mknod(2XNX) (XENIX System Compatibility) mknod(2XNX)
NAME
mknod - (XENIX) make a directory, or a special or ordinary
file
SYNOPSIS
#include <sys/types.h>
#include <sys/stat.h>
int mknod(const char *path, mode_t mode, dev_t dev);
DESCRIPTION
mknod creates a new file named by the path name pointed to by
path. The file type and permissions of the new file are
initialized from mode.
The file type is specified in mode by the S_IFMT bits, which
must be set to one of the following values:
S_IFIFO fifo special
S_IFCHR character special
S_IFDIR directory
S_IFBLK block special
S_IFREG ordinary file
S_IFNAM name special file
The file access permissions are specified in mode by the
0007777 bits, and may be constructed by an OR of the following
values:
S_ISUID 04000 Set user ID on execution.
S_ISGID 020#0 Set group ID on execution if # is 7, 5, 3, or 1
Enable mandatory file/record locking if # is 6, 4, 2, or 0
S_ISVTX 01000 Save text image after execution.
S_IRUSR 00400 Read by owner.
S_IWUSR 00200 Write by owner.
S_IXUSR 00100 Execute (search if a directory) by owner.
S_IRWXG 00070 Read, write, execute by group.
S_IRGRP 00040 Read by group.
S_IWGRP 00020 Write by group.
S_IXGRP 00010 Execute by group.
S_IRWXO 00007 Read, write, execute (search) by others.
S_IROTH 00004 Read by others.
S_IWOTH 00002 Write by others
S_IXOTH 00001 Execute by others.
The owner ID of the file is set to the effective user ID of
the process. The group ID of the file is set to the effective
group ID of the process. However, if the S_ISGID bit is set
in the parent directory, then the group ID of the file is
Copyright 1994 Novell, Inc. Page 1
mknod(2XNX) (XENIX System Compatibility) mknod(2XNX)
inherited from the parent. If the group ID of the new file
does not match the effective group ID or one of the
supplementary group IDs, the S_ISGID bit is cleared.
Values of mode other than those above are undefined and should
not be used. The access permission bits of mode are modified
by the process's file mode creation mask: all bits set in the
process's file mode creation mask are cleared [see umask(2)].
For block and character special files, dev is the special
file's device number. For name special files, dev is the file
type of the name file, either a XENIX shared data file or a
XENIX semaphore. Otherwise, dev is ignored.
mknod may be invoked only by the privileged user for file
types other than FIFO special.
mknod fails and creates no new file if one or more of the
following are true:
EEXIST The named file exists.
EINVAL Invalid arg value.
EFAULT path points outside the allocated address space of the
process.
ELOOP Too many symbolic links were encountered in translating
path.
EMULTIHOP
Components of path require hopping to multiple remote
machines.
ENAMETOOLONG
The length of the path argument exceeds {PATH_MAX}, or
the length of a path component exceeds {NAME_MAX} while
(_POSIX_NO_TRUNC) is in effect.
ENOTDIR
A component of the path prefix is not a directory.
ENOENT A component of the path prefix does not exist or is a
null pathname.
Copyright 1994 Novell, Inc. Page 2
mknod(2XNX) (XENIX System Compatibility) mknod(2XNX)
EPERM The effective user ID of the process is not super-user.
EROFS The directory in which the file is to be created is
located on a read-only file system.
ENOSPC No space is available.
EINTR A signal was caught during the mknod system call.
ENOLINK
path points to a remote machine and the link to that
machine is no longer active.
REFERENCES
creatsem(2XNX), chmod(2), exec(2), mkdir(1), mkfifo(3C),
sdget(2XNX), stat(5), umask(2)
Return Values
Upon successful completion a value of 0 is returned.
Otherwise, a value of -1 is returned and errno is set to
indicate the error.
NOTICES
Semaphore files should be created with the creatsem system
call. Shared data files should be created with the sdget
system call.
Copyright 1994 Novell, Inc. Page 3