Recent questions tagged C

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I know I can do this: #define MACRO(api, ...) bool ret = api(123, ##__VA_ARGS__); This is just an example, ... to make it work with one macro? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - find the count of substring in string

I have to find the count of a substring in a string using the C language. I'm using the function strstr but ... My question is how to do that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Undefined reference to _sbrk

I am having a problem with _sbrk. In a link phase of compilation i use below comand to link my ... together with other objects, libraries. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How would you implement tail efficiently?

What is the efficient way to implement tail in *NIX? I came up (wrote) with two simple solution, both ... satisfied. Thank you in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Make GDB print control flow of functions as they are called

How do I make gdb print functions of interest as they are called, indented according to how deep in the stack ... a script for this common job! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Compilers that support C11

I was wondering if there are any compilers that support a considerable amount of the new C11 standard. ... Selection etc. Any suggestions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How are struct members allocated in memory?

While attempting to create a memory manager for future C programs, I've come across this question: "when structs ... Or is this not guaranteed? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - recv() is not interrupted by a signal in multithreaded environment

I have a thread that sits in a blocking recv() loop and I want to terminate (assume this can't be changed to ... = s.accept() c.append(conn) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Segmentation Fault when using strtok_r

Can anyone explain why I am getting segmentation fault in the following example? #include <stdio.h> #include <string.h> ... tokens[i++]); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Buffer Overflow Attack

I'm trying to execute a very simple buffer overflow attack. I'm pretty much a newbie to this. So, if ... if any more information is needed. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How can I determine the return address on stack?

I know that if I am inside some function foo() which is called somewhere from bar() function, then this ... on x86 processor with gcc compiler. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What is the exact definition of a Metacircular Interpreter?

Is it legal to call a C compiler written in C or a PHP interpreter written in PHP metacircular? Is ... satisfy for being called Metacircular? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to #ifdef by CompilerType ? GCC or VC++

I used #ifdef Win32 for safe calls alike sprintf_s but now I want to build project with MinGW and it's just ... like that. Is it possible? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - zero length arrays vs. pointers

EDIT: apparently some of this isn't allowed/has changed in various C standards. For my own hypothetical benefit, ... around it at the moment. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - redefinition of typedef

I am possibly doing this incorrectly and this is much a question about why it works in one compiler and not the ... s gcc is being too nice? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How is if-statement and bitwise operations same in this example?

I was reading this answer and it is mentioned that this code; if (data[c] >= 128) sum += data[c ... operators achieve what if statement does? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why are threads called lightweight processes?

A thread is "lightweight" because most of the overhead has already been accomplished through the creation of its ... what it exactly means? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What is SOL_SOCKET used for?

As it is stated in the Linux man page Use this constant as the level argument to getsockopt or setsockopt to ... SOL_SOCKET? What does it do? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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418 views

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c - Array of pointers to an array of fixed size

I tried to assign two fixed-size arrays to an array of pointers to them, but the compiler warns me and I don' ... works just fine. Why is this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is struct packing deterministic?

For example, say I have two equivalent structs a and b in different projects: typedef struct _a { int ... identical padding between variables? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why does rand() repeat numbers far more often on Linux than Mac?

I was implementing a hashmap in C as part of a project I'm working on and using random inserts to test it ... 't find anything online. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Linux, timerfd accuracy

I have a system that needs at least 10 mseconds of accuracy for timers. I went for timerfd as it suits me ... delays sounds too much for me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is it possible to have a linked list of different data types?

This is just another interview question. Can we have a linked list of different data types, i.e. each ... please explain with an example? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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520 views

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c - How to get float in bytes?

I am using the HIDAPI to send some data to a USB device. This data can be sent only as byte array ... think the performance is somewhat better. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What Is The Point of Symbolic Constants?

I've having trouble understanding what is the point of Symbolic Constants in C, I am sure there is a reason for them ... = fahr + STEP; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to control mouse movement in linux?

I try to control the mouse in Linux. Xlib seems to works, but when I try to use it with OpenCV, it keeps ... , could anyone tell me another one? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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469 views

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c - Parsing WiFi Packets (libpcap)

I've been working on a way to have an OpenWRT router log WiFi probe requests to a MySQL db (it stores MAC ... (again, see page 17 here). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to fopen() on the iPhone?

The iPhone SDK docs claim fopen() is a supported method of file access but I am unable to get it to return ... am sure it is something simple! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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