Provided by: libacl1-dev_2.2.52-3build1_amd64
acl_set_file — set an ACL by filename
Linux Access Control Lists library (libacl, -lacl).
#include <sys/types.h> #include <sys/acl.h> int acl_set_file(const char *path_p, acl_type_t type, acl_t acl);
The acl_set_file() function associates an access ACL with a file or directory, or associates a default ACL with a directory. The pathname for the file or directory is pointed to by the argument path_p. The effective user ID of the process must match the owner of the file or directory or the process must have the CAP_FOWNER capability for the request to succeed. The value of the argument type is used to indicate whether the access ACL or the default ACL associated with path_p is being set. If the type parameter is ACL_TYPE_ACCESS, the access ACL of path_p shall be set. If the type parameter is ACL_TYPE_DEFAULT, the default ACL of path_p shall be set. If the argument type specifies a type of ACL that cannot be associated with path_p, then the function fails. The acl parameter must reference a valid ACL according to the rules described on the acl_valid(3) manual page if the type parameter is ACL_TYPE_ACCESS, and must either reference a valid ACL or an ACL with zero ACL entries if the type parameter is ACL_TYPE_DEFAULT. If the acl parameter references an empty ACL, then the acl_set_file() function removes any default ACL associated with the directory referred to by the path_p parameter.
The acl_set_file() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
If any of the following conditions occur, the acl_set_file() function returns -1 and sets errno to the corresponding value: [EACCES] Search permission is denied for a component of the path prefix or the object exists and the process does not have appropriate access rights. Argument type specifies a type of ACL that cannot be associated with path_p. [EINVAL] The argument acl does not point to a valid ACL. The ACL has more entries than the file referred to by path_p can obtain. The type parameter is not ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT. The type parameter is ACL_TYPE_DEFAULT, but the file referred to by path_p is not a directory. [ENAMETOOLONG] The length of the argument path_p is too long. [ENOENT] The named object does not exist or the argument path_p points to an empty string. [ENOSPC] The directory or file system that would contain the new ACL cannot be extended or the file system is out of file allocation resources. [ENOTDIR] A component of the path prefix is not a directory. [ENOTSUP] The file identified by path_p cannot be associated with the ACL because the file system on which the file is located does not support this. [EPERM] The process does not have appropriate privilege to perform the operation to set the ACL. [EROFS] This function requires modification of a file system which is currently read-only.
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned) The behavior of acl_set_file() when the acl parameter refers to an empty ACL and the type parameter is ACL_TYPE_DEFAULT is an extension in the Linux implementation, in order that all values returned by acl_get_file() can be passed to acl_set_file(). The POSIX.1e function for removing a default ACL is acl_delete_def_file().
acl_delete_def_file(3), acl_get_file(3), acl_set_fd(3), acl_valid(3), acl(5)
Derived from the FreeBSD manual pages written by Robert N M Watson <rwatson@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher <firstname.lastname@example.org>.