LD_PRELOAD epoll_ctl implementation

- EPOLL_CTL_ADD
- EPOLL_CTL_MOD
- EPOLL_CTL_DEL
- close()

- amend 1
  - removed stubs for vppcom_session_epoll_create and ctl
  - add trace for epoll_create, epoll_ctl and epoll_wait

Change-Id: I0822f2212d56319f41236473bf547cf118fb18e0
Signed-off-by: shrinivasan ganapathy <shrinivasanganapathy@gmail.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/vcl-ldpreload/src/libvcl-ldpreload/vcom.c b/vcl-ldpreload/src/libvcl-ldpreload/vcom.c
index 75054eb..eb5e8d1 100644
--- a/vcl-ldpreload/src/libvcl-ldpreload/vcom.c
+++ b/vcl-ldpreload/src/libvcl-ldpreload/vcom.c
@@ -2657,8 +2657,14 @@ int
 epoll_create (int __size)
 {
   int rv = 0;
+  pid_t pid = getpid ();
 
   rv = vcom_epoll_create(__size);
+  if (VCOM_DEBUG > 0)
+    fprintf (stderr,
+             "[%d] epoll_create: "
+             "'%04d'='%04d'\n",
+             pid, rv, __size);
   if (rv < 0)
     {
       errno = -rv;
@@ -2695,8 +2701,14 @@ int
 epoll_create1 (int __flags)
 {
   int rv = 0;
+  pid_t pid = getpid ();
 
   rv = vcom_epoll_create1(__flags);
+  if (VCOM_DEBUG > 0)
+    fprintf (stderr,
+             "[%d] epoll_create: "
+             "'%04d'='%08x'\n",
+             pid, rv, __flags);
   if (rv < 0)
     {
       errno = -rv;
@@ -2737,10 +2749,12 @@ vcom_epoll_ctl (int __epfd, int __op, int __fd,
     }
 
   /* fd is same as epfd */
+  /* do not permit adding an epoll file descriptor inside itself */
   if (__epfd == __fd)
     {
       return -EINVAL;
     }
+
   /* implementation */
   return vcom_socket_epoll_ctl (__epfd, __op, __fd,
                                 __event);
@@ -2768,7 +2782,8 @@ epoll_ctl (int __epfd, int __op, int __fd,
           if (VCOM_DEBUG > 0)
             fprintf (stderr,
                      "[%d] epoll_ctl: "
-                     "'%04d'='%04d', '%04d', '%04d'\n", pid, rv, __epfd, __op, __fd);
+                     "'%04d'='%04d', '%04d', '%04d'\n",
+                     pid, rv, __epfd, __op, __fd);
           if (rv != 0)
             {
               errno = -rv;