MKNOD(2-SVR4) RISC/os Reference Manual MKNOD(2-SVR4)
NAME
mknod - make a directory, or a special or ordinary file
SYNOPSIS
#include <sys/types.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 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
The file access permissions are specified in mode by the
0007777 bits, and may be constructed by an OR of the follow-
ing 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_IRWXU 00700 Read, write, execute by owner.
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 effec-
tive 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 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.
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MKNOD(2-SVR4) RISC/os Reference Manual MKNOD(2-SVR4)
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)]. If mode indicates a block or character special
file, dev is a configuration-dependent specification of a
character or block I/O device. If mode does not indicate a
block special or character special device, dev is ignored.
See mkdev(3C).
mknod may be invoked only by a privileged user for file
types other than FIFO special.
If path is a symbolic link, it is not followed.
mknod fails and creates no new file if one or more of the
following are true:
EEXIST The named file exists.
EINVAL dev is invalid.
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 and the file
system type does not allow it.
ENAMETOOLONG The length of the path argument exceeds
{PATH_MAX}, or the length of a path com-
ponent 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.
EPERM The effective user ID of the process is
not superuser.
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
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MKNOD(2-SVR4) RISC/os Reference Manual MKNOD(2-SVR4)
system call.
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), fs(4),
stat(5).
mkdir(1) in the User's Reference Manual.
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.
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