mkfifo(3) [osf1 man page]

mkfifo(3)						     Library Functions Manual							 mkfifo(3)

NAME

       mkfifo - Creates a FIFO

LIBRARY

       Standard C Library (libc.a)
       System V Compatibility Library (libsys5.a)

SYNOPSIS

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

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

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       mkfifo():  POSIX.1, XPG4, XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Names the new file.  If the final component of the path parameter names a symbolic link, the link will be traversed and pathname resolution
       will continue.  Specifies the type, attributes, and access permissions of the file.  This parameter is constructed by logically ORing  val-
       ues described in the sys/mode.h header file.

	      The mode is then modified by the current file mode creation mask (umask) value.

DESCRIPTION

       The mkfifo function used with libc.a is an interface to the mknod function, where the file that is to be created is a FIFO special file.

       When used with libsys5.a, the mkfifo() function creates a uni-directional STREAMS based file descriptor.

       No special system privileges are required under either implementation.

       Upon  successful  completion,  the mkfifo() function marks the st_atime, st_ctime, and st_mtime fields of the file for update, and sets the
       st_ctime and st_mtime fields of the directory that contains the new entry for update.

RETURN VALUES

       Upon successful completion of mkfifo(), a value of 0 (zero) is returned.  Otherwise, a value of -1 is returned and errno is set to indicate
       the error.

ERRORS

       If  the	mkfifo()  function fails, the new file is not created and errno may be set to one of the following values: A component of the path
       prefix denies search permission, or write permission is denied on the parent directory of the FIFO to be created.  The directory  in  which
       the  entry  for	the  new  link	is being placed cannot be extended because the user's quota of disk blocks or inodes on the file system is
       exhausted.  The named file exists.  Too many links were encountered in translating path.  No more file descriptors are available  for  this
       process.   The  system file table is full, or the device containing the pipes has no free inodes.  The length of the path parameter exceeds
       PATH_MAX or a pathname component is longer than NAME_MAX.  A component of the path prefix does not exist or the path parameter points to an
       empty  string.  The directory that would contain the new file cannot be extended or the file system is out of file allocation resources.  A
       component of the path prefix is not a directory.  The mode parameter specifies a file type other than S_IFIFO and the calling process  does
       not have the DEV_CONFIG system privilege.  The directory in which the file is to be created is located on a read-only file system.

RELATED INFORMATION

       Commands: chmod(1), mkdir(1), mkfifo(1)

       Functions: chmod(2), mkdir(2), mknod(2), open(2), stat(2), umask(2)

       Standards: standards(5)

       delim off

																	 mkfifo(3)

MKFIFO(2)						      BSD System Calls Manual							 MKFIFO(2)

NAME

     mkfifo, mkfifoat -- make a fifo file

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

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

     int
     mkfifoat(int fd, const char *path, mode_t mode);

DESCRIPTION

     The mkfifo() system call creates a new fifo file with name path.  The access permissions are specified by mode and restricted by the umask(2)
     of the calling process.

     The fifo's owner ID is set to the process's effective user ID.  The fifo's group ID is set to that of the parent directory in which it is
     created.

     The mkfifoat() system call is equivalent to mkfifo() except in the case where path specifies a relative path.  In this case the newly created
     FIFO is created relative to the directory associated with the file descriptor fd instead of the current working directory.  If mkfifoat() is
     passed the special value AT_FDCWD in the fd parameter, the current working directory is used and the behavior is identical to a call to
     mkfifo().

RETURN VALUES

     The mkfifo() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     The mkfifo() system call will fail and no fifo will be created if:

     [ENOTSUP]		The kernel has not been configured to support fifo's.

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

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.

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

     [EACCES]		A component of the path prefix denies search permission, or write permission is denied on the parent directory of the fifo
			to be created.

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

     [EROFS]		The named file would reside on a read-only file system.

     [EEXIST]		The named file exists.

     [EPERM]		The parent directory of the named file has its immutable flag set, see the chflags(2) manual page for more information.

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

     In addition to the errors returned by the mkfifo(), the mkfifoat() may fail if:

     [EBADF]		The path argument does not specify an absolute path and the fd argument is neither AT_FDCWD nor a valid file descriptor
			open for searching.

     [ENOTDIR]		The path argument is not an absolute path and fd is neither AT_FDCWD nor a file descriptor associated with a directory.

SEE ALSO

     chflags(2), chmod(2), mknod(2), stat(2), umask(2)

STANDARDS

     The mkfifo() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1'').  The mkfifoat() system call follows The Open Group
     Extended API Set 2 specification.

HISTORY

     The mkfifoat() system call appeared in FreeBSD 8.0.

BSD
								  April 10, 2008							       BSD