This is filelock/create_pid_file.h, an example to accompany the book, The Linux Programming Interface.

This file is not printed in the book; it is the header file for create_pid_file.c (Listing 55-4, page 1143).

The source code file is copyright 2010, Michael Kerrisk, and is licensed under the GNU Lesser General Public License, version 3.

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.

  Cover of The Linux Programming Interface
/* create_pid_file.h

   Header file for create_pid_file.c.
#ifndef CREATE_PID_FILE_H   /* Prevent accidental double inclusion */

#define CPF_CLOEXEC 1

int createPidFile(const char *progName, const char *pidFile, int flags);


Note that, in most cases, the programs rendered in these web pages are not free standing: you'll typically also need a few other source files (mostly in the lib/ subdirectory) as well. Generally, it's easier to just download the entire source tarball and build the programs with make(1). By hovering your mouse over the various hyperlinked include files and function calls above, you can see which other source files this file depends on.