From 2b86292ed1756a66439f79ceda88dfc86a10dfa9 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Thu, 17 Dec 2015 18:08:15 +0100 Subject: mingw: emulate write(2) that fails with a EPIPE On Windows, when writing to a pipe fails, errno is always EINVAL. However, Git expects it to be EPIPE. According to the documentation, there are two cases in which write() triggers EINVAL: the buffer is NULL, or the length is odd but the mode is 16-bit Unicode (the broken pipe is not mentioned as possible cause). Git never sets the file mode to anything but binary, therefore we know that errno should actually be EPIPE if it is EINVAL and the buffer is not NULL. See https://msdn.microsoft.com/en-us/library/1570wh78.aspx for more details. This works around t5571.11 failing with v2.6.4 on Windows. Signed-off-by: Johannes Schindelin Acked-by: Johannes Sixt Signed-off-by: Junio C Hamano --- compat/mingw.c | 17 +++++++++++++++++ compat/mingw.h | 3 +++ 2 files changed, 20 insertions(+) diff --git a/compat/mingw.c b/compat/mingw.c index f74da235f5..1d70f649fb 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -394,6 +394,23 @@ int mingw_fflush(FILE *stream) return ret; } +#undef write +ssize_t mingw_write(int fd, const void *buf, size_t len) +{ + ssize_t result = write(fd, buf, len); + + if (result < 0 && errno == EINVAL && buf) { + /* check if fd is a pipe */ + HANDLE h = (HANDLE) _get_osfhandle(fd); + if (GetFileType(h) == FILE_TYPE_PIPE) + errno = EPIPE; + else + errno = EINVAL; + } + + return result; +} + int mingw_access(const char *filename, int mode) { wchar_t wfilename[MAX_PATH]; diff --git a/compat/mingw.h b/compat/mingw.h index 738865c6c0..57ca477d1f 100644 --- a/compat/mingw.h +++ b/compat/mingw.h @@ -210,6 +210,9 @@ FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream); int mingw_fflush(FILE *stream); #define fflush mingw_fflush +ssize_t mingw_write(int fd, const void *buf, size_t len); +#define write mingw_write + int mingw_access(const char *filename, int mode); #undef access #define access mingw_access -- cgit v1.2.1