Flock utility and crontab script

Installing and Using OpenWrt
1

Can anyone enlighten me on the "flock" package in collaboration with "crontab"( options and whether the solution found may be valid), I would like to make sure that a script is executed every minute

cat /etc/crontab/root

#min hour day month day-week command
#0-59 0-23 1-31 1-12 0-6(0=Sunday) exec
* * * * * flock -n /tmp/wan_connect.lock /root/wan_connect

the script checks if there is an internet connection and if it is missing it reconnects it (if necessary just ask and I will also add the script in question)

and sorry if the question may be really stupid...

see these attachments:

2

Install a desktop linux and read the manual page?

1 Like
3

the utility is already present in my debian system

as far as the man page is concerned it can also be found on the internet

https://manpages.debian.org/testing/util-linux/flock.1.en.html

but perhaps my question has been misunderstood, is the way I chose correct or is there a better way?

4

Depends on what you are trying to accomplish. Probably just look into ifup script.

5

I would like to avoid that the script remains blocked for some reason and that there can only be one instance of the script running

6

Auto translation does not work.
Please examine ifup script which can be called at any rate.

1 Like
7

I'm sorry but I don't see what you think is simple and/or clear

maybe I'm very stupid... but I don't see a possible solution here

cat /sbin/ifup

#!/bin/sh

ifup_all=

if_call() {
        local interface="$1"
        for mode in $modes; do
                ubus call network.interface $mode "{ \"interface\" : \"$interface\" }"
        done
}

case "$0" in
        *ifdown) modes=down;;
        *ifup)
                modes="down up"
        ;;
        *) echo "Invalid command: $0";;
esac

while :; do
        case "$1" in
                -a)
                        ifup_all=1
                        shift
                ;;
                *)
                        break
                ;;
        esac
done

[ "$modes" = "down up" ] && ubus call network reload
if [ -n "$ifup_all" ]; then
        for interface in $(ubus -S list 'network.interface.*'); do
                if_call "${interface##network.interface.}"
        done
        exit
else
        ubus -S list "network.interface.$1" > /dev/null || {
                echo "Interface $1 not found"
                exit
        }
        if_call "$1"
fi
8

Auto translation does not work

9

This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.