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The glibc chown (), fchown (), and lchown () wrapper functions transparently deal with the variations across kernel versions. When a new file is created (by, for example, open (2) or mkdir (2)), its owner is made the same as the file system user ID of the creating process.
The original Linux chown (), fchown (), and lchown () system calls supported only 16-bit user and group IDs. Subsequently, Linux 2.4 added chown32 (), fchown32 (), and lchown32 (), supporting 32-bit IDs. The glibc chown (), fchown (), and lchown () wrapper functions transparently deal with the variations across kernel versions.
La fonction lchown () est un outil utile en PHP pour modifier le propriétaire d'un lien symbolique vers un fichier. En suivant les étapes décrites dans ce guide, vous pouvez facilement utiliser la fonction lchown () dans vos projets PHP pour mettre à jour la propriété des liens symboliques.
Les fonctions chown (), fchown () et lchown () de la glibc qui les encapsulent gèrent de manière transparente ces différences entre noyaux. Lorsqu'un nouveau fichier est créé (par exemple avec open (2) ou mkdir (2)), son propriétaire est le même que l'UID du système de fichiers du processus créateur.
On older kernels where fchownat () is unavailable, the glibc wrapper function falls back to the use of chown () and lchown (). When pathname is a relative pathname, glibc constructs a pathname based on the symbolic link in /proc/self/fd that corresponds to the dirfd argument.
Usage notes If lchown's target is a symbolic link, it modifies the ownership of the actual symbolic link file instead of the ownership of the file pointed to by the symbolic link. The lchown service changes the owner UID and owner GID of a file. Only a superuser can change the owner UID of a file. The owner GID of a file can be changed by a superuser, or if a caller meets all of these ...
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The chown () system call clears the set-user-id and set-group-id bits on the file to prevent accidental or mischievous creation of set-user-id and set-group-id programs if not executed by the super-user. The chown () system call follows symbolic links to operate on the target of the link rather than the link itself.
