PR #3691 made most calls to `signal_block()` and `signal_unblock()`
no-ops unless a magic env var is set when fish starts running. It's
been seven months since that change was made and no problems have been
reported. This finishes that work by removing those no-op function calls
and support for the magic env var in our next major release (which won't
happen till at least six months from now).
0 is not a good default PGID, because it's possible for a kernel process
to have the PGID of 0 under Linux.
This meant that job_get_from_pid could return incorrect jobs, as the PGID
for internal, non-forked jobs was the same as kernel processes.
Avoid this by using an invalid PGID as the initial PGID.
If fish is not the first process in a pipeline, and jobs are started
from the fish process, it is possible for fish and the OS to have
different ideas about what the process group of the jobs are.
This change confirms the current PGID, rather than assuming that it is
the same as the PID.
This is the next step in determining whether we can disable blocking
signals without a good reason to do so. This makes not blocking signals
the default behavior. If someone finds a problem they can add this to
their ~/config/fish/config.fish file:
set FISH_NO_SIGNAL_BLOCK 0
Alternatively set that env var before starting fish. I won't be surprised
if people report problems. Till now we have relied on people opting in
to this behavior to tell us whether it causes problems. This makes the
experimental behavior the default that has to be opted out of. This will
give us a lot more confidence this change doesn't cause problems before
the next minor release.
Note that there are still a few places where we force blocking of
signals. Primarily to keep SIGTSTP from interfering with the shell in
response to manipulating the controlling tty. Bash is more selective
in the signals it blocks around the problematic syscalls (c.f., its
`git_terminal_to()` function). However, I don't see any value in that
refinement.
The shell was doing a log of signal blocking/unblocking that hurts
performance and can be avoided. This reduced the elapsed time for a
simple benchmark by 25%.
Partial fix for #2007
Emitting warnings about EPIPE errors when writing to stdout or stderr is
more annoying than helpful. So suppress that specific warning message.
Fixes#2516
On some platforms, notably GNU libc, you cannot mix narrow and wide
stdio functions on a stream like stdout or stderr. Doing so will drop
the output of one or the other. This change makes all output to the
stderr stream consistently use the wide forms.
This change also converts some fprintf(stderr,...) calls to debug()
calls where appropriate.
Fixes#3692
If an interactive shell has its tty invalidated attempts to write to
stdout or stderr can trigger this bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=20632
Avoid that by reopening the stdio streams on /dev/null if we're getting
an ENOTTY error when trying to do things like give or take ownership of
the tty.
This includes some unrelated style cleanups but including them seems
reasonable.
Fixes#3644
Just use static_cast directly instead of inscrutible "shortcut"
macro.
It was not always used and doesn't seem to do much besides scramble
things up; encountering CAST_INIT() in the code seems likely to lead
to head scratching due to the transformation taking place.
It was added to save folks typing the type twice, now with 100
columns available, let's roll that convenience macro back.
sockaddr_dl:
Perform reinterpret_cast<sockaddr_dl> conversion. The cast affected
alignment and looks fishy to a compiler (but it's fine). Ditch
C-style cast and communicate we're doing that on purpose.
The autoconf-generated config.h contains a number of directives which
may alter the behaviour of system headers on certain platforms. Always
include it in every C++ file as the first include.
Closes#2993.
Remove the "make iwyu" build target. Move the functionality into the
recently introduced lint.fish script. Fix a lot, but not all, of the
include-what-you-use errors. Specifically, it fixes all of the IWYU errors
on my OS X server but only removes some of them on my Ubuntu 14.04 server.
Fixes#2957
This was used to cache a narrow string representation
of commands, so that if certain system calls returned errors
after fork, we could output error messages without allocating
memory. But in practice these errors are very uncommon, as are
commands that have wide characters. It is simpler to do a best-effort
output of the wide string, instead of caching a narrow string
unconditionally.
If stdio is dead due to EPIPE, there's no great reason to spew a stack dump.
This will still write an error to stderr if stdout dies. This might be
undesirable, but changing that should be considered separately.
This change moves source files into a src/ directory,
and puts object files into an obj/ directory. The Makefile
and xcode project are updated accordingly.
Fixes#1866
