mkdir(2)

1MKDIR(2)                   Linux Programmer's Manual                  MKDIR(2)
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NAME

6       mkdir - create a directory
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SYNOPSIS

9       #include <sys/stat.h>
10       #include <sys/types.h>
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12       int mkdir(const char *pathname, mode_t mode);
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DESCRIPTION

15       mkdir() attempts to create a directory named pathname.
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17       The  argument mode specifies the permissions to use.  It is modified by
18       the process's umask in the usual way: the permissions  of  the  created
19       directory  are  (mode & ~umask & 0777).  Other mode bits of the created
20       directory depend on the operating system.  For Linux, see below.
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22       The newly created directory will be owned by the effective user  ID  of
23       the process.  If the directory containing the file has the set-group-ID
24       bit set, or if the file system is  mounted  with  BSD  group  semantics
25       (mount -o bsdgroups or, synonymously mount -o grpid), the new directory
26       will inherit the group ownership from its parent; otherwise it will  be
27       owned by the effective group ID of the process.
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29       If  the  parent directory has the set-group-ID bit set then so will the
30       newly created directory.
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RETURN VALUE

33       mkdir() returns zero on success, or -1 if an error occurred  (in  which
34       case, errno is set appropriately).
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ERRORS

37       EACCES The  parent  directory  does  not  allow write permission to the
38              process, or one of the directories in  pathname  did  not  allow
39              search permission.  (See also path_resolution(7).)
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41       EDQUOT The user's quota of disk blocks or inodes on the file system has
42              been exhausted.
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44       EEXIST pathname already exists (not necessarily as a directory).   This
45              includes the case where pathname is a symbolic link, dangling or
46              not.
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48       EFAULT pathname points outside your accessible address space.
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50       ELOOP  Too many symbolic links were encountered in resolving pathname.
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52       EMLINK The number  of  links  to  the  parent  directory  would  exceed
53              LINK_MAX.
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55       ENAMETOOLONG
56              pathname was too long.
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58       ENOENT A  directory  component  in pathname does not exist or is a dan‐
59              gling symbolic link.
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61       ENOMEM Insufficient kernel memory was available.
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63       ENOSPC The device containing pathname has no room for  the  new  direc‐
64              tory.
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66       ENOSPC The  new  directory  cannot  be  created because the user's disk
67              quota is exhausted.
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69       ENOTDIR
70              A component used as a directory in pathname is not, in  fact,  a
71              directory.
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73       EPERM  The  file  system  containing pathname does not support the cre‐
74              ation of directories.
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76       EROFS  pathname refers to a file on a read-only file system.
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CONFORMING TO

79       SVr4, BSD, POSIX.1-2001.
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NOTES

82       Under Linux apart from the permission bits, only the S_ISVTX  mode  bit
83       is  honored.   That is, under Linux the created directory actually gets
84       mode (mode & ~umask & 01777).  See also stat(2).
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86       There are many infelicities in the protocol underlying  NFS.   Some  of
87       these affect mkdir().
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COLOPHON

94       This page is part of release 3.53 of the Linux  man-pages  project.   A
95       description  of  the project, and information about reporting bugs, can
96       be found at http://www.kernel.org/doc/man-pages/.
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100Linux                             2013-01-27                          MKDIR(2)