recv.2, send.2: Make names of "address" and "address length" args more consistent

Make the names of these arguments more consistent with other
sockets man pages.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/recv.2

@@ -50,7 +50,7 @@ recv, recvfrom, recvmsg \- receive a message from a socket
 .BI "ssize_t recv(int " sockfd ", void *" buf ", size_t " len ", int " flags );
 .sp
 .BI "ssize_t recvfrom(int " sockfd ", void *" buf ", size_t " len ", int " flags ,
-.BI "                 struct sockaddr *" from ", socklen_t *" fromlen );
+.BI "                 struct sockaddr *" src_addr ", socklen_t *" addrlen );
 .sp
 .BI "ssize_t recvmsg(int " sockfd ", struct msghdr *" msg ", int " flags );
 .fi
@@ -63,32 +63,32 @@ calls are used to receive messages from a socket, and may be used
 to receive data on a socket whether or not it is connection-oriented.
 .PP
 If
-.I from
+.I src_addr
 is not NULL, and the underlying protocol provides the source address,
 this source address is filled in.
 When
-.I from
+.I src_addr
 is NULL, nothing is filled in; in this case,
-.I fromlen
+.I addrlen
 is not used, and should also be NULL.
 .\" (Note: for datagram sockets in both the Unix and Internet domains,
-.\" .I from
+.\" .I src_addr
 .\" is filled in.
-.\" .I from
+.\" .I src_addr
 .\" is also filled in for stream sockets in the Unix domain, but is not
 .\" filled in for stream sockets in the Internet domain.)
 .\" [The above notes on AF_UNIX and AF_INET sockets apply as at
 .\" Kernel 2.4.18. (MTK, 22 Jul 02)]
 The argument
-.I fromlen
+.I addrlen
 is a value-result argument,
 which the caller should initialize before the call to
 the size of the buffer associated with
-.IR from ,
+.IR src_addr ,
 and modified on return to indicate the actual size of the source address.
 The returned address is truncated if the buffer provided is too small;
 in this case,
-.I fromlen
+.I addrlen
 will return a value greater than was supplied to the call.
 .PP
 The
@@ -100,7 +100,7 @@ socket (see
 and is identical to
 .BR recvfrom ()
 with a NULL
-.I from
+.I src_addr
 argument.
 .PP
 All three routines return the length of the message on successful
@@ -414,7 +414,7 @@ any data were available; see
 .TP
 .B EINVAL
 Invalid argument passed.
-.\" e.g., msg_namelen < 0 for recvmsg() or fromlen < 0 for recvfrom()
+.\" e.g., msg_namelen < 0 for recvmsg() or addrlen < 0 for recvfrom()
 .TP
 .B ENOMEM
 Could not allocate memory for
@@ -452,7 +452,7 @@ The
 .I len
 argument is \fIint\fP in 4.x BSD, but \fIsize_t\fP in libc4 and libc5.
 The
-.I fromlen
+.I addrlen
 argument is \fIint\ *\fP in 4.x BSD, libc4 and libc5.
 The present  \fIsocklen_t\ *\fP was invented by POSIX.
 See also

man2/send.2

@@ -48,7 +48,7 @@ send, sendto, sendmsg \- send a message on a socket
 
 .BI "ssize_t sendto(int " sockfd ", const void *" buf ", size_t " len \
 ", int " flags ,
-.BI "               const struct sockaddr *" to ", socklen_t " tolen );
+.BI "               const struct sockaddr *" dest_addr ", socklen_t " addrlen );
 
 .BI "ssize_t sendmsg(int " sockfd ", const struct msghdr *" msg \
 ", int " flags );
@@ -93,9 +93,9 @@ is used on a connection-mode
 .RB ( SOCK_STREAM ,
 .BR SOCK_SEQPACKET )
 socket, the arguments
-.I to
+.I dest_addr
 and
-.I tolen
+.I addrlen
 are ignored (and the error
 .B EISCONN
 may be returned when they are
@@ -103,9 +103,9 @@ not NULL and 0), and the error
 .B ENOTCONN
 is returned when the socket was not actually connected.
 Otherwise, the address of the target is given by
-.I to
+.I dest_addr
 with
-.I tolen
+.I addrlen
 specifying its size.
 For
 .BR sendmsg (),
@@ -370,7 +370,7 @@ the
 .I len
 argument was \fIint\fP in 4.x BSD and libc4, but \fIsize_t\fP in libc5;
 the
-.I tolen
+.I addrlen
 argument was \fIint\fP in 4.x BSD and libc4 and libc5.
 See also
 .BR accept (2).