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| author | Denys Vlasenko | 2014-05-11 00:00:52 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2014-05-11 00:00:52 +0200 |
| commit | 539e2802ebd2680602de0a2c76069b7f555392d9 (patch) | |
| tree | 9a26e2e784b9f34d309bb4c7939762b4501ed0b7 | |
| parent | 62a40a044805ea1be7bb01b3408a38292823297e (diff) | |
| download | busybox-539e2802ebd2680602de0a2c76069b7f555392d9.zip busybox-539e2802ebd2680602de0a2c76069b7f555392d9.tar.gz | |
getty: explain when setsid() fails. no code changes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | loginutils/getty.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/loginutils/getty.c b/loginutils/getty.c index 0f060ae..4b1b73b 100644 --- a/loginutils/getty.c +++ b/loginutils/getty.c @@ -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, |