Add BACKWARD COMPATIBILITY for more post-1.0 APIs.

[skip ci]

5 files changed, 35 insertions, 0 deletions

diff --git a/pcap_datalink_val_to_name.3pcap b/pcap_datalink_val_to_name.3pcap
index 119e8b05..bbfa3f80 100644
--- a/pcap_datalink_val_to_name.3pcap
+++ b/pcap_datalink_val_to_name.3pcap
@@ -63,5 +63,14 @@ If the type value does not correspond to a known
 .B DLT_
 value, the string "DLT n" is returned, where n is the value of
 the dlt argument.
+.SH BACKWARD COMPATIBILITY
+The
+.BR pcap_datalink_val_to_description_or_dlt ()
+function first became available in libpcap release 1.10.0.  In previous
+releases,
+.BR pcap_datalink_val_to_description ()
+would have to be called and, if it returned
+.BR NULL ,
+a default string would have to be constructed.
 .SH SEE ALSO
 .BR pcap (3PCAP)
diff --git a/pcap_dump_ftell.3pcap b/pcap_dump_ftell.3pcap
index 58df7a44..062d6095 100644
--- a/pcap_dump_ftell.3pcap
+++ b/pcap_dump_ftell.3pcap
@@ -54,5 +54,11 @@ but that fit in a
 are supported, this will return the file offset without truncation.
 .B PCAP_ERROR
 is returned on error.
+.SH BACKWARD COMPATIBILITY
+The function
+.BR pcap_dump_ftell64 ()
+became available in libpcap release 1.9.0.  In previous releases, there
+was no mechanism to obtain a file offset that is too large to fit in a
+.BR long .
 .SH SEE ALSO
 .BR pcap (3PCAP)
diff --git a/pcap_get_required_select_timeout.3pcap b/pcap_get_required_select_timeout.3pcap
index e70bc02a..0256a6a5 100644
--- a/pcap_get_required_select_timeout.3pcap
+++ b/pcap_get_required_select_timeout.3pcap
@@ -160,6 +160,16 @@ should be changed to call it for each call to
 or
 .BR kevent ()
 even if the code must also work with libpcap 1.9.x.
+.SH BACKWARD COMPATIBILITY
+This function became available in libpcap release 1.9.0.  In previous
+releases,
+.BR select (),
+.BR poll (),
+.BR epoll_wait (),
+and
+.BR kevent ()
+could not be used for devices that don't provide a selectable file
+descriptor.
 .SH SEE ALSO
 .BR pcap (3PCAP),
 .BR pcap_get_selectable_fd (3PCAP),
diff --git a/pcap_init.3pcap b/pcap_init.3pcap
index ba34cc45..543f0833 100644
--- a/pcap_init.3pcap
+++ b/pcap_init.3pcap
@@ -91,5 +91,9 @@ is filled in with an appropriate error message.
 is assumed to be able to hold at least
 .B PCAP_ERRBUF_SIZE
 chars.
+.SH BACKWARD COMPATIBILITY
+This function became available in libpcap release 1.10.0.  In previous
+releases, on Windows, all strings supplied as arguments, and all strings
+returned to the caller, are in the local character encoding.
 .SH SEE ALSO
 .BR pcap (3PCAP)
diff --git a/pcap_open_dead.3pcap.in b/pcap_open_dead.3pcap.in
index e28d5bda..ced7d6cf 100644
--- a/pcap_open_dead.3pcap.in
+++ b/pcap_open_dead.3pcap.in
@@ -74,6 +74,12 @@ seconds and microseconds, and
 should be specified if the packets to be written have time stamps in
 seconds and nanoseconds.  Its value does not affect
 .BR pcap_compile (3PCAP).
+.SH BACKWARD COMPATIBILITY
+The
+.BR pcap_open_dead_with_tstamp_precision ()
+function became available in libpcap release 1.5.1.  In previous
+releases, there was no mechanism to open a savefile for writing with
+time stamps given in seconds and nanoseconds.
 .SH SEE ALSO
 .BR pcap (3PCAP),
 .BR \%pcap-linktype (@MAN_MISC_INFO@)