Recent questions tagged C

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I have bit field declared this way: typedef struct morder { unsigned int targetRegister : 3; unsigned int ... of the whole word). 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 safe to use realloc?

Some time ago a friend of mine told me not to use realloc because it's unsafe, but he couldn't tell me ... any other way to reallocate 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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c - Structure member assignment causing syntax error when not inside a function

I want to assign a particular value to a (user defined) global variable in C programming language. When I am ... tell the 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 - What precisely does the %g printf specifier mean?

The %g specifier doesn't seem to behave in the way that most sources document it as behaving. According to ... logic that governs this output? 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 - Casting void pointers

I've seen a lot of the following in older C code: type_t *x = (type_t *) malloc(...); What's the ... malloc() used to return char * instead? 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 - inlining failed in call to always_inline ‘_mm_mullo_epi32’: target specific option mismatch

I am trying to compile a C program using cmake which uses SIMD intrinsics. When I try to compile it, I ... "${CMAKE_CXX_FLAGS} -ssse3") 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 - Can Windows Store applications be built with Mingw?

Is there a way to build Windows Store applications with the Mingw toolchain? (And ultimately cross compile them from ... way to achieve 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 - C11 _Generic: how to deal with string literals?

Using the _Generic feature in C11, how do you deal with string literals? For instance: #include <stdio.h> #define ... s a compiler bug or not. 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 - gcc warning: braces around scalar initializer

I have look-up-table as defined below and I'm making use of GCC. When I compile I get warnings as warning: braces ... , 0.017257, 0.085251}}}; 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 select(2) do if you close(2) a file descriptor in a separate thread?

What is the behavior of the select(2) function when a file descriptor it is watching for reading is closed by ... a deadlock if it were closed. 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 would you use the ternary operator without assigning a value for the "true" condition (x = x ?: 1)

In the Android open-source qemu code I ran across this line of code: machine->max_cpus = machine-> ... www.comeaucomputing.com/tryitout/ . 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 - 32-bit signed integer multiplication without using 64-bit data type

I want to do 32-bit signed integer multiplication without using a 64-bit data type. My inputs are in Q1. ... the explanation with formats also. 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 - Socket Programming -- recv() is not receiving data correctly

I have looked at the similar threads but can't seem to find anything that could solve my problem. I am ... gfserv; } void gfserver_set_port(gfserver_t *gfs, unsigned short port...

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

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c - pointer of a pointer in linked list append

I normally program in python. To increase performance of my simulations, I am learning C. I have a problem to ... I can read up about 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 - offsetof at compile time

Is there a way of finding the offset of a member of a structure at compile-time? I wish to create a constant ... ", ofs ); 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 - How can I flush unread data from a tty input queue on a UNIX system?

My program has to read just ONE character from the standard input, and so I use read(0, buffer, 1). But if ... , and not the b written before. 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 - Incrementing Pointers, Exact Sequence

I have just started to learn C, and I get that *a = *b; a++; b++; and *a++ = *b++ are ... the compiler uses to interpret this line of code? 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 - Nested structures

The following code compiles on a C++ compiler. #include <cstdio> int main() { struct xx { int x; struct ... would there be any compiler 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 - Difference between scanf() and strtol() / strtod() in parsing numbers

Note: I completely reworked the question to more properly reflect what I am setting the bounty for. Please excuse any ... 0, consumed 1 */ 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 tell GCC to generate 16-bit code for real mode

I am writing real mode function, which should be normal function with stackframes and so, but it should use %sp instead ... some way 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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303 views

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c - Bit popcount for large buffer, with Core 2 CPU (SSSE3)

I'm looking for the fastest way to popcount on large buffer of 512 or more bytes. I can guarantee any ... , 48 bits virtual power management: 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 - Reopen a file descriptor with another access?

Assume the OS is linux. Suppose I opened a file for write and get a file descriptor fdw. Is it possible to ... change the access right, I think. 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 - Return value of fgets()

I have just recently started working with I/O in C. Here is my question - I have a file, from which I read my ... while reading the file. "); } 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 - openCV Error: Assertion failed (scn == 3 || scn == 4)

I am having Assertion failed error at the last frame , while reading and writing a video frame by frame. The errors ... frame"); return -1; } 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 a main function without a return statement return value 12?

I have written a program that prints a table. I have not included the return syntax in the main function, but ... I execute the program. 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 - LoadLibrary() an EXE?

I have an executable (that I created using Visual C++ 10), and I need to use its capabilities from another ... as in an old Chinese curse. 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 - Same output for htonl() and ntohl() on an integer

I ran the following program on little-endian [LE] machine [Linux, Intel processor]. I am unable to explain ... - 0x78563412 Host - 0x78563412 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 - Linux function to get mount points

Is there a function (or interface; ioctl, netlink etc) in the standard Linux libs that will return the current ... it parses files in /proc See Question&Answers more detail:os...

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

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