MKNOD(2) | System Calls Manual | MKNOD(2) |
mknod
, mknodat
—
#include <sys/stat.h>
int
mknod
(const
char *path, mode_t
mode, dev_t
dev);
#include
<sys/stat.h>
#include <fcntl.h>
int
mknodat
(int
fd, const char
*path, mode_t mode,
dev_t dev);
mknod
with S_IFIFO
specified in
mode and 0 in dev makes a FIFO
file. This call is respectively a portable alias for
mkfifo(2) and
mkfifoat(2).
mknod
with S_IFCHR
or S_IFBLK
in mode makes a
device special file. The file path is created with the
major and minor device numbers specified by dev. The
access permissions of path are extracted from
mode, modified by the
umask(2) of the parent
process.
mknodat
() works the same way as
mknod
() except if path is
relative. In that case, it is looked up from a directory whose file
descriptor was passed as fd. Search permission is
required on this directory. fd can be set to
AT_FDCWD
in order to specify the current
directory.
mknod
() requires super-user privileges for
creating device special files.
mknod
() and mknodat
()
functions return the value 0 if successful; otherwise the
value -1 is returned and the global variable
errno is set to indicate the error.
mknod
() and mknodat
() will fail
and the file will be not created if:
EACCES
]EDQUOT
]EEXIST
]EFAULT
]EINVAL
]EIO
]ELOOP
]ENAMETOOLONG
]NAME_MAX
}
characters, or an entire path name exceeded
{PATH_MAX
} characters.ENOENT
]ENOSPC
]ENOTDIR
]EOPNOTSUPP
]EPERM
]EROFS
]In addition, mknodat
() will fail if:
mknod
() function conforms to IEEE
Std 1003.1-1990 (“POSIX.1”).
mknodat
() conforms to IEEE Std
1003.1-2008 (“POSIX.1”).
mknod
() function call appeared in
Version 6 AT&T UNIX.
The alias mode for mkfifo(2) and mkfifoat(2) first appeared in NetBSD 9.
June 20, 2019 | NetBSD 9.2 |