Recent questions tagged C

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c - GTK3 and multithreading, replacing deprecated functions

I would like to replace deprecated functions gdk_threads_enter()/leave() in my application that uses threads. The ... in the GUI window. 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 "sigaltstack" in signal handler program?

Do anyone know how to use the sigaltstack in a real signal handler program? A simple but complete code may be great help! 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 - Makefile: Error1

I have a very simple c programme: int main() { return(1); } and a simple Makefile: all: gcc -ansi - ... 1 What obvious thing am I missing? 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 - OpenGL: secondary thread for loading resources?

Working with C and Win32, I would like to know how to implement a secondary OpenGL thread for loading resources(textures ... do I need to call? 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 - Hex to ascii string conversion

i have an hex string and want it to be converted to ascii string in C. How can i accomplish 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 - Get current time in seconds in kernel module

What is the standard way to get the current time in seconds (since the epoch) in a kernel module? I have seen ... is not allowed in the kernel] 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 are "extended integer types"?

Quoting from the book I'm reading: signed char, signed short int, signed int, signed long int, signed long ... integer types"? Any examples? 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 is Linux memmove() implemented the way it is?

From the Linux manpage for memmove(3) The memmove() function copies n bytes from memory area src to memory ... . I'm just curious. 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 objdump not show .bss, .shstratab, .symtab and .strtab sections?

I'm currently doing my own objdump implementation in C. For my -s option, I have to show the full contents ... does not shows these sections ? 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 I programmatically return the max of two integers without using any comparison operators and without using if, else, etc?

How do I programmatically return the maximum of two integers without using any comparison operators and without using if, else, etc? See Question&Answers more detail:os...

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

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422 views

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c - while(1) .. break instead of goto

I found the following code in a C program: while (1) { do_something(); if (was_an_error()) break; ... 943826 doesn't answer my question. 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 - execve file not found when stracing the very same file!

someone i know encountered a problem when running 'lmutil' so i asked them to strace -f lmutil. Why is ... : Bourne shell script text executable 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 calloc require two parameters and malloc just one?

It's very bothersome for me to write calloc(1, sizeof(MyStruct)) all the time. I don't want to use an idea ... use it without 1, at the start. 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 gets() equivalent in C11?

From cplusplus.com The most recent revision of the C standard (2011) has definitively removed this function from its ... gets() in C11 standard? See Question&Answers more detail:os...

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

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720 views

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c - For pthread, How to kill child thread from the main thread

I use pthread_create to create several child threads. At a time, the main thread wants to kill all child ... and programming language is C. See Question&Answers more detail:os...

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

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620 views

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c - Installing PygraphViz on Windows, Python 2.6

Anybody out there has successfully installed PygraphViz on Windows? Since there is not an official release for ... help would be appreciated! See Question&Answers more detail:os...

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

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679 views

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c - Using scanf for reading an unsigned char

I'm trying to use this code to read values between 0 to 255 (unsigned char). #include<stdio.h> int ... read unsigned char values using scanf? See Question&Answers more detail:os...

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

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526 views

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c - strncpy or strlcpy in my case

what should I use when I want to copy src_str to dst_arr and why? char dst_arr[10]; char *src_str = "hello"; ... . That is not the concern 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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403 views

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c - UTF-8 in Windows

How do I set the code page to UTF-8 in a C Windows program? I have a third party library that uses fopen ... . How can I get around 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 - Why doesn't gcc allow a const int as a case expression?

I was looking at this SO question and got to thinking about const ints versus #defines and realized I don't actually ... (gcc 4.2.1) happy. See Question&Answers more detail:os...

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

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376 views

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c - Get called function name as string

I'd like to display the name of a function I'm calling. Here is my code void (*tabFtPtr [nbExo])(); // ... [nbExo]. Thanks for helping 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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550 views

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c - Why is glibc's sscanf vastly slower than fscanf on Linux?

I am using GCC 4.8 and glibc 2.19 on an x86_64 Linux. While playing with different input methods for ... insights in this strange discrepancy? See Question&Answers more detail:os...

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

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477 views

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c - How to make gdb print out all values in hexadecimal mode?

By default, gdb always prints/displays all variables / arguments in base 10. Is there any way to ask gdb to always ... to do it everytime.... See Question&Answers more detail:os...

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

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500 views

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c - typedef a struct before it's declared

I'm not a beginner, I'm very familiar with the following idiom: typedef struct Foo_ Foo;// I know ... guys for so much helpful information. See Question&Answers more detail:os...

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

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502 views

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c - Detecting Integer Constant Expressions in Macros

There was a discussion in the Linux kernel mailing list regarding a macro that tests whether its argument is ... Kernel's __is_constexpr 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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427 views

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c - "break;" out of "if" statement?

Can you break out of an if statement or is it going to cause crashes? I'm starting to acquaint myself with C, but ... = straw; } printf(" "); See Question&Answers more detail:os...

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

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390 views

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c - what does this instruction do?:- mov %gs:0x14,%eax

My hello & regards to all. I have a C program, basically wrote for testing Buffer overflow. #include<stdio.h> ... in the program? 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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334 views

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c - How to append data on a packet from kernel space?

I am trying to append some data on a packet from kernel space. I have an echo client and server. I type ... kernel. Any suggestion is welcomed. See Question&Answers more detail:os...

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

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