Recent questions tagged C

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Is there an integer type with the same size as pointer? Guaranteed on all microarchitectures? 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 - Scatter Matrix Blocks of Different Sizes using MPI

(Suppose all the matrices are stored in row-major order.) An example that illustrate the problem is to ... block size for each processor. 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 - Get the start and end address of text section in an executable

I need to get the start and end address of an executable's text section. How can I get it? I can get ... and end address of the text 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 - What goes on behind the curtains during disk I/O?

When I seek to some position in a file and write a small amount of data (20 bytes), what goes on ... better than my experimental findings? =) 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 - initializing a static variable in header

I am new in programming in C, so I am trying many different things to try and familiarize myself with the ... global)? Thanks for the 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 - Why does printf() not print anything before sleep()?

I'm just learning C with Kernighan and Ritchie's book; I'm in the basics of the fourth chapter ("Functions and ... (propolice) in OpenBSD 4.3. 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 - Non-blocking pthread_join

I'm coding the shutdown of a multithreaded server.If everything goes as it should all the threads exit by their own ... simple as I would like. 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 getting the address of an array variable mean?

Today I read a C snippet which really confused me: #include <stdio.h> int main(void) { int a[] = {0, ... 1, which is related to array decaying. 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 I debug the child process after fork() in gdb?

After calling fork,the current process will call exit(0). But the child will continue. switch(fork()) { case ... the child process in this case? 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 an empty declaration work for definitions with int arguments but not for float arguments?

I thought the difference is that declaration doesn't have parameter types... Why does this work: int ... empty parameter name list declaration 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 check if value has even parity of bits or odd?

A value has even parity if it has an even number of 1 bits. A value has an odd parity if it has ... has_even_parity(unsigned int x) { return } 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 you get the start and end addresses of a custom ELF section?

I'm working in C on Linux. I've seen the usage of of the gcc __section__ attribute (especially in the ... custom sections retrieved and used? 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 I lock files using fopen()?

I wonder if there is any way to lock and unlock a file in Linux when I open a file using fopen (not ... ) by creating and deleting lock files? 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 that a pointer argument is always double-word-aligned?

In my program I have a function that does a simple vector addition c[0:15] = a[0:15] + b[0:15 ... add this attribute to the function parameters? 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 FLT_MIN equal to zero?

limits.h specifies limits for non-floating point math types, e.g. INT_MIN and INT_MAX. These values are the ... a really large negative number? 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-platform printing of 64-bit integers with printf

In Windows, it is "%I64d". In Linux and Solaris, it is "%lld". If I want to write cross-platform printfs that ... long ll; printf(???, ll); 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 - Using sys/socket.h functions on windows

I'm attempting to utilize the socket.h functions within Windows. Essentially, I'm currently looking at the ... a UNIX environment. 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 - strlen not checking for NULL

Why is strlen() not checking for NULL? if I do strlen(NULL), the program segmentation faults. Trying to understand ... behind it (if any). 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 FLT_MIN equal to zero?

limits.h specifies limits for non-floating point math types, e.g. INT_MIN and INT_MAX. These values are the ... a really large negative number? See Question&Answers more detail:os...

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

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486 views

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c - cross-platform printing of 64-bit integers with printf

In Windows, it is "%I64d". In Linux and Solaris, it is "%lld". If I want to write cross-platform printfs that ... long ll; printf(???, ll); See Question&Answers more detail:os...

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

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464 views

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c - Using sys/socket.h functions on windows

I'm attempting to utilize the socket.h functions within Windows. Essentially, I'm currently looking at the ... a UNIX environment. 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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456 views

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c - strlen not checking for NULL

Why is strlen() not checking for NULL? if I do strlen(NULL), the program segmentation faults. Trying to understand ... behind it (if any). 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 getting all network interface names

I need to collect all the interface names, even the ones that aren't up at the moment. Like ifconfig -a. ... names just once using getifaddrs()? 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 getting all network interface names

I need to collect all the interface names, even the ones that aren't up at the moment. Like ifconfig -a. ... names just once using getifaddrs()? 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 number of Cores in cuda device?

I am looking for a function that count number of core of my cuda device. I know each microprocessor have ... devProp.totalConstMem); return; } 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 - Cannot assign requested address - possible causes?

I have a program that consists of a master server and distributed slave servers. The slave servers send status ... causes the function to fail. 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 get current process name in linux?

How can I get the process name in C? The same name, which is in /proc/$pid/status. I do not want ... there any programmatic way of doing 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 get the string size in bytes?

As the title implies, my question is how to get the size of a string in C. Is it good to use sizeof ... like to have an exhaustive response. See Question&Answers more detail:os...

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

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