Mercurial > public > mercurial-scm > hg
comparison mercurial/windows.py @ 10237:2f7a38f336f4
serve: add and use portable spawnvp replacement
There is no standard python command to really detach a process under Windows.
Instead we use the low level API wrapped by subprocess module with all
necessary options to avoid any kind of context inheritance. Unfortunately, this
version still opens a new window for the child process.
The following have been tried:
- os.spawnv(os.P_NOWAIT): works but the child process is killed when parent
console terminates.
- os.spawnv(os.P_DETACH): works on python25, hang on python26 when writing to
the hgweb output socket.
- subprocess.CreateProcess() hack without shell mode: similar to
os.spawnv(os.P_DETACH).
Fix 1/3 for issue421
| author | Patrick Mezard <pmezard@gmail.com> |
|---|---|
| date | Fri, 10 Apr 2009 21:20:25 +0200 |
| parents | c31ac3f7fd8f |
| children | 8e4be44a676f |
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| 10236:49a8625b8cac | 10237:2f7a38f336f4 |
|---|---|
| 5 # This software may be used and distributed according to the terms of the | 5 # This software may be used and distributed according to the terms of the |
| 6 # GNU General Public License version 2, incorporated herein by reference. | 6 # GNU General Public License version 2, incorporated herein by reference. |
| 7 | 7 |
| 8 from i18n import _ | 8 from i18n import _ |
| 9 import osutil, error | 9 import osutil, error |
| 10 import errno, msvcrt, os, re, sys, random | 10 import errno, msvcrt, os, re, sys, random, subprocess |
| 11 | 11 |
| 12 nulldev = 'NUL:' | 12 nulldev = 'NUL:' |
| 13 umask = 002 | 13 umask = 002 |
| 14 | 14 |
| 15 # wrap osutil.posixfile to provide friendlier exceptions | 15 # wrap osutil.posixfile to provide friendlier exceptions |
| 319 # aborting at this point may leave serious inconsistencies. | 319 # aborting at this point may leave serious inconsistencies. |
| 320 # Ideally, we would notify the user here. | 320 # Ideally, we would notify the user here. |
| 321 pass | 321 pass |
| 322 os.rename(src, dst) | 322 os.rename(src, dst) |
| 323 | 323 |
| 324 def spawndetached(args): | |
| 325 # No standard library function really spawns a fully detached | |
| 326 # process under win32 because they allocate pipes or other objects | |
| 327 # to handle standard streams communications. Passing these objects | |
| 328 # to the child process requires handle inheritance to be enabled | |
| 329 # which makes really detached processes impossible. | |
| 330 class STARTUPINFO: | |
| 331 dwFlags = subprocess.STARTF_USESHOWWINDOW | |
| 332 hStdInput = None | |
| 333 hStdOutput = None | |
| 334 hStdError = None | |
| 335 wShowWindow = subprocess.SW_HIDE | |
| 336 | |
| 337 args = subprocess.list2cmdline(args) | |
| 338 # Not running the command in shell mode makes python26 hang when | |
| 339 # writing to hgweb output socket. | |
| 340 comspec = os.environ.get("COMSPEC", "cmd.exe") | |
| 341 args = comspec + " /c " + args | |
| 342 hp, ht, pid, tid = subprocess.CreateProcess( | |
| 343 None, args, | |
| 344 # no special security | |
| 345 None, None, | |
| 346 # Do not inherit handles | |
| 347 0, | |
| 348 # DETACHED_PROCESS | |
| 349 0x00000008, | |
| 350 os.environ, | |
| 351 os.getcwd(), | |
| 352 STARTUPINFO()) | |
| 353 return pid | |
| 354 | |
| 324 try: | 355 try: |
| 325 # override functions with win32 versions if possible | 356 # override functions with win32 versions if possible |
| 326 from win32 import * | 357 from win32 import * |
| 327 except ImportError: | 358 except ImportError: |
| 328 pass | 359 pass |