network, sockets: Replace `POLL_IN`, `POLL_OUT`, etc. constants with an `enum class PollEvents`

Actually, two enum classes, since for some reason there are two separate
yet identical `PollFD` types used in the codebase.  I get that one is
ABI-compatible with the Switch while the other is an abstract type used
for the host, but why not use `WSAPOLLFD` directly for the latter?

Anyway, why make this change?  Because on Apple platforms, `POLL_IN`,
`POLL_OUT`, etc. (with an underscore) are defined as macros in
<sys/signal.h>.  (This is inherited from FreeBSD.)  So defining
a variable with the same name causes a compile error.

I could just rename the variables, but while I was at it I thought I
might as well switch to an enum for stronger typing.

Also, change the type used for values copied directly to/from the
`events` and `revents` fields of the host *native*
`pollfd`/`WSASPOLLFD`, from `u32` to `short`, as `short` is the correct
canonical type on both Unix and Windows.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/core/hle/service/sockets/bsd.cpp b/src/core/hle/service/sockets/bsd.cpp
index a9875b9a6..70860e7f8 100644
--- a/src/core/hle/service/sockets/bsd.cpp
+++ b/src/core/hle/service/sockets/bsd.cpp
@@ -489,18 +489,18 @@ std::pair<s32, Errno> BSD::PollImpl(std::vector<u8>& write_buffer, std::vector<u
     }
 
     for (PollFD& pollfd : fds) {
-        ASSERT(pollfd.revents == 0);
+        ASSERT(False(pollfd.revents));
 
         if (pollfd.fd > static_cast<s32>(MAX_FD) || pollfd.fd < 0) {
             LOG_ERROR(Service, "File descriptor handle={} is invalid", pollfd.fd);
-            pollfd.revents = 0;
+            pollfd.revents = PollEvents{};
             return {0, Errno::SUCCESS};
         }
 
         const std::optional<FileDescriptor>& descriptor = file_descriptors[pollfd.fd];
         if (!descriptor) {
             LOG_ERROR(Service, "File descriptor handle={} is not allocated", pollfd.fd);
-            pollfd.revents = POLL_NVAL;
+            pollfd.revents = PollEvents::Nval;
             return {0, Errno::SUCCESS};
         }
     }
@@ -510,7 +510,7 @@ std::pair<s32, Errno> BSD::PollImpl(std::vector<u8>& write_buffer, std::vector<u
         Network::PollFD result;
         result.socket = file_descriptors[pollfd.fd]->socket.get();
         result.events = TranslatePollEventsToHost(pollfd.events);
-        result.revents = 0;
+        result.revents = Network::PollEvents{};
         return result;
     });