控制终端

controlling terminal

• man 4 tty
• https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/basedefs/V1_chap03.html#tag_03_115
• https://linuxdev.cc/article/a0hduu.html
• https://labex.io/lesson/controlling-terminal?learn=true (好玩的)

ps -o pid,tty

PID TT
   4187 pts/1
   4957 pts/1

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session leader open tty 设备 时 (肯定不包括 /dev/tty 啦), 若未指定 O_NOCTTY 标志, 内核就会将该终端绑定为该会话的 controlling tty.