libc: Add wrapper for poll()

libc/CMakeLists.txt

@@ -32,6 +32,7 @@ set(SOURCES
     src/sys/pstat.cpp
     src/sys/resource.cpp
     src/sys/socket.cpp
+    src/sys/poll.cpp
 )
 
 if(${LUNA_ARCH} STREQUAL "x86_64")

libc/include/sys/poll.h

@@ -0,0 +1,20 @@
+/* sys/poll.h: Wait for events on multiple file descriptors. */
+
+#ifndef _SYS_POLL_H
+#define _SYS_POLL_H
+
+#include <bits/poll.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Wait for events on multiple file descriptors. */
+    int poll(struct pollfd* fds, nfds_t nfds, int timeout);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

libc/src/sys/poll.cpp

@@ -0,0 +1,13 @@
+#include <bits/errno-return.h>
+#include <sys/poll.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+extern "C"
+{
+    int poll(struct pollfd* fds, nfds_t nfds, int timeout)
+    {
+        long rc = syscall(SYS_poll, fds, nfds, timeout);
+        __errno_return(rc, int);
+    }
+}