D40882.id124213.diff
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D40882.id124213.diff
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	diff --git a/bin/cat/cat.c b/bin/cat/cat.c
	--- a/bin/cat/cat.c
	+++ b/bin/cat/cat.c
	@@ -84,6 +84,7 @@
	#ifndef BOOTSTRAP_CAT
	static void cook_cat(FILE *);
	#endif
	+static int in_kernel_copy(int);
	static void raw_cat(int);

	#ifndef NO_UDOM_SUPPORT
	@@ -280,7 +281,9 @@
	}
	#endif
	} else {
	- raw_cat(fd);
	+ if (in_kernel_copy(fd) == -1) {
	+ raw_cat(fd);
	+ }
	if (fd != STDIN_FILENO)
	close(fd);
	}
	@@ -382,6 +385,20 @@
	}
	#endif /* BOOTSTRAP_CAT */

	+static int
	+in_kernel_copy(int rfd)
	+{
	+ int ret, wfd;
	+
	+ wfd = fileno(stdout);
	+ ret = 1;
	+
	+ while (ret > 0)
	+ ret = copy_file_range(rfd, NULL, wfd, NULL, SSIZE_MAX, 0);
	+
	+ return (ret);
	+}
	+
	static void
	raw_cat(int rfd)
	{