MKDIRSection: Linux Programmer's Manual (2)
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NAMEmkdir - create a directory
#include <sys/stat.h> #include <sys/types.h> int mkdir(const char *pathname, mode_t mode);
DESCRIPTIONmkdir() attempts to create a directory named pathname.
The argument mode specifies the permissions to use. It is modified by the process's umask in the usual way: the permissions of the created directory are (mode & ~umask & 0777). Other mode bits of the created directory depend on the operating system. For Linux, see below.
The newly created directory will be owned by the effective user ID of the process. If the directory containing the file has the set-group-ID bit set, or if the file system is mounted with BSD group semantics (mount -o bsdgroups or, synonymously mount -o grpid), the new directory will inherit the group ownership from its parent; otherwise it will be owned by the effective group ID of the process.
RETURN VALUEmkdir() returns zero on success, or -1 if an error occurred (in which case, errno is set appropriately).
- The parent directory does not allow write permission to the process, or one of the directories in pathname did not allow search permission. (See also path_resolution(7).)
- pathname already exists (not necessarily as a directory). This includes the case where pathname is a symbolic link, dangling or not.
- pathname points outside your accessible address space.
- Too many symbolic links were encountered in resolving pathname.
- pathname was too long.
- A directory component in pathname does not exist or is a dangling symbolic link.
- Insufficient kernel memory was available.
- The device containing pathname has no room for the new directory.
- The new directory cannot be created because the user's disk quota is exhausted.
- A component used as a directory in pathname is not, in fact, a directory.
- The file system containing pathname does not support the creation of directories.
- pathname refers to a file on a read-only file system.
CONFORMING TOSVr4, BSD, POSIX.1-2001.
NOTESUnder Linux apart from the permission bits, only the S_ISVTX mode bit is honored. That is, under Linux the created directory actually gets mode (mode & ~umask & 01777). See also stat(2).
SEE ALSOmkdir(1), chmod(2), chown(2), mkdirat(2), mknod(2), mount(2), rmdir(2), stat(2), umask(2), unlink(2), path_resolution(7)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.