539e2802e
Denys Vlasenko
2014-05-11
Subject
getty: explain when setsid() fails. no code changes
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loginutils/getty.c+10 -0
| @@ -556,6 +556,16 @@ int getty_main(int argc UNUSED_PARAM, char **argv) | |
| // pid, getppid(), | |
| // getsid(0), getpgid(0)); | |
| bb_perror_msg_and_die("setsid"); | |
| + | /* |
| + | * When we can end up here? |
| + | * Example: setsid() fails when run alone in interactive shell: |
| + | * # getty 115200 /dev/tty2 |
| + | * because shell's child (getty) is put in a new process group. |
| + | * But doesn't fail if shell is not interactive |
| + | * (and therefore doesn't create process groups for pipes), |
| + | * or if getty is not the first process in the process group: |
| + | * # true | getty 115200 /dev/tty2 |
| + | */ |
| } | |
| /* Looks like we are already a session leader. | |
| * In this case (setsid failed) we may still have ctty, | |