libbb: don't build useless functions

The functions ndelay_on(), ndelay_off() and close_on_exec_on()
don't do anything useful because our fcntl(2) implementation
doesn't support the features they require.

Replace them with stubs.

Saves 176-208 bytes.

2 files changed, 8 insertions, 0 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 7683b3f63..a4eebab99 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -592,9 +592,15 @@ const char* endofname(const char *name) FAST_FUNC;
 char *is_prefixed_with(const char *string, const char *key) FAST_FUNC;
 char *is_suffixed_with(const char *string, const char *key) FAST_FUNC;
 
+#if !ENABLE_PLATFORM_MINGW32
 int ndelay_on(int fd) FAST_FUNC;
 int ndelay_off(int fd) FAST_FUNC;
 void close_on_exec_on(int fd) FAST_FUNC;
+#else
+static inline int ndelay_on(int fd UNUSED_PARAM) { return 0; }
+static inline int ndelay_off(int fd UNUSED_PARAM) { return 0; }
+static inline void close_on_exec_on(int fd UNUSED_PARAM) { return; }
+#endif
 void xdup2(int, int) FAST_FUNC;
 void xmove_fd(int, int) FAST_FUNC;
 
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index cbeb24701..813985194 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -23,6 +23,7 @@
 #include "libbb.h"
 
 /* Turn on nonblocking I/O on a fd */
+#if !ENABLE_PLATFORM_MINGW32
 int FAST_FUNC ndelay_on(int fd)
 {
         int flags = fcntl(fd, F_GETFL);
@@ -45,6 +46,7 @@ void FAST_FUNC close_on_exec_on(int fd)
 {
         fcntl(fd, F_SETFD, FD_CLOEXEC);
 }
+#endif
 
 char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
 {