[lib] Add close_fd() & close_file()

These functions are aimed to be used with pthread_cleanup_push().

libowlps/libowlps.c

@@ -444,3 +444,48 @@ void owl_sigterm_handler(int num)
 
   owl_sigint_handler(SIGINT) ;
 }
+
+
+
+/*
+ * Closes the file descriptor 'fd'.
+ * 'fd' must be passed as an int pointer (int*).
+ */
+void owl_close_fd(void *fd)
+{
+  if (fd == NULL)
+    return ;
+
+  int *file_desc = fd ;
+  if (close(*file_desc) != 0)
+    perror("Error closing file descriptor") ;
+#ifdef DEBUG
+  else
+    fprintf(stderr, "File descriptor %d closed successfully.\n",
+            *file_desc) ;
+#endif // DEBUG
+}
+
+
+
+/*
+ * Closes the stream 'file'.
+ * 'file' must be passed as a pointer on a pointer of FILE (FILE**).
+ * If *file either stdout, stderr or stdin, it will not be closed.
+ */
+void owl_close_file(void *file)
+{
+  if (file == NULL)
+    return ;
+
+  FILE **stream = file ;
+  if (*stream == stdout || *stream == stderr || *stream == stdin)
+    return ;
+
+  if (fclose(*stream) != 0)
+    perror("Error closing stream") ;
+#ifdef DEBUG
+  else
+    fprintf(stderr, "Stream closed successfully.\n") ;
+#endif // DEBUG
+}

libowlps/owlps.h

@@ -271,6 +271,10 @@ int owl_iface_channel_hop(char *iface) ;
 void owl_sigint_handler(int num) ;
 void owl_sigterm_handler(int num) ;
 
+// Threads
+void owl_close_fd(void *fd) ;
+void owl_close_file(void *file) ;
+
 
 /* Macros */