mkfifo(3C)						   Standard C Library Functions 						mkfifo(3C)

NAME

       mkfifo - make a FIFO special file

SYNOPSIS

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

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

DESCRIPTION

       The  mkfifo()  function creates a new FIFO special file named by the pathname pointed to by path.  The file permission bits of the new FIFO
       are initialized from mode.  The file permission bits of the mode argument are modified by the process's file creation mask (see	umask(2)).
       Bits other than the file permission bits in mode are ignored.

       If path names a symbolic link, mkfifo() fails and sets errno to EEXIST.

       The  FIFO's user ID is set to the process's effective user ID. The FIFO's group ID is set to the group ID of the parent directory or to the
       effective group ID of the process.

       The mkfifo() function calls mknod(2) to create the file.

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

RETURN VALUES

       Upon successful completion, 0 is returned.  Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The mkfifo() function will fail if:

       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.

       EEXIST	       The named file already exists.

       ELOOP	       A loop exists in symbolic links encountered during resolution of the path argument.

       ENAMETOOLONG    The length of the path argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

       ENOENT	       A component of the path prefix specified by path does not name an existing directory or path is an empty string.

       ENOSPC	       The directory that would contain the new file cannot be extended or the file system is out of file-allocation resources.

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

       EROFS	       The named file resides on a read-only file system.

       The mkfifo() function may fail if:

       ELOOP	       Too many symbolic links were encountered in resolving path.

       ENAMETOOLONG    The length of the path argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

EXAMPLES

       Example 1 Create a FIFO File

       The following example demonstrates how to create a FIFO file named /home/cnd/mod_done with read and write permissions  for  the	owner  and
       read permissions for the group and others.

	 #include sys/types.h>
	 #include sys/stat.h>
	 int status;
	 ...
	 status = mkfifo("/home/cnd/mod_done", S_IWUSR | S_IRUSR |
		 S_IRGRP | S_IROTH);

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mkdir(1), chmod(2), exec(2), mknod(2), umask(2), stat.h(3HEAD), ufs(7FS), attributes(5), standards(5)

SunOS 5.11							    24 Apr 2002 							mkfifo(3C)