NAME¶
acl_get_fd
—
get an ACL by file descriptor
LIBRARY¶
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS¶
#include
<sys/types.h>
#include
<sys/acl.h>
acl_t
acl_get_fd
(
int
fd);
DESCRIPTION¶
The
acl_get_fd
() function retrieves the
access ACL associated with the file referred to by
fd. The ACL is placed into working storage
and
acl_get_fd
() returns a pointer to that
storage.
In order to read an ACL from an object, a process must have read access to the
object's attributes.
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
acl_free(3) with the
(void*)acl_t returned by
acl_get_fd
() as an argument.
RETURN VALUE¶
On success, this function shall return a pointer to the working storage. On
error, a value of
(acl_t)NULL
shall be returned, and
errno is set appropriately.
ERRORS¶
If any of the following conditions occur, the
acl_get_fd
() function returns a value of
(acl_t)NULL
and sets
errno to the corresponding value:
- [
EBADF
]
- The fd argument is not a valid file
descriptor.
- [
ENOMEM
]
- The ACL working storage requires more memory than is allowed by the
hardware or system-imposed memory management constraints.
- [
ENOTSUP
]
- The file system on which the file identified by
fd is located does not support ACLs, or
ACLs are disabled.
STANDARDS¶
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
SEE ALSO¶
acl_free(3),
acl_get_entry(3),
acl_get_file(3),
acl_set_fd(3),
acl(5)
AUTHOR¶
Derived from the FreeBSD manual pages written by
Robert N M Watson
⟨rwatson@FreeBSD.org⟩, and adapted for Linux by
Andreas Gruenbacher
⟨a.gruenbacher@bestbits.at⟩.