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-rw-r--r--os/io.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/os/io.c b/os/io.c
index cf5e8f933..8181a8639 100644
--- a/os/io.c
+++ b/os/io.c
@@ -102,12 +102,17 @@ typedef struct _connectionOutput {
static ConnectionInputPtr AllocateInputBuffer(void);
static ConnectionOutputPtr AllocateOutputBuffer(void);
-/* check for both EAGAIN and EWOULDBLOCK, because some supposedly POSIX
+/* If EAGAIN and EWOULDBLOCK are distinct errno values, then we check errno
+ * for both EAGAIN and EWOULDBLOCK, because some supposedly POSIX
* systems are broken and return EWOULDBLOCK when they should return EAGAIN
*/
#ifndef WIN32
-#define ETEST(err) (err == EAGAIN || err == EWOULDBLOCK)
-#else /* WIN32 The socket errorcodes differ from the normal errors */
+# if (EAGAIN != EWOULDBLOCK)
+# define ETEST(err) (err == EAGAIN || err == EWOULDBLOCK)
+# else
+# define ETEST(err) (err == EAGAIN)
+# endif
+#else /* WIN32 The socket errorcodes differ from the normal errors */
#define ETEST(err) (err == EAGAIN || err == WSAEWOULDBLOCK)
#endif