system('foo &', 'bar'): Show error, don't crash. #5502
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These tests are essentially affirming a regression vs Vim. In Vim,
:echo system('cat - &', 'foo')
returns "foo", because Vim internally wraps the command with shell-specific
syntax to redirect the streams from /dev/null[1].
That can't work in Nvim because we use pipes directly (instead of temp files)
and don't wrap the command with shell-specific redirection syntax.
References neovim#3529
References neovim#5241
[1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_03_02
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Closes neovim#3529 Closes neovim#5241 In Vim, :echo system('cat - &', 'foo') works because for both system() and :! Vim writes input to a temp file and uses shell syntax to redirect the file to the backgrounded `cat` (get_cmd_output() .. make_filter_cmd()). In Nvim, :echo system('cat - &', 'foo') fails because we write the input directly via pipes (shell.c:do_os_system()), but (per POSIX[1]) backgrounded process input stream is redirected from /dev/null (unless overridden by shell redirection; supported only by some shells [2]), so our writes are ignored, the process exits quickly, and if we are writing data larger than the buffer size we'll see EPIPE. This still works: :%w !tee > foo1358.txt & but this does not: :%w !tee foo1358.txt & though it *should* (why doesn't it?) because we still do the temp file dance in do_bang() .. do_filter(). [1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_03_02 [2] http://unix.stackexchange.com/a/71218
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FEATURES: 0b5a7e4 neovim#4432 API: external UIs can render custom popupmenu c6ac4f8 neovim#4934 API: call any API method from vimscript 31df051 neovim#4568 API: nvim_call_atomic(): multiple calls in a single request b268ba3 neovim#5424 API: nvim_win_get_number(), nvim_tabpage_get_number() e7e2844 has("nvim-1.2.3") checks for a specific Nvim version 522b885 neovim#5295, neovim#5493 `:CheckHealth` checks tmux, terminfo, performance 719dae2 neovim#5384 events: allow event processing in getchar() f25797f neovim#5386 API: metadata: Nvim version & API level 22dfe69 neovim#5389 API: metadata: "since", "deprecated_since" 605e743 Added QuickFixLine highlight group CHANGES: 4af6ec7 neovim#5253 perf: Disable clipboard in do_cmdline() 6e9f329 neovim#5299 perf: Skip foldUpdate() in insert-mode. 9d4fcec neovim#5426 perf: Do not auto-update folds for some foldmethods. eeec0ca neovim#5419 tui: Default to normal-mode cursor shape. FIXES: e838452 neovim#5436 tui: Fix "weird characters" / "bleeding termcodes" 10a54ad neovim#5243 signal_init: Always unblock SIGCHLD. bccb49b neovim#5316 eval.c: Fix memory leak for detached pty job 626065d neovim#5227 tchdir: New tab should inherit CWD. cd321b7 neovim#5292 getcwd(): Return empty string if CWD is invalid. 6127eae shada: Fix non-writeable ShaDa directory handling ca65514 neovim#2789 system(): Respect shellxescape, shellxquote 2daf54e neovim#4874 Restore vim-like tab dragging 0c536b5 neovim#5319 syntax.c: Support bg/fg special color-names. 3c53371 neovim#4972 from justinmk/schedule-ui_refresh 68bcb32 neovim#4789 tui.c: Do not wait for tui loop on teardown. c8b6ec2 neovim#5409 v:count broken in command-line window 6bc3bce neovim#5461 fix emoji display 51937e1 neovim#5470 fix :terminal with :argadd, :argu 79d77da neovim#5481 external UIs: opening multiple files from command-line 657ba62 neovim#5501 rplugin: resolve paths in manifest file 6a6f188 neovim#5502 system('foo &', 'bar'): Show error, don't crash. 1ff162c neovim#5515 os_nodetype: open fd with O_NONBLOCK 2a6c5bb neovim#5450 modeline: Handle version number overflow. 0ade1bb neovim#5225 CI tests now run against Windows!
justinmk
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FEATURES: 0b5a7e4 neovim#4432 API: external UIs can render custom popupmenu c6ac4f8 neovim#4934 API: call any API method from vimscript 31df051 neovim#4568 API: nvim_call_atomic(): multiple calls in a single request b268ba3 neovim#5424 API: nvim_win_get_number(), nvim_tabpage_get_number() e7e2844 has("nvim-1.2.3") checks for a specific Nvim version 522b885 neovim#5295, neovim#5493 `:CheckHealth` checks tmux, terminfo, performance 719dae2 neovim#5384 events: allow event processing in getchar() f25797f neovim#5386 API: metadata: Nvim version & API level 22dfe69 neovim#5389 API: metadata: "since", "deprecated_since" 605e743 Added QuickFixLine highlight group CHANGES: 4af6ec7 neovim#5253 perf: Disable clipboard in do_cmdline() 6e9f329 neovim#5299 perf: Skip foldUpdate() in insert-mode. 9d4fcec neovim#5426 perf: Do not auto-update folds for some foldmethods. eeec0ca neovim#5419 tui: Default to normal-mode cursor shape. FIXES: e838452 neovim#5436 tui: Fix "weird characters" / "bleeding termcodes" 10a54ad neovim#5243 signal_init: Always unblock SIGCHLD. bccb49b neovim#5316 eval.c: Fix memory leak for detached pty job 626065d neovim#5227 tchdir: New tab should inherit CWD. cd321b7 neovim#5292 getcwd(): Return empty string if CWD is invalid. 6127eae shada: Fix non-writeable ShaDa directory handling ca65514 neovim#2789 system(): Respect shellxescape, shellxquote 2daf54e neovim#4874 Restore vim-like tab dragging 0c536b5 neovim#5319 syntax.c: Support bg/fg special color-names. 3c53371 neovim#4972 from justinmk/schedule-ui_refresh 68bcb32 neovim#4789 tui.c: Do not wait for tui loop on teardown. c8b6ec2 neovim#5409 v:count broken in command-line window 6bc3bce neovim#5461 fix emoji display 51937e1 neovim#5470 fix :terminal with :argadd, :argu 79d77da neovim#5481 external UIs: opening multiple files from command-line 657ba62 neovim#5501 rplugin: resolve paths in manifest file 6a6f188 neovim#5502 system('foo &', 'bar'): Show error, don't crash. 1ff162c neovim#5515 os_nodetype: open fd with O_NONBLOCK 2a6c5bb neovim#5450 modeline: Handle version number overflow. 0ade1bb neovim#5225 CI tests now run against Windows!
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Closes #3529 and #5241, though unfortunately the plugin mentioned in those issues probably won't work correctly after this change: that plugin uses "&" to approximate async behavior. It would be trivial to update the plugin to use
jobstart()instead.In Vim,
works because for both system() and :! Vim writes input to a temp file and uses
shell syntax to redirect the file to the backgrounded
cat(get_cmd_output().. make_filter_cmd()).
In Nvim,
fails because we write the input directly via pipes (shell.c:do_os_system()),
but (per POSIX[1]) backgrounded process input stream is redirected from
/dev/null (unless overridden by shell redirection; supported only by some shells
[2]), so our writes are ignored, the process exits quickly, and if we are
writing data larger than the buffer size we'll see EPIPE.
Side note: This still works:
but this does not:
though it should (why doesn't it?) because we still do the temp file dance
in do_bang() .. do_filter().
[1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_03_02
[2] http://unix.stackexchange.com/a/71218