mkfifo man page on Oracle

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MKFIFO(3)		   Linux Programmer's Manual		     MKFIFO(3)

       mkfifo - make a FIFO special file (a named pipe)

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

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

       mkfifo()	 makes a FIFO special file with name pathname.	mode specifies
       the FIFO's permissions.	It is modified by the process's umask  in  the
       usual way: the permissions of the created file are (mode & ~umask).

       A  FIFO special file is similar to a pipe, except that it is created in
       a different way.	 Instead of being an anonymous communications channel,
       a  FIFO	special	 file  is  entered  into  the  file  system by calling

       Once you have created a FIFO special file in this way, any process  can
       open  it	 for  reading or writing, in the same way as an ordinary file.
       However, it has to be open at both ends simultaneously before  you  can
       proceed to do any input or output operations on it.  Opening a FIFO for
       reading normally blocks until some other process opens  the  same  FIFO
       for  writing,  and vice versa.  See fifo(7) for nonblocking handling of
       FIFO special files.

       On success mkfifo() returns 0.  In the case of an error, -1 is returned
       (in which case, errno is set appropriately).

       EACCES One  of  the  directories in pathname did not allow search (exe‐
	      cute) permission.

       EDQUOT The user's quota of disk blocks or inodes on the file system has
	      been exhausted.

       EEXIST pathname	already exists.	 This includes the case where pathname
	      is a symbolic link, dangling or not.

	      Either the total length of pathname is greater than PATH_MAX, or
	      an  individual  filename	component  has	a  length greater than
	      NAME_MAX.	 In the GNU system, there is no imposed limit on over‐
	      all  filename  length, but some file systems may place limits on
	      the length of a component.

       ENOENT A directory component in pathname does not exist or  is  a  dan‐
	      gling symbolic link.

       ENOSPC The directory or file system has no room for the new file.

	      A	 component  used as a directory in pathname is not, in fact, a

       EROFS  pathname refers to a read-only file system.


       mkfifo(1), close(2), open(2),  read(2),	stat(2),  umask(2),  write(2),
       mkfifoat(3), fifo(7)

       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

GNU				  2013-01-27			     MKFIFO(3)

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