This is pipes/fifo_seqnum.h (Listing 44-6, page 911), an example from the book, The Linux Programming Interface.

The source code file is copyright 2022, Michael Kerrisk, and is licensed under the GNU General Public License, version 3.

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/* fifo_seqnum.h

   Header file used by fifo_seqnum_server.c and fifo_seqnum_client.c

   These programs create FIFOS in /tmp. This makes it easy to compile and
   run the programs. However, for a security reasons, a real-world
   application should never create sensitive files in /tmp. (As a simple of
   example of the kind of security problems that can result, a malicious
   user could create a FIFO using the name defined in SERVER_FIFO, and
   thereby cause a denial of service attack against this application.
   See Section 38.7 of "The Linux Programming Interface" for more details
   on this subject.)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "tlpi_hdr.h"

#define SERVER_FIFO "/tmp/seqnum_sv"
                                /* Well-known name for server's FIFO */
#define CLIENT_FIFO_TEMPLATE "/tmp/seqnum_cl.%ld"
                                /* Template for building client FIFO name */
                                /* Space required for client FIFO pathname
                                  (+20 as a generous allowance for the PID) */

struct request {                /* Request (client --> server) */
    pid_t pid;                  /* PID of client */
    int seqLen;                 /* Length of desired sequence */

struct response {               /* Response (server --> client) */
    int seqNum;                 /* Start of sequence */


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