Simple command line programs like cat or vi cat just stop working with
an error: "Resource temprorarily unavailable". Busybox does not clear the
NONBLOCK flag from stdin when it is in the foreground.
fcntl(2) says:
File status flags
Each open file description has certain associated status flags,
initialized by open(2) and possibly modified by fcntl(). Duplicated
file descriptors (made with dup(2), fcntl(F_DUPFD), fork(2), etc.)
refer to the same open file description, and thus share the same file
status flags.
This means that the programs you start from the command line, inheriting the
shell's stdin/out/err can influence them, and by extension, influence all
further programs to be launched.
Adam Endrodi(1):
ash: clear the NONBLOCK flag from stdin when in foreground
shell/ash.c | 36 +++++++++++++++++++++++++++++++++++-
1 files changed, 35 insertions(+), 1 deletions(-)
--
1.7.2.5
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