You can use this below code
use strict;
use warnings;
use POSIX qw/getpgrp tcgetpgrp/;
if (!open(TTY, "/dev/tty")) {
print "no tty\n";
} else {
my $tpgrp = tcgetpgrp(fileno(*TTY));
my $pgrp = getpgrp();
if ($tpgrp == $pgrp) {
print "foreground\n";
} else {
print "background\n";
}
}
tcgetpgrp:
The tcgetpgrp() function will return the value of the pro-
cess group ID of the foreground process group associated
with the terminal.
If there is no foreground process group, tcgetpgrp() returns
a value greater than 1 that does not match the process group
ID of any existing process group.
The tcgetpgrp() function is allowed from a process that is a
member of a background process group; however, the informa-
tion may be subsequently changed by a process that is a
member of a foreground process group.
getpgrp():
The getpgrp() function returns the process group ID of the calling process.
Upon successful completion, these functions return the pro-
cess group ID. Otherwise, getpgid() returns (pid_t)-1 and
sets errno to indicate the error.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|