tls: avoid unnecessary changes to POSIX build, part 2

On reflection, the previous commit may have been ill-advised.  There
are many calls to open_read_close() and most shouldn't be able to
access special devices.  (Though in practice only a few are enabled
in busybox-w32.)

Nonetheless, I've implemented a new mechanism which uses the macro
MINGW_SPECIAL() to mark calls to functions that are allowed to
access special devices.

An unrelated change is to avoid compiling fputs_stdout() in
coreutils/printf.c for the POSIX build.

1 files changed, 9 insertions, 0 deletions

diff --git a/win32/mingw.c b/win32/mingw.c
index ed0989be2..474d9cdc6 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -229,6 +229,15 @@ int mingw_xopen(const char *pathname, int flags)
         return ret;
 }
 
+ssize_t FAST_FUNC mingw_open_read_close(const char *fn, void *buf, size_t size)
+{
+        /* allow use of special devices */
+        int fd = mingw_open(fn, O_RDONLY|O_SPECIAL);
+        if (fd < 0)
+                return fd;
+        return read_close(fd, buf, size);
+}
+
 #undef fopen
 FILE *mingw_fopen (const char *filename, const char *otype)
 {