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mknod.2: Merge text of mknodat(2)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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man2/mknod.2
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man2/mknod.2
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.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
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.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
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.\" and Copyright (C) 1993 Michael Haardt
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.\" and Copyright (C) 1993 Michael Haardt
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.\" and Copyright (C) 1993,1994 Ian Jackson.
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.\" and Copyright (C) 1993,1994 Ian Jackson
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.\" and Copyright (C) 2006, 2014, Michael Kerrisk
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.\"
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.\"
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" You may distribute it under the terms of the GNU General
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.\" You may distribute it under the terms of the GNU General
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@ -11,9 +12,9 @@
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.\" Modified 2003-04-23 by Michael Kerrisk
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.\" Modified 2003-04-23 by Michael Kerrisk
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.\" Modified 2004-06-23 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Modified 2004-06-23 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\"
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.TH MKNOD 2 2013-01-27 "Linux" "Linux Programmer's Manual"
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.TH MKNOD 2 2014-02-21 "Linux" "Linux Programmer's Manual"
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.SH NAME
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.SH NAME
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mknod \- create a special or ordinary file
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mknod, mknodat \- create a special or ordinary file
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.SH SYNOPSIS
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.SH SYNOPSIS
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.nf
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.nf
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.B #include <sys/types.h>
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.B #include <sys/types.h>
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@ -22,6 +23,12 @@ mknod \- create a special or ordinary file
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.B #include <unistd.h>
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.B #include <unistd.h>
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.sp
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.sp
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.BI "int mknod(const char *" pathname ", mode_t " mode ", dev_t " dev );
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.BI "int mknod(const char *" pathname ", mode_t " mode ", dev_t " dev );
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.sp
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.BR "#include <fcntl.h> " "/* Definition of AT_* constants */"
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.B #include <sys/stat.h>
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.sp
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.BI "int mknodat(int " dirfd ", const char *" pathname ", mode_t " mode \
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", dev_t " dev );
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.fi
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.fi
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.sp
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.sp
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.in -4n
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.in -4n
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@ -98,9 +105,52 @@ If the directory containing the node has the set-group-ID
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bit set, or if the filesystem is mounted with BSD group semantics, the
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bit set, or if the filesystem is mounted with BSD group semantics, the
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new node will inherit the group ownership from its parent directory;
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new node will inherit the group ownership from its parent directory;
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otherwise it will be owned by the effective group ID of the process.
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otherwise it will be owned by the effective group ID of the process.
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.\"
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.\"
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.SS mknodat()
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The
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.BR mknodat ()
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system call operates in exactly the same way as
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.BR mknod (2),
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except for the differences described here.
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If the pathname given in
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.I pathname
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is relative, then it is interpreted relative to the directory
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referred to by the file descriptor
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.I dirfd
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(rather than relative to the current working directory of
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the calling process, as is done by
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.BR mknod (2)
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for a relative pathname).
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If
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.I pathname
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is relative and
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.I dirfd
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is the special value
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.BR AT_FDCWD ,
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then
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.I pathname
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is interpreted relative to the current working
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directory of the calling process (like
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.BR mknod (2)).
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If
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.I pathname
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is absolute, then
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.I dirfd
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is ignored.
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.PP
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See
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.BR openat (2)
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for an explanation of the need for
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.BR mknodat ().
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.SH RETURN VALUE
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.SH RETURN VALUE
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.BR mknod ()
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.BR mknod ()
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returns zero on success, or \-1 if an error occurred (in which case,
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and
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.BR mknodat ()
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return zero on success, or \-1 if an error occurred (in which case,
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.I errno
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.I errno
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is set appropriately).
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is set appropriately).
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.SH ERRORS
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.SH ERRORS
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@ -174,11 +224,32 @@ does not support the type of node requested.
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.B EROFS
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.B EROFS
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.I pathname
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.I pathname
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refers to a file on a read-only filesystem.
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refers to a file on a read-only filesystem.
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.PP
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The following additional errors can occur for
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.BR mknodat ():
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.TP
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.B EBADF
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.I dirfd
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is not a valid file descriptor.
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.TP
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.B ENOTDIR
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.I pathname
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is relative and
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.I dirfd
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is a file descriptor referring to a file other than a directory.
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.SH VERSIONS
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.BR mknodat ()
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was added to Linux in kernel 2.6.16;
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library support was added to glibc in version 2.4.
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.SH CONFORMING TO
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.SH CONFORMING TO
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.BR mknod ():
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SVr4, 4.4BSD, POSIX.1-2001 (but see below).
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SVr4, 4.4BSD, POSIX.1-2001 (but see below).
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.\" The Linux version differs from the SVr4 version in that it
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.\" The Linux version differs from the SVr4 version in that it
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.\" does not require root permission to create pipes, also in that no
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.\" does not require root permission to create pipes, also in that no
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.\" EMULTIHOP, ENOLINK, or EINTR error is documented.
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.\" EMULTIHOP, ENOLINK, or EINTR error is documented.
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.BR mknodat ():
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POSIX.1-2008.
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.SH NOTES
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.SH NOTES
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POSIX.1-2001 says: "The only portable use of
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POSIX.1-2001 says: "The only portable use of
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.BR mknod ()
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.BR mknod ()
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@ -211,7 +282,6 @@ Some of these affect
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.BR chown (2),
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.BR chown (2),
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.BR fcntl (2),
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.BR fcntl (2),
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.BR mkdir (2),
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.BR mkdir (2),
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.BR mknodat (2),
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.BR mount (2),
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.BR mount (2),
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.BR socket (2),
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.BR socket (2),
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.BR stat (2),
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.BR stat (2),
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