Merge branch 'js/emu-write-epipe-on-windows'

The write(2) emulation for Windows learned to set errno to EPIPE
when necessary.

* js/emu-write-epipe-on-windows:
  mingw: emulate write(2) that fails with a EPIPE

Author: gitster

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];

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