Port: Remove _GNU_SOURCE, defined in config.h

[lttng-tools.git] / src / common / sessiond-comm / inet.h

diff --git a/src/common/sessiond-comm/inet.h b/src/common/sessiond-comm/inet.h
index 89716b8bafdb0b19cfaa1cca503e34af140711dc..6a79c91061d0be0499a881c1b7267852f7230ec0 100644 (file)
--- a/src/common/sessiond-comm/inet.h
+++ b/src/common/sessiond-comm/inet.h
@@ -18,11 +18,30 @@
 #ifndef _LTTCOMM_INET_H
 #define _LTTCOMM_INET_H
 
-#define _GNU_SOURCE
 #include <limits.h>
 
 #include "sessiond-comm.h"
 
+/* See man tcp(7) for more detail about this value. */
+#define LTTCOMM_INET_PROC_SYN_RETRIES_PATH "/proc/sys/net/ipv4/tcp_syn_retries"
+#define LTTCOMM_INET_PROC_FIN_TIMEOUT_PATH "/proc/sys/net/ipv4/tcp_fin_timeout"
+
+/*
+ * The timeout value of a connect() is computed with an algorithm inside the
+ * kernel using the defined TCP SYN retries so the end value in time is
+ * approximative. According to tcp(7) man page, a value of 5 is roughly 180
+ * seconds of timeout. With that information, we've computed a factor of 36
+ * (180/5) by considering that it grows linearly. This is of course uncertain
+ * but this is the best approximation we can do at runtime.
+ */
+#define LTTCOMM_INET_SYN_TIMEOUT_FACTOR                36
+
+/*
+ * Maximum timeout value in seconds of a TCP connection for both send/recv and
+ * connect operations.
+ */
+extern unsigned long lttcomm_inet_tcp_timeout;
+
 /* Stub */
 struct lttcomm_sock;
 
@@ -41,4 +60,7 @@ extern ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
 extern ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
                size_t len, int flags);
 
+/* Initialize inet communication layer. */
+extern void lttcomm_inet_init(void);
+
 #endif /* _LTTCOMM_INET_H */