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As -yy parser, compared to -y, needs to do at least 5 extra syscalls
(getxattr, socket, sendmsg, recvmsg, close) to print socket details,
caching results of netlink conversations between strace and kernel
noticeably reduces amount of system time spent by strace.
The caching is safe since sockets do not change their addresses after
successful bind or connect syscall.
* defs.h (string_quote, print_sockaddr_by_inode_cached): New prototypes.
* socketutils.c (cache_entry): New type.
(CACHE_SIZE, CACHE_MASK): New macros.
(cache): New static array.
(cache_and_print_inode_details): New static function.
(print_sockaddr_by_inode_cached): New function.
(inet_parse_response, unix_parse_response): Use
cache_and_print_inode_details.
* util.c (printfd): Use string_quote and print_sockaddr_by_inode_cached.
(string_quote): Remove static qualifier.
* NEWS: Mention this improvement.
* tests/unix-yy.c (main): Update.
Unlike the former test that was based on match_awk,
the new one uses match_diff and does more rigorous testing.
* tests/net-yy-unix.c: New file.
* tests/net-yy-unix.test: New test.
* tests/unix-yy.test: Remove.
* tests/unix-yy-accept.awk: Remove.
* tests/unix-yy-connect.awk: Remove.
* tests/.gitignore: Add net-yy-unix.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(TESTS): Replace unix-yy.test with net-yy-unix.test.
(EXTRA_DIST): Remove unix-yy-accept.awk and unix-yy-connect.awk.
