MKFIFO(2)                 OpenBSD Programmer's Manual                MKFIFO(2)

NAME
     mkfifo - make a FIFO file

SYNOPSIS
     #include <sys/types.h>
     #include <sys/stat.h>

     int
     mkfifo(const char *path, mode_t mode);

DESCRIPTION
     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-
     cess.

     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-
     ated.

RETURN VALUES
     A 0 return value indicates success.  A -1 return value indicates an er-
     ror, and an error code is stored in errno.

ERRORS
     mkfifo() will fail and no FIFO will be created if:

     [EOPNOTSUPP]  The kernel has not been configured to support FIFOs.

     [ENOTDIR]     A component of the path prefix is not a directory.

     [ENAMETOOLONG]
                   A component of a pathname exceeded {NAME_MAX} characters,
                   or an entire path name exceeded {PATH_MAX} characters.

     [ENOENT]      A component of the path prefix does not exist.

     [EACCES]      Search permission is denied for a component of the path
                   prefix.

     [ELOOP]       Too many symbolic links were encountered in translating the
                   pathname.

     [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
                   exhausted.

     [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
                   allocating the inode.

     [EIO]         An I/O error occurred while reading from or writing to the
                   file system.

     [EFAULT]      path points outside the process's allocated address space.

SEE ALSO
     chmod(2), stat(2), umask(2)

STANDARDS
     The mkfifo function call conforms to IEEE Std 1003.1-1988 (``POSIX'').

OpenBSD 4.1                      June 4, 1993                                2
