Unix Programming FAQ How do I 'lock' a file? []

Questions and Answers

chown(8) - change file owner and group {oss}

chroot(8) - change root directory {oss}

sticky(8) - sticky text and append-only directories {oss}

Fileutils - are: 'chgrp', 'chmod', 'chown', 'cp', 'dd', 'df', 'dir', 'dircolors', 'du', 'install', 'ln', 'ls', 'mkdir', 'mkfifo', 'mknod', 'mv', 'rm', 'rmdir', 'sync', 'touch', and 'vdir'. {GPL,GNU}

cpmod - Copy modes/ownerships/times {oss}

chown - Improved and expanded chown/chgrp {oss}

give - Give away ownership of files (System III/V specific) {oss}

access - Kernal Hacks for access control lists {oss}

lockf (3) - record locking on files {oss}

flock (2) - apply or remove an advisory lock on an open file {oss}

access (2) - check access permissions of a file or pathname {oss}

chflags fchflags (2) - set file flags {oss}

chmod fchmod (2) - change mode of file {oss}

chown lchown fchown (2) - change owner and group of a file or link {oss}

umask (2) - set file creation mode mask {oss}

acl_canonicalize_principal acl_check acl_exact_match acl_add acl_delete acl_initialize (3) - Access control list routines {oss}

getmode setmode (3) - modify mode bits {oss}

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

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

p5-LockFile-Simple-0.2.5 - Perl module implementing simple file locking

Isshare.C - Determine if file sharing is enabled {oss}

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}

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.

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}

Libraries and Functions

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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.