Initial integration of poll()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1266 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 24 insertions, 8 deletions

diff --git a/nuttx/fs/fs_poll.c b/nuttx/fs/fs_poll.c
index a59cee5aa..f28e84e26 100644
--- a/nuttx/fs/fs_poll.c
+++ b/nuttx/fs/fs_poll.c
@@ -48,6 +48,7 @@
 
 #include <nuttx/fs.h>
 #include <nuttx/sched.h>
+#include <nuttx/clock.h>
 
 #include "fs_internal.h"
 
@@ -195,6 +196,7 @@ static inline int poll_teardown(FAR struct pollfd *fds, nfds_t nfds, int *count)
 
   /* Process each descriptor in the list */
 
+  *count = 0;
   for (i = 0; i < nfds; i++)
     {
       /* Teardown the poll */
@@ -228,7 +230,7 @@ static inline int poll_teardown(FAR struct pollfd *fds, nfds_t nfds, int *count)
  *
  ****************************************************************************/
 
-static void poll_timeout(int argc, uint32 isem)
+static void poll_timeout(int argc, uint32 isem, ...)
 {
   /* Wake up the poller */
 
@@ -284,16 +286,19 @@ int poll(FAR struct pollfd *fds, nfds_t nfds, int timeout)
     {
       if (timeout >= 0)
         {
-          /* Wait for the poll event with a timeout */
+          /* Wait for the poll event with a timeout.  Note that the
+           * millisecond timeout has to be converted to system clock
+           * ticks for wd_start
+           */
 
           wdog = wd_create();
-          wd_start(wdog, poll_timeout, 1, (uint32)&sem);
+          wd_start(wdog,  MSEC2TICK(timeout), poll_timeout, 1, (uint32)&sem);
           poll_semtake(&sem);
           wd_delete(wdog);
         }
       else
         {
-          /* Wait for the poll event with not timeout */
+          /* Wait for the poll event with no timeout */
 
           poll_semtake(&sem);
         }
diff --git a/nuttx/include/poll.h b/nuttx/include/poll.h
index 1dd6fc180..e82d48f57 100644
--- a/nuttx/include/poll.h
+++ b/nuttx/include/poll.h
@@ -89,14 +89,25 @@
  * Public Type Definitions
  ****************************************************************************/
 
+/* The number of poll descriptors (required by poll() specification */
+
 typedef unsigned int nfds_t;
 
+/* In the standard poll() definition, the size of the event set is 'short'.
+ * Here we pick the smallest storage element that will contain all of the
+ * poll events.
+ */
+
+typedef ubyte pollevent_t;
+
+/* This is the Nuttx variant of the standard pollfd structure. */
+
 struct pollfd
 {
-  int    fd;       /* The descriptor being polled */
-  sem_t  *sem;     /* Pointer to semaphore used to post output event */
-  ubyte  events;   /* The input event flags */
-  ubyte  revents;  /* The output event flags */
+  int         fd;       /* The descriptor being polled */
+  sem_t      *sem;      /* Pointer to semaphore used to post output event */
+  pollevent_t events;   /* The input event flags */
+  pollevent_t revents;  /* The output event flags */
 };
 
 /****************************************************************************