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Top Forums UNIX for Beginners Questions & Answers How to check if a file is open in editor? Post 303005560 by Don Cragun on Thursday 19th of October 2017 03:56:12 PM
Old 10-19-2017
Quote:
Originally Posted by RudiC
I can't speak for gedit, but leafpad, be it sent to background or not, opens a new window with an editing session.
OK. I don't have leafpad or gedit on my system. When testing with vi (note that in post #10, the O.P. said that gedit and vi were used interchangeably), by running the command line:
Code:
vi somefile& PID=$!; sleep 10; jobs $PID; sleep 10; fg $PID

I immediately get:
Code:
vi somefile& PID=$!; sleep 10; jobs $PID; sleep 10; fg $PID
[1]	83379

and about 10 seconds later I get:
Code:
[1] + Stopped (SIGTTOU)        vi somefile& PID=$!; sleep 10; jobs $PID; sleep 10; fg $PID

noting that vi is stopped; not terminated. And about 10 seconds later, the fg $PID brings vi somefile into the foreground so I can edit somefile. When I quit vi, I then get a new shell prompt for another command.
 

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SETSID(2)						     Linux Programmer's Manual							 SETSID(2)

NAME
setsid - creates a session and sets the process group ID SYNOPSIS
#include <unistd.h> pid_t setsid(void); DESCRIPTION
setsid() creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session, the process group leader of the new process group, and has no controlling tty. The process group ID and session ID of the calling process are set to the PID of the calling process. The calling process will be the only process in this new process group and in this new session. RETURN VALUE
The session ID of the calling process. ERRORS
On error, -1 will be returned. The only error which can happen is EPERM. It is returned when the process group ID of any process equals the PID of the calling process. Thus, in particular, setsid fails if the calling process is already a process group leader. NOTES
A process group leader is a process with process group ID equal to its PID. In order to be sure that setsid will succeed, fork and exit, and have the child do setsid(). CONFORMING TO
POSIX, SVr4. SEE ALSO
setpgid(2), setpgrp(2) Linux 1.0.0 1994-08-27 SETSID(2)
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