ourhdr.h

UNIX高级环境编程（第二版）文件系统部分的程序

/* 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 */

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

                    /* 4.3BSD Reno <signal.h> doesn't define SIG_ERR */
#if    defined(SIG_IGN) && !defined(SIG_ERR)
#define    SIG_ERR    ((Sigfunc *)-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 *);            /* {Prog pathalloc} */
int         open_max(void);            /* {Prog openmax} */
void     clr_fl(int, int);            /* {Prog setfl} */
void     set_fl(int, int);            /* {Prog setfl} */
void     pr_exit(int);                /* {Prog prexit} */
void     pr_mask(const char *);        /* {Prog prmask} */
Sigfunc    *signal_intr(int, Sigfunc *);/* {Prog signal_intr_function} */

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

void     sleep_us(unsigned int);    /* {Ex sleepus} */
ssize_t     readn(int, void *, size_t);/* {Prog readn} */
ssize_t     writen(int, const void *, size_t);/* {Prog writen} */
int         daemon_init(void);            /* {Prog daemoninit} */

int         s_pipe(int *);                /* {Progs svr4_spipe bsd_spipe} */
int         recv_fd(int, ssize_t (*func)(int, const void *, size_t));
                                    /* {Progs recvfd_svr4 recvfd_43bsd} */
int         send_fd(int, int);            /* {Progs sendfd_svr4 sendfd_43bsd} */
int         send_err(int, int, const char *);/* {Prog senderr} */
int         serv_listen(const char *);    /* {Progs servlisten_svr4 servlisten_44bsd} */
int         serv_accept(int, uid_t *);    /* {Progs servaccept_svr4 servaccept_44bsd} */
int         cli_conn(const char *);    /* {Progs cliconn_svr4 cliconn_44bsd} */
int         buf_args(char *, int (*func)(int, char **));
                                    /* {Prog bufargs} */

int         ptym_open(char *);            /* {Progs ptyopen_svr4 ptyopen_44bsd} */
int         ptys_open(int, char *);    /* {Progs ptyopen_svr4 ptyopen_44bsd} */
#ifdef    TIOCGWINSZ
pid_t     pty_fork(int *, char *, const struct termios *,
                  const struct winsize *);    /* {Prog ptyfork} */
#endif

int        lock_reg(int, int, int, off_t, int, off_t);
                                    /* {Prog lockreg} */
#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);
                                    /* {Prog locktest} */

#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 *, ...);    /* {App misc_source} */
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 *, ...);        /* {App misc_source} */
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);        /* parent/child from {Sec race_conditions} */
void    TELL_PARENT(pid_t);
void    TELL_CHILD(pid_t);
void    WAIT_PARENT(void);
void    WAIT_CHILD(void);

#endif    /* __ourhdr_h */