mknod(2) SYSTEM CALLS mknod(2)
NAME
mknod - make a directory, or a special or ordinary file
SYNOPSIS
#include <sys/types.h>
#include <osfcn.h>
#include <sys/stat.h>
int mknod (const char *path, modet mode, devt 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 SIFMT bits, which
must be set to one of the following values:
SIFIFO fifo special
SIFCHR character special
SIFDIR directory
SIFBLK block special
SIFREG ordinary file
SIFNAM name special file
The file access permissions are specified in mode by the
0007777 bits, and may be constructed by an OR of the follow-
ing values:
SISUID 04000 Set user ID on execution.
SISGID 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
SISVTX 01000 Save text image after execution.
SIRUSR 00400 Read by owner.
SIWUSR 00200 Write by owner.
SIXUSR 00100 Execute (search if a directory) by owner.
SIRWXG 00070 Read, write, execute by group.
SIRGRP 00040 Read by group.
SIWGRP 00020 Write by group.
SIXGRP 00010 Execute by group.
SIRWXO 00007 Read, write, execute (search) by others.
SIROTH 00004 Read by others.
SIWOTH 00002 Write by others
SIXOTH 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 effec-
tive group ID of the process. However, if the SISGID bit
is set in the parent directory, then the group ID of the
file is 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 SISGID bit is cleared.
Last change: XENIX Compatibility Package 1
mknod(2) SYSTEM CALLS mknod(2)
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. See mkdev(3C).
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
{PATHMAX}, or the length of a path com-
ponent exceeds {NAMEMAX} while
(_POSIXNOTRUNC) 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.
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.
Last change: XENIX Compatibility Package 2
mknod(2) SYSTEM CALLS mknod(2)
ENOLINK path points to a remote machine and the
link to that machine is no longer
active.
SEE ALSO
chmod(2), exec(2), umask(2), mkdev(3C), mkfifo(3C), stat(5).
fs(4) in the System Administrator's Reference Manual.
mkdir(1) in the User's Reference Manual.
creatsem(2), sdget(2) in the BSD/XENIX Compatibility Guide.
DIAGNOSTICS
Upon successful completion a value of 0 is returned. Other-
wise, a value of -1 is returned and errno is set to indicate
the error.
NOTES
If mknod creates a device in a remote directory using Remote
File Sharing, the major and minor device numbers are inter-
preted by the server.
Semaphore files should be created with the creatsem system
call. Shared data files should be created with the sdget
system call.
Last change: XENIX Compatibility Package 3