Recent questions tagged c

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c - How can i execute an executable from memory?

Let's say I have included a binary into my program during compilation so, I keep it in a variable something like ... of extra work to be done 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 check whether two file names point to the same physical file

I have a program that accepts two file names as arguments: it reads the first file in order to create the ... Linux is the primary target) 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 - Delay-Load equivalent in unix based systems

What is the delay load equivalent in unix based system. I have a code foo.cpp, While compiling with gcc I ... in makefile or with linker ld? 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 - Strict aliasing and overlay inheritance

Consider this code example: #include <stdio.h> typedef struct A A; struct A { int x; int y; }; ... the authors of the standard intended? 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 - rand with seed does not return random if function looped

I wrote this C code below, when I loop, it returns a random number. How can I achieve the 5 different random values if ... is %d ", 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 - Do sleep functions sleep all threads or just the one who call it?

I am programming with pthread on linux(Centos)? I wanna to threads sleep a short time to wait for something. ... ); pthread_exit (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 - Hide cursor on remote terminal

I have an open socket to a remote terminal. Using the answer to "Force telnet client into character mode" ... remote terminal using this method? 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's initializing a global variable with return value of a function failing at declaration,but works fine at file scope?

An 80k reputation contributor R.. told me on SO that we can't initialize global variables with the return value of a ... { return 8; } Output 8 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 - implicit declaration of function 'getch'

I have a simple program: #include <stdio.h> #include <stdlib.h> int main(void){ printf("Hello world! "); ... , why does the program work OK? 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 argument passing work?

I want to know how passing arguments to functions in C works. Where are the values being stored and how ... examples would be much 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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c - Clang block in Linux?

Clang has a very cool extension named block bringing true lambda function mechanism to C. Compared to block, gcc's ... same as above) Any hints? 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 - strcat Vs strncat - When should which function be used?

Some static code analyzer tools are suggesting that all strcat usage should be replaced with strncat for safety purpose ... strcat be used ever? 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 convert st_mtime (which get from stat function) to string or char

I need to convert st_mtime to string format for passing it to java layer, i try to use this example ... in string presentation. Help please. 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 typedef a function pointer that takes a function of its own type as an argument?

Example: A function that takes a function (that takes a function (that ...) and an int) and an int. typedef ... I could just pass this one type. 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 reset static variables within a function

Is there a way to reset variables declared as static within a function? The goal is to make sure that the function ... ; } //do other things } 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 - Quick way to override -Werror flag?

If cc configuration is set to use -Werror is there a way to override -Werror flag from the terminal when using make? 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 can I still access a member of a struct after the pointer to it is freed?

If I define a structure... struct LinkNode { int node_val; struct LinkNode *next_node; }; and then create ... how the underlying process 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 - Is explicitly clearing/zeroing sensitive variables after use sensible?

I have noticed some programs explicitly zero sensitive memory allocations after use. For example, OpenSSL has a method ... of the first program? 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 - Make gcc use conditional moves

Is there a gcc pragma or something I can use to force gcc to generate branch-free instructions on a specific ... of the versions gcc produces. 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 - Set a timeout for reading stdin

Is there a way to timeout a reading from stdin in order for the program not to hang for too long ? read(0, var, numberofbytes); 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 - subnormal IEEE 754 floating point numbers support on iOS ARM devices (iPhone 4)

While porting an application from Linux x86 to iOS ARM (iPhone 4), I've discovered a difference in behavior ... floating point code ? Thanks. 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 - Enumeration Scope

If I have enums like: enum EnumA { stuffA = 0 }; enum enumAA { stuffA = 1 }; What happens here when you refer ... 't seem to be the case 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 - How to make gcc warn about returning the address of local variables?

With gcc 4.4.5, I have a warning with the following code. char *f(void) { char c; return &c; } But, ... , but can gcc warn about such 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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c - Detect death of parent process

How can I detect parent process death in Linux OS? If in parent process called fork(), that create child ... can detect parent process' death? 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 - Portable serialisation of IEEE754 floating-point values

I've recently been working on a system that needs to store and load large quantities of data, including single- ... faster and/or more reliable. 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 - C11 grammar ambiguity between _Atomic type specifier and qualifier

I'm trying to write a lex/yacc grammar for C11 based off of N1570. Most of my grammar is copied ... reduce using rule 156 (type_qualifier) 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 I make valgrind ignore glibc libraries?

Is it possible to tell valgrind to ignore some set of libraries? Specifically glibc libraries.. Actual Problem: I ... no luck. Any suggestions? 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 realloc fail (return NULL) when trimming?

If do the next: int* array = malloc(10 * sizeof(int)); and them I use realloc: array = realloc(array, 5 * ... and only it), can it return 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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