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How to use System functions in c++ on linux


How to use System functions in c++ on linux

By : user2953997
Date : November 21 2020, 07:31 AM
I think the issue was by ths following , You use system just like any other function. The only caveat is that the command you are executing must be available on the system your application is running on and within the same context your application is being executed.
code :
int main()
{
    system("color 4a");
}


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Different results on each system using file functions in C. Linux vs. Mac

Different results on each system using file functions in C. Linux vs. Mac


By : Nguyễn
Date : March 29 2020, 07:55 AM
it should still fix some issue There are 4 bytes allocated for numberSring. Who knows what character immediately follows the last one. There is a possibility that it looks like a digit. Make it numberString[5] and initialize numberString[4] = 0, to tell strtol where to stop.
Linux system calls vs C lib functions

Linux system calls vs C lib functions


By : user3145034
Date : March 29 2020, 07:55 AM
it helps some times First, understand that that C functions and system calls are two completely different things.
System calls not wrapped in the C library must be called through the syscall function. One example of such a call is gettid.
code :
#define _GNU_SOURCE
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

pid_t gettid(void)
{
    pid_t tid = (pid_t)syscall(SYS_gettid);
    return tid;
}
If I am writing a C program for an embedded system that has linux running on it, how would the functions and libraries u

If I am writing a C program for an embedded system that has linux running on it, how would the functions and libraries u


By : clheang
Date : March 29 2020, 07:55 AM
around this issue I am trying to understand how our application writing process changes when we have linux on the microprocessor/microcontroller i.e an operating system running in it. As far as I can see we still have the same old stdio.h and void main in the applications I have seen so far. What is Linux doing in the background? How do we make linux run our application as soon as it has booted? What do we make Linux do in these programs? I mean we can still open and close files and write to LCDs regardles of Linux right? , C distinguishes two modes "freestanding" and "hosted":
How to get system time with NASM assembly in Linux without using functions exported from C?

How to get system time with NASM assembly in Linux without using functions exported from C?


By : Gary Mitchell
Date : March 29 2020, 07:55 AM
will be helpful for those in need As Jester pointed out Jpowel answered a similar question. JPowel provided an answer that works for 32-bit and 64-bit. The compatibility (on 64-bit Linux) of calling through int 0x80 has a small amount of additional overhead associated with it. The 64-bit specific method is to use the 64-bit instruction SYSCALL to the sys_time kernel routine. Linux sys_time manpage is here. It defines sys_time as:
Are Unix/Linux system calls part of POSIX library functions?

Are Unix/Linux system calls part of POSIX library functions?


By : Carmine
Date : March 29 2020, 07:55 AM
Hope this helps Linux system calls are listed in syscalls(2). Most are POSIX, but some are specific to Linux (e.g. signalfd(2), etc...). POSIX is a specification and does not "know" about syscalls (which, in the POSIX view, are an implementation detail).
Some functions are standardized in POSIX but implemented in Linux library code, e.g. dlopen(3) (see POSIX dlopen) built above mmap(2)...
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