Replace home-grown dup2() implementation with actual dup2() calls. This

should slightly reduce the number of system calls in critical portions of
the shell, and select a more efficient path through the fdalloc code.

Reviewed by:	bde

1 files changed, 1 insertions, 1 deletions

diff --git a/bin/sh/input.c b/bin/sh/input.c
index 85b94d6759ec..9948881bc088 100644
--- a/bin/sh/input.c
+++ b/bin/sh/input.c
@@ -388,7 +388,7 @@ setinputfile(char *fname, int push)
 	if ((fd = open(fname, O_RDONLY)) < 0)
 		error("Can't open %s: %s", fname, strerror(errno));
 	if (fd < 10) {
-		fd2 = copyfd(fd, 10);
+		fd2 = fcntl(fd, F_DUPFD, 10);
 		close(fd);
 		if (fd2 < 0)
 			error("Out of file descriptors");