realpath() will return NULL and sets errno if it fails.
We asserted that realpath(".") does not fail. We also didn't really
check that it was successful. Made sure we'll get a perror telling
us about what went wrong if something like this happens again.
Updated tests and added test case
Fixes#5351
If fish detects that it was started with a pgrp of 0 (which appears to
oddly be the case when run under firejail), create new process group for
fish and give it control of the terminal.
This selectively reverts 55b3c45 in cases where an invalid pgrp is
detected. Note that this is known to cause problems in other cases, such
as #3805 and Microsoft/WSL#1653, although the former may have been
ameliorated or even addressed by the recent job control overhaul, so
that's why we are careful to only assign fish to its own pgroup if an
invalid pgroup was detected and not as the normal case.
This reverts commit 54050bd4c5.
Type job_list_t was changed from a list to a deque in
commit 54050bd4c5.
In process_clean_after_marking(), we remove jobs while iterating.
dequeues do not support that. Make it a list again.
This fixes the `~floam/` case, where the out_tail_idx pointer needs to
point to the "/", not the last letter.
The `~/` and `~floam` cases still work.
Unfortunately, I'm unsure of how to test this.
Fixes#5325.
Limit the fish_wcstod fast path to ASCII digits only, to fix the problem
observed in the discussion for a700acadfa
where LANG=de_DE.UTF-8 would cause `test` to interpret commas instead of
periods inside floating point values.
Now jobs are aware of their parent jobs, and can interrogate those jobs,
to determine if every job in the chain is fully constructed.
Remove flags and the static stacks that manipulated them.
The parent of a job is the parent pipeline that executed the function or
block corresponding to this job. This will help simplify
process_mark_finished_children().
Prior to this fix, cding into a symlink and then completing .. would complete
from the physical directory instead of the logical directory, which could not
actually be cd'd to. Teach cd completiond to use the logical directory.
select_try() returned IO_ERROR to indicate that there's no file descriptors
from which to read. Name this return value properly.
Also migrate this type into proc.cpp since it's not used outside of the
header.
This is an opposite case from the usual "pipe into grep-the-function"
where my `pbpaste` emitted a lot of content exceeding the OS pipe
buffer. The `block_on_fg` condition was just `send_sigcont` in the
original job control rewrite, and it was incorrect to sub it for
WAIT_BY_PROCESS on its own.
However, this requires always blocking when select_try returns an
interrupted/incomplete read or else fish doesn't block and stays running
in a tight loop in the background (and incorrectly writing to a terminal
it doesn't own under higher debug levels), which I *think* is OK.
Instantiate the std:locale instance used within the character comparison
callback outside the lambda and take a reference to it instead of
creating the locale object for each character in the sequence.
This is part of a very tight loop with lots of inputs during the
evaluation of fuzzy string matches for completions/autosuggestions and
is worth optimizing.
This was introduced in 1b1bc28c0a but did
not cause any problems until the job control refactor, which caused it
to attempt to signal the calling `exec` builtin's own (invalid) pgrp
with SIGHUP.
Also improved debugging for `j->signal()` failures by printing the
signal we tried sending in case of error, rename the function to
`hup_background_jobs`, and move it from `reader.h`/`reader.cpp` to
`proc.h`/`proc.cpp`.
When a function is encountered by exec_job, a new context is created for
its execution from the ground up, with a new job and all, ultimately
resulting in a recursive call to exec_job from the same (main) thread.
Since each time exec_job encounters a new job with external commands
that needs terminal control it creates a new pgrp and gives it control
of the terminal (tcsetpgrp & co), this effectively takes control away
from the previously spawned external commands which may be (and likely
are) expecting to still have terminal access.
This commit attempts to detect when such a situation arises by handling
recursive calls to exec_job (which can only happen if the pipeline
included a function) by borrowing the pgrp from the (necessarily still
active) parent job and spawning new external commands into it.
When a parent job spawns new jobs due to the evaluation of a new
function (which shouldn't be the case in the first place), we end up
with two distinct jobs sharing one pgrp (to fix#3952). This can lead to
early termination of a pgrp if finished parent job children are reaped
before future processes in either the parent or future child jobs can
join it.
While the parent job is under construction, require that waitpid(2)
calls for the child job be done by process id and not job pgrp.
Closes#3952.
Use SIGCHLD to determine whether or not waitpid(2) calls can be elided,
but only with extreme caution. If we receive SIGCHLD but are not able to
reap all jobs, we need to iterate through them again.
For this to work, we need to make sure that we reap all children that we
can reap after a SIGCHLD, i.e. it's not OK to just reap the first and
return or else we can never clear the dirty state flag.
In all cases, as expensive as a call to waitpid() may be, if a child
process is available for reaping it is always cheaper to wait on it then
reap it than to call select_try() and end up timing out.
The old code was rather haphazard with regards to error control, and
would make mutable changes before operations that could fail without any
viable error handling options.
Convert `select_try()` to return a well-defined enum describing its
state, and handle each of the three possible cases with clear reasons
why we are blocking or not blocking in each subsequent call to
`process_mark_finished_children()`.
* Use the newly-introduced signal_block_t RAII wrapper
* Remove EINTR loops as all signals are blocked
* Clean up control flow thanks to RAII wrappers
* Rename parameter to clarify what it does and update docs accordingly
* Update outdated comments referencing SIGSTOP code that was removed a
long time ago.
* Remove no-op CHECK_BLOCK() call
