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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  Cover of The Linux Programming Interface
#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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