See also Process Limits: File Access - Process Limits on File access (permissions, ownership, modes, et al)

See also: File Information - Obtaining file information (status, configuration, et al)

Up to File System Access - Gateway topic to file system (files and directory) access and operations.

(Perl delta 5.003 to 5.004) flock No qualified books.

How can I lock a file?

What can't I just open(FH, ">file.lock")?

I still don't get locking. I just want to increment the number in the file. How can I do this?

See Also

(Perl builtin function) chmod LIST Changes the permissions of a list of files.

(Perl builtin function) chown LIST Changes the owner (and group) of a list of files.

(Perl builtin function) chroot FILENAME makes the named directory the new root directory.

(Perl builtin function) flock FILEHANDLE,OPERATION Calls flock(2), or an emulation of it, on FILEHANDLE.

(Perl builtin function) umask EXPR Sets the umask

perl5 module for file locking (flock,fcntl). p5-File-Lock-0.9 Perl5 module for file locking (flock,fcntl)

perl5 module for file locking with flock. p5-File-BasicFlock-98.1202 Perl5 module for file locking with flock

File::CounterFile - Maintains a persistent counter in the filesystem. You increment it and decrement it from your Perl script, and it remembers the value forever. Uses file locking. Now part of the libwww bundle. [Perl] {oss}

File::Flock - A wrapper around the flock() call. flock() implements file locking, which prevents two processes from writing to the same file at the same time. (When that happens, all data is often lost.) Also see the File::Lock module. [Perl] {oss}

File::Lockf - A wrapper around the lockf() system call. lockf() implements file locking just like File::Lock and fcntl(), but without flock()'s inability to handle network locks or the ugliness of fcntl() [Perl] {oss}

Fcntl - The Fcntl ("File Control") module provides low level access to system calls for manipulating files (more properly, file descriptors). It comes bundled with Perl.

Other Libraries, Functions, and Components