[置頂] <UNIX環境高級編程>中的 "apue.h"


/************** 
*
*apueerror.h
*
*************/
#include <apue.h>
#include <stdio.h>
#include <errno.h> /* for definition of errno */

#include <stdarg.h> /* ISO C variable aruments */

static void err_doit(int, int, const char *, va_list);
/*
* Nonfatal error related to a system call.
* Print a message and return.
*/
void err_ret(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
err_doit(1, errno, fmt, ap);
va_end(ap);
}


/*
* Fatal error related to a system call.
* Print a message and terminate.
*/
void err_sys(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
err_doit(1, errno, fmt, ap);
va_end(ap);
exit(1);
}


/*
* Fatal error unrelated to a system call.
* Error code passed as explict parameter.
* Print a message and terminate.
*/
void err_exit(int error, const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
err_doit(1, error, fmt, ap);
va_end(ap);
exit(1);
}


/*
* Fatal error related to a system call.
* Print a message, dump core, and terminate.
*/
void err_dump(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
err_doit(1, errno, fmt, ap);
va_end(ap);
abort(); /* dump core and terminate */
exit(1); /* shouldn't get here */
}


/*
* Nonfatal error unrelated to a system call.
* Print a message and return.
*/
void err_msg(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
err_doit(0, 0, fmt, ap);
va_end(ap);
}


/*
* Fatal error unrelated to a system call.
* Print a message and terminate.
*/
void err_quit(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
err_doit(0, 0, fmt, ap);
va_end(ap);
exit(1);
}


/*
* Print a message and return to caller.
* Caller specifies "errnoflag".
*/
static void err_doit(int errnoflag, int error, const char *fmt, va_list ap)
{
char buf[MAXLINE];
vsnprintf(buf, MAXLINE, fmt, ap);
if (errnoflag)
snprintf(buf+strlen(buf), MAXLINE-strlen(buf), ": %s",
strerror(error));
strcat(buf, "\n");
fflush(stdout); /* in case stdout and stderr are the same */
fputs(buf, stderr);
fflush(NULL); /* flushes all stdio output streams */
}


apue.h

/* Our own header, to be included before all standard system headers */    #ifndef _APUE_H  #define _APUE_H    #if defined(SOLARIS)  #define _XOPEN_SOURCE   500 /* Single UNIX Specification, Version 2  for Solaris 9 */  #define CMSG_LEN(x) _CMSG_DATA_ALIGN(sizeof(struct cmsghdr)+(x))  #elif !defined(BSD)  #define _XOPEN_SOURCE   600 /* Single UNIX Specification, Version 3 */  #endif    #include <sys/types.h>        /* some systems still require this */  #include <sys/stat.h>  #include <sys/termios.h>  /* for winsize */  #ifndef TIOCGWINSZ  #include <sys/ioctl.h>  #endif  #include <stdio.h>        /* for convenience */  #include <stdlib.h>       /* for convenience */  #include <stddef.h>       /* for offsetof */  #include <string.h>       /* for convenience */  #include <unistd.h>       /* for convenience */  #include <signal.h>       /* for SIG_ERR */    #define MAXLINE 4096            /* max line length */    /*  * Default file access permissions for new files.  */  #define FILE_MODE   (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)    /*  * Default permissions for new directories.  */  #define DIR_MODE    (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)    typedef void    Sigfunc(int);   /* for signal handlers */    #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} */  long     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_writen} */  ssize_t  writen(int, const void *, size_t); /* {Prog readn_writen} */  void     daemonize(const char *);           /* {Prog daemoninit} */    int      s_pipe(int *);                 /* {Progs streams_spipe sock_spipe} */  int      recv_fd(int, ssize_t (*func)(int,                   const void *, size_t));/* {Progs recvfd_streams recvfd_sockets} */  int      send_fd(int, int);             /* {Progs sendfd_streams sendfd_sockets} */  int      send_err(int, int,                    const char *);        /* {Prog senderr} */  int      serv_listen(const char *);     /* {Progs servlisten_streams servlisten_sockets} */  int      serv_accept(int, uid_t *);     /* {Progs servaccept_streams servaccept_sockets} */  int      cli_conn(const char *);        /* {Progs cliconn_streams cliconn_sockets} */  int      buf_args(char *, int (*func)(int,                    char **));            /* {Prog bufargs} */    int      ptym_open(char *, int);    /* {Progs3 ptyopen_streams ptyopen_bsd ptyopen_linux} */  int      ptys_open(char *);         /* {Progs3 ptyopen_streams ptyopen_bsd ptyopen_linux} */  #ifdef  TIOCGWINSZ  pid_t    pty_fork(int *, char *, int, 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_read_lockable(fd, offset, whence, len) \              (lock_test((fd), F_RDLCK, (offset), (whence), (len)) == 0)  #define is_write_lockable(fd, offset, whence, len) \              (lock_test((fd), F_WRLCK, (offset), (whence), (len)) == 0)    void    err_dump(const char *, ...);        /* {App misc_source} */  void    err_msg(const char *, ...);  void    err_quit(const char *, ...);  void    err_exit(int, 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  /* _APUE_H */  

如上給出了apue.h和apueerror.h的代碼,只需要在apueerror.h中包含apue.h,然后在自己寫的源碼中包含apueerror.h這個頭文件即可.



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