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Full Discussion: ps: no controlling terminal
Top Forums Shell Programming and Scripting ps: no controlling terminal Post 302153692 by porter on Wednesday 26th of December 2007 06:21:33 AM
Old 12-26-2007
Quote:
Originally Posted by sriram003
ps: no controlling terminal
You are going to hate this answer, but it means that process running "ps" has no controlling terminal.

An interactive session has a controlling terminal that is used to deliver Ctrl-C, hangups and basic job control among other things.

Background tasks should not really be associated with a controlling terminal because they are not interactive.
 

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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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