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| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | manual/filesys.texi | 30 |
2 files changed, 33 insertions, 1 deletions
@@ -1,3 +1,7 @@ +2017-11-03 Florian Weimer <fweimer@redhat.com> + + * manual/filesys.texi (Hard Links): Document linkat. + 2017-11-03 Joseph Myers <joseph@codesourcery.com> * math/tgmath.h [__HAVE_DISTINCT_FLOAT16 diff --git a/manual/filesys.texi b/manual/filesys.texi index 5f7eb0e231..ca77996902 100644 --- a/manual/filesys.texi +++ b/manual/filesys.texi @@ -1205,6 +1205,35 @@ A hardware error occurred while trying to read or write the to filesystem. @end table @end deftypefun +@deftypefun int linkat (int oldfd, const char *@var{oldname}, int newfd, const char *@var{newname}, int flags) +@standards{POSIX.1, unistd.h} +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} + +The @code{linkat} function is analogous to the @code{link} function, +except that it identifies its source and target using a combination of a +file descriptor (referring to a directory) and a pathname. If a +pathnames is not absolute, it is resolved relative to the corresponding +file descriptor. The special file descriptor @code{AT_FDCWD} denotes +the current directory. + +The @var{flags} argument is a combination of the following flags: + +@table @code +@item AT_SYMLINK_FOLLOW +If the source path identified by @var{oldfd} and @var{oldname} is a +symbolic link, @code{linkat} follows the symbolic link and creates a +link to its target. If the flag is not set, a link for the symbolic +link itself is created; this is not supported by all file systems and +@code{linkat} can fail in this case. + +@item AT_EMPTY_PATH +If this flag is specified, @var{oldname} can be an empty string. In +this case, a new link to the file denoted by the descriptor @var{oldfd} +is created, which may have been opened with @code{O_PATH} or +@code{O_TMPFILE}. This flag is a GNU extension. +@end table +@end deftypefun + @node Symbolic Links @section Symbolic Links @cindex soft link @@ -3515,7 +3544,6 @@ The @code{mkdtemp} function comes from OpenBSD. @c fchownat @c futimesat @c fstatat (there's a commented-out safety assessment for this one) -@c linkat @c mkdirat @c mkfifoat @c name_to_handle_at |