Re: difference in seconds between two formatted dates ...

[Albretch Mueller <lbrtchx@gmail.com>]

On 12/26/23, Greg Wooledge <greg@wooledge.org> wrote:
> If you want to launch a SIMPLE BACKGROUND PROCESS (note the SIMPLE here,
> this is IMPORTANT), and then strace it while it runs, you'd do it like
> this:
>
>     ping www.google.fr -c 4 &
>     pid=$!
>     strace -p "$pid"
>     wait "$pid"

 I am getting an "Operation not permitted" error while strace tries to
attach to that pid:

 "strace: attach: ptrace(PTRACE_SEIZE, 52527): Operation not permitted"


$   ping www.google.fr -c 4 &
    pid=$!
    strace -p "$pid"
    wait "$pid"
[1] 52527
strace: attach: ptrace(PTRACE_SEIZE, 52527): Operation not permitted
PING www.google.fr (64.233.185.94) 56(84) bytes of data.
64 bytes from yb-in-f94.1e100.net (64.233.185.94): icmp_seq=1 ttl=55
time=54.2 ms
64 bytes from yb-in-f94.1e100.net (64.233.185.94): icmp_seq=2 ttl=55
time=61.3 ms
64 bytes from yb-in-f94.1e100.net (64.233.185.94): icmp_seq=3 ttl=55
time=60.5 ms
64 bytes from yb-in-f94.1e100.net (64.233.185.94): icmp_seq=4 ttl=55 time=125 ms

--- www.google.fr ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 54.240/75.219/124.823/28.769 ms
[1]+  Done                    ping www.google.fr -c 4
$