Subject: [PATCH v3 0/2] Fixup for js/mingw-o-append

From: "Jeff Hostetler via GitGitGadget" <[email-masked]>
Date: Tue, 11 Sep 2018 13:05:59 -0700 (PDT)

The recent change mingw O_APPEND change breaks writing to named pipes on
Windows. The first commit adds a new test to confirm the breakage and the
second commit fixes the problem. These could be squashed together or we can
just keep the fix and omit the test if that would be better.

d641097589 (js/mingw-o-append) mingw: enable atomic O_APPEND

The new mingw_open_append() routine successfully opens the client side of
the named pipe, but the first write() to it fails with EBADF. Adding the
FILE_WRITE_DATA corrects the problem.

 Signed-off-by: Jeff Hostetler [email-masked]
[[email-masked]]

Cc: [email-masked]: [email-masked]: [email-masked]: 
[email-masked]

Jeff Hostetler (2):
  t0051: test GIT_TRACE to a windows named pipe
  mingw: fix mingw_open_append to work with named pipes

 Makefile                           |  1 +
 compat/mingw.c                     | 36 +++++++++++++--
 t/helper/test-tool.c               |  3 ++
 t/helper/test-tool.h               |  3 ++
 t/helper/test-windows-named-pipe.c | 72 ++++++++++++++++++++++++++++++
 t/t0051-windows-named-pipe.sh      | 17 +++++++
 6 files changed, 129 insertions(+), 3 deletions(-)
 create mode 100644 t/helper/test-windows-named-pipe.c
 create mode 100755 t/t0051-windows-named-pipe.sh

base-commit: d641097589160eb795127d8dbcb14c877c217b60
Published-As: https://github.com/gitgitgadget/git/releases/tags/pr-35%2Fjeffhostetler%2Ffixup-mingw-o-append-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-35/jeffhostetler/fixup-mingw-o-append-v3
Pull-Request: https://github.com/gitgitgadget/git/pull/35

Range-diff vs v2:

 1:  ecb30eb47c = 1:  ecb30eb47c t0051: test GIT_TRACE to a windows named pipe
 2:  f0361dd306 ! 2:  5592300ca5 mingw: fix mingw_open_append to work with named pipes
     @@ -46,22 +46,20 @@
       	return fd;
       }
       
     -+#define IS_SBS(ch) (((ch) == '/') || ((ch) == '\\'))
      +/*
      + * Does the pathname map to the local named pipe filesystem?
      + * That is, does it have a "//./pipe/" prefix?
      + */
     -+static int mingw_is_local_named_pipe_path(const char *filename)
     ++static int is_local_named_pipe_path(const char *filename)
      +{
     -+	return (IS_SBS(filename[0]) &&
     -+		IS_SBS(filename[1]) &&
     ++	return (is_dir_sep(filename[0]) &&
     ++		is_dir_sep(filename[1]) &&
      +		filename[2] == '.'  &&
     -+		IS_SBS(filename[3]) &&
     ++		is_dir_sep(filename[3]) &&
      +		!strncasecmp(filename+4, "pipe", 4) &&
     -+		IS_SBS(filename[8]) &&
     ++		is_dir_sep(filename[8]) &&
      +		filename[9]);
      +}
     -+#undef IS_SBS
      +
       int mingw_open (const char *filename, int oflags, ...)
       {
     @@ -71,7 +69,7 @@
       		filename = "nul";
       
      -	if (oflags & O_APPEND)
     -+	if ((oflags & O_APPEND) && !mingw_is_local_named_pipe_path(filename))
     ++	if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
       		open_fn = mingw_open_append;
       	else
       		open_fn = _wopen;

-- 
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