symlink(7): Add lpathconf(2) and *at system calls.

MFC after:	1 week

1 files changed, 27 insertions, 2 deletions

diff --git a/bin/ln/symlink.7 b/bin/ln/symlink.7
index 93bb27b..8c09f28 100644
--- a/bin/ln/symlink.7
+++ b/bin/ln/symlink.7
@@ -103,19 +103,23 @@ the system call
 would return a file descriptor to the file
 .Dq afile .
 .Pp
-There are nine system calls that do not follow links, and which operate
+There are thirteen system calls that do not follow links, and which operate
 on the symbolic link itself.
 They are:
 .Xr lchflags 2 ,
 .Xr lchmod 2 ,
 .Xr lchown 2 ,
+.Xr lpathconf 2 ,
 .Xr lstat 2 ,
 .Xr lutimes 2 ,
 .Xr readlink 2 ,
+.Xr readlinkat 2 ,
 .Xr rename 2 ,
+.Xr renameat 2 ,
 .Xr rmdir 2 ,
+.Xr unlink 2 ,
 and
-.Xr unlink 2 .
+.Xr unlinkat 2 .
 Because
 .Xr remove 3
 is an alias for
@@ -123,9 +127,30 @@ is an alias for
 it also does not follow symbolic links.
 When
 .Xr rmdir 2
+or
+.Xr unlinkat 2
+with the
+.Dv AT_REMOVEDIR
+flag
 is applied to a symbolic link, it fails with the error
 .Er ENOTDIR .
 .Pp
+The
+.Xr linkat 2
+system call does not follow symbolic links
+unless given the
+.Dv AT_SYMLINK_FOLLOW
+flag.
+.Pp
+The following system calls follow symbolic links
+unless given the
+.Dv AT_SYMLINK_NOFOLLOW
+flag:
+.Xr fchmodat 2 ,
+.Xr fchownat 2
+and
+.Xr fstatat 2 .
+.Pp
 The owner and group of an existing symbolic link can be changed by
 means of the
 .Xr lchown 2