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)

mknod(2)							System Calls Manual							  mknod(2)

NAME

       mknod - Creates an FIFO or special file

LIBRARY

       Standard C Library (libc.a)

SYNOPSIS

       #include <sys/stat.h>

       int mknod (	const char *path,      int mode,      dev_t device );

STANDARDS

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

       mknod():  POSIX.1, XPG4-UNIX

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

       Standards: standards(5)

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 file type, attributes, and access permissions. This  parameter  is  constructed  by  logically  ORing  values
       described  in the sys/mode.h header file.  Depends upon the configuration and is used only if the mode parameter specifies a block or char-
       acter special file.  If the file you specify is a remote file, the value of the device parameter must be meaningful on the node	where  the
       file resides.

DESCRIPTION

       The  mknod()  function  creates	a  special file or FIFO.  Using the mknod() function to create file types other than FIFO special requires
       superuser privilege.

       For the mknod() function to complete successfully, a process must have search permission and write permission in the  parent  directory	of
       the path parameter.

       The  new  file has the following characteristics: File type as specified by the mode parameter.	Owner ID set to the process effective user
       ID.  Group ID set to the group ID of its parent directory.  Permission and attribute bits set according to the value of the mode parameter.
       All bits set in the process file mode creation mask are cleared.  See the umask() function.

RETURN VALUES

       Upon  successful completion of the mknod() function 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 mknod() 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.  While accessing the file system, an I/O error occurred.  An invalid argument has been specified.  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 FIFO and the calling process does not have the sufficient privilege.  The directory in which the file is to be created is located on a
       read-only file system.

RELATED INFORMATION

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

       Commands: chmod(1), mkdir(1)

       Standards: standards(5) delim off

																	  mknod(2)