From b5a1af6f999820564ead4867b1e5d5574778ee56 Mon Sep 17 00:00:00 2001
From: Benny Prijono <bennylp@teluu.com>
Date: Mon, 31 Oct 2005 21:02:30 +0000
Subject: initial import

git-svn-id: http://svn.pjsip.org/repos/pjproject/main@1 74dad513-b988-da41-8d7b-12977e46ad98
---
 pjlib/include/pj/sock_select.h | 141 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 pjlib/include/pj/sock_select.h

(limited to 'pjlib/include/pj/sock_select.h')

diff --git a/pjlib/include/pj/sock_select.h b/pjlib/include/pj/sock_select.h
new file mode 100644
index 00000000..c54b31ce
--- /dev/null
+++ b/pjlib/include/pj/sock_select.h
@@ -0,0 +1,141 @@
+/* $Header: /pjproject-0.3/pjlib/include/pj/sock_select.h 3     10/14/05 12:26a Bennylp $ */
+/* $Log: /pjproject-0.3/pjlib/include/pj/sock_select.h $
+ * 
+ * 3     10/14/05 12:26a Bennylp
+ * Finished error code framework, some fixes in ioqueue, etc. Pretty
+ * major.
+ * 
+ * 2     9/21/05 1:39p Bennylp
+ * Periodic checkin for backup.
+ * 
+ * 1     9/15/05 8:40p Bennylp
+ * Created.
+ */
+#ifndef __PJ_SELECT_H__
+#define __PJ_SELECT_H__
+
+/**
+ * @file sock_select.h
+ * @brief Socket select().
+ */
+
+#include <pj/types.h>
+
+PJ_BEGIN_DECL 
+
+/**
+ * @defgroup PJ_SOCK_SELECT Socket select() API.
+ * @ingroup PJ_IO
+ * @{
+ * This module provides portable abstraction for \a select() like API.
+ * The abstraction is needed so that it can utilize various event
+ * dispatching mechanisms that are available across platforms.
+ *
+ * The API is very similar to normal \a select() usage. 
+ *
+ * \section pj_sock_select_examples_sec Examples
+ *
+ * For some examples on how to use the select API, please see:
+ *
+ *  - \ref page_pjlib_select_test
+ */
+
+/**
+ * Portable structure declarations for pj_fd_set.
+ * The implementation of pj_sock_select() does not use this structure 
+ * per-se, but instead it will use the native fd_set structure. However,
+ * we must make sure that the size of pj_fd_set_t can accomodate the
+ * native fd_set structure.
+ */
+typedef struct pj_fd_set_t
+{
+    pj_sock_t	data[FD_SETSIZE + 4];   /**< Opaque buffer for fd_set */
+} pj_fd_set_t;
+
+
+/**
+ * Initialize the descriptor set pointed to by fdsetp to the null set.
+ *
+ * @param fdsetp    The descriptor set.
+ */
+PJ_DECL(void) PJ_FD_ZERO(pj_fd_set_t *fdsetp);
+
+
+/**
+ * Add the file descriptor fd to the set pointed to by fdsetp. 
+ * If the file descriptor fd is already in this set, there shall be no effect
+ * on the set, nor will an error be returned.
+ *
+ * @param fd	    The socket descriptor.
+ * @param fdsetp    The descriptor set.
+ */
+PJ_DECL(void) PJ_FD_SET(pj_sock_t fd, pj_fd_set_t *fdsetp);
+
+/**
+ * Remove the file descriptor fd from the set pointed to by fdsetp. 
+ * If fd is not a member of this set, there shall be no effect on the set, 
+ * nor will an error be returned.
+ *
+ * @param fd	    The socket descriptor.
+ * @param fdsetp    The descriptor set.
+ */
+PJ_DECL(void) PJ_FD_CLR(pj_sock_t fd, pj_fd_set_t *fdsetp);
+
+
+/**
+ * Evaluate to non-zero if the file descriptor fd is a member of the set 
+ * pointed to by fdsetp, and shall evaluate to zero otherwise.
+ *
+ * @param fd	    The socket descriptor.
+ * @param fdsetp    The descriptor set.
+ *
+ * @return	    Nonzero if fd is member of the descriptor set.
+ */
+PJ_DECL(pj_bool_t) PJ_FD_ISSET(pj_sock_t fd, const pj_fd_set_t *fdsetp);
+
+
+/**
+ * Get the number of descriptors in the set.
+ *
+ * @param fdsetp    The descriptor set.
+ *
+ * @return          Number of descriptors in the set.
+ */
+PJ_DECL(pj_size_t) PJ_FD_COUNT(const pj_fd_set_t *fdsetp);
+
+
+/**
+ * This function wait for a number of file  descriptors to change status.
+ * The behaviour is the same as select() function call which appear in
+ * standard BSD socket libraries.
+ *
+ * @param n	    On Unices, this specifies the highest-numbered
+ *		    descriptor in any of the three set, plus 1. On Windows,
+ *		    the value is ignored.
+ * @param readfds   Optional pointer to a set of sockets to be checked for 
+ *		    readability.
+ * @param writefds  Optional pointer to a set of sockets to be checked for 
+ *		    writability.
+ * @param exceptfds Optional pointer to a set of sockets to be checked for 
+ *		    errors.
+ * @param timeout   Maximum time for select to wait, or null for blocking 
+ *		    operations.
+ *
+ * @return	    The total number of socket handles that are ready, or
+ *		    zero if the time limit expired, or -1 if an error occurred.
+ */
+PJ_DECL(int) pj_sock_select( int n, 
+			     pj_fd_set_t *readfds, 
+			     pj_fd_set_t *writefds,
+			     pj_fd_set_t *exceptfds, 
+			     const pj_time_val *timeout);
+
+
+/**
+ * @}
+ */
+
+
+PJ_END_DECL
+
+#endif	/* __PJ_SELECT_H__ */
-- 
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