做个笔记，刚开始试试apue中的代码会遇到点问题，应该在/usr/include中加入这两个文件，一个apue.h，一个myerr.h，然后在代码中加入#include "myerr.h"
apue.h代码如下：
#ifndef _APUE_H
#define _APUE_H
#define _XOPEN_SOURCE 600 /* Single UNIX Specification, Version 3 */
#include /* some systems still require this */
#include
#include /* for winsize */
#ifndef TIOCGWINSZ
#include
#endif
#include /* for convenience */
#include /* for convenience */
#include /* for offsetof */
#include /* for convenience */
#include /* for convenience */
#include /* 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 *); /* Figure 2.15 */
long open_max(void); /* Figure 2.16 */
void clr_fl(int, int); /* Figure 3.11 */
void set_fl(int, int); /* Figure 3.11 */
void pr_exit(int); /* Figure 8.5 */
void pr_mask(const char *); /* Figure 10.14 */
Sigfunc *signal_intr(int, Sigfunc *); /* Figure 10.19 */
int tty_cbreak(int); /* Figure 18.20 */
int tty_raw(int); /* Figure 18.20 */
int tty_reset(int); /* Figure 18.20 */
void tty_atexit(void); /* Figure 18.20 */
#ifdef ECHO /* only if has been included */
struct termios *tty_termios(void); /* Figure 18.20 */
#endif
void sleep_us(unsigned int); /* Exercise 14.6 */
ssize_t readn(int, void *, size_t); /* Figure 14.29 */
ssize_t writen(int, const void *, size_t); /* Figure 14.29 */
void daemonize(const char *); /* Figure 13.1 */
int s_pipe(int *); /* Figures 17.6 and 17.13 */
int recv_fd(int, ssize_t (*func)(int,
const void *, size_t));/* Figures 17.21 and 17.23 */
int send_fd(int, int); /* Figures 17.20 and 17.22 */
int send_err(int, int,
const char *); /* Figure 17.19 */
int serv_listen(const char *); /* Figures 17.10 and 17.15 */
int serv_accept(int, uid_t *); /* Figures 17.11 and 17.16 */
int cli_conn(const char *); /* Figures 17.12 and 17.17 */
int buf_args(char *, int (*func)(int,
char **)); /* Figure 17.32 */
int ptym_open(char *, int); /* Figures 19.8, 19.9, and 19.10 */
int ptys_open(char *); /* Figures 19.8, 19.9, and 19.10 */
#ifdef TIOCGWINSZ
pid_t pty_fork(int *, char *, int, const struct termios *,
const struct winsize *); /* Figure 19.11 */
#endif
int lock_reg(int, int, int, off_t, int, off_t); /* Figure 14.5 */
#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); /* Figure 14.6 */
#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 *, ...); /* Appendix B */
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 *, ...); /* 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); /* parent/child from Section 8.9 */
void TELL_PARENT(pid_t);
void TELL_CHILD(pid_t);
void WAIT_PARENT(void);
void WAIT_CHILD(void);
#endif /* _APUE_H */
myerr.h中的代码如下：
#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, " ");
fflush(stdout); /* in case stdout and stderr are the same */
fputs(buf, stderr);
fflush(NULL); /* flushes all stdio output streams */
}
然后运行即可。
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