mirror of https://github.com/mkerrisk/man-pages
131 lines
3.2 KiB
Groff
131 lines
3.2 KiB
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
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.\" 1993 Michael Haardt
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.\" 1993,1994 Ian Jackson.
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.\" You may distribute it under the terms of the GNU General
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.\" Public Licence. It comes with NO WARRANTY.
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.\"
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.TH MKDIR 2 2003-12-09 "Linux 2.4" "Linux Programmer's Manual"
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.SH NAME
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mkdir \- create a directory
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.SH SYNOPSIS
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.nf
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.B #include <sys/stat.h>
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.B #include <sys/types.h>
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.\" .B #include <unistd.h>
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.sp
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.BI "int mkdir(const char *" pathname ", mode_t " mode );
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.fi
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.SH DESCRIPTION
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.BR mkdir ()
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attempts to create a directory named
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.IR pathname .
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The parameter
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.I mode
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specifies the permissions to use.
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It is modified by the process's
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.I umask
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in the usual way: the permissions of the created directory are
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.RI ( mode " & ~" umask " & 0777)."
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Other mode bits of the created directory depend on the operating system.
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For Linux, see below.
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The newly created directory will be owned by the effective user ID of the
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process.
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If the directory containing the file 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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new directory will inherit the group ownership from its parent;
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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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newly created directory.
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.SH "RETURN VALUE"
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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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.I errno
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is set appropriately).
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.SH ERRORS
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.TP
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.B EACCES
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The parent directory does not allow write permission to the process,
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or one of the directories in
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.IR pathname
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did not allow search permission.
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(See also
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.BR path_resolution (2).)
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.TP
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.B EEXIST
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.I pathname
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already exists (not necessarily as a directory).
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This includes the case where
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.I pathname
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is a symbolic link, dangling or not.
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.TP
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.B EFAULT
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.IR pathname " points outside your accessible address space."
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.TP
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.B ELOOP
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Too many symbolic links were encountered in resolving
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.IR pathname .
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.TP
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.B ENAMETOOLONG
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.IR pathname " was too long."
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.TP
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.B ENOENT
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A directory component in
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.I pathname
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does not exist or is a dangling symbolic link.
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.TP
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.B ENOMEM
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Insufficient kernel memory was available.
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.TP
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.B ENOSPC
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The device containing
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.I pathname
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has no room for the new directory.
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.TP
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.B ENOSPC
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The new directory cannot be created because the user's disk quota is
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exhausted.
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.TP
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.B ENOTDIR
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A component used as a directory in
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.I pathname
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is not, in fact, a directory.
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.TP
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.B EPERM
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The filesystem containing
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.IR pathname
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does not support the creation of directories.
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.TP
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.B EROFS
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.I pathname
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refers to a file on a read-only filesystem.
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.SH "CONFORMING TO"
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SVr4, BSD, POSIX.1-2001.
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.\" SVr4 documents additional EIO, EMULTIHOP
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.SH NOTES
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Under Linux apart from the permission bits, only the S_ISVTX mode bit
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is honored.
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That is, under Linux the created directory actually gets mode
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.RI ( mode " & ~" umask " & 01777)."
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See also
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.BR stat (2).
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.PP
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There are many infelicities in the protocol underlying NFS.
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Some of these affect
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.BR mkdir ().
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.SH "SEE ALSO"
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.BR mkdir (1),
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.BR chmod (2),
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.BR mkdirat (2),
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.BR mknod (2),
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.BR mount (2),
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.BR path_resolution (2),
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.BR rmdir (2),
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.BR stat (2),
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.BR umask (2),
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.BR unlink (2)
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