'apue.h' 'errno.c' Unix环境高级编程

在学习《Unix环境高级编程》的时候，要想书中的例子运行起来，需要添加两个头文件，一个是apue.h,另一个是errno.c,代码如下

《apue.h》/*apue.h位于 your_apue_path/inlcude 目录下*/

#ifndef _APUE_H
#define _APUE_H

#include <stdarg.h>

#define _XOPEN_SOURCE 600

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/termios.h>
#ifndef TIOCGWINSZ
#include <sys/ioctl.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#define MAXLINE 4096

#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
#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))

char *path_alloc(int *);
long open_max(void);
void clr_fl(int,int);
void set_fl(int,int);
void pr_exit(int);
void pr_mask(const char *);
Sigfunc *signal_intr(int,Sigfunc *);

int tty_cbreak(int);
int tty_raw(int);
int tty_reset(int);
int tty_atexit(void);
#ifdef ECHO /*only if has been included*/
struct termios *tty_termios(void);
#endif

void sleep_us(unsigned int);
ssize_t readn(int,void*,size_t);
ssize_t writen(int,const void*,size_t);
void daemonize(const char *);

int s_pipe(int *);
int recv_fd(int,ssize_t (*func)(int,const void*,size_t));
int send_fd(int,int, ...);
int send_err(int,int,const char*);
int serv_listen(const char *);
int serv_accept(int,uid_t*);
int cli_conn(const char *);
int buf_args(char *,int (*func)(int,char **));

int ptym_open(char *,int);
int ptys_open(char *);
#ifdef TIOCGWINSZ
pid_t pty_fork(int *,char *,int,const struct termios *,const struct winsize*);
#endif

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_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*, ...);
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 *, ...);
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);

#include "error.c" /*一定不要忘了添加这句*/
#endif


《error.c》 /* error.c位于your_apue_path/lib 目录下 */

#include "apue.h"
#include /* for definition of errno */
#include /* 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 */
}


将这两个文件复制到“/usr/include/”下面就OK了。

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