configure: only try -Qunused-arguments for clang

[musl] / src / unistd / dup3.c

diff --git a/src/unistd/dup3.c b/src/unistd/dup3.c
index 1f7134b..f919f79 100644 (file)
--- a/src/unistd/dup3.c
+++ b/src/unistd/dup3.c
@@ -3,11 +3,11 @@
 #include <errno.h>
 #include <fcntl.h>
 #include "syscall.h"
-#include "libc.h"
 
 int __dup3(int old, int new, int flags)
 {
        int r;
+#ifdef SYS_dup2
        if (old==new) return __syscall_ret(-EINVAL);
        if (flags & O_CLOEXEC) {
                while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
@@ -15,6 +15,9 @@ int __dup3(int old, int new, int flags)
        }
        while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
        if (flags & O_CLOEXEC) __syscall(SYS_fcntl, new, F_SETFD, FD_CLOEXEC);
+#else
+       while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
+#endif
        return __syscall_ret(r);
 }