Recent questions tagged C

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c - How to monitor variables in GDB and log it if it meets certain conditions?

I would like to know if there is any way in which I can monitor a value of a variable until for ... variable value during each counter value? 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 - Difference between "while" loop and "do while" loop

What is the difference between while loop and do while loop. I used to think both are completely same.Then I ... other difference in these two? 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 useful case using a switch statement without braces?

In H&S5 I encountered the "most bizarre" switch statement (8.7.1, p. 277) not using braces. Here's the ... having some sort of useful purpose? 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 does fork() know when to return 0?

Take the following example: int main(void) { pid_t pid; pid = fork(); if (pid == 0) ChildProcess(); else ... thinking that is how fork() works? 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 getpid() return pid_t instead of int?

What's the logic behind calls like getpid() returning a value of type pid_t instead of an unsigned int? Or ... different sizes of ints 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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c - Getopt- Passing string parameter for argument

I have a program which takes in multiple command line arguments so I am using getopt. One of my arguments takes ... "wrong message" break; } } 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 include only used symbols when statically linking with gcc?

I'm deploying a small program compiled with gcc, 4.3.2-1.1 (Debian). This program will be deployed on ... only as a temporary work around. 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 - Aligned memory management?

I have a few related questions about managing aligned memory blocks. Cross-platform answers would be ideal. However ... in place where 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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c - pthread_detach question

Till recently, I was under the impression that if you "detach" a thread after spawning it, the thread lives even after ... .. "); return 0; } 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 background processes using fork() and child processes in my dummy shell

I'm trying to create a simple shell program in C. What I need it to do is provide the user with a ... of 'background', sorry for the 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 - What is the difference between read and pread in unix?

What is the difference between the functions read() and pread() in unix? When choosing between them, what ... between them but without results. 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 stdin and STDIN_FILENO?

What is the practical difference, if any, between stdin and STDIN_FILENO in 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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c - What is the maximum number of characters for a host-name in Unix?

I am wondering what is the maximum number of characters for a host-name in a Unix system. In addition is there any ... ). I am programming in 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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c - segmentation fault : 11

I'm having a problem with some program, I have searched about segmentation faults, by I don't understand them quite ... } Thanks for your 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 - Memory allocated with malloc does not persist outside function scope?

Hi, I'm a bit new to C's malloc function, but from what I know it should store the value in the heap, so you ... printf("%d ", a); return 0; } See Question&Answers more detail:os...

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

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465 views

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c - Clearing the serial port's buffer

This is what my function looks like to open the serial port (using Ubuntu 12.04): int open_port(void) { int ... but no such luck. Any insight? See Question&Answers more detail:os...

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

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358 views

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c - How are hash tables implemented internally in popular languages?

Can someone please shed some light on how popular languages like Python, Ruby implements hash tables internally ... efficient and practical. 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 1103515245 is used in rand?

I'm talking about this surprisingly simple implementation of rand() from the C standard: static unsigned long int ... and easier to remember. See Question&Answers more detail:os...

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

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532 views

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c - How to find my current compiler's standard, like if it is C90, etc

I'm working on a Linux machine. Is there any system command to find the standard followed by the C compiler I'm using? 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 the functions of the exec family of system calls like exec and execve?

I have been following a system programming course recently and I came through the system calls exec() and execve(). ... ), execle(), execvp(). 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 - Best way to check if a character array is empty

Which is the most reliable way to check if a character array is empty? char text[50]; if(strlen(text) == ... efficient way to go about 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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405 views

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c - Inject shared library into a process

I just started to learn injection techniques in Linux and want to write a simple program to inject a shared ... asking about LD_PRELOAD trick. See Question&Answers more detail:os...

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

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392 views

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c - RSA encrypt/decrypt

I'm writing a C program that encrypts(based on the private key) and decrypts(based on the public key) text. I' ... any decent one on the web. See Question&Answers more detail:os...

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

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420 views

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c - Linux select() vs ppoll() vs pselect()

In my application, there is a io-thread, that is dedicated for Wrapping data received from the application in a ... thoughts on one vs the other 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 dynamically allocate arrays inside a kernel?

I need to dynamically allocate some arrays inside the kernel function. How can a I do that? My code is something ... for 20 minutes, at least. 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 are the different segments like heap, stack, text related to the physical memory?

When a C program is compiled and the object file(ELF) is created. the object file contains different sections ... a program is in execution? See Question&Answers more detail:os...

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

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310 views

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c - Correct, portable way to interpret buffer as a struct

The context of my problem is in network programming. Say I want to send messages over the network between ... and thus has undefined 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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574 views

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c - How to initialize const members of structs on the heap

I would like to allocate a structure on the heap, initialize it and return a pointer to it from a ... heap which contains const members? See Question&Answers more detail:os...

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

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