In D29493#661261, @bapt wrote:

@jilles do you think we should add an option to disable the load and save so people willing to have a giant history while not suffering from the load/save can do it? if yes do you have any options to suggest?

Note that this can still be overridden via $EDITRC, ~/.editrc or a bind command after set -o emacs.

Another nice feature, but I expect that making it good enough to replace bigger shells will take more work. For example, the save-all/load-all approach may be rather slow with the number of history entries I personally like to keep.

Nice feature.

Perhaps it makes more sense to implement this as a separate program that performs setsid() and then execvp(). This is a bit like daemon, but not quite, since daemon also forks and makes it hard to track the child process. As noted in the man page, sh tends not to implement many extensions. Extensions like set -o trapsasync and set -o pipefail are different from this one because they are hard to implement outside the shell or in a shell script. Of these, set -o pipefail is particularly simple to implement in the shell.

This was reported before as https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218598 but I did not know for sure what to do so I left it alone. Since the patch is essentially the same, perhaps we should make this change. The wording of the error message in the patch in the PR seems a bit more formal, so better.

In D27310#610450, @kib wrote:

I do not see this EINTR and EINPROGRESS change in the most recent version of POSIX I have, IEEE Std 1003.1™-2017.

The referenced austin group ticket even went as far as propose posix_close() with some retry flag, which again was not added. More, there were strong objections from Linux side arguing that EINTR behavior should be as it is de-facto implemented by Linux and FreeBSD: file is always closed.

Restarting a close() would indeed be very bad, but returning [EINTR] might cause userland to do the same.

Having this kind of possibly mysterious errors documented is very useful.

My suggestion is to change all the exit statuses that were changed to sysexits codes here to 2 instead.

In D27216#607710, @gbe wrote:

In D27216#607705, @jilles wrote:

A pthread implementation "libc_r" was already added in 2.2-release, which contained most of these functions.

A pthread implementation "libc_r" was already added in 2.2-release, which contained most of these functions.

Exit statuses should implement a protocol between the calling and called process. Since only 8 bits (or 32 if the calling process uses waitid()) are available, there is not much flexibility. I think distinctions between different exit statuses should have a purpose, while most of the sysexits codes categorize errors without a clear purpose. If more flexibility is needed, a channel with more capacity should be used.

This complies to https://www.austingroupbugs.net/bug_view_page.php?bug_id=508 which is planned for POSIX issue8 (in a few years).

Perhaps it is better to match sockstat (D26413) and make the option -C instead of -c.

I found a reason to touch this code, but otherwise I'm a bit surprised about a change here.

This change may cause breakage in setups where the chroot does not have /etc/pwd.db and related files. Given that chroot(8) has worked like this since 2003, why change it now?

I think the best way forward is to start with -@ first and leave -l output as it is, at first.

Since struct timeval is mostly obsoleted by struct timespec, I suggest adding this only when there is existing code using it.

In D25033#551601, @kevans wrote:

In D25033#551509, @jilles wrote:

The dup2 part looks good.

The dup2 part looks good.

Although there is nothing wrong with this per se, applications can deal with this problem more easily using getline(3) (which is also standard).

read(2) on a directory seems only useful for educational or debugging purposes. These purposes are better served by a different API.

Feel free to commit this revision as is. I will handle -h in mkbuiltins.

A follow-up is to delete -h from mkbuiltins and builtins.def.

This solution looks inconsistent. Either fc and bind are always available (writing an error message if history is not compiled in), in which case mkbuiltins should not be omitting them, or they are not available if history is not compiled in, in which case the functions should not be defined at all if history is not compiled in.

Disabling utx boot and utx shutdown does not prevent other parts of the system writing to the utx files. So by itself this disable creates utx files that are less useful. Disabling utx completely needs patching, at least the way things are now.

Some people wrongly add whitespace via copy and paste, but let's be consistent with login, passwd, etc.

Fine with me, assuming it still builds with recent GCC as well.

MAINTAINERS says openssh is maintained by des, who accepts reviews via email only (no phabricator).

In D23802#523379, @kib wrote:

The buffer was written by the function, this is my point of the aliasing breakage.

The bin/sh part looks OK.

What is the point of fputc_unlocked() given that putc_unlocked() already exists?

Hmm, https://reviews.freebsd.org/D17083 proposes to change qsort_r() argument order to glibc's since that is likely to become POSIX standard and is slightly better than our order.