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Man page for access(3p) on posix, from the unix.com online archive.
If any access permissions are checked, each shall be checked individually, as described in the Base Definitions volume of POSIX.1‐2017, Section 4.5, File Access Permissions, except that where that description refers to execute permission for a process with appropriate privileges, an implementation may indicate success for X_OK even if execute ...
By default, faccessat () uses the real IDs (like access ()). AT_EMPTY_PATH (since Linux 5.8) If path is an empty string, operate on the file referred to by dirfd (which may have been obtained using the open (2) O_PATH flag).
Parameters ¶ filename The name of the file to be tested. flags A mask consisting of one or more of POSIX_F_OK, POSIX_R_OK, POSIX_W_OK and POSIX_X_OK. POSIX_R_OK, POSIX_W_OK and POSIX_X_OK request checking whether the file exists and has read, write and execute permissions, respectively. POSIX_F_OK just requests checking for the existence of the file.
Remarques Test d'accessibilité sans ouvrir le fichier : La fonction POSIX::access permet de vérifier les droits d'accès à un fichier ou un répertoire sans avoir à l'ouvrir ou à le manipuler directement. C'est une méthode utile pour vérifier au préalable si une opération (lecture, écriture, exécution) est possible.
2. The superuser has complete access to all files on a system. As a consequence, programs started by the superuser and switched to the effective user ID with lesser privileges cannot use access () to test their file access permissions.
Valeurs de retour Cette fonction retourne true en cas de succès ou false si une erreur survient.
