Recent questions tagged C

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c - Restricting symbols in a Linux static library

I'm looking for ways to restrict the number of C symbols exported to a Linux static library (archive). I'd like ... both GCC 3 and 4. 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 - How to work with external libraries when cross compiling?

I am writing some code for raspberry pi ARM target on x86 ubuntu machine. I am using the gcc-linaro-armhf ... got correct std headers and libs? 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 - Tool to analyze size of ELF sections and symbol

I need a way to analyze output file of my GCC compiler for ARM. I am compiling for bare metal and I am quite ... own code is in its own section. 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 - Where did the name `atoi` come from?

In the C language where did they come up with the name atoi for converting a string to an integer? The only ... that doesn't really make sense. 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 *ptr[10] and (*ptr)[10]

For the following code: int (*ptr)[10]; int a[10]={99,1,2,3,4,5,6,7,8,9}; ptr=&a; printf("%d" ... *ptr[1]); It is giving the segmentation fault. 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 we know the caller function's name?

In the C language, __FUNCTION__ can be used to get the current function's name. But if I define a function ... related to C99 or something else. 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 realloc overwrite old contents?

When we reallocate memory via realloc(), are the previous contents over-written? I am trying to make a ... it compiler dependent for example? 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 - Program received signal SIGPIPE, Broken pipe

I write a client program based on posix sockets. The program creates multiple threads and is going to lock the server. ... it is and what to 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 - Providing/passing argument to signal handler

Can I provide/pass any arguments to signal handler? /* Signal handling */ struct sigaction act; act.sa_handler = ... the API designed this 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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c - Valgrind not showing line numbers in spite of -g flag (on Ubuntu 11.10/VirtualBox)

I'm following 'Learn C the Hard Way', specifically the chapter on Valgrind. This chapter gives you a deliberately ... this paste for an example. 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 - Function pointer as an argument

Is it possible to pass a function pointer as an argument to a function in C? If so, how would I declare ... a function pointer as an argument? 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 can cause a “Resource temporarily unavailable” on sock send() command

What can cause a Resource temporarily unavailable error on a socket send() command? The socket is setup as ... for general ideas. 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 - make: Nothing to be done for `all'

I am going through an eg pgm to create a make file. http://mrbook.org/tutorials/make/ My folder ... understand to compile this program. 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 compilers assign memory addresses to variables?

I teach a course where students get to ask questions about programming (!): I got this question: Why does the ... 's question better than me. 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 I get/set a struct member by offset

Ignoring padding/alignment issues and given the following struct, what is best way to get and set the value of ... wrong. Cheers for any help 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 it possible to store the address of a label in a variable and use goto to jump to it?

I know everyone hates gotos. In my code, for reasons I have considered and am comfortable with, they provide ... *the_label_pointer; 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 - Difference between <string.h> and <strings.h>

I noticed that there was (at least on Mac OS X) both a <string.h> header and a <strings.h> header. ... functions. Is there any reason for 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 - How to do encryption using AES in Openssl

I am trying to write a sample program to do AES encryption using Openssl. I tried going through Openssl documentation( ... to figure this out... 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 - fast algorithm for drawing filled circles?

I am using Bresenham's circle algorithm for fast circle drawing. However, I also want to (at the request of the ... language I am using is C. 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 surface and texture (SDL / general)

Can anyone explain to me in simple words what is the difference between texture and surface? I saw it ... deeper into computer graphics stuff. 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 - Pthreads vs. OpenMP

I'm creating a multi-threaded application in C using Linux. I'm unsure whether I should use the POSIX thread ... -level or user-level threads? 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 this bitwise operation check for a power of 2?

I'm looking at some code which should be trivial -- but my math is failing me miserably here. Here's a condition ... a number is a power of 2? 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 does a dot before the variable name in struct mean?

looking at the linux kernel source, I found this: static struct tty_operations serial_ops = { .open = tiny_open, ... before the variable name? 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 new Linux kernel scheduler

Looking through the scheduler source code (2.6.34, kernel/sched.c), I can see how the "pluggable" schedulers are ... think I've figured it out. 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 - Visually what happens to fork() in a For Loop

I have been trying to understand fork() behavior. This time in a for-loop. Observe the following code: ... 7 children, which is correct? 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 GDB jumps unpredictably between lines and prints variables as "<value optimized out>"?

Can anyone explain this behavior of gdb? 900 memset(&new_ckpt_info,'',sizeof(CKPT_INFO)); (gdb) **903 prev_offset = ... set the value of found? 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 a null pointer and a void pointer?

Whats the difference between a Null pointer & a Void pointer? 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 - The difference between asm, asm volatile and clobbering memory

When implementing lock-free data structures and timing code it's often necessary to suppress the compiler's optimisations. ... ::: "memory"); See Question&Answers more detail:os...

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

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