/usr/include/tcl8.4/tcl-private/compat/unistd.h is in tcl8.4-dev 8.4.20-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* unistd.h --
*
* Macros, CONSTants and prototypes for Posix conformance.
*
* Copyright 1989 Regents of the University of California
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies. The University of California
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#ifndef _UNISTD
#define _UNISTD
#include <sys/types.h>
#ifndef _TCL
# include "tcl.h"
#endif
#ifndef NULL
#define NULL 0
#endif
/*
* Strict POSIX stuff goes here. Extensions go down below, in the
* ifndef _POSIX_SOURCE section.
*/
extern void _exit _ANSI_ARGS_((int status));
extern int access _ANSI_ARGS_((CONST char *path, int mode));
extern int chdir _ANSI_ARGS_((CONST char *path));
extern int chown _ANSI_ARGS_((CONST char *path, uid_t owner, gid_t group));
extern int close _ANSI_ARGS_((int fd));
extern int dup _ANSI_ARGS_((int oldfd));
extern int dup2 _ANSI_ARGS_((int oldfd, int newfd));
extern int execl _ANSI_ARGS_((CONST char *path, ...));
extern int execle _ANSI_ARGS_((CONST char *path, ...));
extern int execlp _ANSI_ARGS_((CONST char *file, ...));
extern int execv _ANSI_ARGS_((CONST char *path, char **argv));
extern int execve _ANSI_ARGS_((CONST char *path, char **argv, char **envp));
extern int execvp _ANSI_ARGS_((CONST char *file, char **argv));
extern pid_t fork _ANSI_ARGS_((void));
extern char *getcwd _ANSI_ARGS_((char *buf, size_t size));
extern gid_t getegid _ANSI_ARGS_((void));
extern uid_t geteuid _ANSI_ARGS_((void));
extern gid_t getgid _ANSI_ARGS_((void));
extern int getgroups _ANSI_ARGS_((int bufSize, int *buffer));
extern pid_t getpid _ANSI_ARGS_((void));
extern uid_t getuid _ANSI_ARGS_((void));
extern int isatty _ANSI_ARGS_((int fd));
extern long lseek _ANSI_ARGS_((int fd, long offset, int whence));
extern int pipe _ANSI_ARGS_((int *fildes));
extern int read _ANSI_ARGS_((int fd, char *buf, size_t size));
extern int setgid _ANSI_ARGS_((gid_t group));
extern int setuid _ANSI_ARGS_((uid_t user));
extern unsigned sleep _ANSI_ARGS_ ((unsigned seconds));
extern char *ttyname _ANSI_ARGS_((int fd));
extern int unlink _ANSI_ARGS_((CONST char *path));
extern int write _ANSI_ARGS_((int fd, CONST char *buf, size_t size));
#ifndef _POSIX_SOURCE
extern char *crypt _ANSI_ARGS_((CONST char *, CONST char *));
extern int fchown _ANSI_ARGS_((int fd, uid_t owner, gid_t group));
extern int flock _ANSI_ARGS_((int fd, int operation));
extern int ftruncate _ANSI_ARGS_((int fd, unsigned long length));
extern int ioctl _ANSI_ARGS_((int fd, int request, ...));
extern int readlink _ANSI_ARGS_((CONST char *path, char *buf, int bufsize));
extern int setegid _ANSI_ARGS_((gid_t group));
extern int seteuid _ANSI_ARGS_((uid_t user));
extern int setreuid _ANSI_ARGS_((int ruid, int euid));
extern int symlink _ANSI_ARGS_((CONST char *, CONST char *));
extern int ttyslot _ANSI_ARGS_((void));
extern int truncate _ANSI_ARGS_((CONST char *path, unsigned long length));
extern int vfork _ANSI_ARGS_((void));
#endif /* _POSIX_SOURCE */
#endif /* _UNISTD */
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