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[PATCH v4 00/10] forking and threading

v4 fixes a few minor compatability issues:
* add 'extern' reference for 'environ'
* small portability change with the signal handeling
* remove trailing ',' in enum
* null_fd not opened with O_NONBLOCK

Brandon Williams (9):
  t5550: use write_script to generate post-update hook
  t0061: run_command executes scripts without a #! line
  run-command: prepare command before forking
  run-command: use the async-signal-safe execv instead of execvp
  run-command: prepare child environment before forking
  run-command: don't die in child when duping /dev/null
  run-command: eliminate calls to error handling functions in child
  run-command: handle dup2 and close errors in child
  run-command: add note about forking and threading

Eric Wong (1):
  run-command: block signals between fork and execve

 run-command.c              | 425 ++++++++++++++++++++++++++++++++++++---------
 t/t0061-run-command.sh     |  11 ++
 t/t5550-http-fetch-dumb.sh |   5 +-
 3 files changed, 356 insertions(+), 85 deletions(-)