More SIOCATMARK cahnges.

man7/ip.7

@@ -654,7 +654,7 @@ files or using the
 interface.
 .\"
 .TP
-.B ip_always_defrag " (Boolean)"
+.BR ip_always_defrag " (Boolean)"
 [New with kernel 2.2.13; in earlier kernel version the feature was controlled
 at compile time by the
 .B CONFIG_IP_ALWAYS_DEFRAG 
@@ -737,7 +737,6 @@ Time in seconds to keep an IPv6 fragment in memory.
 .BR ip6frag_secret_interval " (integer; default 600)"
 Regeneration interval (in seconds) of the hash secret (or lifetime
 for the hash secret) for IPv6 fragments.
-Default: 600
 .TP
 .BR ipfrag_high_thresh " (integer), " ipfrag_low_thresh " (integer)"
 If the amount of queued IP fragments reaches 

man7/tcp.7

@@ -121,7 +121,9 @@ ioctl),
 otherwise it can be only received when the
 .B MSG_OOB
 flag is set for 
-.BR sendmsg (2). 
+.BR recv (2)
+or
+.BR recvmsg (2). 
 
 Linux 2.4 introduced a number of changes for improved
 throughput and scaling, as well as enhanced functionality.
@@ -691,15 +693,24 @@ is returned.
 Returns true (i.e., 
 .I value
 is non-zero) if the inbound data stream is at the urgent mark.
-This is normally used together with
-.BR SO_OOBINLINE :
-if
+.sp
+If the 
+.BR SO_OOBINLINE 
+socket option is set, and 
 .B SIOCATMARK
-indicates we are at the urgent mark, then the
+returns true, then the
 next read from the socket will return the urgent data.
-Note that When
-.B SO_OOBINLINE
-is set, a read never reads across the urgent mark.
+If the 
+.BR SO_OOBINLINE 
+socket option is not set, and 
+.B SIOCATMARK
+returns true, then the
+next read from the socket will return the bytes following
+the urgent data (to actually read the urgent data requires the
+.B recv(MSG_OOB)
+flag).
+.sp
+Note that a read never reads across the urgent mark.
 A program can thus advance up to the mark by performing reads 
 (requesting any number of bytes) and testing
 .B SIOCATMARK