Recent questions tagged C

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I meet some trouble when I compile some C code on my mac which give me this error : fatal error: 'endian.h' ... put this file in my mac please? 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 - sql.h header file missing though unixODBC is installed

I am on an up-to-date Ubuntu 12.04 system. I have unixodbc (v2.2.14 from ubuntu repos), MySQL and its ... source code (the latest version?)? 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 can't I ignore SIGSEGV signal?

Here is my code, #include<signal.h> #include<stdio.h> int main(int argc,char ** argv) { char *p=NULL; ... *p' value must executed too. 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 - Why is the entry point address in my executable 0x8048330? (0x330 being the offset of .text section)

I wrote a small program to add two integers and on using readelf -a executable_name it showed the entry point ... 0x330 in both the cases). 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 - memcpy(), what should the value of the size parameter be?

I want to copy an int array to another int array. They use the same define for length so they'll always be ... to update the memcpy()'s. 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 char* safe for strict pointer aliasing?

I've been trying to understand the strict aliasing rules as they apply to the char pointer. Here this is ... in a strictly aliased world? 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 enable c11 on later versions of gcc?

I currently use gcc 4.6.3. My understanding is that gcc by default uses the gnu89 standard and I would like to ... not the latest C++ one.) 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 - Invalid application of sizeof to incomplete type with a struct

I have a struct where I put all the information about the players. That's my struct: struct player{ int ... sizeof' to incomplete type `player' 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 -ffreestanding option in gcc?

What is ffreestanding in gcc ? What is it used for ? I came across the following : gcc -ffreestanding -m32 - ... , what does it mean exactly. 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 - Type casting char pointer to integer pointer

So I saw a few example on how the endianness of an architecture could be found. Let's say we have an ... rather print with %c, for character? 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 - Change process name without changing argv[0] in Linux

I need to modify the process name of my program in C language. I precise, this is not the name of a thread ... , but this solution doesn't work. See Question&Answers more detail:os...

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

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Given the following code: #include <stdio.h> #include <stdlib.h> int main() { int a[1]; int * b = malloc( ... , a);? Thank very much in advance 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 - MAC address with getifaddrs

Is there a way to get interface's MAC address via getifaddrs() ? I already have this, to get IP addresses, but I ... macp); i++; } } 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 - Why are typedef identifiers allowed to be declared multiple times?

From the C99 standard, 6.7(5): A declaration specifies the interpretation and attributes of a set of ... me a multiple definition error. 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 - Gray code increment function

Without using any external counters or other state, I'm looking for an efficient function which takes an n-bit ... any such code is known. 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 - Strange RAW Socket on Mac OS X

When i run a simple packet sniffer coded in C on my Mac OS X, i got no output at all, this is ... ./simpleSniffer Thanks for your 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 - Cross-compiling for ARM with Autoconf

I am having trouble cross-compiling a library for my arm board using autconf. I am using this line: ./configure ... googling for an hour now... 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 - flush-to-zero behavior in floating-point arithmetic

While, as far as I remember, IEEE 754 says nothing about a flush-to-zero mode to handle denormalized numbers faster ... whether I have to do 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 - How is it possible for fork() to return two values?

Since a function in C returns only one value, all the time, how can fork(), which is also a function, return two values? 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 - Recognizing arrow keys with stdin

is it possible to have a cross-platform way to handle backspace and arrows keys within a C or OCaml program? ... do it for all platforms.. 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 - Atomically increment two integers with CAS

Apparently, it is possible to atomically increment two integers with compare-and-swap instructions. This talk claims ... the possible range.) 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 - Update printf value on same line instead of new one

I would like to know if there is a way in C to overwrite an existing value that has already been printed instead of ... t); delay(2000); } }; 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 - Duplicating file pointers?

Just a quick question: Is there a way to duplicate a file pointer (those returned by fopen()), similar to how dup ... with fp2 */ fclose(fp2); 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 I can't read openssl generated RSA pub key with PEM_read_RSAPublicKey?

I'm trying to read a RSA public key generated with openssl like this: Private Key: openssl genrsa -out mykey.pem ... even a X509 pub key. 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 - Why does static initialization of flexible array member work?

I have written the following basic code for a menu: typedef struct Menu { char* title; unsigned num_submenus; ... and compiling under C99 rules. 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 detect pending system shutdown on Linux?

I am working on an application where I need to detect a system shutdown. However, I have not found any ... and without any prior warnings. 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 - #define IDENTIFIER without a token

What does the following statement mean: #define FAHAD I am familiar with the statements like: #define FAHAD 1 But ... to a constant definition? 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 - Minimizing the amount of malloc() calls improves performance?

Consider two applications: one (num. 1) that invokes malloc() many times, and the other (num. 2) that ... of allocated locations in 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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