v3.5.1

• Fix a potential failure when polling curl file descriptors on Windows.

v3.5.0

• You can now append environment variables to the ones set in the current
  process if you include "current" in the value of env, in run()
  and for process$new(): env = c("current", NEW = "newvalue") (#232).

• Sub-processes can now inherit the standard input, output and error from
  the main R process, by setting the corresponding argument to an empty
  string. E.g. run("ls", stdout = "") (#72).

• run() is now much faster with large standard output or standard
  error (#286).

• run() can now discard the standard output and error or redirect
  them to file(s), instead of collecting them.

• processx now optionally uses the cli package to color error messages
  and stack traces, instead of crayon.

v3.4.5

• New options in pty_options to set the initial size of the pseudo
  terminal.

• Reading the standard output or error now does not crash occasionally
  when a \n character is at the beginning of the input buffer (#281).

v3.4.4

• processx now works correctly for non-ASCII commands and arguments passed
  in the native encoding, on Windows (#261, #262, #263, #264).

• Providing multiple environment variables now works on windows (#267).

v3.4.3

• The supervisor (activated with supervise = TRUE) does not crash
  on the Windows Subsystem on Linux (WSL) now (#222).

• Fix ABI compatibility for pre and post R 4.0.1 versions. Now CRAN
  builds (with R 4.0.2 and later 4.0.x) work well on R 4.0.0.

• Now processx can run commands on UNC paths specified with
  forward slashes: //hostname/... UNC paths with the usual
  back-slashes were always fine (#249).

• The $as_ps_handle() method works now better; previously it
  sometimes created an invalid ps::ps_handle object, if the system
  clock has changed (#258).

v3.4.2

• run() now does a better job with displaying the spinner on terminals
  that buffer the output (#223).

• Error messages are now fully printed after an error. In non-interactive
  sessions, the stack trace is printed as well.

• Further improved error messages. Errors from C code now include the
  name of the C function, and errors that belong to a process include the
  system command (#197).

• processx does not crash now if the process receives a SIGPIPE signal when
  trying to write to a pipe, of which the other end has already exited.

• processx now works better with fork clusters from the parallel
  package. See 'Mixing processx and the parallel base R package' in the
  README file (#236).

• processx now does not block SIGCHLD by default in the subprocess,
  blocking potentially causes zombie sub-subprocesses (#240).

• The process$wait() method now does not leak file descriptors on
  Unix when interrupted (#141).

v3.4.1

• Now run() does not create an ok variable in the global environment.

v3.4.0

• Processx has now better error messages, in particular, all errors from C
  code contain the file name and line number, and the system error code
  and message (where applicable).

• Processx now sets the .Last.error variable for every un-caught processx
  error to the error condition, and also sets .Last.error.trace to its
  stack trace.

• run() now prints the last 10 lines of the standard error stream on
  error, if echo = FALSE, and it also prints the exit status of the
  process.

• run() now includes the standard error in the condition signalled on
  interrupt.

• process now supports creating pseudo terminals on Unix systems.

• conn_create_pipepair() gets new argument to set the pipes as blocking
  or non-blocking.

• process does not set the inherited extra connections as blocking,
  and it also does not close them after starting the subprocess.
  This is now the responsibility of the user. Note that this is a
  breaking change.

• run() now passes extra ... arguments to process$new().

• run() now does not error if the process is killed in a callback.

v3.3.1

• Fix a crash on Windows, when a connection that has a pending read
  internally is finalized.

v3.3.0

processx 3.3.0

• process can now redirect the standard error to the standard output, via
  specifying stderr = "2>&1". This works both with files and pipes.

• run() can now redirect the standard error to the standard output, via
  the new stderr_to_stdout argument.

• The $kill() and $kill_tree() methods get a close_connection = TRUE
  argument that closes all pipe connections of the process.

• run() now always kills the process (and its process tree if
  cleanup_tree is TRUE) before exiting. This also closes all
  pipe connections (#149).