libmemif: ubuntu 18.04 build fix

Change-Id: I6624cacd625eea6a9b8214f67d14ec162e2c0195
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>

extras/libmemif/configure.ac

@@ -7,6 +7,8 @@ AC_PREFIX_DEFAULT([/usr])
 PKG_CHECK_MODULES([CHECK], [check], [HAVE_CHECK=1], [HAVE_CHECK=0])
 AM_CONDITIONAL([USE_CHECK],[test "$HAVE_CHECK" -eq 1])
 
+AC_CHECK_FUNC([memfd_create], [AC_DEFINE([HAVE_MEMFD_CREATE], [1], [Define if memfd exists])])
+
 AC_PROG_CC
 
 AC_OUTPUT([Makefile])

extras/libmemif/src/libmemif.h

@@ -169,7 +169,7 @@ typedef struct
 
   memif_interface_id_t interface_id;
   uint8_t interface_name[32];
-  uint8_t instance_name[32];
+  uint8_t instance_name[32];	/*!< deprecated, will be removed in 2.0 */
   memif_interface_mode_t mode:8;
 } memif_conn_args_t;
 
@@ -308,7 +308,7 @@ int memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
 
 /** \brief Memif initialization
     @param on_control_fd_update - if control fd updates inform user to watch new fd
-    @param app_name - application name
+    @param app_name - application name (will be truncated to 32 chars)
 
     if param on_control_fd_update is set to NULL,
     libmemif will handle file descriptor event polling

extras/libmemif/src/main.c

@@ -406,17 +406,16 @@ memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name)
 {
   int err = MEMIF_ERR_SUCCESS;	/* 0 */
   libmemif_main_t *lm = &libmemif_main;
+  memset (lm, 0, sizeof (libmemif_main_t));
 
   if (app_name)
     {
-      lm->app_name = malloc (strlen (app_name) + sizeof (char));
+      uint8_t len = (strlen (app_name) < MEMIF_NAME_LEN)
-      memset (lm->app_name, 0, strlen (app_name) + sizeof (char));
+	? MEMIF_NAME_LEN : strlen (app_name);
       strncpy ((char *) lm->app_name, app_name, strlen (app_name));
     }
   else
     {
-      lm->app_name = malloc (strlen (MEMIF_DEFAULT_APP_NAME) + sizeof (char));
-      memset (lm->app_name, 0, strlen (app_name) + sizeof (char));
       strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
 	       strlen (MEMIF_DEFAULT_APP_NAME));
     }
@@ -438,8 +437,6 @@ memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name)
       DBG ("libmemif event polling initialized");
     }
 
-  memset (&lm->ms, 0, sizeof (memif_socket_t));
-
   lm->control_list_len = 2;
   lm->interrupt_list_len = 2;
   lm->listener_list_len = 1;
@@ -490,7 +487,6 @@ memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name)
   lm->arm.it_value.tv_nsec = 0;
   lm->arm.it_interval.tv_sec = 2;
   lm->arm.it_interval.tv_nsec = 0;
-  memset (&lm->disarm, 0, sizeof (lm->disarm));
 
   if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
     {
@@ -2096,9 +2092,6 @@ int
 memif_cleanup ()
 {
   libmemif_main_t *lm = &libmemif_main;
-  if (lm->app_name)
-    free (lm->app_name);
-  lm->app_name = NULL;
   if (lm->control_list)
     free (lm->control_list);
   lm->control_list = NULL;

extras/libmemif/src/memif_private.h

@@ -26,9 +26,14 @@
 #include <inttypes.h>
 #include <limits.h>
 #include <sys/timerfd.h>
+#include <string.h>
 
 #include <libmemif.h>
 
+#define MEMIF_NAME_LEN 32
+_Static_assert (strlen (MEMIF_DEFAULT_APP_NAME) <= MEMIF_NAME_LEN,
+		"MEMIF_DEFAULT_APP_NAME max length is 32");
+
 #define MEMIF_DEFAULT_SOCKET_DIR "/run/vpp"
 #define MEMIF_DEFAULT_SOCKET_FILENAME  "memif.sock"
 #define MEMIF_DEFAULT_RING_SIZE 1024
@@ -142,8 +147,8 @@ typedef struct memif_connection
   /* connection message queue */
   memif_msg_queue_elt_t *msg_queue;
 
-  uint8_t remote_if_name[32];
+  uint8_t remote_if_name[MEMIF_NAME_LEN];
-  uint8_t remote_name[32];
+  uint8_t remote_name[MEMIF_NAME_LEN];
   uint8_t remote_disconnect_string[96];
 
   memif_region_t *regions;
@@ -186,7 +191,7 @@ typedef struct
   int timerfd;
   struct itimerspec arm, disarm;
   uint16_t disconn_slaves;
-  uint8_t *app_name;
+  uint8_t app_name[MEMIF_NAME_LEN];
 
   /* master implementation... */
   memif_socket_t ms;
@@ -237,11 +242,13 @@ int free_list_elt (memif_list_elt_t * list, uint16_t len, int key);
 #endif
 #endif
 
+#ifndef HAVE_MEMFD_CREATE
 static inline int
 memfd_create (const char *name, unsigned int flags)
 {
   return syscall (__NR_memfd_create, name, flags);
 }
+#endif
 
 static inline void *
 memif_get_buffer (memif_connection_t * conn, memif_ring_t * ring,
@@ -254,7 +261,12 @@ memif_get_buffer (memif_connection_t * conn, memif_ring_t * ring,
 #ifndef F_LINUX_SPECIFIC_BASE
 #define F_LINUX_SPECIFIC_BASE 1024
 #endif
+
+#ifndef MFD_ALLOW_SEALING
 #define MFD_ALLOW_SEALING       0x0002U
+#endif
+
+#ifndef F_ADD_SEALS
 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
 
@@ -262,5 +274,6 @@ memif_get_buffer (memif_connection_t * conn, memif_ring_t * ring,
 #define F_SEAL_SHRINK   0x0002	/* prevent file from shrinking */
 #define F_SEAL_GROW     0x0004	/* prevent file from growing */
 #define F_SEAL_WRITE    0x0008	/* prevent writes */
+#endif
 
 #endif /* _MEMIF_PRIVATE_H_ */