From: Markos Chandras <[email protected]>
Signed-off-by: Markos Chandras <[email protected]>
---
libc/sysdeps/linux/common/dup2.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/libc/sysdeps/linux/common/dup2.c b/libc/sysdeps/linux/common/dup2.c
index 006f06b..88856ab 100644
--- a/libc/sysdeps/linux/common/dup2.c
+++ b/libc/sysdeps/linux/common/dup2.c
@@ -9,7 +9,24 @@
#include <sys/syscall.h>
#include <unistd.h>
+#if defined(__NR_dup3) && !defined(__NR_dup2)
+#include <fcntl.h>
+extern int __libc_fcntl (int fd, int cmd, ...);
+libc_hidden_proto(__libc_fcntl);
+int dup2(int old, int newfd)
+{
+ /*
+ * Check if old fd is valid before we try
+ * to ducplicate it. Return it if valid
+ * or EBADF otherwise
+ */
+ if (old == newfd)
+ return __libc_fcntl(old, F_GETFL, 0) < 0 ? -1 : newfd;
+ return dup3(old, newfd, 0);
+}
+#else
_syscall2(int, dup2, int, oldfd, int, newfd)
+#endif
libc_hidden_def(dup2)
--
1.8.0
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