Ctrl-Z sent to Fedora server over telnet does not stop the process

问题

Objective:

I am working on an iOS terminal emulator for accessing my Unix server through the telnet protocol. I am testing against both AIX and Fedora Linux.

Problem:

If I send Ctrl-Z (ASCII 26) to the AIX server, it behaves as expected: I get back a string like stopped programname, and then any further characters I send get echoed back.

When I send it to the Fedora server, I get no echo-back until I send Ctrl-Z a second time. The program is running under Bash on the Fedora machine.

Why am I seeing this difference in behavior?

回答1:

You have to make 2 calls:

1. Stopping that process

   kill -SIGSTOP 'pgrep process_name'

2. Continuing that process

   kill -SIGCONT 'pgrep process_name'

SIGSTOP tells a process to “hold on” and SIGCONT tells a process to “pick up where you left off”

See, if that help.

来源：https://stackoverflow.com/questions/28380426/ctrl-z-sent-to-fedora-server-over-telnet-does-not-stop-the-process