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Questions - system-calls

Redirect output of command line to a variable in C

Is there a way to redirect output of a command line which returns integer as an output to a variable in C? for example, if the command is "cmd", then is there a way to redirect its output (a...
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qwerty

c

system

system-calls

popen

fgets

Votes: 0

Answers: 3

Latest Answer

It works perfectly fine with popen and fgets: #include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { const char *cmd = argc > 1 ? argv[1] : "echo 42"; ...
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William Pursell

how to uncompress a compressed file using system call in C

I want to uncompress a tar.gz file into a unique directory using system call in C. Can anyone please help me with that. I will be running the .c file in linux.
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user18726987

c

system-calls

unzip

Votes: 0

Answers: 1

Latest Answer

Being specific, there is no syscall for decompression. But you can achieve this my attaching a kernel module with decompression algorithm and calling it from user space program.
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hsuecu

mmap() system call linux 32-bit x86 NASM(i386)

I am trying to use mmap for my code but I dont have a clue to choose the values to store in the registers in pre interrupt processing. I picked up below part of code from somewhere. I am trying to pri...
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Mike

linux

assembly

x86

system-calls

mmap

Votes: 0

Answers: 0

How to use read syscall with an integer fd in C++

I am working with sockets. On creating one using socket(), we get an integer file descriptor. I then want to read data from this fd. To do so, I was following functioning C code - using the read() sys...
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Vedaant Arya

c++

c

system-calls

Votes: 0

Answers: 1

Latest Answer

You might be missing #include <unistd.h> But I also recommend using recv, which is declared in sys/socket.h If you're stuck, always try manpages: man read.2
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Cediwelli

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