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For bin/benchmark-perlformance
  Run on Fri Apr 17 15:31:48 2015
Reported on Fri Apr 17 15:32:03 2015

Filename/home/ss5/perl5/perlbrew/perls/tapper-perl/lib/5.16.3/x86_64-linux/Sys/Hostname.pm
StatementsExecuted 17 statements in 536µs
Subroutines
Calls P F Exclusive
Time
Inclusive
Time
Subroutine
11115µs26µsSys::Hostname::::BEGIN@3Sys::Hostname::BEGIN@3
11114µs133µsSys::Hostname::::BEGIN@16Sys::Hostname::BEGIN@16
1118µs40µsSys::Hostname::::BEGIN@5Sys::Hostname::BEGIN@5
0000s0sSys::Hostname::::hostnameSys::Hostname::hostname
Call graph for these subroutines as a Graphviz dot language file.
Line State
ments
Time
on line
Calls Time
in subs
Code
1package Sys::Hostname;
2
3222µs238µs
# spent 26µs (15+11) within Sys::Hostname::BEGIN@3 which was called: # once (15µs+11µs) by Benchmark::Perl::Formance::BEGIN@20 at line 3
use strict;
# spent 26µs making 1 call to Sys::Hostname::BEGIN@3 # spent 11µs making 1 call to strict::import
4
5270µs272µs
# spent 40µs (8+32) within Sys::Hostname::BEGIN@5 which was called: # once (8µs+32µs) by Benchmark::Perl::Formance::BEGIN@20 at line 5
use Carp;
# spent 40µs making 1 call to Sys::Hostname::BEGIN@5 # spent 32µs making 1 call to Exporter::import
6
71500nsrequire Exporter;
8
915µsour @ISA = qw/ Exporter /;
101400nsour @EXPORT = qw/ hostname /;
11
121100nsour $VERSION;
13
141100nsour $host;
15
16
# spent 133µs (14+118) within Sys::Hostname::BEGIN@16 which was called: # once (14µs+118µs) by Benchmark::Perl::Formance::BEGIN@20 at line 26
BEGIN {
171400ns $VERSION = '1.16';
18 {
1925µs local $SIG{__DIE__};
2011µs eval {
211400ns require XSLoader;
221124µs1118µs XSLoader::load();
# spent 118µs making 1 call to XSLoader::load
23 };
2412µs warn $@ if $@;
25 }
261302µs1133µs}
# spent 133µs making 1 call to Sys::Hostname::BEGIN@16
27
28
29sub hostname {
30
31 # method 1 - we already know it
32 return $host if defined $host;
33
34 # method 1' - try to ask the system
35 $host = ghname() if defined &ghname;
36 return $host if defined $host;
37
38 if ($^O eq 'VMS') {
39
40 # method 2 - no sockets ==> return DECnet node name
41 eval { local $SIG{__DIE__}; $host = (gethostbyname('me'))[0] };
42 if ($@) { return $host = $ENV{'SYS$NODE'}; }
43
44 # method 3 - has someone else done the job already? It's common for the
45 # TCP/IP stack to advertise the hostname via a logical name. (Are
46 # there any other logicals which TCP/IP stacks use for the host name?)
47 $host = $ENV{'ARPANET_HOST_NAME'} || $ENV{'INTERNET_HOST_NAME'} ||
48 $ENV{'MULTINET_HOST_NAME'} || $ENV{'UCX$INET_HOST'} ||
49 $ENV{'TCPWARE_DOMAINNAME'} || $ENV{'NEWS_ADDRESS'};
50 return $host if $host;
51
52 # method 4 - does hostname happen to work?
53 my($rslt) = `hostname`;
54 if ($rslt !~ /IVVERB/) { ($host) = $rslt =~ /^(\S+)/; }
55 return $host if $host;
56
57 # rats!
58 $host = '';
59 croak "Cannot get host name of local machine";
60
61 }
62 elsif ($^O eq 'MSWin32') {
63 ($host) = gethostbyname('localhost');
64 chomp($host = `hostname 2> NUL`) unless defined $host;
65 return $host;
66 }
67 elsif ($^O eq 'epoc') {
68 $host = 'localhost';
69 return $host;
70 }
71 else { # Unix
72 # is anyone going to make it here?
73
74 local $ENV{PATH} = '/usr/bin:/bin:/usr/sbin:/sbin'; # Paranoia.
75
76 # method 2 - syscall is preferred since it avoids tainting problems
77 # XXX: is it such a good idea to return hostname untainted?
78 eval {
79 local $SIG{__DIE__};
80 require "syscall.ph";
81 $host = "\0" x 65; ## preload scalar
82 syscall(&SYS_gethostname, $host, 65) == 0;
83 }
84
85 # method 2a - syscall using systeminfo instead of gethostname
86 # -- needed on systems like Solaris
87 || eval {
88 local $SIG{__DIE__};
89 require "sys/syscall.ph";
90 require "sys/systeminfo.ph";
91 $host = "\0" x 65; ## preload scalar
92 syscall(&SYS_systeminfo, &SI_HOSTNAME, $host, 65) != -1;
93 }
94
95 # method 3 - trusty old hostname command
96 || eval {
97 local $SIG{__DIE__};
98 local $SIG{CHLD};
99 $host = `(hostname) 2>/dev/null`; # bsdish
100 }
101
102 # method 4 - use POSIX::uname(), which strictly can't be expected to be
103 # correct
104 || eval {
105 local $SIG{__DIE__};
106 require POSIX;
107 $host = (POSIX::uname())[1];
108 }
109
110 # method 5 - sysV uname command (may truncate)
111 || eval {
112 local $SIG{__DIE__};
113 $host = `uname -n 2>/dev/null`; ## sysVish
114 }
115
116 # bummer
117 || croak "Cannot get host name of local machine";
118
119 # remove garbage
120 $host =~ tr/\0\r\n//d;
121 $host;
122 }
123}
124
12513µs1;
126
127__END__