/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * System dependent header files for research */ #include <u.h>#include <libc.h>#include <regexp.h>#include <bio.h>#include "String.h" /* *  for the lock routines in libsys.c */typedef struct Mlock	Mlock;struct Mlock {	int fd;	int pid;	String *name;}; /* *  from config.c */extern char *MAILROOT;	/* root of mail system */extern char *UPASLOG;	/* log directory */extern char *UPASLIB;	/* upas library directory */extern char *UPASBIN;	/* upas binary directory */extern char *UPASTMP;	/* temporary directory */extern char *SHELL;	/* path name of shell */extern char *POST;	/* path name of post server addresses */extern int MBOXMODE;	/* default mailbox protection mode */ /* *  files in libsys.c */extern char	*sysname_read(void);extern char	*alt_sysname_read(void);extern char	*domainname_read(void);extern char	**sysnames_read(void);extern char	*getlog(void);extern char	*thedate(void);extern Biobuf	*sysopen(char*, char*, ulong);extern int	sysopentty(void);extern int	sysclose(Biobuf*);extern int	sysmkdir(char*, ulong);extern int	syschgrp(char*, char*);extern Mlock	*syslock(char *);extern void	sysunlock(Mlock *);extern void	syslockrefresh(Mlock *);extern int	e_nonexistent(void);extern int	e_locked(void);extern long	sysfilelen(Biobuf*);extern int	sysremove(char*);extern int	sysrename(char*, char*);extern int	sysexist(char*);extern int	sysisdir(char*);extern int	syskill(int);extern int	syskillpg(int);extern int	syscreate(char*, int, ulong);extern Mlock	*trylock(char *);extern void	exit(int);extern void	pipesig(int*);extern void	pipesigoff(void);extern int	holdon(void);extern void	holdoff(int);extern int	syscreatelocked(char*, int, int);extern int	sysopenlocked(char*, int);extern int	sysunlockfile(int);extern int	sysfiles(void);extern int 	become(char**, char*);extern int	sysdetach(void);extern int	sysdirreadall(int, Dir**);extern String	*username(String*);extern char*	remoteaddr(int, char*);extern int	creatembox(char*, char*); extern String	*readlock(String*);extern char	*homedir(char*);extern String	*mboxname(char*, String*);extern String	*deadletter(String*); /* *  maximum size for a file path */#define MAXPATHLEN 128