Add pipe2() system call.

The pipe2() function is similar to pipe() but allows setting FD_CLOEXEC and
O_NONBLOCK (on both sides) as part of the function.

If p points to two writable ints, pipe2(p, 0) is equivalent to pipe(p).

If the pointer is not valid, behaviour differs: pipe2() writes into the
array from the kernel like socketpair() does, while pipe() writes into the
array from an architecture-specific assembler wrapper.

Reviewed by:	kan, kib

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map
index 149fa417b50a..24f462125513 100644
--- a/lib/libc/sys/Symbol.map
+++ b/lib/libc/sys/Symbol.map
@@ -393,6 +393,7 @@ FBSD_1.3 {
 	ffclock_getcounter;
 	ffclock_getestimate;
 	ffclock_setestimate;
+	pipe2;
 	posix_fadvise;
 	wait6;
 };