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Top Forums Shell Programming and Scripting Linux csh script going to Suspended (tty output) when running with & (bg) Post 302912349 by Corona688 on Thursday 7th of August 2014 12:22:09 PM
Old 08-07-2014
No, don't do that!

Reading from the controlling terminal gets it frozen. Writing is usually okay.
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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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