MKFIFO(2) BSD Programmer's Manual MKFIFO(2)
mkfifo - make a fifo file
mkfifo(const char *path, mode_t mode);
Mkfifo() creates a new fifo file with name path. The access permissions
are specified by mode and restricted by the umask(2) of the calling pro-
The fifo's owner ID is set to the process's effective user ID. The fi-
fo's group ID is set to that of the parent directory in which it is cre-
A 0 return value indicates success. A -1 return value indicates an er-
ror, and an error code is stored in errno.
Mkfifo() will fail and no fifo will be created if:
[ENOTSUPP] The kernel has not been configured to support fifo's.
[ENOTDIR] A component of the path prefix is not a directory.
[EINVAL] The pathname contains a character with the high-order bit
A component of a pathname exceeded 255 characters, or an en-
tire path name exceeded 1023 characters.
[ENOENT] A component of the path prefix does not exist.
[EACCES] Search permission is denied for a component of the path pre-
[ELOOP] Too many symbolic links were encountered in translating the
[EPERM] The path argument contains a byte with the high-order bit
[EROFS] The named file resides on a read-only file system.
[EEXIST] The named file exists.
[ENOSPC] The directory in which the entry for the new fifo is being
placed cannot be extended because there is no space left on
the file system containing the directory.
[ENOSPC] There are no free inodes on the file system on which the fifo
is being created.
[EDQUOT] The directory in which the entry for the new fifo is being
placed cannot be extended because the user's quota of disk
blocks on the file system containing the directory has been
[EDQUOT] The user's quota of inodes on the file system on which the
fifo is being created has been exhausted.
[EIO] An I/O error occurred while making the directory entry or al-
locating the inode.
[EIO] An I/O error occurred while reading from or writing to the
[EFAULT] Path points outside the process's allocated address space.
chmod(2), stat(2), umask(2)
The mkfifo function call conforms to IEEE Std1003.1-1988 (``POSIX'').
4.4BSD June 4, 1993 2