But what about a process started as nohup process and detached from controlling terminal ?
It has no terminal attached, I don't think it can be called as a daemon.
Started as a nohup or not doesn't matter. Most well written daemons will explicitly ignore signals that they want to ignore and install handlers for signals that they want to receive.
But if it's detached from it's controlling terminal, it is a daemon. This is exactly what happens when you restart cron or inetd from the command line. Since you don't think that processes with no controlling terminals are daemons, what is your definition of a daemon?
Hi,
I have to write a daemon process, which performs certain operations in the background.
Now since it performs operations in the background, it should not display anything to the standard output.
The problem is that it still displays, text on standard output.
Can anyone tell me (it is... (2 Replies)
My daemon process is the child of init and init has the responsibility to remove it, once it turns zombie. But I want to ask why the daemon process which is child of init turns zombie in the first place. What measures I have to take to avoid this?
rish (1 Reply)
Hello,
I need to run a command on remote Linux using the ssh command from my local machine. I am able to execute the command on remote machine using ssh but it's behaving strangely.
The command is supposed to start a daemon process on remote linux box and the control should return back to me... (5 Replies)
Hello,
I am new to this forum and this is my first post here...
I have never worked on either Pro*C or Multithreading..Now, i have to write a Pro*C, Multithreading daemon process.. I dont know where to start.. Can anybody help me with examples?
1. need to write a Pro*C multithreading... (0 Replies)
Hi,
HI ,
I have a simple script that moves files from one folder to another folder, I have already done the open-ssh server settings and the script is working fine and is able to transfer the files from one folder to another but right now I myself execute this script by using my creditianls to... (3 Replies)
Hi,
When process listing, I came across a process running as user daemon.
daemon 23576 23574 0 07:32:04 ? 0:07 oracle (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
root 27526 27444 1 07:38:43 ttyp5 0:00 grep 23574
why a process runs as user daemon, when it should be... (3 Replies)
I wish to make a process run in the background, but only one instance of it, and not many,
so when the program is loaded, it has to check whether another instance of the same
program is running and if so to exit. How do I do this ? (4 Replies)
Discussion started by: sundaresh
4 Replies
LEARN ABOUT SUSE
tcgetsid
TCGETSID(3) Linux Programmer's Manual TCGETSID(3)NAME
tcgetsid - get session ID
SYNOPSIS
#define _XOPEN_SOURCE 500
#include <termios.h>
pid_t tcgetsid(int fd);
DESCRIPTION
The function tcgetsid() returns the session ID of the current session that has the terminal associated to fd as controlling terminal. This
terminal must be the controlling terminal of the calling process.
RETURN VALUE
When fd refers to the controlling terminal of our session, the function tcgetsid() will return the session ID of this session. Otherwise,
-1 is returned, and errno is set appropriately.
ERRORS
EBADF fd is not a valid file descriptor.
ENOTTY The calling process does not have a controlling terminal, or it has one but it is not described by fd.
VERSIONS
tcgetsid() is provided in glibc since version 2.1.
CONFORMING TO
POSIX.1-2001.
NOTES
This function is implemented via the TIOCGSID ioctl(2), present since Linux 2.1.71.
SEE ALSO getsid(2)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2008-06-14 TCGETSID(3)