Keep connection alive between PC and board Post: 302915331

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Top Forums Shell Programming and Scripting Keep connection alive between PC and board Post 302915331 by gull04 on Tuesday 2nd of September 2014 10:34:10 AM

09-02-2014

Registered User

OK,

Then both the following options would be open to you, you should choose the one that suits your requirements.

For the tcp keep alive,

This normally will keep the session alive when there is no interaction i.e. no keystrokes in e terminal session or screen traffic. It is normally set as seconds - so it seems to be currently set to 75 seconds. You should check the acceptable parametesr and adjust to suit your requirements, within the parameters if you can.

Nohup is something different;

It is normally used to run something from a terminal session, but gives the flexibility to disconnect the session without the process dying as well - however if there is output required from the script it should go to some kind of log file.

Normally used as follows - but without the quotes.

Code:

user $> nohup "my/script/is/here > "my/logfile/is/here" 2>&1

Although you may wish to handle logging and error loging in the script.

Regards

Dave

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tcgetsid

TCGETSID(3)						     Linux Programmer's Manual						       TCGETSID(3)

NAME

       tcgetsid - get session ID

SYNOPSIS

       #define _XOPEN_SOURCE 500	/* See feature_test_macros(7) */
       #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 3.53 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
								    2010-09-10							       TCGETSID(3)