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Test cases of dup3() for radix tree__alloc_fd

I have written dup3() test case.
I am going to run this test case for the close_on_exec patch.
Also, I have written one program (child_process.c) which will run on exec and try to open the file using fdopen().

dup3() test case is given below,

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147/** This is dup3() functionality testcase.* The dup3() is duplicate a file descriptor to a given number, * with flags.*/#include <stdio.h>#include <unistd.h>…