在写perl中,调试代码要查看是谁调用谁,caller就比较方便实现这个功能
($package, $filename, $line) = caller;
返回包名、文件名、调用的行号
caller返回一数组，可以数组下标来取具体值
$cat caller.pl
#!/usr/bin/perl
#use strict;
#use warnings;
sub b{
my $sub=(caller(0))[3];
print "subroutine $sub\n";
print caller()."\n";
print caller(0);
}
&b;
$perl caller.pl
subroutine main::b
main
maincaller.pl10main::b0256 |
解释：caller(0)[3]取得是子程序名，caller中参数0代表当前堆栈
$cat caller.pl
#!/usr/bin/perl
#use strict;
#use warnings;
sub c{
my $sub=(caller(0))[3];
print "subroutine $sub\n";
print caller(1);
print "\n";
print caller(2);
print "\n";
}
sub b{
my $sub=(caller(0))[3];
print "subroutine $sub\n";
print caller(1);
print "\n";
&c
}
sub a{
my $sub=(caller(0))[3];
print "subroutine $sub\n";
&b;
}
&a;
$perl caller.pl
subroutine main::a
subroutine main::b
maincaller.pl24main::a0256
subroutine main::c
maincaller.pl22main::b0256
maincaller.pl24main::a0256 |
解释:caller(1)是返回调用者、caller(2)返回调用的调用者
参考:
http://perldoc.perl.org/functions/caller.html
http://blog.csdn.net/ace_fei/article/details/6851882