This is lib/tlpi_hdr.h (Listing 3-1, page 51), an example from the book, The Linux Programming Interface.

The source code file is copyright 2024, Michael Kerrisk, and is licensed under the GNU Lesser General Public License, version 3.

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In the listing below, the names of Linux system calls and C library functions are hyperlinked to manual pages from the Linux man-pages project, and the names of functions implemented in the book are hyperlinked to the implementations of those functions.


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  Cover of The Linux Programming Interface
/* tlpi_hdr.h

   Standard header file used by nearly all of our example programs.
#ifndef TLPI_HDR_H
#define TLPI_HDR_H      /* Prevent accidental double inclusion */

#include <sys/types.h>  /* Type definitions used by many programs */
#include <stdio.h>      /* Standard I/O functions */
#include <stdlib.h>     /* Prototypes of commonly used library functions,
                           plus EXIT_SUCCESS and EXIT_FAILURE constants */
#include <unistd.h>     /* Prototypes for many system calls */
#include <errno.h>      /* Declares errno and defines error constants */
#include <string.h>     /* Commonly used string-handling functions */
#include <stdbool.h>    /* 'bool' type plus 'true' and 'false' constants */

#include "get_num.h"    /* Declares our functions for handling numeric
                           arguments (getInt(), getLong()) */

#include "error_functions.h"  /* Declares our error-handling functions */

/* Unfortunately some UNIX implementations define FALSE and TRUE -
   here we'll undefine them */

#ifdef TRUE
#undef TRUE

#ifdef FALSE
#undef FALSE

typedef enum { FALSE, TRUE } Boolean;

#define min(m,n) ((m) < (n) ? (m) : (n))
#define max(m,n) ((m) > (n) ? (m) : (n))

/* Some systems don't define 'socklen_t' */

#if defined(__sgi)
typedef int socklen_t;

#if defined(__sun)
#include <sys/file.h>           /* Has definition of FASYNC */

#if ! defined(O_ASYNC) && defined(FASYNC)
/* Some systems define FASYNC instead of O_ASYNC */

#if defined(MAP_ANON) && ! defined(MAP_ANONYMOUS)
/* BSD derivatives usually have MAP_ANON, not MAP_ANONYMOUS */


#if ! defined(O_SYNC) && defined(O_FSYNC)
/* Some implementations have O_FSYNC instead of O_SYNC */
#define O_SYNC O_FSYNC

#if defined(__FreeBSD__)

/* FreeBSD uses these alternate names for fields in the sigval structure */

#define sival_int sigval_int
#define sival_ptr sigval_ptr



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