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Background Process in UNIX

BuckGup
By BuckGup
in Programming
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I'm making a shell in C, yet again lol, and I need to background a process like how a standard bash terminal normally would. I know I need to use sigset(), sigaction(), and maybe SIGTTOU but I'm not really sure where to start. I was thinking just look at the whole string that is input and if it has "&" then fork the process and put it in the background. I'm not sure how you actually put something in the background though in C. Any info would help. Thanks

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Just keeping this here as a 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3 minutes ago, BuckGup said:

I'm making a shell in C, yet again lol, and I need to background a process like how a standard bash terminal normally would. I know I need to use sigset(), sigaction(), and maybe SIGTTOU but I'm not really sure where to start. I was thinking just look at the whole string that is input and if it has "&" then fork the process and put it in the background. I'm not sure how you actually put something in the background though in C. Any info would help. Thanks

i dont know any of this, but what the fuck is that signature tho xD

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Just now, JayBe said:

i dont know any of this, but what the fuck is that signature tho xD

It's art

▓ƆԀ▓ S▓₱▓Ɇ▓c▓s▓: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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21 minutes ago, BuckGup said:

I'm making a shell in C, yet again lol, and I need to background a process like how a standard bash terminal normally would. I know I need to use sigset(), sigaction(), and maybe SIGTTOU but I'm not really sure where to start. I was thinking just look at the whole string that is input and if it has "&" then fork the process and put it in the background. I'm not sure how you actually put something in the background though in C. Any info would help. Thanks

UNIX or Linux? At least the following works fine under Linux with gcc: 

#include <sys/types.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

void main()
{
        printf("Forking a child-process.\n");
        pid_t pid;
        if((pid = fork()) == 0){
                if(setsid() != -1){
                        printf("Child here!\n");
                        //Keep child-process running for a bit
                        sleep(30);
                        printf("Child exiting!\n");
                        }
        }
}

 

Hand, n. A singular instrument worn at the end of the human arm and commonly thrust into somebody’s pocket.

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Here's a start: https://www.gnu.org/software/libc/manual/html_node/Using-Pause.html

 

Obviously daemons are usually not that simple, and are often multi-thread or multi-process (forking) systems. But this should be enough for the thread that listens for OS signals for starters at least.

 

Graceful shutdown is the harder part of the daemonization IMO. Harder to do properly that is.

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1 hour ago, BuckGup said:

I was thinking just look at the whole string that is input and if it has "&" then fork the process and put it in the background. I'm not sure how you actually put something in the background though in C.

The problem with that is that it's hard to put the process back in the foreground if the user wants to. It's a start though.

Don't ask to ask, just ask... please 🤨

sudo chmod -R 000 /*

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50 minutes ago, Sauron said:

The problem with that is that it's hard to put the process back in the foreground if the user wants to. It's a start though.

I'm not actually sure how to do that anyways. Isn't it a special keyboard command to page through background processes like ctrl+shift+x or something? 

 

I've since found a good example on GeeksforGeeks 

// Function where the piped system commands is executed 
void execArgsPiped(char** parsed, char** parsedpipe) 
{ 
	// 0 is read end, 1 is write end 
	int pipefd[2]; 
	pid_t p1, p2; 

	if (pipe(pipefd) < 0) { 
		printf("\nPipe could not be initialized"); 
		return; 
	} 
	p1 = fork(); 
	if (p1 < 0) { 
		printf("\nCould not fork"); 
		return; 
	} 

	if (p1 == 0) { 
		// Child 1 executing.. 
		// It only needs to write at the write end 
		close(pipefd[0]); 
		dup2(pipefd[1], STDOUT_FILENO); 
		close(pipefd[1]); 

		if (execvp(parsed[0], parsed) < 0) { 
			printf("\nCould not execute command 1.."); 
			exit(0); 
		} 
	} else { 
		// Parent executing 
		p2 = fork(); 

		if (p2 < 0) { 
			printf("\nCould not fork"); 
			return; 
		} 

		// Child 2 executing.. 
		// It only needs to read at the read end 
		if (p2 == 0) { 
			close(pipefd[1]); 
			dup2(pipefd[0], STDIN_FILENO); 
			close(pipefd[0]); 
			if (execvp(parsedpipe[0], parsedpipe) < 0) { 
				printf("\nCould not execute command 2.."); 
				exit(0); 
			} 
		} else { 
			// parent executing, waiting for two children 
			wait(NULL); 
			wait(NULL); 
		} 
	} 
}

I'm just not sure how the input works exactly 

▓ƆԀ▓ S▓₱▓Ɇ▓c▓s▓: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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Posted
6 minutes ago, BuckGup said:

I'm not actually sure how to do that anyways. Isn't it a special keyboard command to page through background processes like ctrl+shift+x or something? 

If you have a process running in the background on a bash shell you can type 

fg

to bring it in the foreground and hit ctrl+z to put it in the background again.

Don't ask to ask, just ask... please 🤨

sudo chmod -R 000 /*

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