LibCore: Use Core::System::poll() in PosixSocketHelper

Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/3750687821
Pull-request: https://github.com/SerenityOS/serenity/pull/16439
Reviewed-by: https://github.com/timschumi ✅

Userland/Libraries/LibCore/Stream.cpp

@@ -9,7 +9,6 @@
 #include <LibCore/System.h>
 #include <fcntl.h>
 #include <netdb.h>
-#include <poll.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/types.h>
@@ -461,15 +460,13 @@ ErrorOr<bool> PosixSocketHelper::can_read_without_blocking(int timeout) const
 {
     struct pollfd the_fd = { .fd = m_fd, .events = POLLIN, .revents = 0 };
 
-    // FIXME: Convert this to Core::System
-    int rc;
+    ErrorOr<int> result { 0 };
     do {
-        rc = ::poll(&the_fd, 1, timeout);
-    } while (rc < 0 && errno == EINTR);
+        result = Core::System::poll({ &the_fd, 1 }, timeout);
+    } while (result.is_error() && result.error().code() == EINTR);
 
-    if (rc < 0) {
-        return Error::from_syscall("poll"sv, -errno);
-    }
+    if (result.is_error())
+        return result.release_error();
 
     return (the_fd.revents & POLLIN) > 0;
 }