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acl_get_fd, acl_get_fd_np, acl_get_file, acl_get_link_np - get an ACL for

 

NAME

      acl_get_fd, acl_get_fd_np, acl_get_file, acl_get_link_np - get an ACL for
      a file
 

LIBRARY

      Standard C Library (libc, -lc)
 

SYNOPSIS

      #include <sys/types.h>
      #include <sys/acl.h>
 
      acl_t
      acl_get_fd(int fd);
 
      acl_t
      acl_get_fd_np(int fd, acl_type_t type);
 
      acl_t
      acl_get_file(const char *path_p, acl_type_t type);
 
      acl_t
      acl_get_link_np(const char *path_p, acl_type_t type);
 

DESCRIPTION

      The acl_get_fd(), acl_get_file(), acl_get_link_np(), and acl_get_fd_np()
      each allow the retrieval of an ACL from a file.  The acl_get_fd() is a
      POSIX.1e call that allows the retrieval of an ACL of type ACL_TYPE_ACCESS
      from a file descriptor.  The acl_get_fd_np() function is a non-portable
      form of acl_get_fd() that allows the retrieval of any type of ACL from a
      file descriptor.  The acl_get_file() function is a POSIX.1e call that
      allows the retrieval of a specified type of ACL from a file by name;
      acl_get_link_np() is a non-portable variation on acl_get_file() which
      does not follow a symlink if the target of the call is a symlink.
 
      These functions may cause memory to be allocated.  The caller should free
      any releasable memory, when the new ACL is no longer required, by calling
      acl_free(3) with the (void *)acl_t as an argument.
 
      The ACL in the working storage is an independent copy of the ACL associ‐
      ated with the object referred to by fd.  The ACL in the working storage
      shall not participate in any access control decisions.
      FreeBSD’s support for POSIX.1e interfaces and features is still under
      development at this time.
      Upon successful completion, the function shall return a pointer to the
      ACL that was retrieved.  Otherwise, a value of (acl_t)NULL shall be
      returned, and errno shall be set to indicate the error.
 

ERRORS

      If any of the following conditions occur, the acl_get_fd() function shall
      return a value of (acl_t)NULL and set 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.
 
      [EBADF]            The fd argument is not a valid file descriptor.
 
      [EINVAL]           The ACL type passed is invalid for this file object.
 
      [ENAMETOOLONG]     A component of a pathname exceeded 255 characters, or
                         an entire path name exceeded 1023 characters.
 
      [ENOENT]           The named object does not exist, or the path_p argu‐
                         ment points to an empty string.
 
      [ENOMEM]           Insufficient memory available to fulfill request.
 
      [EOPNOTSUPP]       The file system does not support ACL retrieval.
      acl(3), acl_free(3), acl_get(3), acl_set(3), posix1e(3)
 

STANDARDS

      POSIX.1e is described in IEEE POSIX.1e draft 17.  Discussion of the draft
      continues on the cross-platform POSIX.1e implementation mailing list.  To
      join this list, see the FreeBSD POSIX.1e implementation page for more
      information.
 

HISTORY

      POSIX.1e support was introduced in FreeBSD 4.0, and development contin‐
      ues.
 

AUTHORS

      Robert N M Watson
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.