+.SS fstatat()
+\fBfstatat\fP() システムコールは \fBstat\fP() と全く同様に動作するが、以下で説明する点が異なる。
+
+If the pathname given in \fIpathname\fP is relative, then it is interpreted
+relative to the directory referred to by the file descriptor \fIdirfd\fP
+(rather than relative to the current working directory of the calling
+process, as is done by \fBstat\fP() for a relative pathname).
+
+If \fIpathname\fP is relative and \fIdirfd\fP is the special value \fBAT_FDCWD\fP,
+then \fIpathname\fP is interpreted relative to the current working directory of
+the calling process (like \fBstat\fP()).
+
+If \fIpathname\fP is absolute, then \fIdirfd\fP is ignored.
+
+この \fIflags\fP 引き数は下記のフラグの 0 個以上の論理和を取ったものである:
+.TP
+\fBAT_EMPTY_PATH\fP (Linux 2.6.39 以降)
+.\" commit 65cfc6722361570bfe255698d9cd4dccaf47570d
+.\" Before glibc 2.16, defining _ATFILE_SOURCE sufficed
+If \fIpathname\fP is an empty string, operate on the file referred to by
+\fIdirfd\fP (which may have been obtained using the \fBopen\fP(2) \fBO_PATH\fP
+flag). If \fIdirfd\fP is \fBAT_FDCWD\fP, the call operates on the current working
+directory. In this case, \fIdirfd\fP can refer to any type of file, not just a
+directory. This flag is Linux\-specific; define \fB_GNU_SOURCE\fP to obtain its
+definition.
+.TP
+\fBAT_NO_AUTOMOUNT\fP (Linux 2.6.38 以降)
+.\" Before glibc 2.16, defining _ATFILE_SOURCE sufficed
+Don't automount the terminal ("basename") component of \fIpathname\fP if it is
+a directory that is an automount point. This allows the caller to gather
+attributes of an automount point (rather than the location it would mount).
+This flag can be used in tools that scan directories to prevent
+mass\-automounting of a directory of automount points. The
+\fBAT_NO_AUTOMOUNT\fP flag has no effect if the mount point has already been
+mounted over. This flag is Linux\-specific; define \fB_GNU_SOURCE\fP to obtain
+its definition.
+.TP
+\fBAT_SYMLINK_NOFOLLOW\fP
+If \fIpathname\fP is a symbolic link, do not dereference it: instead return
+information about the link itself, like \fBlstat\fP(). (By default,
+\fBfstatat\fP() dereferences symbolic links, like \fBstat\fP().)
+.PP
+See \fBopenat\fP(2) for an explanation of the need for \fBfstatat\fP().
OSDN Git Service
