prefer POSIX::uname() rather than syscalls, which require attempting

to load syscall.ph (from David Huggins-Daines <dhd@eradicator.org>)

p4raw-id: //depot/perl@4851

1 files changed, 16 insertions, 16 deletions

diff --git a/lib/Sys/Hostname.pm b/lib/Sys/Hostname.pm
index 4d93f91f9e..87d10520df 100644
--- a/lib/Sys/Hostname.pm
+++ b/lib/Sys/Hostname.pm
@@ -71,44 +71,44 @@ sub hostname {
   }
   else {  # Unix
 
-    # method 2 - syscall is preferred since it avoids tainting problems
+    # method 2 - use POSIX.pm, prefer the standard library to system calls
     eval {
 	local $SIG{__DIE__};
-	{
-	    package main;
-	    require "syscall.ph";
-	}
+	require POSIX;
+	$host = (POSIX::uname())[1];
+    }
+    # method 3 - otherwise syscall is preferred since it avoids tainting problems
+    || eval {
+	local $SIG{__DIE__};
+	require "syscall.ph";
 	$host = "\0" x 65; ## preload scalar
-	syscall(&main::SYS_gethostname, $host, 65) == 0;
+	syscall(&SYS_gethostname, $host, 65) == 0;
     }
 
-    # method 2a - syscall using systeminfo instead of gethostname
+    # method 3a - syscall using systeminfo instead of gethostname
     #           -- needed on systems like Solaris
     || eval {
 	local $SIG{__DIE__};
-	{
-	    package main;
-	    require "sys/syscall.ph";
-	    require "sys/systeminfo.ph";
-	}
+	require "sys/syscall.ph";
+	require "sys/systeminfo.ph";
 	$host = "\0" x 65; ## preload scalar
-	syscall(&main::SYS_systeminfo, &main::SI_HOSTNAME, $host, 65) != -1;
+	syscall(&SYS_systeminfo, &SI_HOSTNAME, $host, 65) != -1;
     }
 
-    # method 3 - trusty old hostname command
+    # method 4 - trusty old hostname command
     || eval {
 	local $SIG{__DIE__};
 	local $SIG{CHLD};
 	$host = `(hostname) 2>/dev/null`; # bsdish
     }
 
-    # method 4 - sysV uname command (may truncate)
+    # method 5 - sysV uname command (may truncate)
     || eval {
 	local $SIG{__DIE__};
 	$host = `uname -n 2>/dev/null`; ## sysVish
     }
 
-    # method 5 - Apollo pre-SR10
+    # method 6 - Apollo pre-SR10
     || eval {
 	local $SIG{__DIE__};
 	($host,$a,$b,$c,$d)=split(/[:\. ]/,`/com/host`,6);