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Difference between passing array and array pointer into function in C
... type derivation, then for each call to the function, the value of the corresponding
actual argument shall provide access to the first element of an array with at least as many
elements as specified by the size expression.
So, in short, any function parameter declared as T a[] or T a[N] is treated...
How does this milw0rm heap spraying exploit work?
...EA8331FC0B6A6A jmp 0x6a6a:0xbfc3183
00000017 03D4 add edx,esp
00000019 07 pop es
0000001A 67305CFF xor [si-0x1],bl
0000001E 98 cwde
0000001F BBD7FFA4FE mov ebx,0xfea4ffd7
00000024 9B wait
00000025 74AD j...
Is volatile expensive?
...R-133 Cookbook for Compiler Writers about the implementation of volatile, especially section "Interactions with Atomic Instructions" I assume that reading a volatile variable without updating it needs a LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad and LoadStore are eff...
GDB corrupted stack frame - How to debug?
...ff the stack. In 32-bit x86 code you just do:
(gdb) set $pc = *(void **)$esp
(gdb) set $esp = $esp + 4
With 64-bit x86 code you need
(gdb) set $pc = *(void **)$rsp
(gdb) set $rsp = $rsp + 8
Then, you should be able to do a bt and figure out where the code really is.
The other 1% of the time,...
Do sealed classes really offer performance Benefits?
... = new NormalClass();
00000000 push ebp
00000001 mov ebp,esp
00000003 sub esp,8
00000006 cmp dword ptr ds:[00585314h],0
0000000d je 00000014
0000000f call 70032C33
00000014 xor edx,edx
00000016 mov dword ptr [ebp-4],edx
0...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...
扫描
详细接入步骤：
开始扫描 -> 获取BLE设备列表 -> 连接指定设备（也可指定MAC地址连接）-> 设备指定服务uuid和特征uuid 发送 / 接收 数据。
广播
现在常规便宜芯片并无蓝牙协议栈，只能通过人工拼包用最简单的蓝牙广...
How can one see content of stack with GDB?
...o
To read the memory at given addresses you should take a look at x
x/x $esp for hex x/d $esp for signed x/u $esp for unsigned etc. x uses the format syntax, you could also take a look at the current instruction via x/i $eip etc.
...
OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...逻辑的实现，为了做到这些，网络框架帮助应用程序管理连接，管理输入输出缓冲区，处理具体的发包收包等细节和错误的处理，处理流控，并且允许应用层注入封包，解包，新建连接时处理，断开连接时处理，收到包后处理包...
String literals: Where do they go?
...rt literals, I could see the compiler generating code such as movb $65, 8(%esp); movb $66, 9(%esp); movb $0, 10(%esp) for the string "AB", but the vast majority of the time, it will be in a non-code segment such as .data or .rodata or the like (depending on whether or not the target supports read-on...
Is errno thread-safe?
...0: 55 push ebp
1: 89 e5 mov ebp,esp
3: 83 e4 f0 and esp,0xfffffff0
6: e8 fc ff ff ff call 7 <main+0x7> ; get address of errno in EAX
b: c7 00 00 00 00 00 mov DWORD PTR [eax],0x0 ; store 0 in errno
11: b8 00...