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mkdir.2: Merge text of mkdirat(2)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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man2/mkdir.2
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man2/mkdir.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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.\" Public License. It comes with NO WARRANTY.
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.\" Public License. It comes with NO WARRANTY.
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.\" %%%LICENSE_END
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.\" %%%LICENSE_END
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.\"
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.\"
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.TH MKDIR 2 2013-01-27 "Linux" "Linux Programmer's Manual"
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.TH MKDIR 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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mkdir \- create a directory
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mkdir, mkdirat \- create a directory
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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/stat.h>
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.B #include <sys/stat.h>
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@ -17,6 +18,31 @@ mkdir \- create a directory
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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 mkdir(const char *" pathname ", mode_t " mode );
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.BI "int mkdir(const char *" pathname ", mode_t " mode );
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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 mkdirat(int " dirfd ", const char *" pathname ", mode_t " mode );
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR mkdirat ():
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.PD 0
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.ad l
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.RS 4
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.TP 4
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Since glibc 2.10:
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_XOPEN_SOURCE\ >=\ 700 || _POSIX_C_SOURCE\ >=\ 200809L
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.TP
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Before glibc 2.10:
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_ATFILE_SOURCE
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.RE
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.ad
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.PD
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.fi
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.fi
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.SH DESCRIPTION
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.SH DESCRIPTION
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.BR mkdir ()
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.BR mkdir ()
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@ -45,9 +71,52 @@ otherwise it will be owned by the effective group ID of the process.
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If the parent directory has the set-group-ID bit set, then so will the
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If the parent directory has the set-group-ID bit set, then so will the
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newly created directory.
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newly created directory.
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.\"
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.\"
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.SS mkdirat()
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The
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.BR mkdirat ()
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system call operates in exactly the same way as
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.BR mkdir (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 mkdir (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 mkdir (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 mkdirat ().
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.SH RETURN VALUE
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.SH RETURN VALUE
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.BR mkdir ()
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.BR mkdir ()
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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 mkdirat ()
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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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@ -115,9 +184,30 @@ does not support the creation of directories.
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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 mkdirat ():
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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 mkdirat ()
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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 mkdir ():
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SVr4, BSD, POSIX.1-2001.
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SVr4, BSD, POSIX.1-2001.
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.\" SVr4 documents additional EIO, EMULTIHOP
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.\" SVr4 documents additional EIO, EMULTIHOP
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.BR mkdirat ():
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POSIX.1-2008.
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.SH NOTES
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.SH NOTES
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Under Linux apart from the permission bits, only the
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Under Linux apart from the permission bits, only the
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.B S_ISVTX
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.B S_ISVTX
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@ -134,7 +224,6 @@ Some of these affect
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.BR mkdir (1),
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.BR mkdir (1),
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.BR chmod (2),
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.BR chmod (2),
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.BR chown (2),
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.BR chown (2),
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.BR mkdirat (2),
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.BR mknod (2),
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.BR mknod (2),
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.BR mount (2),
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.BR mount (2),
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.BR rmdir (2),
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.BR rmdir (2),
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