acl_add_perm(3) [freebsd man page]
ACL_ADD_PERM(3) BSD Library Functions Manual ACL_ADD_PERM(3) NAME
acl_add_perm -- add permissions to a permission set LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/types.h> #include <sys/acl.h> int acl_add_perm(acl_permset_t permset_d, acl_perm_t perm); DESCRIPTION
The acl_add_perm() function is a POSIX.1e call that adds the permission contained in perm to the permission set permset_d. Note: it is not considered an error to attempt to add permissions that already exist in the permission set. For POSIX.1e ACLs, valid values are: ACL_EXECUTE Execute permission ACL_WRITE Write permission ACL_READ Read permission For NFSv4 ACLs, valid values are: ACL_READ_DATA Read permission ACL_LIST_DIRECTORY Same as ACL_READ_DATA ACL_WRITE_DATA Write permission, or permission to create files ACL_ADD_FILE Same as ACL_READ_DATA ACL_APPEND_DATA Permission to create directories. Ignored for files ACL_ADD_SUBDIRECTORY Same as ACL_APPEND_DATA ACL_READ_NAMED_ATTRS Ignored ACL_WRITE_NAMED_ATTRS Ignored ACL_EXECUTE Execute permission ACL_DELETE_CHILD Permission to delete files and subdirectories ACL_READ_ATTRIBUTES Permission to read basic attributes ACL_WRITE_ATTRIBUTES Permission to change basic attributes ACL_DELETE Permission to delete the object this ACL is placed on ACL_READ_ACL Permission to read ACL ACL_WRITE_ACL Permission to change the ACL and file mode ACL_SYNCHRONIZE Ignored Calling acl_add_perm() with perm equal to ACL_WRITE or ACL_READ brands the ACL as POSIX. Calling it with ACL_READ_DATA, ACL_LIST_DIRECTORY, ACL_WRITE_DATA, ACL_ADD_FILE, ACL_APPEND_DATA, ACL_ADD_SUBDIRECTORY, ACL_READ_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS, ACL_DELETE_CHILD, ACL_READ_ATTRIBUTES, ACL_WRITE_ATTRIBUTES, ACL_DELETE, ACL_READ_ACL, ACL_WRITE_ACL or ACL_SYNCHRONIZE brands the ACL as NFSv4. RETURN VALUES
The acl_add_perm() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS
The acl_add_perm() function fails if: [EINVAL] Argument permset_d is not a valid descriptor for a permission set within an ACL entry. Argument perm does not contain a valid acl_perm_t value. ACL is already branded differently. SEE ALSO
acl(3), acl_clear_perms(3), acl_delete_perm(3), acl_get_brand_np(3), acl_get_permset(3), acl_set_permset(3), posix1e(3) STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17. HISTORY
POSIX.1e support was introduced in FreeBSD 4.0. The acl_add_perm() function was added in FreeBSD 5.0. AUTHORS
The acl_add_perm() function was written by Chris D. Faulhaber <jedgar@fxp.org>. BSD
June 25, 2009 BSD
Check Out this Related Man Page
ACL(3) BSD Library Functions Manual ACL(3) NAME
acl -- introduction to the POSIX.1e ACL security API LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/types.h> #include <sys/acl.h> DESCRIPTION
The system permits file systems to export Access Control Lists via the VFS, and provides a library for userland access to and manipulation of these ACLs. Not all file systems provide support for ACLs, and some may require that ACL support be explicitly enabled by the administrator. The library calls include routines to allocate, duplicate, retrieve, set, and validate ACLs associated with file objects. This implementation of the POSIX.1e library differs from the standard in a number of non-portable ways in order to support the MacOS/Darwin ACL semantic. Where possible, these differences are implemented using the mechanisms provided in the standard for such extensions. Where routines are non-standard, they are suffixed with _np to indicate that they are not portable. POSIX.1e describes a set of ACL manipulation routines to manage the contents of ACLs, as well as their relationships with files; almost all of these support routines are implemented. Available functions, sorted by behavior, include: acl_add_perm() This function is described in acl_add_perm(3), and may be used to add permissions to a permission set. acl_clear_perms() This function is described in acl_clear_perms(3), and may be used to clear all permissions from a permission set. acl_copy_entry() This function is described in acl_copy_entry(3), and may be used to copy the contents of an ACL entry. acl_create_entry() This function is described in acl_create_entry(3), and may be used to create an empty entry in an ACL. acl_delete_entry() This function is described in acl_delete_entry(3), and may be used to delete an entry from an ACL. acl_delete_perm() This function is described in acl_delete_perm(3), and may be used to delete permissions from a permset. acl_dup() This function is described in acl_dup(3), and may be used to duplicate an ACL structure. acl_free() This function is described in acl_free(3), and may be used to free userland working ACL storage. acl_from_text() This function is described in acl_from_text(3), and may be used to convert a text-form ACL into working ACL state, if the ACL has POSIX.1e semantics. acl_get_entry() This function is described in acl_get_entry(3), and may be used to retrieve a designated ACL entry from an ACL. acl_get_fd(), acl_get_fd_np(), acl_get_file(), acl_get_link_np() These functions are described in acl_get(3), and may be used to retrieve ACLs from file system objects. acl_get_permset() This function is described in acl_get_permset(3), and may be used to retrieve a permset from an ACL entry. acl_get_qualifier() This function is described in acl_get_qualifier(3), and may be used to retrieve the qualifier from an ACL entry. acl_get_tag_type() This function is described in acl_get_tag_type(3), and may be used to retrieve the tag type from an ACL entry. acl_init() This function is described in acl_init(3), and may be used to allocate a fresh (empty) ACL structure. acl_set_fd(), acl_set_fd_np(), acl_set_file(), acl_set_link_np() These functions are described in acl_set(3), and may be used to assign an ACL to a file system object. acl_set_permset() This function is described in acl_set_permset(3), and may be used to set the permissions of an ACL entry from a permset. acl_set_qualifier() This function is described in acl_set_qualifier(3), and may be used to set the qualifier of an ACL. acl_set_tag_type() This function is described in acl_set_tag_type(3), and may be used to set the tag type of an ACL. acl_to_text() This function is described in acl_to_text(3), and may be used to generate a text-form of a POSIX.1e semantics ACL. acl_valid(), acl_valid_fd_np(), acl_valid_file_np(), acl_valid_link_np() These functions are described in acl_valid(3), and may be used to validate an ACL as correct POSIX.1e-semantics, or as appropriate for a particular file system object regardless of semantics. The syscalls between the internal interfaces and the public library routines may change over time, and as such are not documented. They are not intended to be called directly without going through the library. SEE ALSO
ls(1), chmod(1), acl_add_perm(3), acl_clear_perms(3), acl_copy_entry(3), acl_create_entry(3), acl_delete_entry(3), acl_delete_perm(3), acl_dup(3), acl_free(3), acl_from_text(3), acl_get(3), acl_get_permset(3), acl_get_qualifier(3), acl_get_tag_type(3), acl_init(3), acl_set(3), acl_set_permset(3), acl_set_qualifier(3), acl_set_tag_type(3), acl_to_text(3), acl_valid(3), posix1e(3) UNSUPPORTED FUNCTIONS
acl_calc_mask(3), acl_delete_def_file() STANDARDS
POSIX.1e assigns security labels to all objects, extending the security functionality described in POSIX.1. These additional labels provide fine-grained discretionary access control, fine-grained capabilities, and labels necessary for mandatory access control. POSIX.2c describes a set of userland utilities for manipulating these labels. POSIX.1e is described in IEEE POSIX.1e draft 17. HISTORY
This manpage is closely derived from the FreeBSD manpage by Robert N M Watson AUTHORS
Michael Smith Robert N M Watson BSD
December 18, 2002 BSD