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Top Forums Programming How to find if a process a daemon ? Post 302218822 by matrixmadhan on Sunday 27th of July 2008 05:34:54 AM
Old 07-27-2008
Code:
Daemons have no controlling terminal.
Non-daemons have a controlling terminal.

Agreed.
ppid doesn't matter.

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.
 

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tcgetsid(3C)															      tcgetsid(3C)

NAME
tcgetsid() - get terminal session ID SYNOPSIS
DESCRIPTION
The function returns the value of the session ID of the foreground process associated with the terminal referenced by fildes. is allowed from a process that is a member of a background process group (see termio(7)). RETURN VALUE
Upon successful completion, returns the value of the session ID of the foreground process associated with the terminal referenced by fildes. Otherwise, returns a value of and sets to indicate the error. ERRORS
If the function fails, it sets (see errno(2)) to one of the following values: [EACCES] The file associated with fildes is the controlling terminal of the calling process; however, there is no foreground process group defined for the controlling terminal. [EBADF] fildes is not a valid file descriptor. [ENOTTY] The file associated with fildes is not the controlling terminal or the calling process does not have a controlling terminal. SEE ALSO
getsid(2), setsid(2), tcgetpgrp(3C), thread_safety(5). tcgetsid(3C)
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