This is svsem/binary_sems.h (Listing 47-9, page 989), an example from the book, The Linux Programming Interface.

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

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/* binary_sems.h

   Header file for binary_sems.c.
#ifndef BINARY_SEMS_H           /* Prevent accidental double inclusion */

#include "tlpi_hdr.h"

/* Variables controlling operation of functions below */

extern Boolean bsUseSemUndo;            /* Use SEM_UNDO during semop()? */
extern Boolean bsRetryOnEintr;          /* Retry if semop() interrupted by
                                           signal handler? */

int initSemAvailable(int semId, int semNum);

int initSemInUse(int semId, int semNum);

int reserveSem(int semId, int semNum);

int releaseSem(int semId, int semNum);



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