handle EINTR by retrying waitpid (bug in python < 3.5) #292
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Thanks for the contribution @mjmvisser. Your change + a test are on the release-1.2 branch and will go out when it ships. |
This was referenced Nov 27, 2016
This was referenced Dec 1, 2016
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* added `_out` and `_out_bufsize` validator [#346](amoffat/sh#346) * bugfix for internal stdout thread running when it shouldn't [#346](amoffat/sh#346) * regression bugfix on timeout [#344](amoffat/sh#344) * regression bugfix on `_ok_code=None` * further improvements on cpu usage * regression in cpu usage [#339](amoffat/sh#339) * fd leak regression and fix for flawed fd leak detection test [#337](amoffat/sh#337) * support for `io.StringIO` in python2 * added support for using raw file descriptors for `_in`, `_out`, and `_err` * removed `.close()`ing `_out` handler if FIFO detected * composed commands no longer propagate `_bg` * better support for using `sys.stdin` and `sys.stdout` for `_in` and `_out` * bugfix where `which()` would not stop searching at the first valid executable found in PATH * added `_long_prefix` for programs whose long arguments start with something other than `--` [#278](amoffat/sh#278) * added `_log_msg` for advanced configuration of log message [#311](amoffat/sh#311) * added `sh.contrib.sudo` * added `_arg_preprocess` for advanced command wrapping * alter callable `_in` arguments to signify completion with falsy chunk * bugfix where pipes passed into `_out` or `_err` were not flushed on process end [#252](amoffat/sh#252) * deprecated `with sh.args(**kwargs)` in favor of `sh2 = sh(**kwargs)` * made `sh.pushd` thread safe * added `.kill_group()` and `.signal_group()` methods for better process control [#237](amoffat/sh#237) * added `new_session` special keyword argument for controlling spawned process session [#266](amoffat/sh#266) * bugfix better handling for EINTR on system calls [#292](amoffat/sh#292) * bugfix where with-contexts were not threadsafe [#247](amoffat/sh#195) * `_uid` new special keyword param for specifying the user id of the process [#133](amoffat/sh#133) * bugfix where exceptions were swallowed by processes that weren't waited on [#309](amoffat/sh#309) * bugfix where processes that dupd their stdout/stderr to a long running child process would cause sh to hang [#310](amoffat/sh#310) * improved logging output [#323](amoffat/sh#323) * bugfix for python3+ where binary data was passed into a process's stdin [#325](amoffat/sh#325) * Introduced execution contexts which allow baking of common special keyword arguments into all commands [#269](amoffat/sh#269) * `Command` and `which` now can take an optional `paths` parameter which specifies the search paths [#226](amoffat/sh#226) * `_preexec_fn` option for executing a function after the child process forks but before it execs [#260](amoffat/sh#260) * `_fg` reintroduced, with limited functionality. hurrah! [#92](amoffat/sh#92) * bugfix where a command would block if passed a fd for stdin that wasn't yet ready to read [#253](amoffat/sh#253) * `_long_sep` can now take `None` which splits the long form arguments into individual arguments [#258](amoffat/sh#258) * making `_piped` perform "direct" piping by default (linking fds together). this fixes memory problems [#270](amoffat/sh#270) * bugfix where calling `next()` on an iterable process that has raised `StopIteration`, hangs [#273](amoffat/sh#273) * `sh.cd` called with no arguments no changes into the user's home directory, like native `cd` [#275](amoffat/sh#275) * `sh.glob` removed entirely. the rationale is correctness over hand-holding. [#279](amoffat/sh#279) * added `_truncate_exc`, defaulting to `True`, which tells our exceptions to truncate output. * bugfix for exceptions whose messages contained unicode * `_done` callback no longer assumes you want your command put in the background. * `_done` callback is now called asynchronously in a separate thread. * `_done` callback is called regardless of exception, which is necessary in order to release held resources, for example a process pool
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waitpid can fail with errno set to EINTR if an unblocked signal or SIGCHLD is caught (see http://www.tutorialspoint.com/unix_system_calls/waitpid.htm). Prior to python 3.5, this must be explicitly detected and the waitpid call retried (see https://www.python.org/dev/peps/pep-0475/).