This is sockets/ud_ucase.h (Listing 57-5, page 1171), 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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/* ud_ucase.h

   Header file for ud_ucase_sv.c and ud_ucase_cl.c.

   These programs employ sockets 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 file using the name defined in SV_SOCK_PATH, 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/un.h>
#include <sys/socket.h>
#include <ctype.h>
#include "tlpi_hdr.h"

#define BUF_SIZE 10             /* Maximum size of messages exchanged
                                   between client and server */

#define SV_SOCK_PATH "/tmp/ud_ucase"


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