Recent questions tagged C

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c - Padding bits in unsigned integers and bitwise operations in C89

I have a lot of code that performs bitwise operations on unsigned integers. I wrote my code with the assumption ... object type would also do. 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 can I detect whether a specific page is mapped in memory?

I would like to detect whether or not a specific page has already been mapped in memory. The goal here is to be ... : is there such a thing ? 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 C11 cor 1:2012?

I just noticed that there has been a correction to the C11 standard called ISO/IEC 9899:2011/Cor 1:2012. What was changed in this update? 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 broadcasting via TCP possible?

I'm writing a server/client system in C, which uses BSD Sockets under a TCP connection. The server is multi-threaded ... , like you can via UDP? 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 - Correct way to use scanf / printf (and family) with fixed size types?

Reading this SO question, I started wondering - what is the correct way to use scanf/printf (and family) ... think this deserves down-votes. 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 - Determining the Length of a String Literal

Given an array of pointers to string literals: char *textMessages[] = { "Small text message", "Slightly larger ... length of the string literal. 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 - Thread name longer than 15 chars?

By using functions like prctl, or pthread_set_name_np it's possible to change the name of a thread. The limit ... .37/include/linux/sched.h#L245 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 happens when we call Malloc with negative parameter?

7.22.3.4 The malloc function The malloc function allocates space for an object whose size is specified by size and ... Read this link:malloc(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 - Is GOTO considered harmless when jumping to cleanup at the end of function?

The goto statement has been examined at great length in several SO discussions (see this and that), and I ... the general use of goto. 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 - fopen / fopen_s and writing to files

I'm using fopen in C to write the output to a text file. The function declaration is (where ARRAY_SIZE has been ... decimal point. Am I 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 - How to hide leading zero in printf

The following outputs 0.23. How do I get it to simply output .23? printf( "%8.2f" , .23 ); 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 calloc() allocate more than SIZE_MAX in total?

In a recent code review, it was claimed that On select systems, calloc() can allocate more than SIZE_MAX total bytes whereas ... , 2) != NULL; } 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 - Converting an UnsafePointer with length to a Swift Array type

I'm looking for the simplest ways to achieve reasonable C interoperability in Swift, and my current block is ... happy to stick with that. 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 - strstr() for a string that is NOT null-terminated

How do I do the in-place equivalent of strstr() for a counted string (i.e. not null-terminated) 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 - atoi() from hex representation string

Need to make int from hex representation string like "0xFA" or better "FA". Need something like atoi("FA") ... any standard solutions for that? 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 - Error Deflate And Inflate With zLib

I'm trying to compile the zpipe.c example in my Linux(Ubuntu 8.04) with gcc, but I'm getting some errors, ... but why i'm getting this errors? 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 - Python Netlink Multicast Communication in Kernels above 4

I was trying to reproduce the example from a previous SO post on a kernel above 4 (4.1): #include <linux/ ... socket.error, e: print 'Exception' 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 - Program to read words from a file and count their occurrence in the file

I'm currently trying to make a program that will read a file find each unique word and count the number of ... my program will 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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608 views

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c - "Server" to "Server" ZeroMQ communication

I want to build a system that has the following architecture: +------------------+ +------------ ... mechanism to notify App1 that App2 is up ? 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 - Do I need to do anything with a SIGCHLD handler if I am just using wait() to wait for 1 child to finish at a time?

I've got a program that is forking to a child to do some work, but I am only doing one child at a ... finishes, parent loops to next work item 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 it recommended method for computing the size of a file using fseek()?

In C, we can find the size of file using fseek() function. Like, if (fseek(fp, 0L, SEEK_END) != 0) { // ... of a file using fseek() and ftell()? See Question&Answers more detail:os...

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

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618 views

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c - How do I use merge sort to delete duplicates?

I use recursive merge sort for sorting a link list, but during the merge sort I would like to delete duplicates. Anyone ... ? I am using C code. See Question&Answers more detail:os...

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

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452 views

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c - Explanation of an algorithm to set, clear and test a single bit

Hey, in the Programming Pearls book, there is a source code for setting, clearing and testing a bit of ... read the previous related 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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655 views

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c - How do I use libcurl to login to a secure website and get at the html behind the login

I was wondering if you could help me work through accessing the html behind a login page using C and libcurl. ... with some examples, 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 - Gstreamer 1.0: Video from tutorials is not playing on MacOS

I am trying to compile this tutorial Tutorial_01 on my MacOS 10.11.3 with Xcode 7.2 and not getting any ... Sub-class should implement drain() See Question&Answers more detail:os...

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

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582 views

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c - Using Malloc Hooks

I am trying to use a malloc hook to create a custom function my_malloc(). In my main program when I call malloc() ... on how to do this 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 - Python ctypes and function calls

My friend produced a small proof-of-concept assembler that worked on x86. I decided to port it for x86_64 ... .text section is write protected? See Question&Answers more detail:os...

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

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569 views

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c - pthread_cond_timedwait()

void wait(int timeInMs) { struct timespec timeToWait; timeToWait.tv_sec = 5; timeToWait.tv_nsec = timeInMs*1000; int rt ... 't make sense to 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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