lib: dev: Provide a set of fds to flow_select

The flow_select call now takes as a parameter a flow_set_t, which
specifies a set of flow descriptors that will unblock the select call
when an SDU for one of them arrives. The select call has been moved to
its own header.

4 files changed, 70 insertions, 7 deletions

diff --git a/include/ouroboros/CMakeLists.txt b/include/ouroboros/CMakeLists.txt
index ae922b89..78a7bb9c 100644
--- a/include/ouroboros/CMakeLists.txt
+++ b/include/ouroboros/CMakeLists.txt
@@ -10,7 +10,8 @@ set(HEADER_FILES
   irm.h
   irm_config.h
   nsm.h
-  qos.h)
+  qos.h
+  select.h)
 
 install(FILES ${HEADER_FILES} DESTINATION usr/include/ouroboros)
 
diff --git a/include/ouroboros/dev.h b/include/ouroboros/dev.h
index d5fb744b..fe5ff4b5 100644
--- a/include/ouroboros/dev.h
+++ b/include/ouroboros/dev.h
@@ -22,7 +22,6 @@
 
 #include <unistd.h>
 #include <stdint.h>
-#include <time.h>
 
 #include <ouroboros/qos.h>
 #include <ouroboros/flow.h>
@@ -34,10 +33,12 @@
 
 /* These calls should be removed once we write the ouroboros OS. */
 int     ap_init(char * ap_name);
+
 void    ap_fini(void);
 
 /* Returns file descriptor (> 0) and client AE name. */
 int     flow_accept(char ** ae_name);
+
 int     flow_alloc_resp(int fd, int result);
 
 /*
@@ -47,13 +48,21 @@ int     flow_alloc_resp(int fd, int result);
 int     flow_alloc(char * dst_name,
                    char * src_ae_name,
                    struct qos_spec * qos);
+
 int     flow_alloc_res(int fd);
 
 int     flow_dealloc(int fd);
 
-int     flow_cntl(int fd, int cmd, int oflags);
-ssize_t flow_write(int fd, void * buf, size_t count);
-ssize_t flow_read(int fd, void * buf, size_t count);
-int     flow_select(const struct timespec * timeout);
+int     flow_cntl(int fd,
+                  int cmd,
+                  int oflags);
+
+ssize_t flow_write(int fd,
+                   void * buf,
+                   size_t count);
+
+ssize_t flow_read(int fd,
+                  void * buf,
+                  size_t count);
 
 #endif
diff --git a/include/ouroboros/select.h b/include/ouroboros/select.h
new file mode 100644
index 00000000..9e0b8fec
--- /dev/null
+++ b/include/ouroboros/select.h
@@ -0,0 +1,50 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * A select call for flows
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef OUROBOROS_SELECT_H
+#define OUROBOROS_SELECT_H
+
+#include <stdbool.h>
+#include <time.h>
+
+struct flow_set;
+
+struct flow_set * flow_set_create();
+
+void              flow_set_destroy(struct flow_set * set);
+
+void              flow_set_zero(struct flow_set * set);
+
+void              flow_set_add(struct flow_set * set,
+                               int               fd);
+
+void              flow_set_del(struct flow_set * set,
+                               int               fd);
+
+bool              flow_set_has(struct flow_set * set,
+                               int               fd);
+
+int               flow_select(struct flow_set *       set,
+                              const struct timespec * timeout);
+
+#endif /* OUROBOROS_SELECT_H */
diff --git a/include/ouroboros/shm_ap_rbuff.h b/include/ouroboros/shm_ap_rbuff.h
index 594c9260..6b11fd2d 100644
--- a/include/ouroboros/shm_ap_rbuff.h
+++ b/include/ouroboros/shm_ap_rbuff.h
@@ -24,6 +24,7 @@
 #ifndef OUROBOROS_SHM_AP_RBUFF_H
 #define OUROBOROS_SHM_AP_RBUFF_H
 
+#include <ouroboros/select.h>
 #include <sys/types.h>
 #include <sys/time.h>
 #include <stdbool.h>
@@ -58,7 +59,8 @@ struct rb_entry *     shm_ap_rbuff_read(struct shm_ap_rbuff * rb);
 
 int                   shm_ap_rbuff_peek_idx(struct shm_ap_rbuff * rb);
 
-int                   shm_ap_rbuff_peek_b(struct shm_ap_rbuff * rb,
+int                   shm_ap_rbuff_peek_b(struct shm_ap_rbuff *   rb,
+                                          bool *                  set,
                                           const struct timespec * timeout);
 
 ssize_t               shm_ap_rbuff_read_port(struct shm_ap_rbuff * rb,
@@ -69,4 +71,5 @@ ssize_t               shm_ap_rbuff_read_port_b(struct shm_ap_rbuff *   rb,
                                                const struct timespec * timeout);
 
 void                  shm_ap_rbuff_reset(struct shm_ap_rbuff * rb);
+
 #endif /* OUROBOROS_SHM_AP_RBUFF_H */