CODEWITHSUNDEEP
linuxshellperlaix
Balaji Dongare
Balaji Dongare

Reputation: 67

How to prevent others for read /write on the file, while it is writing

I wanted to put a lock while one process is writing on the text file. so no other process can read or write.

Upvotes: 1

Views: 1231

Answers (1)

mob
mob

Reputation: 118645

The flock file locking mechanism in Perl is advisory. It can be used to exclude other processes from accessing a file if those other processes are also using flock. Even this mechanism will be flaky with some systems (I'm looking at you, NFS).

It may be more reliable to operate with an anonymous, temporary file that other processes will not know about, and to rename your file when you are done with it.

use File::Temp;

my ($fh, $obscure_filename) = tempfile();
print $fh "some data ...\n";
...
close $fh;
rename($obscure_filename, $the_real_name_of_the_file);

Upvotes: 4

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