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@@ -9,7 +9,24 @@
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#include <sys/syscall.h>
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#include <unistd.h>
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+#if defined __NR_dup3 && !defined __NR_dup2
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+# include <fcntl.h>
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+extern int __libc_fcntl (int fd, int cmd, ...);
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+libc_hidden_proto(__libc_fcntl);
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+int dup2(int old, int newfd)
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+{
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+ /*
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+ * Check if old fd is valid before we try
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+ * to ducplicate it. Return it if valid
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+ * or EBADF otherwise
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+ */
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+ if (old == newfd)
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+ return fcntl(old, F_GETFL, 0) < 0 ? -1 : newfd;
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+ return dup3(old, newfd, 0);
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+}
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+#else
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_syscall2(int, dup2, int, oldfd, int, newfd)
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+#endif
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libc_hidden_def(dup2)
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