Sponsored Content
Top Forums Programming what would happen if a process wrote to its own stdin? Post 302301985 by c_d on Sunday 29th of March 2009 04:50:52 PM
Old 03-29-2009
what would happen if a process wrote to its own stdin?

what would happen if a process wrote to its own stdin?

Code:
#include<unistd.h>
#include<fcntl.h>

int main()
{

    if((write(STDIN_FILENO,"arrgh!",6))==-1)
    {
        perror("error writing to file");
    }    

}

output:
Code:
[c_d@localhost C scratchpad]$ gcc temp.c
[c_d@localhost C scratchpad]$ ./a.out 
arrgh![c_d@localhost C scratchpad]$

apparently it wrote into its stdout...how and why? no asked to process to do so...
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

what happen when changing Hostname?

I 'm using RH 7.2 Genome in the Network Configuration I change therer are two places one for static hostname for my machine and in DNS hostname I don't know what happen when restarting my PC when connecting using dialer I can't browse the Internet also I can't use sendmail .......Server timeout... (2 Replies)
Discussion started by: atiato
2 Replies

2. Programming

Any one can tell me how this happen?

The #1 Online Store for Louis Vuitton Replicas is: http://www.opichina.com.cn. We offer Louis Vuitton Replicas and more! Whatever you call it: LV Bags, LV Replicas, Louis Vuitton Fake, Louis Vuitton Knockoffs, Louis Vuitton Bag, Louis Vuitton Purse, Louis Vuitton Wallet, Louis Vuitton Shoes,... (10 Replies)
Discussion started by: jiangyanna
10 Replies

3. UNIX for Dummies Questions & Answers

What would happen if. . .

Hi, Could someone please tell me what would happen if the following were entered into the command line: rm -i /books/*.* rm /books/* Many thanks! (3 Replies)
Discussion started by: crispy
3 Replies

4. UNIX for Advanced & Expert Users

Unix ID deleted - What happen to process

I have an unix id (AIX system) which is used to run a couple of processes. They also write some log files into a file system (that is not in the home directory of the user id, but in different location). One bad day, the id was deleted accidentally. But the home directory, files and everything... (1 Reply)
Discussion started by: cmgreat
1 Replies

5. UNIX for Dummies Questions & Answers

whats happen when we create new user

hi frndz I wanna knw exatly what happen when we create new user... which directories are created ?? which files are modified ?? thanx.... (2 Replies)
Discussion started by: luckypower
2 Replies

6. AIX

How does ITIL processing happen in AIX?

How does ITIL process is implemened in AIX? (6 Replies)
Discussion started by: AIXlearner
6 Replies

7. UNIX for Dummies Questions & Answers

What Does Happen During Boot Process? - BIOS and MBR

I'm talking about boot process in multi-boot Linux perceptive. Please tell me whether my explanation is right or wrong? If wrong, please explain. "The BIOS checks the system and loads this initial bootstrapping code into memory. This initial bootstrap code searches for an active partition... (0 Replies)
Discussion started by: f.ben.isaac
0 Replies

8. UNIX for Advanced & Expert Users

Who actually wrote Professional Linux Programming ?

Hello, Who actually wrote Professional Linux Programming of Wrox publication as there are two different sets of writers, one set consists of Jon Masters and Richard Blum and another set of writers is Neil Mathew with lots of other writers. Plz resolve it. I'm really confused. Regards.. (0 Replies)
Discussion started by: vectrum
0 Replies

9. Shell Programming and Scripting

Crontab - wrote Simple Script but i cant work out how to play it at a certain time.

Hi everyone. Silly might be silly be I'm still new to bash. I'm trying to make an Alarm Clock for in the morning using my laptop i have wrote this Simple Script but i cant work out how to play it at a certain time. #!/bin/bash cd /home/josh/Music/Bruno_Mars/Hooligans/ cvlc... (8 Replies)
Discussion started by: jtsmith90
8 Replies

10. What is on Your Mind?

Ah, the AMIGA, (another poem I wrote in 2005).

Well I wrote this in 2005 and uploaded to AMINET.as a commemoration of a machine that is still in use today. It is now 29 years since this machne came into being. Phenominal and it is still being supported- WOW! My A1200 is on 24/7 and I use it to test code developed on AMIGA emulators... ... (0 Replies)
Discussion started by: wisecracker
0 Replies
GnuPG::Handles(3pm)					User Contributed Perl Documentation				       GnuPG::Handles(3pm)

NAME
GnuPG::Handles - GnuPG handles bundle SYNOPSIS
use IO::Handle; my ( $stdin, $stdout, $stderr, $status_fh, $logger_fh, $passphrase_fh, ) = ( IO::Handle->new(), IO::Handle->new(), IO::Handle->new(), IO::Handle->new(), IO::Handle->new(), IO::Handle->new(), ); my $handles = GnuPG::Handles->new ( stdin => $stdin, stdout => $stdout, stderr => $stderr, status => $status_fh, logger => $logger_fh, passphrase => $passphrase_fh, ); DESCRIPTION
GnuPG::Handles objects are generally instantiated to be used in conjunction with methods of objects of the class GnuPG::Interface. GnuPG::Handles objects represent a collection of handles that are used to communicate with GnuPG. OBJECT METHODS
Initialization Methods new( %initialization_args ) This methods creates a new object. The optional arguments are initialization of data members. hash_init( %args ). OBJECT DATA MEMBERS
stdin This handle is connected to the standard input of a GnuPG process. stdout This handle is connected to the standard output of a GnuPG process. stderr This handle is connected to the standard error of a GnuPG process. status This handle is connected to the status output handle of a GnuPG process. logger This handle is connected to the logger output handle of a GnuPG process. passphrase This handle is connected to the passphrase input handle of a GnuPG process. command This handle is connected to the command input handle of a GnuPG process. options This is a hash of hashrefs of settings pertaining to the handles in this object. The outer-level hash is keyed by the names of the handle the setting is for, while the inner is keyed by the setting being referenced. For example, to set the setting "direct" to true for the filehandle "stdin", the following code will do: # assuming $handles is an already-created # GnuPG::Handles object, this sets all # options for the filehandle stdin in one blow, # clearing out all others $handles->options( 'stdin', { direct => 1 } ); # this is useful to just make one change # to the set of options for a handle $handles->options( 'stdin' )->{direct} = 1; # and to get the setting... $setting = $handles->options( 'stdin' )->{direct}; # and to clear the settings for stdin $handles->options( 'stdin', {} ); The currently-used settings are as follows: direct If the setting "direct" is true for a handle, the GnuPG process spawned will access the handle directly. This is useful for having the GnuPG process read or write directly to or from an already-opened file. SEE ALSO
GnuPG::Interface, perl v5.12.4 2009-04-21 GnuPG::Handles(3pm)
All times are GMT -4. The time now is 03:41 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy