.\" Access Control Lists manual pages .\" .\" (C) 2002 Andreas Gruenbacher, .\" .\" This is free documentation; you can redistribute it and/or .\" modify it under the terms of the GNU General Public License as .\" published by the Free Software Foundation; either version 2 of .\" the License, or (at your option) any later version. .\" .\" The GNU General Public License's references to "object code" .\" and "executables" are to be interpreted as the output of any .\" document formatting or typesetting system, including .\" intermediate and printed output. .\" .\" This manual is distributed in the hope that it will be useful, .\" but WITHOUT ANY WARRANTY; without even the implied warranty of .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the .\" GNU General Public License for more details. .\" .\" You should have received a copy of the GNU General Public .\" License along with this manual. If not, see .\" . .\" .Dd March 23, 2002 .Dt ACL_GET_FD 3 .Os "Linux ACL" .Sh NAME .Nm acl_get_fd .Nd get an ACL by file descriptor .Sh LIBRARY Linux Access Control Lists library (libacl, \-lacl). .Sh SYNOPSIS .In sys/types.h .In sys/acl.h .Ft acl_t .Fn acl_get_fd "int fd" .Sh DESCRIPTION The .Fn acl_get_fd function retrieves the access ACL associated with the file referred to by .Va fd . The ACL is placed into working storage and .Fn acl_get_fd returns a pointer to that storage. .Pp In order to read an ACL from an object, a process must have read access to the object's attributes. .Pp This function may cause memory to be allocated. The caller should free any releasable memory, when the new ACL is no longer required, by calling .Xr acl_free 3 with the .Va (void*)acl_t returned by .Fn acl_get_fd as an argument. .Sh RETURN VALUE On success, this function shall return a pointer to the working storage. On error, a value of .Li (acl_t)NULL shall be returned, and .Va errno is set appropriately. .Sh ERRORS If any of the following conditions occur, the .Fn acl_get_fd function returns a value of .Li (acl_t)NULL and sets .Va errno to the corresponding value: .Bl -tag -width Er .It Bq Er EBADF The .Va fd argument is not a valid file descriptor. .It Bq Er ENOMEM The ACL working storage requires more memory than is allowed by the hardware or system-imposed memory management constraints. .It Bq Er ENOTSUP The file system on which the file identified by .Va fd is located does not support ACLs, or ACLs are disabled. .El .Sh STANDARDS IEEE Std 1003.1e draft 17 (\(lqPOSIX.1e\(rq, abandoned) .Sh SEE ALSO .Xr acl_free 3 , .Xr acl_get_entry 3 , .Xr acl_get_file 3 , .Xr acl_set_fd 3 , .Xr acl 5 .Sh AUTHOR Derived from the FreeBSD manual pages written by .An "Robert N M Watson" Aq rwatson@FreeBSD.org , and adapted for Linux by .An "Andreas Gruenbacher" Aq andreas.gruenbacher@gmail.com .