mirror of https://github.com/mkerrisk/man-pages
111 lines
2.9 KiB
Groff
111 lines
2.9 KiB
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
|
|
.\"
|
|
.\" This manpage is Copyright (C) 2006, Michael Kerrisk
|
|
.\"
|
|
.\" Permission is granted to make and distribute verbatim copies of this
|
|
.\" manual provided the copyright notice and this permission notice are
|
|
.\" preserved on all copies.
|
|
.\"
|
|
.\" Permission is granted to copy and distribute modified versions of this
|
|
.\" manual under the conditions for verbatim copying, provided that the
|
|
.\" entire resulting derived work is distributed under the terms of a
|
|
.\" permission notice identical to this one.
|
|
.\"
|
|
.\" Since the Linux kernel and libraries are constantly changing, this
|
|
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
|
.\" responsibility for errors or omissions, or for damages resulting from
|
|
.\" the use of the information contained herein. The author(s) may not
|
|
.\" have taken the same level of care in the production of this manual,
|
|
.\" which is licensed free of charge, as they might when working
|
|
.\" professionally.
|
|
.\"
|
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
.\" the source, must acknowledge the copyright and authors of this work.
|
|
.\"
|
|
.\"
|
|
.TH MKNODAT 2 2006-04-06 "Linux 2.6.16" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
mknodat \- create a special or ordinary file relative to a directory
|
|
file descriptor
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.B #define _ATFILE_SOURCE
|
|
.B #include <sys/stat.h>
|
|
.sp
|
|
.BI "int mknodat(int " dirfd ", const char *" pathname ", mode_t " mode \
|
|
", dev_t " dev );
|
|
.fi
|
|
.SH DESCRIPTION
|
|
The
|
|
.BR mknodat ()
|
|
system call operates in exactly the same way as
|
|
.BR mknod (2),
|
|
except for the differences described in this manual page.
|
|
|
|
If the pathname given in
|
|
.I pathname
|
|
is relative, then it is interpreted relative to the directory
|
|
referred to by the file descriptor
|
|
.IR dirfd
|
|
(rather than relative to the current working directory of
|
|
the calling process, as is done by
|
|
.BR mknod (2)
|
|
for a relative pathname).
|
|
|
|
If
|
|
.I pathname
|
|
is relative and
|
|
.I dirfd
|
|
is the special value
|
|
.BR AT_FDCWD ,
|
|
then
|
|
.I pathname
|
|
is interpreted relative to the current working
|
|
directory of the calling process (like
|
|
.BR mknod (2)).
|
|
|
|
If
|
|
.IR pathname
|
|
is absolute, then
|
|
.I dirfd
|
|
is ignored.
|
|
.SH "RETURN VALUE"
|
|
On success,
|
|
.BR mknodat ()
|
|
returns 0.
|
|
On error, \-1 is returned and
|
|
.I errno
|
|
is set to indicate the error.
|
|
.SH ERRORS
|
|
The same errors that occur for
|
|
.BR mknod (2)
|
|
can also occur for
|
|
.BR mknodat ().
|
|
The following additional errors can occur for
|
|
.BR mknodat ():
|
|
.TP
|
|
.B EBADF
|
|
.I dirfd
|
|
is not a valid file descriptor.
|
|
.TP
|
|
.B ENOTDIR
|
|
.I pathname
|
|
is relative and
|
|
.I dirfd
|
|
is a file descriptor referring to a file other than a directory.
|
|
.SH NOTES
|
|
See
|
|
.BR openat (2)
|
|
for an explanation of the need for
|
|
.BR mknodat ().
|
|
.SH "CONFORMING TO"
|
|
This system call is non-standard but is proposed
|
|
for inclusion in a future revision of POSIX.1.
|
|
.SH VERSIONS
|
|
.BR mknodat ()
|
|
was added to Linux in kernel 2.6.16.
|
|
.SH "SEE ALSO"
|
|
.BR mknod (2),
|
|
.BR openat (2),
|
|
.BR path_resolution (2)
|