Recent questions tagged C

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c - Reading/Writing a structure into a binary file

I am running a program with 3 structures and what I am doing to read/write in the binary file is the following ... . What could be used instead? 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 - passing struct to pthread as an argument

Ok I am trying to pass pair of numbers through struct to pthread_create function in pthread. But the numbers i ... i passing the struct wrong ? 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 there a reason why an array name is not an lvalue?

For example, int x[10]; int i = 0; x = &i; //error occurs! According to C - A Reference Manual, an ... does an error occur in the third line? 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 - Programmatically determining max value of a signed integer type

This related question is about determining the max value of a signed type at compile-time: C question: off_t ( ... ideas for proving me wrong? 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 - Sorting an array of struct pointers using qsort

I'm getting weird results from trying to use qsort on this array of structs. I have this struct: struct ... could be causing this behavior. 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 libxml2 be used to parse data from XML?

I have looked around at the libxml2 code samples and I am confused on how to piece them all together. What ... attributes. How is this done? 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 does WINAPI stand for

I've started to learn Win32 API in C. I saw that the main function is something like int WINAPI WinMain(HINSTANCE ... necessary? Thank you . :) 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 Do You Programmatically Set the Hardware Clock on Linux?

Linux provides the stime(2) call to set the system time. However, while this will update the system's time, it ... when you set the system time? 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 - Are all char arrays automatically null-terminated?

Probably I'm just too dump for googling, but I always thought char arrays get only null terminated by an literal ... a string, or is it? 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 - storing more than 2 power 31 on a 32-bit system

I have to write a program that can calculate the powers of 2 power 2010 and to find the sum of the digits ... . Please help me to understand. 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 - Read certificate files from memory instead of a file using OpenSSL

I have a server which would listen on HTTPS using OpenSSL. For this, I have to provide the certificate to ... ) { //IMPLEMENTATION REQUIRED } 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 - Zombie processes

I'v some questions about zombie processes what the benefits from zombie process concept? know that the kernel ... memory?? thanks 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 - Get last modified time of file in linux

I am working on a C program where I need to get the last modified time of the file. What the program does ... for any help you can provide. 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 preprocessor - ARRAYSIZE C++ macro: how does it work?

OK, I'm not entirely a newbie, but I cannot say I understand the following macro. The most confusing part is the ... ) % sizeof(*(a))))) 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 - About the ambiguous description of sigwait()

If no signal in set is pending at the time of the call, the thread shall be suspended until one or more ... the reason of sigwait more rational? 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 make gcc generate only machine code that can be loaded directly into memory and executed?

I would like to produce a file that I can load into memory (for example with mmap) and then jump to the ... probably work fine on its own. 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 behavior on reading object using non-character type when last written using character type

Assuming unsigned int has no trap representations, do either or both of the statements marked (A) and (B) ... an additional source of confusion. 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 - Invalid argument for read-write mmap?

I'm getting -EINVAL for some reason, and it's not clear to me why. Here's where I open and attempt to ... the error is occurring in the mmap. 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 - Can you statically compile a cygwin application?

Does cygwin allow a statically compiled binary? This would prevent the need for cygwin1.dll being on the PATH of target machines. 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 if malloc fails?

If a malloc allocation fails, should we try it again? In something like this: char* mystrdup(const char ... for checking the memory allocation? 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 - Replacing extrordinarily slow pow() function

We have a CFD solver and while running a simulation, it was found to run extraordinarily slow on some machines but ... .o and pow in libc? See Question&Answers more detail:os...

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

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290 views

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c - Do function pointers force an instruction pipeline to clear?

Modern CPUs have extensive pipelining, that is, they are loading necessary instructions and data long before they ... , not-inlined function. 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 - Relative performance of swap vs compare-and-swap locks on x86

Two common locking idioms are: if (!atomic_swap(lockaddr, 1)) /* got the lock */ and: if (! ... few cpus I have access to. See Question&Answers more detail:os...

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

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644 views

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c - How does objdump manage to display source code with the -S option?

Is there a reference to the source file in the binary? I tried running strings on the binary and couldn't find ... to the source file listed... 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 do some compilers use "a.out" as the default name for executables?

Most UNIX C compilers link executables by default to a file called "a.out". Why? Is this a written standard or ... instead of producing "a.out"? See Question&Answers more detail:os...

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

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384 views

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c - malloc behaviour on an embedded system

I'm currently working on an embedded project (STM32F103RB, CooCox CoIDE v.1.7.6 with arm-none-eabi-gcc 4.8 2013q4 ... t seem to work. Thank you. See Question&Answers more detail:os...

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

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565 views

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c - Prepending to a string

What is the most efficient way to prepend to a C string, using as little memory as possible? I am trying ... help would be appreciated. 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 - When binding a client TCP socket to a specific local port with Winsock, SO_REUSEADDR does not have any effect

I'm binding a client TCP socket to a specific local port. To handle the situation where the socket remains in ... ] How do I avoid 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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