Recent questions tagged C

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c - Enumerating each IP address assigned to network interfaces

I think there is no way to enumerate each network interface on my system and their assigned IP address using just ... this in a portable way? 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 - fgets skip the blank line

I am writing a C program that use fgets to read in each line from a file. The problem is that if the file ... something } else { continue; } } 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 - const qualifier for pointers to pointers

I'm having a bit trouble deducing what is const, when applied to pointers to pointers, etc. i.e., what is const ... ***foo; Foo **const foo; 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 - Regarding NAPI implementation in Linux kernel

I am trying to understand the NAPI enabled Network driver and have some doubts regarding the same. If I talk about ... me clear picture on 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 - Precedence of dereference and postfix

When I read the TCPL by K&R, I just couldn't understand two expressions: *p++ = val; /*push val onto stack * ... ,where the val should be!!! Thx 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 - Does kallsyms have all the symbol of kernel functions?

In the Linux kernel I want to probe the kernel function effective_prio(). It defined as static. When I go ... which symbols are not included? 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 any scenario where function fma in libc can be used?

I come across this page and find there is an odd floating multiply add function --fma and fmaf. It says ... the cumstom usage for this func. 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 - Function pointer without arguments types?

I was trying to declare a function pointer that points to any function that returns the same type. I omitted the ... Output: a + b = 10 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 - Convert timeval to time_t

How do I convert timeval to time_t? I'm trying to convert: umtp->ut_tv to a time_t so I can use a difftime(a, ... ; /* Time entry was made */ 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 strings be used as an array index?

Can a string be used as array index in C? Ex: String Corresponding value "ONE" 1 "TWO" 2 "FIVE" 5 " ... order to have a string-indexed array? 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 use `strtoul` to parse string where zero may be valid?

According to the documentation for strtoul, regarding its return value... This function returns the converted integral ... way to handle 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 - Implicit declaration of function 'getaddrinfo' on MinGW

I have a C program that uses getaddrinfo(). It works as expected on Linux and Mac OS X. I'm in the middle ... not sure why this isn't working. 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 readable/writable mean in a socket file descriptor? And why regular files don't bother with that?

Since I'm new in learning libev recently, there's a readable/writable concept in a io_watcher that I don't quite ... len, int flags);, right? 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 - Mono to Stereo conversion

I have the following issue here: I get a block of bytes (uint16_t*) representing audio data, and the device ... doing this? Thanks, f. 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 difference between CreateFile() and CreateFileA()?

I am following the tutorial here to communicate with the serial port The main code to open and then close the ... 10 Visual Studio 2013 express See Question&Answers more detail:os...

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

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941 views

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c - How to print time_t in a specific format?

ls command prints time in this format: Aug 23 06:07 How can I convert time received from stat()'s mtime() into this format for local 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 - invalid application of 'sizeof' to incomplete type 'struct array[]'

I am trying to organize my project by splitting commands up into separate files for easier maintenance. The ... type-int-when-accessing-intege 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 purpose of using the [^ notation in scanf?

I have run into some code and was wondering what the original developer was up to. Below is a simplified ... is it trying to accomplish? See Question&Answers more detail:os...

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

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751 views

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c - arm-linux-gnu-gcc fatal error: stdio.h: No such file or directory

These are the files in /usr/bin [root@xilinx bin]# ls -ld arm* -rwxr-xr-x. 1 root root 691752 Feb 5 ... . Host configuration Redhat 6, 64 bit 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 - union of structs sharing same first members

I have been looking into an un-traditional way of achieving struct "polymorphism" in pre-C11 C. Let's say ... from the standard given above? See Question&Answers more detail:os...

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

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590 views

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c - Win32 clipboard and alpha channel images

My application should be able to copy 32-bit images (RGB + alpha channel) to the clipboard and paste these images from ... to it here as well... See Question&Answers more detail:os...

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

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571 views

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c - Can I re-define a function or check if it exists?

I have a question about (re-)defining functions. My goal is to have a script where I can choose to define a ... )func(); } Anybody an idea? See Question&Answers more detail:os...

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

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775 views

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c - printf flush at program exit

I'm interested in knowing how the printf() function's flush works when the program exits. Let's take ... is appreciated. 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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885 views

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c - 8 bit shift operation in AVX2 with shifting in zeros

Is there any way to rebuild the _mm_slli_si128 instruction in AVX2 to shift an __mm256i register by x bytes? ... a solution for this problem? 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 prevent function from printing?

Is it possible to silence a function? For example: #include <stdio.h> int function(){ printf("BLAH!"); return 10 ... ? If positive how to do 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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838 views

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c - K&R style function definition problem

The following code works: int main() { void foo(int); foo(3); return 0; } void foo(a) int a; { printf("In ... In foo "); } Why does this happen? 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 malloc() call mmap() and brk() interchangeably?

I'm new to C and heap memory, still struggling to understand dynamic memory allocation. I traced Linux system ... a large amount of memory? See Question&Answers more detail:os...

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

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724 views

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c - Why should strtok() be deprecated?

I hear this from a lot of programmers that the use of strtok maybe deprecated in near future. Some say ... Suggest any alternatives if 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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