09-13-2011
POSIX specifies programming APIs. It is silent on the implementation of those APIs.
However, the behavior you see if what I would expect. Writes by their very nature are going to take longer than reads. Reads can come from cache. Writes cannot.
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sir,
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LEARN ABOUT FREEBSD
acl_is_trivial_np
ACL_STRIP_NP(3) BSD Library Functions Manual ACL_STRIP_NP(3)
NAME
acl_is_trivial_np -- determine whether ACL is trivial
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h>
int
acl_is_trivial_np(const acl_t aclp, int *trivialp);
DESCRIPTION
The acl_is_trivial() function determines whether the ACL pointed to by the argument acl is trivial. Upon successful completion, the location
referred to by the argument trivialp will be set to 1, if the ACL aclp points to is trivial, or 0 if it's not.
ACL is trivial if it can be fully expressed as a file mode without losing any access rules. For POSIX.1e ACLs, ACL is trivial if it has the
three required entries, one for owner, one for owning group, and one for other. For NFSv4 ACLs, ACL is trivial if it is identical to the ACL
generated by acl_strip_np(3). Files that have non-trivial ACL have a plus sign appended after mode bits in "ls -l" output.
RETURN VALUES
The acl_get_tag_type() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to
indicate the error.
SEE ALSO
acl(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. The acl_is_trivial_np() function was added in FreeBSD 8.0.
AUTHORS
Edward Tomasz Napierala <trasz@FreeBSD.org>
BSD
November 12, 2013 BSD