Recent questions tagged C

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I need to handle SIGCHLD properly. How can I use it with my existing code? at the moment I cant wait for the ... parent is executed 1st.. why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Finding consecutive bit string of 1 or 0

How to find the length of the longest consecutive bit string(either 1 or 0)? 00000000 11110000 00000000 00000000 -> ... 1 then length will be 12 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - memory alignment within gcc structs

I am porting an application to an ARM platform in C, the application also runs on an x86 processor, and must ... . Any help is much appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - CPU and Data alignment

Pardon me if you feel this has been answered numerous times, but I need answers to the following queries! Why data has ... at 1008 (or at 1005)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Does C99 guarantee that arrays are contiguous?

Following an hot comment thread in another question, I came to debate of what is and what is not defined in ... the C99 standard are relevant. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Detecting Endianness

I'm currently trying to create a C source code which properly handles I/O whatever the endianness of the target ... https://godbolt.org/g/DAafKo See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to redirect the output back to the screen after freopen("out.txt", "a", stdout)

#include <stdio.h> int main() { printf("This goes to screen "); freopen("out.txt", "a", stdout); printf ... using ANSI C or POSIX system calls? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - When can argv[0] have null?

What I have understand about passing arguments to main() from command line is that argc has a minimum value of ... name will not be available? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Can a pointer (address) ever be negative?

I have a function that I would like to be able to return special values for failure and uninitialized (it ... that address as a sentinel. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is there a way to flush a POSIX socket?

Is there a standard call for flushing the transmit side of a POSIX socket all the way through to the remote end ... but couldn't find anything. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Save HBITMAP to *.bmp file using only Win32

I have a HBITMAP in my pure Win32 project (no external libraries are used). Can I export it to a *.bmp ... to add dependencies to the project? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Directly Read/Write Handshake data with Memory BIO

I need to create an OpenSSL connection where I can directly read/write handshake data. The reason is the ... be very appreciated. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - get process name from process id (win32)

I need to get a list of all processes on a windows system including names and PID. EnumProcess can obtain a list ... run by a different user). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to call exported kernel module functions from another module?

I'm writing an API as a kernel module that provides device drivers with various functions. I wrote three ... Do no other alternatives exist? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - WaitForSingleObject and WaitForMultipleObjects equivalent in Linux?

I am migrating an applciation from windows to linux. I am facing problem with respect to WaitForSingleObject and ... implement this in Unix? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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311 views

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c - Convert double/float to string

I need to convert a floating point number to an equivalent string in decimal (or other base). Conversion at first ... goes into a toy kernel. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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261 views

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c - Can an equality comparison of unrelated pointers evaluate to true?

Section 6.5.9 of the C standard regarding the == and != operators states the following: 2 One of the ... gcc non-conforming in this case? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How does printf and co differentiate between float and double

Since it isn't strongly typed I thought it just picked the right memory size and interpreted it based on the ... it work for scanfs/sscanf? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What's the difference between array and &array?

Assume that int array[16]; There is standard conversion called array-to-pointer conversion, so array would be ... no compiling error. Why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What's the difference between static inline, extern inline and a normal inline function?

What's the difference between a static inline, extern inline and a normal inline function? I've seen some ... would be greatly appreciated! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Rationale behind the container_of macro in linux/list.h

In the implementation of linux kernel lists in /include/linux/list.h, what is the rationale behind the first line ( ... ((TYPE *)0)->MEMBER) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - strcpy() return value

A lot of the functions from the standard C library, especially the ones for string manipulation, and most notably ... to justify this idiom? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - difference between int* i and int *i

I'm converting a header file for a DLL written in C to Delphi so I can use the DLL. My question is what ... 'm not sure what the difference is. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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657 views

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c - 32 bit unsigned multiply on 64 bit causing undefined behavior?

So I have about this code: uint32_t s1 = 0xFFFFFFFFU; uint32_t s2 = 0xFFFFFFFFU; uint32_t v; ... v ... conforming compiler is likely affected). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How can you flush a write using a file descriptor?

It turns out this whole misunderstanding of the open() versus fopen() stems from a buggy I2C driver in the Linux ... ioctl(fd,...); Suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - String input to flex lexer

I want to create a read-eval-print loop using flex/bison parser. Trouble is, the flex generated lexer wants input ... . Is there a better way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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629 views

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c - Compiler warning - suggest parentheses around assignment used as truth value

When I try to compile the piece of code below, I get this warning: warning: suggest parentheses around assignment ... list; return NULL; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Setting std=c99 flag in GCC

I was wondering if there were any files in which I could set the -std=c99 flag, so that I would not have to set ... am using GCC 4.4 on Ubuntu. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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