Kernel+LibC: Add sys$recvfd() and sys$sendfd() for fd passing

These new syscalls allow you to send and receive file descriptors over
a local domain socket. This will enable various privilege separation
techniques and other good stuff. :^)

2 files changed, 14 insertions, 0 deletions

diff --git a/Libraries/LibC/sys/socket.cpp b/Libraries/LibC/sys/socket.cpp
index 81e83aaed7..62e27a20f8 100644
--- a/Libraries/LibC/sys/socket.cpp
+++ b/Libraries/LibC/sys/socket.cpp
@@ -119,4 +119,16 @@ int getpeername(int sockfd, struct sockaddr* addr, socklen_t* addrlen)
     int rc = syscall(SC_getpeername, &params);
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
+
+int sendfd(int sockfd, int fd)
+{
+    int rc = syscall(SC_sendfd, sockfd, fd);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int recvfd(int sockfd)
+{
+    int rc = syscall(SC_recvfd, sockfd);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
 }
diff --git a/Libraries/LibC/sys/socket.h b/Libraries/LibC/sys/socket.h
index 2e98f47865..269158beb1 100644
--- a/Libraries/LibC/sys/socket.h
+++ b/Libraries/LibC/sys/socket.h
@@ -100,5 +100,7 @@ int getsockopt(int sockfd, int level, int option, void*, socklen_t*);
 int setsockopt(int sockfd, int level, int option, const void*, socklen_t);
 int getsockname(int sockfd, struct sockaddr*, socklen_t*);
 int getpeername(int sockfd, struct sockaddr*, socklen_t*);
+int sendfd(int sockfd, int fd);
+int recvfd(int sockfd);
 
 __END_DECLS