head.h

哲学家就餐问题的两种算法实现

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

#ifndef _ourhdr_h
#define _ourhdr_h

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define MAXLINE 4096

#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 */

typedef void Sigfunc(int);  /* for signal handlers */

#if defined(SIG_IGN) && !defined(SIG_ERR)
#define SIG_ERR ((Sigfun *)-1)
#endif

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

                  /* prototypes for our own functions */
char     *path_alloc(int *);             /* Program 2.2 */
int       open_max(void);                /* Program 2.3 */
void      clr_fl(int, int);              /* Program 3.5 */
void      set_fl(int, int);              /* Program 3.5 */
void      pr_exit(int);                  /* Program 8.3 */
void      pr_mask(const char *);         /* Program 10.10 */
Sigfunc  *signal_intr(int, Sigfunc *);   /* Program 10.13 */

int       tty_cbreak(int);               /* Program 11.10 */
int       tty_raw(int);                  /* Program 11.10 */
int       tty_reset(int);                /* Program 11.10 */
void      tty_atexit(void);              /* Program 11.10 */
#ifdef ECHO   /* only if <termios.h> has been included */
struct termios *tty_termios(void);       /* Program 11.10 */
#endif

void      sleep_us(unsigned int);        /* Exercise 12.6 */
ssize_t   readn(int, void *, size_t);    /* Program 12.13 */
ssize_t   writen(int, const void *, size_t);/* Program 12.12 */
int       daemon_init(void);             /* Program 13.1 */

int       s_pipe(int *);                 /* Program 15.2 and 15.3 */
int       recv_fd(int, ssize_t (*func)(int, const void *, size_t));
                                         /* Program 15.6 and 15.8 */
int       send_fd(int, int);             /* Program 15.5 and 15.7 */
int       send_err(int, int, const char *);/* Program 15.4 */
int       serv_listen(const char *);     /* Program 15.19 and 15.22 */
int       serv_accept(int, uid_t *);     /* Program 15.20 and 15.24 */
int       cli_conn(const char *);        /* Program 15.21 and 15.23 */
int       buf_args(char *, int (*func)(int, char **));
                                         /* Program 15.17 */

int       ptym_open(char *);             /* Program 19.1 and 19.2 */
int       pths_open(int, char *);        /* Program 19.1 and 19.2 */
#ifdef TIOCGWINSZ
pid_t     pty_fork(int *, char *, const struct termios *, const struct winsize *);                                       /* Program 19.3 */
#endif

int       lock_reg(int, int, int, off_t, int, off_t);
                                         /* Program 12.2 */
#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);    /* Program 12.3 */

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

void      err_dump(const char *, ...);   /* Appendix B */
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 *, ...);    /* Appendix B */
void      log_open(const char *, int, int);
void      log_quit(const char *, ...);
void      log_ret(const char *, ...);
void      log_sys(const char *, ...);

void      TELL_WAIT(void);
void      TELL_PARENT(pid_t);
void      TELL_CHILD(pid_t);
void      WAIT_PARENT(void);
void      WAIT_CHILD(void);

#endif    /* _ourhdr_h */