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MKDIR(3P)                  POSIX Programmer's Manual                 MKDIR(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       mkdir - make a directory
SYNOPSIS
       #include <sys/stat.h>
       int mkdir(const char *path, mode_t mode);

DESCRIPTION
       The mkdir() function shall create a new directory with name  path.  The
       file  permission  bits  of  the new directory shall be initialized from
       mode. These file permission bits of the mode argument shall be modified
       by the process' file creation mask.
       When  bits  in  mode  other  than the file permission bits are set, the
       meaning of these additional bits is implementation-defined.
       The directory's user ID shall be set to the process' effective user ID.
       The  directory's  group  ID  shall be set to the group ID of the parent
       directory or to the effective group ID of the process.  Implementations
       shall provide a way to initialize the directory's group ID to the group
       ID of the parent directory. Implementations may, but need not,  provide
       an implementation-defined way to initialize the directory's group ID to
       the effective group ID of the calling process.
       The newly created directory shall be an empty directory.
       If path names a symbolic link, mkdir() shall  fail  and  set  errno  to
       [EEXIST].
       Upon successful completion, mkdir() shall mark for update the st_atime,
       st_ctime, and st_mtime fields of the directory. Also, the st_ctime  and
       st_mtime  fields  of the directory that contains the new entry shall be
       marked for update.
RETURN VALUE
       Upon successful completion, mkdir() shall return 0. Otherwise, -1 shall
       be  returned,  no directory shall be created, and errno shall be set to
       indicate the error.
ERRORS
       The mkdir() function shall fail if:
       EACCES Search permission is denied on a component of the  path  prefix,
              or  write  permission  is  denied on the parent directory of the
              directory to be created.
       EEXIST The named file exists.
       ELOOP  A loop exists in symbolic links encountered during resolution of
              the path argument.
       EMLINK The link count of the parent directory would exceed {LINK_MAX}.
       ENAMETOOLONG
              The length of the path argument exceeds {PATH_MAX} or a pathname
              component is longer than {NAME_MAX}.
       ENOENT A component of the path prefix specified by path does  not  name
              an existing directory or path is an empty string.
       ENOSPC The  file  system does not contain enough space to hold the con-
              tents of the new directory or to extend the parent directory  of
              the new directory.
       ENOTDIR
              A component of the path prefix is not a directory.
       EROFS  The parent directory resides on a read-only file system.

       The mkdir() function may fail if:
       ELOOP  More  than  {SYMLOOP_MAX} symbolic links were encountered during
              resolution of the path argument.
       ENAMETOOLONG
              As a result of encountering a symbolic link in resolution of the
              path  argument,  the  length  of the substituted pathname string
              exceeded {PATH_MAX}.

       The following sections are informative.
EXAMPLES
   Creating a Directory
       The  following  example  shows  how  to  create   a   directory   named
       /home/cnd/mod1, with read/write/search permissions for owner and group,
       and with read/search permissions for others.

              #include <sys/types.h>
              #include <sys/stat.h>

              int status;
              ...
              status = mkdir("/home/cnd/mod1", S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
APPLICATION USAGE
       None.
RATIONALE
       The mkdir() function originated in 4.2 BSD and was added to System V in
       Release 3.0.
       4.3 BSD detects [ENAMETOOLONG].
       The POSIX.1-1990 standard required that the group ID of a newly created
       directory be set to the group ID of its  parent  directory  or  to  the
       effective  group  ID  of the creating process. FIPS 151-2 required that
       implementations provide a way to have the group ID be set to the  group
       ID  of  the  containing directory, but did not prohibit implementations
       also supporting a way to set the group ID to the effective group ID  of
       the  creating  process. Conforming applications should not assume which
       group ID will be used. If it matters, an application can use chown() to
       set  the  group  ID  after the directory is created, or determine under
       what conditions the implementation will set the desired group ID.
FUTURE DIRECTIONS
       None.
SEE ALSO
       umask(),  the  Base   Definitions   volume   of   IEEE Std 1003.1-2001,
       <sys/stat.h>, <sys/types.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                            MKDIR(3P)