ourhdr.h

用Ｃ语言编的邮件系统（毕业论文）

/* Our own header, to be included *after* all standard system headers */

#ifndef	__ourhdr_h
#define	__ourhdr_h

#include	<sys/types.h>	/* required for some of our prototypes */
#include	<stdio.h>		/* for convenience */
#include	<stdlib.h>		/* for convenience */
#include	<string.h>		/* for convenience */
#include	<unistd.h>		/* for convenience */

#define	MAXLINE	4096			/* max line length */

#define	FILE_MODE	(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
					/* default file access permissions for new files */
#define	DIR_MODE	(FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)
					/* default permissions for new directories */
struct message
{
 char *to;
 char *from;
 time_t sendtime;
 time_t recvtime;
 char *messageid;
 char *subject;
 char *content;
};

/*struct message **msgpp;  */

#define	min(a,b)	((a) < (b) ? (a) : (b))
#define	max(a,b)	((a) > (b) ? (a) : (b))

int		lock_reg(int, int, int, off_t, int, off_t);
									
#define	read_lock(fd, offset, whence, len) \
			lock_reg(fd, F_SETLK, F_RDLCK, offset, whence, len)
#define	readw_lock(fd, offset, whence, len) \
			lock_reg(fd, F_SETLKW, F_RDLCK, offset, whence, len)
#define	write_lock(fd, offset, whence, len) \
			lock_reg(fd, F_SETLK, F_WRLCK, offset, whence, len)
#define	writew_lock(fd, offset, whence, len) \
			lock_reg(fd, F_SETLKW, F_WRLCK, offset, whence, len)
#define	un_lock(fd, offset, whence, len) \
			lock_reg(fd, F_SETLK, F_UNLCK, offset, whence, len)

pid_t	lock_test(int, int, off_t, int, off_t);
									

#define	is_readlock(fd, offset, whence, len) \
			lock_test(fd, F_RDLCK, offset, whence, len)
#define	is_writelock(fd, offset, whence, len) \
			lock_test(fd, F_WRLCK, offset, whence, len)

void	err_dump(const char *, ...);	
void	err_msg(const char *, ...);
void	err_quit(const char *, ...);
void	err_ret(const char *, ...);
void	err_sys(const char *, ...);

void	log_msg(const char *, ...);		
void	log_open(const char *, int, int);
void	log_quit(const char *, ...);
void	log_ret(const char *, ...);
void	log_sys(const char *, ...);



#endif	/* __ourhdr_h */