║ style ║ |
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38 /// ║ data ┄┄┄┄┄╫┄┄> ... |
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39 /// ╚═══════════╝ |
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40 /// ``` |
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41 /// |
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42 /// Because the `messages` remain owned by the application which calls into PAM, |
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43 /// we can solve this with One Simple Trick: make the intermediate list point |
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44 /// into the same array: |
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45 /// |
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46 /// ```text |
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47 /// points to ┌──────────────┐ ╔═ Message[] ═╗ |
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48 /// messages ┄┄┄┄┄┄┄┄┄┄> │ messages[0] ┄┼┄┄┄┄> ║ style ║ |
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49 /// │ messages[1] ┄┼┄┄╮ ║ data ┄┄┄┄┄┄┄╫┄┄> ... |
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50 /// │ ... │ ┆ ╟─────────────╢ |
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51 /// ╰┄> ║ style ║ |
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52 /// ║ data ┄┄┄┄┄┄┄╫┄┄> ... |
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53 /// ╟─────────────╢ |
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54 /// ║ ... ║ |
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55 /// |
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56 /// ``` |
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57 #[derive(Debug)] |
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58 pub struct PtrPtrVec<T> { |
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59 data: Vec<T>, |
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60 pointers: Vec<*const T>, |
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61 } |
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62 |
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63 // Since this is a wrapper around a Vec with no dangerous functionality*, |
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64 // this can be Send and Sync provided the original Vec is. |
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65 // |
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66 // * It will only become unsafe when the user dereferences a pointer or sends it |
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67 // to an unsafe function. |
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68 unsafe impl<T> Send for PtrPtrVec<T> where Vec<T>: Send {} |
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69 unsafe impl<T> Sync for PtrPtrVec<T> where Vec<T>: Sync {} |
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70 |
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71 impl<T> PtrPtrVec<T> { |
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72 /// Takes ownership of the given Vec and creates a vec of pointers to it. |
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73 pub fn new(data: Vec<T>) -> Self { |
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74 let start = data.as_ptr(); |
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75 // We do this slightly tricky little dance to satisfy Miri: |
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76 // |
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77 // A pointer extracted from a reference can only legally access |
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78 // that reference's memory. This means that if we say: |
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79 // pointers[0] = &data[0] as *const T; |
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80 // we can't traverse through pointers[0] to reach data[1], |
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81 // we can only use pointers[1]. |
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82 // |
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83 // However, if we use the start-of-vec pointer from the `data` vector, |
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84 // its "provenance"* is valid for the entire array (even if the address |
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85 // of the pointer is the same). This avoids some behavior which is |
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86 // technically undefined. While the CPU sees no difference between |
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87 // those two pointers, the compiler is allowed to make optimizations |
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88 // based on that provenance (even if, in this case, it isn't likely |
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89 // to do so). |
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90 // |
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91 // data.as_ptr() points here, and is valid for the whole Vec. |
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92 // ┃ |
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93 // ┠─────────────────╮ |
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94 // ┌─────┬─────┬─────┐ |
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95 // data │ [0] │ [1] │ [2] │ |
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96 // └─────┴─────┴─────┘ |
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97 // ┠─────╯ ┊ |
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98 // ┃ ┊ ┊ |
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99 // (&data[0] as *const T) points to the same place, but is valid |
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100 // only for that 0th element. |
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101 // ┊ ┊ |
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102 // ┠─────╯ |
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103 // ┃ |
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104 // (&data[1] as *const T) points here, and is only valid |
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105 // for that element. |
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106 // |
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107 // We only have to do this for pointers[0] because only that pointer |
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108 // is used for accessing elements other than data[0] (in XSSO). |
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109 // |
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110 // * "provenance" is kind of like if every pointer in your program |
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111 // remembered where it came from and, based on that, it had an implied |
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112 // memory range it was valid for, separate from its address. |
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113 // https://doc.rust-lang.org/std/ptr/#provenance |
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114 // (It took a long time for me to understand this.) |
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115 let mut pointers = Vec::with_capacity(data.len()); |
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116 // Ensure the 0th pointer has provenance from the entire vec |
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117 // (even though it's numerically identical to &data[0] as *const T). |
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118 pointers.push(start); |
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119 // The 1st and everything thereafter only need to have the provenance |
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120 // of their own memory. |
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121 pointers.extend(data[1..].iter().map(|r| r as *const T)); |
119
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122 Self { data, pointers } |
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123 } |
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124 |
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125 /// Gives you back your Vec. |
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126 pub fn into_inner(self) -> Vec<T> { |
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127 self.data |
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128 } |
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129 |
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130 /// Gets a pointer-to-pointer suitable for passing into the Conversation. |
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131 pub fn as_ptr<Dest>(&self) -> *const *const Dest { |
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132 Self::assert_size::<Dest>(); |
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133 self.pointers.as_ptr().cast::<*const Dest>() |
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134 } |
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135 |
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136 /// Iterates over a Linux-PAM–style pointer-to-array-of-pointers. |
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137 /// |
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138 /// # Safety |
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139 /// |
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140 /// `ptr_ptr` must be a valid pointer to an array of pointers, |
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141 /// there must be at least `count` valid pointers in the array, |
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142 /// and each pointer in that array must point to a valid `T`. |
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143 #[deprecated = "use [`Self::iter_over`] instead, unless you really need this specific version"] |
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144 #[allow(dead_code)] |
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145 pub unsafe fn iter_over_linux<'a, Src>( |
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146 ptr_ptr: *const *const Src, |
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147 count: usize, |
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148 ) -> impl Iterator<Item = &'a T> |
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149 where |
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150 T: 'a, |
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151 { |
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152 Self::assert_size::<Src>(); |
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153 slice::from_raw_parts(ptr_ptr.cast::<&T>(), count) |
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154 .iter() |
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155 .copied() |
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156 } |
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157 |
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158 /// Iterates over an X/SSO–style pointer-to-pointer-to-array. |
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159 /// |
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160 /// # Safety |
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161 /// |
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162 /// You must pass a valid pointer to a valid pointer to an array, |
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163 /// there must be at least `count` elements in the array, |
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164 /// and each value in that array must be a valid `T`. |
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165 #[deprecated = "use [`Self::iter_over`] instead, unless you really need this specific version"] |
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166 #[allow(dead_code)] |
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167 pub unsafe fn iter_over_xsso<'a, Src>( |
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168 ptr_ptr: *const *const Src, |
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169 count: usize, |
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170 ) -> impl Iterator<Item = &'a T> |
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171 where |
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172 T: 'a, |
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173 { |
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174 Self::assert_size::<Src>(); |
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175 slice::from_raw_parts(*ptr_ptr.cast(), count).iter() |
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176 } |
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177 |
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178 /// Iterates over a PAM message list appropriate to your system's impl. |
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179 /// |
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180 /// This selects the correct pointer/array structure to use for a message |
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181 /// that was given to you by your system. |
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182 /// |
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183 /// # Safety |
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184 /// |
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185 /// `ptr_ptr` must point to a valid message list, there must be at least |
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186 /// `count` messages in the list, and all messages must be a valid `Src`. |
134
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187 #[allow(deprecated)] |
119
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188 pub unsafe fn iter_over<'a, Src>( |
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189 ptr_ptr: *const *const Src, |
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190 count: usize, |
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191 ) -> impl Iterator<Item = &'a T> |
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192 where |
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193 T: 'a, |
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194 { |
134
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195 #[cfg(pam_impl = "LinuxPam")] |
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196 return Self::iter_over_linux(ptr_ptr, count); |
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197 #[cfg(not(pam_impl = "LinuxPam"))] |
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198 return Self::iter_over_xsso(ptr_ptr, count); |
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199 } |
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200 |
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201 fn assert_size<That>() { |
140
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202 assert_eq!( |
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203 mem::size_of::<T>(), |
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204 mem::size_of::<That>(), |
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205 "type {t} is not the size of {that}", |
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206 t = any::type_name::<T>(), |
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207 that = any::type_name::<That>(), |
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208 ); |
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209 } |
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210 } |
106
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211 |
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212 /// Error returned when attempting to allocate a buffer that is too big. |
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213 /// |
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214 /// This is specifically used in [`OwnedBinaryPayload`] when you try to allocate |
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215 /// a message larger than 2<sup>32</sup> bytes. |
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216 #[derive(Debug, PartialEq)] |
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217 pub struct TooBigError { |
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218 pub size: usize, |
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219 pub max: usize, |
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220 } |
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221 |
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222 impl Error for TooBigError {} |
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223 |
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224 impl fmt::Display for TooBigError { |
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225 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
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226 write!( |
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227 f, |
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228 "can't allocate a message of {size} bytes (max {max})", |
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229 size = self.size, |
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230 max = self.max |
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231 ) |
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232 } |
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233 } |
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234 |
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235 /// A trait wrapping memory management. |
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236 /// |
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237 /// This is intended to allow you to bring your own allocator for |
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238 /// [`OwnedBinaryPayload`]s. |
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239 /// |
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240 /// For an implementation example, see the implementation of this trait |
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241 /// for [`Vec`]. |
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242 #[allow(clippy::wrong_self_convention)] |
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243 pub trait Buffer { |
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244 /// Allocates a buffer of `len` elements, filled with the default. |
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245 fn allocate(len: usize) -> Self; |
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246 |
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247 fn as_ptr(this: &Self) -> *const u8; |
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248 |
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249 /// Returns a slice view of `size` elements of the given memory. |
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250 /// |
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251 /// # Safety |
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252 /// |
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253 /// The caller must not request more elements than are allocated. |
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254 unsafe fn as_mut_slice(this: &mut Self, len: usize) -> &mut [u8]; |
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255 |
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256 /// Consumes this ownership and returns a pointer to the start of the arena. |
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257 fn into_ptr(this: Self) -> NonNull<u8>; |
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258 |
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259 /// "Adopts" the memory at the given pointer, taking it under management. |
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260 /// |
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261 /// Running the operation: |
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262 /// |
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263 /// ``` |
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264 /// # use libpam_sys_helpers::memory::Buffer; |
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265 /// # fn test<T: Default, OwnerType: Buffer>(bytes: usize) { |
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266 /// let owner = OwnerType::allocate(bytes); |
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267 /// let ptr = OwnerType::into_ptr(owner); |
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268 /// let owner = unsafe { OwnerType::from_ptr(ptr, bytes) }; |
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269 /// # } |
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270 /// ``` |
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271 /// |
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272 /// must be a no-op. |
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273 /// |
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274 /// # Safety |
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275 /// |
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276 /// The pointer must be valid, and the caller must provide the exact size |
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277 /// of the given arena. |
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278 unsafe fn from_ptr(ptr: NonNull<u8>, bytes: usize) -> Self; |
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279 } |
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280 |
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281 impl Buffer for Vec<u8> { |
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282 fn allocate(bytes: usize) -> Self { |
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283 vec![0; bytes] |
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284 } |
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285 |
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286 fn as_ptr(this: &Self) -> *const u8 { |
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287 Vec::as_ptr(this) |
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288 } |
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289 |
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290 unsafe fn as_mut_slice(this: &mut Self, bytes: usize) -> &mut [u8] { |
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291 &mut this[..bytes] |
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292 } |
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293 |
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294 fn into_ptr(this: Self) -> NonNull<u8> { |
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295 let mut me = ManuallyDrop::new(this); |
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296 // SAFETY: a Vec is guaranteed to have a nonzero pointer. |
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297 unsafe { NonNull::new_unchecked(me.as_mut_ptr()) } |
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298 } |
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299 |
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300 unsafe fn from_ptr(ptr: NonNull<u8>, bytes: usize) -> Self { |
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301 Vec::from_raw_parts(ptr.as_ptr(), bytes, bytes) |
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302 } |
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303 } |
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304 |
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305 /// The structure of the "binary message" payload for the `PAM_BINARY_PROMPT` |
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306 /// extension from Linux-PAM. |
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307 pub struct BinaryPayload { |
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308 /// The total byte size of the message, including this header, |
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309 /// as u32 in network byte order (big endian). |
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310 pub total_bytes_u32be: [u8; 4], |
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311 /// A tag used to provide some kind of hint as to what the data is. |
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312 /// Its meaning is undefined. |
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313 pub data_type: u8, |
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314 /// Where the data itself would start, used as a marker to make this |
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315 /// not [`Unpin`] (since it is effectively an intrusive data structure |
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316 /// pointing to immediately after itself). |
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317 pub _marker: PhantomData<PhantomPinned>, |
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318 } |
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319 |
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320 impl BinaryPayload { |
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321 /// The most data it's possible to put into a [`BinaryPayload`]. |
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322 pub const MAX_SIZE: usize = (u32::MAX - 5) as usize; |
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323 |
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324 /// Fills in the provided buffer with the given data. |
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325 /// |
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326 /// This uses [`copy_from_slice`](slice::copy_from_slice) internally, |
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327 /// so `buf` must be exactly 5 bytes longer than `data`, or this function |
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328 /// will panic. |
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329 pub fn fill(buf: &mut [u8], data: &[u8], data_type: u8) { |
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330 let ptr: *mut Self = buf.as_mut_ptr().cast(); |
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331 // SAFETY: We're given a slice, which always has a nonzero pointer. |
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332 let me = unsafe { ptr.as_mut().unwrap_unchecked() }; |
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333 me.total_bytes_u32be = u32::to_be_bytes(buf.len() as u32); |
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334 me.data_type = data_type; |
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335 buf[5..].copy_from_slice(data) |
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336 } |
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337 |
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338 /// The total storage needed for the message, including header. |
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339 pub unsafe fn total_bytes(this: *const Self) -> usize { |
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340 let header = this.as_ref().unwrap_unchecked(); |
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341 u32::from_be_bytes(header.total_bytes_u32be) as usize |
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342 } |
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343 |
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344 /// Gets the total byte buffer of the BinaryMessage stored at the pointer. |
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345 /// |
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346 /// The returned data slice is borrowed from where the pointer points to. |
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347 /// |
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348 /// # Safety |
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349 /// |
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350 /// - The pointer must point to a valid `BinaryPayload`. |
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351 /// - The borrowed data must not outlive the pointer's validity. |
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352 pub unsafe fn buffer_of<'a>(ptr: *const Self) -> &'a [u8] { |
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353 slice::from_raw_parts(ptr.cast(), Self::total_bytes(ptr).max(5)) |
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354 } |
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355 |
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356 /// Gets the contents of the BinaryMessage stored at the given pointer. |
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357 /// |
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358 /// The returned data slice is borrowed from where the pointer points to. |
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359 /// This is a cheap operation and doesn't do *any* copying. |
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360 /// |
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361 /// We don't take a `&self` reference here because accessing beyond |
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362 /// the range of the `Self` data (i.e., beyond the 5 bytes of `self`) |
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363 /// is undefined behavior. Instead, you have to pass a raw pointer |
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364 /// directly to the data. |
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365 /// |
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366 /// # Safety |
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367 /// |
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368 /// - The pointer must point to a valid `BinaryPayload`. |
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369 /// - The borrowed data must not outlive the pointer's validity. |
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370 pub unsafe fn contents<'a>(ptr: *const Self) -> (&'a [u8], u8) { |
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371 let header: &Self = ptr.as_ref().unwrap_unchecked(); |
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372 (&Self::buffer_of(ptr)[5..], header.data_type) |
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373 } |
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374 |
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375 /// Zeroes out the data of this payload. |
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376 /// |
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377 /// # Safety |
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378 /// |
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379 /// - The pointer must point to a valid `BinaryPayload`. |
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380 /// - The binary payload must not be used in the future, |
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381 /// since its length metadata is gone and so its buffer is unknown. |
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382 pub unsafe fn zero(ptr: *mut Self) { |
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383 let size = Self::total_bytes(ptr); |
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384 let ptr: *mut u8 = ptr.cast(); |
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385 for x in 0..size { |
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386 ptr::write_volatile(ptr.byte_add(x), mem::zeroed()) |
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387 } |
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388 } |
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389 } |
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390 |
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391 /// A binary message owned by some storage. |
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392 /// |
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393 /// This is an owned, memory-managed version of [`BinaryPayload`]. |
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394 /// The `O` type manages the memory where the payload lives. |
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395 /// [`Vec<u8>`] is one such manager and can be used when ownership |
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396 /// of the data does not need to transit through PAM. |
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397 #[derive(Debug)] |
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398 pub struct OwnedBinaryPayload<Owner: Buffer>(Owner); |
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399 |
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400 impl<O: Buffer> OwnedBinaryPayload<O> { |
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401 /// Allocates a new OwnedBinaryPayload. |
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402 /// |
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403 /// This will return a [`TooBigError`] if you try to allocate too much |
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404 /// (more than [`BinaryPayload::MAX_SIZE`]). |
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405 pub fn new(data: &[u8], type_: u8) -> Result<Self, TooBigError> { |
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406 let total_len: u32 = (data.len() + 5).try_into().map_err(|_| TooBigError { |
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407 size: data.len(), |
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408 max: BinaryPayload::MAX_SIZE, |
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409 })?; |
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410 let total_len = total_len as usize; |
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411 let mut buf = O::allocate(total_len); |
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412 // SAFETY: We just allocated this exact size. |
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413 BinaryPayload::fill( |
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414 unsafe { Buffer::as_mut_slice(&mut buf, total_len) }, |
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415 data, |
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416 type_, |
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417 ); |
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418 Ok(Self(buf)) |
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419 } |
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420 |
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421 /// The contents of the buffer. |
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422 pub fn contents(&self) -> (&[u8], u8) { |
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423 unsafe { BinaryPayload::contents(self.as_ptr()) } |
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424 } |
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425 |
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426 /// The total bytes needed to store this, including the header. |
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427 pub fn total_bytes(&self) -> usize { |
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428 unsafe { BinaryPayload::buffer_of(Buffer::as_ptr(&self.0).cast()).len() } |
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429 } |
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430 |
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431 /// Unwraps this into the raw storage backing it. |
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432 pub fn into_inner(self) -> O { |
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433 self.0 |
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434 } |
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435 |
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436 /// Gets a const pointer to the start of the message's buffer. |
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437 pub fn as_ptr(&self) -> *const BinaryPayload { |
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438 Buffer::as_ptr(&self.0).cast() |
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439 } |
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440 |
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441 /// Consumes ownership of this message and converts it to a raw pointer |
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442 /// to the start of the message. |
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443 /// |
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444 /// To clean this up, you should eventually pass it into [`Self::from_ptr`] |
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445 /// with the same `O` ownership type. |
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446 pub fn into_ptr(self) -> NonNull<BinaryPayload> { |
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447 Buffer::into_ptr(self.0).cast() |
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448 } |
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449 |
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450 /// Takes ownership of the given pointer. |
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451 /// |
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452 /// # Safety |
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453 /// |
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454 /// You must provide a valid pointer, allocated by (or equivalent to one |
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455 /// allocated by) [`Self::new`]. For instance, passing a pointer allocated |
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456 /// by `malloc` to `OwnedBinaryPayload::<Vec<u8>>::from_ptr` is not allowed. |
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457 pub unsafe fn from_ptr(ptr: NonNull<BinaryPayload>) -> Self { |
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458 Self(O::from_ptr(ptr.cast(), BinaryPayload::total_bytes(ptr.as_ptr()))) |
106
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459 } |
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460 } |
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461 |
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462 #[cfg(test)] |
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463 mod tests { |
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464 use super::*; |
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465 use std::ptr; |
106
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466 |
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467 type VecPayload = OwnedBinaryPayload<Vec<u8>>; |
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468 |
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469 #[test] |
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470 fn test_binary_payload() { |
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471 let simple_message = &[0u8, 0, 0, 16, 0xff, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; |
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472 let empty = &[0u8; 5]; |
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473 |
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474 assert_eq!((&[0u8, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10][..], 0xff), unsafe { |
106
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475 BinaryPayload::contents(simple_message.as_ptr().cast()) |
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476 }); |
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477 assert_eq!((&[][..], 0x00), unsafe { |
106
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478 BinaryPayload::contents(empty.as_ptr().cast()) |
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479 }); |
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480 } |
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481 |
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482 #[test] |
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483 fn test_owned_binary_payload() { |
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484 let (data, typ) = ( |
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485 &[0, 1, 1, 8, 9, 9, 9, 8, 8, 1, 9, 9, 9, 1, 1, 9, 7, 2, 5, 3][..], |
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486 112, |
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487 ); |
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488 let payload = VecPayload::new(data, typ).unwrap(); |
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489 assert_eq!((data, typ), payload.contents()); |
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490 let ptr = payload.into_ptr(); |
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491 let payload = unsafe { VecPayload::from_ptr(ptr) }; |
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492 assert_eq!((data, typ), payload.contents()); |
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493 } |
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494 |
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495 #[test] |
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496 #[ignore] |
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497 fn test_owned_too_big() { |
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498 let data = vec![0xFFu8; 0x1_0000_0001]; |
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499 assert_eq!( |
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500 TooBigError { |
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501 max: 0xffff_fffa, |
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502 size: 0x1_0000_0001 |
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503 }, |
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504 VecPayload::new(&data, 5).unwrap_err() |
106
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505 ) |
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506 } |
119
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507 |
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508 #[cfg(debug_assertions)] |
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509 #[test] |
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510 #[should_panic] |
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511 fn test_new_wrong_size() { |
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512 let bad_vec = vec![0; 19]; |
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513 let msg = PtrPtrVec::new(bad_vec); |
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514 let _ = msg.as_ptr::<u64>(); |
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515 } |
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516 |
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517 #[allow(deprecated)] |
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518 #[test] |
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519 #[should_panic] |
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520 fn test_iter_xsso_wrong_size() { |
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521 unsafe { |
127 | 522 let _ = PtrPtrVec::<u8>::iter_over_xsso::<f64>(ptr::null(), 1); |
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523 } |
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524 } |
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525 |
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526 #[allow(deprecated)] |
119
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527 #[test] |
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528 #[should_panic] |
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529 fn test_iter_linux_wrong_size() { |
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530 unsafe { |
127 | 531 let _ = PtrPtrVec::<u128>::iter_over_linux::<()>(ptr::null(), 1); |
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532 } |
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533 } |
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534 |
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535 #[allow(deprecated)] |
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536 #[test] |
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537 fn test_right_size() { |
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538 let good_vec = vec![(1u64, 2u64), (3, 4), (5, 6)]; |
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539 let ptr = good_vec.as_ptr(); |
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540 let msg = PtrPtrVec::new(good_vec); |
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541 let msg_ref: *const *const (i64, i64) = msg.as_ptr(); |
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542 assert_eq!(unsafe { *msg_ref }, ptr.cast()); |
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543 |
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544 let linux_result: Vec<(i64, i64)> = unsafe { PtrPtrVec::iter_over_linux(msg_ref, 3) } |
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545 .cloned() |
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546 .collect(); |
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547 let xsso_result: Vec<(i64, i64)> = unsafe { PtrPtrVec::iter_over_xsso(msg_ref, 3) } |
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548 .cloned() |
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549 .collect(); |
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550 assert_eq!(vec![(1, 2), (3, 4), (5, 6)], linux_result); |
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551 assert_eq!(vec![(1, 2), (3, 4), (5, 6)], xsso_result); |
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552 drop(msg) |
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553 } |
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554 |
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555 #[allow(deprecated)] |
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556 #[test] |
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557 fn test_iter_ptr_ptr() { |
140
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558 // These boxes are larger than a single pointer because we want to |
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559 // make sure they're not accidentally allocated adjacently |
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560 // in such a way that it's compatible with X/SSO. |
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561 // |
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562 // a pointer to (&str, i32) can be treated as a pointer to (&str). |
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563 #[repr(C)] |
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564 struct pair(&'static str, i32); |
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565 let boxes = vec![ |
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566 Box::new(pair("a", 1)), |
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567 Box::new(pair("b", 2)), |
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568 Box::new(pair("c", 3)), |
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569 Box::new(pair("D", 4)), |
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570 ]; |
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571 let ptr: *const *const &str = boxes.as_ptr().cast(); |
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572 let got: Vec<&str> = unsafe { PtrPtrVec::iter_over_linux(ptr, 4) } |
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573 .cloned() |
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574 .collect(); |
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575 assert_eq!(vec!["a", "b", "c", "D"], got); |
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576 |
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577 // On the other hand, we explicitly want these to be adjacent. |
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578 let nums = [-1i8, 2, 3]; |
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579 let ptr = nums.as_ptr(); |
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580 let got: Vec<u8> = unsafe { PtrPtrVec::iter_over_xsso(&ptr, 3) } |
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581 .cloned() |
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582 .collect(); |
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583 assert_eq!(vec![255, 2, 3], got); |
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584 } |
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585 } |