Recent questions tagged C

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c - Distinction between processes and threads in Linux

After reading up on this answer and "Linux Kernel Development" by Robert Love and, subsequently, on the clone() ... according to top - 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 - executing default signal handler

I have written an application where i have registered number of signal handler for different signals in linux . ... Operating system would do . 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 - Variable declaration vs definition

I was reading some info on externs. Now the author started mentioning variable declaration and definition. By declaration ... I get it right? 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 - Returning a struct pointer

Suppose I have the following struct and function returning a pointer: typedef struct { int num; void *nums; ... through a pointer immediately? 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 `break` work only for `for`, `while`, `do-while`, `switch' and for `if` statements?

Suppose, I have a if statement inside a for loop: for( ; ; ) { if( ) { printf(" inside if"); ... the condition in the if becomes satisfied? 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 kill a child process by the parent process?

I create a child process using a fork(). How can the parent process kill the child process if the child process ... have any idea to do that? 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 - Warning: comparison with string literals results in unspecified behaviour

I am starting a project of writing a simplified shell for linux in C. I am not at all proficient with C ... print_cmd(&cmd_info); return 0; } 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 is it valid to access a pointer to a "dead" object?

First, to clarify, I am not talking about dereferencing invalid pointers! Consider the following two examples. Example 1 ... the C++ standards. 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 create a file with file holes?

File holes are the empty spaces in file, which, however, doesn't take up any disk space and contains ... file holes for experimenting with. 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 - Number of character cells used by string

I have a program that outputs a textual table using UTF-8 strings, and I need to measure the number of ... to do this with standard functions. 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 create a typedef for function pointers

I think it would be easier to use function pointers if I created a typedef for a function pointer, but I seem to ... . What replaces <???> ? 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 - Floating point linear interpolation

To do a linear interpolation between two variables a and b given a fraction f, I'm currently using this ... an explicit floating-point literal. 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 do an specific action when a certain breakpoint is hit in GDB?

I am looking for a way to do some action when a particular break point hits in gdb. Basically I have some memleak ... any good way to do this? 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 - Why is the compiler throwing this warning: "missing initializer"? Isn't the structure initialized?

I'm creating some sort of frontend for a program. To launch the program I'm using the call CreateProcess(), ... ? Which one would you recommend? 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 - pthread synchronized blocking queue

I'm looking for a recommended implementation of a thread-safe blocking queue (multi producer/consumer) ... pthread synchronization semantics. 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 - Encrypting and decrypting a small file using openssl

I want to write a small program in C/C++ which reads a small text file, and encrypts it, using a " ... somebody ever tried to do this thing? 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 - addr2line on kernel module

I'm trying to debug kernel module. I suspect to have there some memory leaks. To check it I have prepared ... to files and line numbers? 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 - GCC memory barrier __sync_synchronize vs asm volatile("": : :"memory")

asm volatile("": : :"memory") is often used as a memory barrier (e.g. as seen in the Linux kernel barrier ... would one used over the other ? 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 - Using dup2 for piping

How do I use dup2 to perform the following command? ls -al | grep alpha | more 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 do I get the selected text from the focused window using native Win32 API?

My app. will be running on the system try monitoring for a hotkey; when the user selects some text in any ... with plain Win32 system APIs? 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 - mmap, msync and linux process termination

I want to use mmap to implement persistence of certain portions of program state in a C program running under ... person might chime in. 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 - use RPATH but not RUNPATH?

This page - http://labs.qt.nokia.com/2011/10/28/rpath-and-runpath/ - says about order for library ... ? Can somebody explain the situation? 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 is the Log API to call from an Android JNI program?

I would like to debug a JNI C application by inserting log messages to logcat. What is the C API that does this? 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 - Assigning memory to double pointer?

I am having trouble understanding how to assign memory to a double pointer. I want to read an array of strings and ... And if so why is it? 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 - fork() and wait() with two child processes

I need to use the fork() and wait() functions to complete an assignment. We are modelling non-deterministic behavior and ... } } } return 0; } 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 - lvalue required as increment operand

gcc 4.4.4 What am I doing wrong? char x[10]; char y[] = "Hello"; while(y != NULL) *x++ = *y++; Many thanks for any advice. 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 copy directory from source tree to binary tree?

Copying directory from source tree to binary tree. For example: How to copy www to bin folder. work ├─bin ... │ └─www ├─include └─lib 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 - Any simple way to log in Android NDK code?

I'm looking for a way to easily debug C code in an Android NDK application using Eclipse. I've read ... anyone have any experience doing this? See Question&Answers more detail:os...

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

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