Dear Ladies and Gentlemen,

This is some of the output of truss -p <ntop_pid>.

Sig 27 on this system is 
#define SIGPROF         27      /* profiling time alarm */

...

gettimeofday(0xbfa96b54,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96964,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96974,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa967e0)                            = 146364 (0x23bbc)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96624,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96634,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa96850)                            ERR#0 'Unknown
error: 0'
gettimeofday(0xbfa96b64,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96b54,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96964,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96974,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa967e0)                            = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96624,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96634,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa96850)                            = 0 (0x0)
gettimeofday(0xbfa96b64,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96b54,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96964,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96974,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa967e0)                            = 178272 (0x2b860)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96624,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96634,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa96850)                            = 248340 (0x3ca14)
gettimeofday(0xbfa96b64,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96b54,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96964,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96974,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa967e0)                            = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96624,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96634,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa96850)                            = 0 (0x0)
gettimeofday(0xbfa96b64,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96b54,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96964,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96974,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa967e0)                            = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96624,0x0)                     = 0 (0x0)
gettimeofday(0xbfa96634,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
SIGNAL 27
SIGNAL 27
gettimeofday(0x28347e88,0x0)                     = 0 (0x0)
sigprocmask(0x3,0x28347ef8,0x0)                  = 0 (0x0)
poll(0x8077000,0x1,0x0)                          = 0 (0x0)
sigreturn(0xbfa96850)                            = 282528 (0x44fa0)
gettimeofday(0xbfa96b64,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)
getpid()                                         = 92214 (0x16836)
gettimeofday(0xbfa96e44,0x0)                     = 0 (0x0)
getpid()                                         = 92214 (0x16836)

...

Yours sincerely.

-- 
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.
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