netstat: optional -p support by L. Gabriel Somlo <somlo AT cmu.edu>

Without FEATURE_NETSTAT_PRG:
function                                             old     new   delta
recursive_action                                     416     425      +9
tcp_do_one                                           420     428      +8
udp_do_one                                           492     499      +7
raw_do_one                                           472     479      +7
expand                                              1697    1701      +4
netstat_main                                         489     492      +3
unix_do_one                                          486     488      +2
flags                                                  1       -      -1
qgravechar                                           109     106      -3
net_conn_line                                          4       -      -4
bbunpack                                             391     383      -8
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 7/2 up/down: 40/-16)             Total: 24 bytes

With FEATURE_NETSTAT_PRG:
file_act                                               -     213    +213
dir_act                                                -     192    +192
netstat_main                                         489     601    +112
prg_cache_get                                          -      50     +50
tcp_do_one                                           420     462     +42
udp_do_one                                           492     533     +41
raw_do_one                                           472     513     +41
unix_do_one                                          486     519     +33
recursive_action                                     416     425      +9
expand                                              1697    1701      +4
flags                                                  1       -      -1
qgravechar                                           109     106      -3
net_conn_line                                          4       -      -4
bbunpack                                             391     383      -8
packed_usage                                       24586   24572     -14
------------------------------------------------------------------------------
(add/remove: 3/2 grow/shrink: 7/3 up/down: 737/-30)           Total: 707 bytes

2 files changed, 5 insertions, 1 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 48cbd90c0..2dcdeacb1 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -278,6 +278,7 @@ enum {
         ACTION_FOLLOWLINKS_L0 = (1 << 2),
         ACTION_DEPTHFIRST     = (1 << 3),
         /*ACTION_REVERSE      = (1 << 4), - unused */
+        ACTION_QUIET          = (1 << 5),
 };
 extern int recursive_action(const char *fileName, unsigned flags,
         int FAST_FUNC (*fileAction)(const char *fileName, struct stat* statbuf, void* userData, int depth),
diff --git a/include/usage.h b/include/usage.h
index 9a73d0890..110fbf641 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2820,7 +2820,7 @@
 #endif
 
 #define netstat_trivial_usage \
-       "[-laentuwxr"USE_FEATURE_NETSTAT_WIDE("W")"]"
+       "[-laentuwxr"USE_FEATURE_NETSTAT_WIDE("W")USE_FEATURE_NETSTAT_PRG("p")"]"
 #define netstat_full_usage "\n\n" \
        "Display networking information\n" \
      "\nOptions:" \
@@ -2835,6 +2835,9 @@
      "\n        -r      Display routing table" \
         USE_FEATURE_NETSTAT_WIDE( \
      "\n        -W      Display with no column truncation" \
+        ) \
+        USE_FEATURE_NETSTAT_PRG( \
+     "\n        -p      Display PID/Program name for sockets" \
         )
 
 #define nice_trivial_usage \