/usr/include/c-client/os_isc.h is in libc-client2007e-dev 8:2007f~dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Operating-system dependent routines -- ISC version
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 10 April 1992
* Last Edited: 15 September 2006
*/
#include <string.h>
#include <sys/types.h>
#include <sys/bsdtypes.h>
#include <stdlib.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <syslog.h>
#include <sys/file.h>
#include <ustat.h>
/* Different names, equivalent things in BSD and SysV */
/* L_SET is defined for some strange reason in <sys/file.h> on SVR4. */
#ifndef L_SET
#define L_SET SEEK_SET
#endif
#define L_INCR SEEK_CUR
#define L_XTND SEEK_END
#define direct dirent
#define ftruncate chsize
#define random lrand48
long gethostid (void);
void *memmove (void *s,void *ct,size_t n);
typedef int (*select_t) (struct direct *name);
typedef int (*compar_t) (void *d1,void *d2);
int scandir (char *dirname,struct direct ***namelist,select_t select,
compar_t compar);
int alphasort (void *d1,void *d2);
#include "env_unix.h"
#include "fs.h"
#include "ftl.h"
#include "nl.h"
#include "tcp.h"
#include "flocksim.h"
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