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extattr_get_file(2): clarify RETURN VALUES

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While some of the syscalls' behavior were documented and implied in the
RETURN VALUES section by earlier, e.g., the DESCRIPTION sections, as having
behavior of the other calls (`*_fd` vs `*_file` vs `*_link`), there was a lot
of implied return value behavior in the section prior to this change.

Explicitly document the syscall behavior per the current implementation in
sys/kern/vfs_extattr.c so others can better develop based on its explicit
documented behavior instead of having to digest the context of the manpage to
understand the appropriate behavior.

MFC after:	1 week
MFC with:	r368431, r368433, r368434
Sponsored by:	DellEMC Isilon
This commit is contained in:
Enji Cooper 2020-12-08 04:16:05 +00:00
parent f705523939
commit cf681016d4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=368435
1 changed files with 15 additions and 4 deletions
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19
lib/libc/sys/extattr_get_file.2
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@ -169,21 +169,32 @@ For more information on named extended attributes, please see
.Xr extattr 9 .
.Sh RETURN VALUES
If successful, the
.Fn extattr_get_fd ,
.Fn extattr_get_file ,
.Fn extattr_get_link ,
.Fn extattr_list_fd ,
.Fn extattr_list_file ,
.Fn extattr_list_link ,
.Fn extattr_set_fd ,
.Fn extattr_set_file ,
and
.Fn extattr_list_file
.Fn extattr_set_link
calls return the number of bytes
that were read or written from the
.Fa data ,
respectively, or if
respectively.
If
.Fa data
was
.Dv NULL ,
then
.Fn extattr_get_file
.Fn extattr_get_fd ,
.Fn extattr_get_file ,
.Fn extattr_get_link ,
.Fn extattr_list_fd ,
.Fn extattr_list_file ,
and
.Fn extattr_list_file
.Fn extattr_list_link
return the number of bytes available to read.
If any of the calls are unsuccessful, the value \-1 is returned
and the global variable