Filename | /usr/lib/perl/5.10/Sys/Hostname.pm |
Statements | Executed 20 statements in 977µs |
Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
---|---|---|---|---|---|
1 | 1 | 1 | 34µs | 282µs | BEGIN@17 | Sys::Hostname::
1 | 1 | 1 | 22µs | 48µs | BEGIN@3 | Sys::Hostname::
1 | 1 | 1 | 13µs | 55µs | BEGIN@5 | Sys::Hostname::
0 | 0 | 0 | 0s | 0s | hostname | Sys::Hostname::
Line | State ments |
Time on line |
Calls | Time in subs |
Code |
---|---|---|---|---|---|
1 | package Sys::Hostname; | ||||
2 | |||||
3 | 3 | 38µs | 2 | 74µs | # spent 48µs (22+26) within Sys::Hostname::BEGIN@3 which was called:
# once (22µs+26µs) by Mail::Sendmail::BEGIN@56 at line 3 # spent 48µs making 1 call to Sys::Hostname::BEGIN@3
# spent 26µs making 1 call to strict::import |
4 | |||||
5 | 3 | 144µs | 2 | 97µs | # spent 55µs (13+42) within Sys::Hostname::BEGIN@5 which was called:
# once (13µs+42µs) by Mail::Sendmail::BEGIN@56 at line 5 # spent 55µs making 1 call to Sys::Hostname::BEGIN@5
# spent 42µs making 1 call to Exporter::import |
6 | |||||
7 | 1 | 700ns | require Exporter; | ||
8 | 1 | 400ns | require AutoLoader; | ||
9 | |||||
10 | 1 | 14µs | our @ISA = qw/ Exporter AutoLoader /; | ||
11 | 1 | 600ns | our @EXPORT = qw/ hostname /; | ||
12 | |||||
13 | 1 | 200ns | our $VERSION; | ||
14 | |||||
15 | 1 | 100ns | our $host; | ||
16 | |||||
17 | # spent 282µs (34+248) within Sys::Hostname::BEGIN@17 which was called:
# once (34µs+248µs) by Mail::Sendmail::BEGIN@56 at line 27 | ||||
18 | 2 | 7µs | $VERSION = '1.11'; | ||
19 | { | ||||
20 | 3 | 10µs | local $SIG{__DIE__}; | ||
21 | 2 | 262µs | eval { | ||
22 | require XSLoader; | ||||
23 | 1 | 248µs | XSLoader::load('Sys::Hostname', $VERSION); # spent 248µs making 1 call to XSLoader::load | ||
24 | }; | ||||
25 | warn $@ if $@; | ||||
26 | } | ||||
27 | 1 | 495µs | 1 | 282µs | } # spent 282µs making 1 call to Sys::Hostname::BEGIN@17 |
28 | |||||
29 | |||||
30 | sub hostname { | ||||
31 | |||||
32 | # method 1 - we already know it | ||||
33 | return $host if defined $host; | ||||
34 | |||||
35 | # method 1' - try to ask the system | ||||
36 | $host = ghname() if defined &ghname; | ||||
37 | return $host if defined $host; | ||||
38 | |||||
39 | if ($^O eq 'VMS') { | ||||
40 | |||||
41 | # method 2 - no sockets ==> return DECnet node name | ||||
42 | eval { local $SIG{__DIE__}; $host = (gethostbyname('me'))[0] }; | ||||
43 | if ($@) { return $host = $ENV{'SYS$NODE'}; } | ||||
44 | |||||
45 | # method 3 - has someone else done the job already? It's common for the | ||||
46 | # TCP/IP stack to advertise the hostname via a logical name. (Are | ||||
47 | # there any other logicals which TCP/IP stacks use for the host name?) | ||||
48 | $host = $ENV{'ARPANET_HOST_NAME'} || $ENV{'INTERNET_HOST_NAME'} || | ||||
49 | $ENV{'MULTINET_HOST_NAME'} || $ENV{'UCX$INET_HOST'} || | ||||
50 | $ENV{'TCPWARE_DOMAINNAME'} || $ENV{'NEWS_ADDRESS'}; | ||||
51 | return $host if $host; | ||||
52 | |||||
53 | # method 4 - does hostname happen to work? | ||||
54 | my($rslt) = `hostname`; | ||||
55 | if ($rslt !~ /IVVERB/) { ($host) = $rslt =~ /^(\S+)/; } | ||||
56 | return $host if $host; | ||||
57 | |||||
58 | # rats! | ||||
59 | $host = ''; | ||||
60 | croak "Cannot get host name of local machine"; | ||||
61 | |||||
62 | } | ||||
63 | elsif ($^O eq 'MSWin32') { | ||||
64 | ($host) = gethostbyname('localhost'); | ||||
65 | chomp($host = `hostname 2> NUL`) unless defined $host; | ||||
66 | return $host; | ||||
67 | } | ||||
68 | elsif ($^O eq 'epoc') { | ||||
69 | $host = 'localhost'; | ||||
70 | return $host; | ||||
71 | } | ||||
72 | else { # Unix | ||||
73 | # is anyone going to make it here? | ||||
74 | |||||
75 | local $ENV{PATH} = '/usr/bin:/bin:/usr/sbin:/sbin'; # Paranoia. | ||||
76 | |||||
77 | # method 2 - syscall is preferred since it avoids tainting problems | ||||
78 | # XXX: is it such a good idea to return hostname untainted? | ||||
79 | eval { | ||||
80 | local $SIG{__DIE__}; | ||||
81 | require "syscall.ph"; | ||||
82 | $host = "\0" x 65; ## preload scalar | ||||
83 | syscall(&SYS_gethostname, $host, 65) == 0; | ||||
84 | } | ||||
85 | |||||
86 | # method 2a - syscall using systeminfo instead of gethostname | ||||
87 | # -- needed on systems like Solaris | ||||
88 | || eval { | ||||
89 | local $SIG{__DIE__}; | ||||
90 | require "sys/syscall.ph"; | ||||
91 | require "sys/systeminfo.ph"; | ||||
92 | $host = "\0" x 65; ## preload scalar | ||||
93 | syscall(&SYS_systeminfo, &SI_HOSTNAME, $host, 65) != -1; | ||||
94 | } | ||||
95 | |||||
96 | # method 3 - trusty old hostname command | ||||
97 | || eval { | ||||
98 | local $SIG{__DIE__}; | ||||
99 | local $SIG{CHLD}; | ||||
100 | $host = `(hostname) 2>/dev/null`; # bsdish | ||||
101 | } | ||||
102 | |||||
103 | # method 4 - use POSIX::uname(), which strictly can't be expected to be | ||||
104 | # correct | ||||
105 | || eval { | ||||
106 | local $SIG{__DIE__}; | ||||
107 | require POSIX; | ||||
108 | $host = (POSIX::uname())[1]; | ||||
109 | } | ||||
110 | |||||
111 | # method 5 - sysV uname command (may truncate) | ||||
112 | || eval { | ||||
113 | local $SIG{__DIE__}; | ||||
114 | $host = `uname -n 2>/dev/null`; ## sysVish | ||||
115 | } | ||||
116 | |||||
117 | # method 6 - Apollo pre-SR10 | ||||
118 | || eval { | ||||
119 | local $SIG{__DIE__}; | ||||
120 | my($a,$b,$c,$d); | ||||
121 | ($host,$a,$b,$c,$d)=split(/[:\. ]/,`/com/host`,6); | ||||
122 | } | ||||
123 | |||||
124 | # bummer | ||||
125 | || croak "Cannot get host name of local machine"; | ||||
126 | |||||
127 | # remove garbage | ||||
128 | $host =~ tr/\0\r\n//d; | ||||
129 | $host; | ||||
130 | } | ||||
131 | } | ||||
132 | |||||
133 | 1 | 5µs | 1; | ||
134 | |||||
135 | __END__ |