unp.h的安装以及第一个程序的运行

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unp.h的安装以及第一个程序的运行

  1. 源代码下载以及编译

    点击此处下载源代码

    解压到本地文件夹,如果访问不了GitHub的话就用我搬到gitee的仓库吧

    git clone https://gitee.com/Find-ing/unpv13e.git
    

    直接这样就不用解压了

    这里可以看看README

    按照README上的顺序

    首先执行./configure

    然后

    cd lib
    make
    cd ../libfree
    make
    cd ../libroute
    make
    

    如果出现了错误,就再来一次

    cd ../lib
    make
    cd ../libfree
    make
    cd ../libroute
    make
    

    第二遍做完之后,如果出现了如下错误:

    [root@docker libfree]# cd ../libroute
    [root@docker libroute]# make
    gcc -I../lib -g -O2 -D_REENTRANT -Wall   -c -o get_rtaddrs.o get_rtaddrs.c
    In file included from get_rtaddrs.c:1:
    unproute.h:3:10: fatal error: net/if_dl.h: No such file or directory
     #include <net/if_dl.h>  /* sockaddr_sdl */
              ^~~~~~~~~~~~~
    compilation terminated.
    make: *** [<builtin>: get_rtaddrs.o] Error 1
    

    哈哈哈,看了半天教程,改了好久也没搞好,仔细看看README,我真是

​ 好,仔细看看README怎么说的

>     cd ../libroute # only if your system supports 4.4BSD style routing sockets
>     make           # only if your system supports 4.4BSD style routing sockets

<font color=\'red\'>only if your system supports 4.4BSD style routing sockets</font>

okok,下一步

​ 可以看到内容已经被编译到unpv13e/libunp.a里面去了

  1. 拷贝

    sudo cp libunp.a /usr/lib
    sudo cp libunp.a /usr/lib64
    # 有的系统可能没有这个文件夹,那就不用拷贝这个了,反正我的有
    

    .\\lib\\unp.h中将#include "../config.h"改为#include "config.h"

    然后

    sudo cp config.h /usr/include
    sudo cp lib/unp.h /usr/include
    
  2. 现在是第三阶段,因为我们在运行代码时会报一个错

    /tmp/ccM5DNZP.o: In function `main\':
    test.c:(.text+0x2c): undefined reference to `err_quit\'
    test.c:(.text+0x58): undefined reference to `err_sys\'
    test.c:(.text+0xd2): undefined reference to `err_quit\'
    test.c:(.text+0xfe): undefined reference to `err_sys\'
    test.c:(.text+0x13a): undefined reference to `err_sys\'
    test.c:(.text+0x171): undefined reference to `err_sys\'
    collect2: error: ld returned 1 exit status
    

    原因是err_quit,err_sys等这些函数都是作者自己定义的函数真正的函数在http://www.apuebook.com/code3e.html下载。

    error.c的文件名改为myerr.c

    apue.h文件最后一行#endif /* _APUE_H */前加入#include "myerr.c"

    unp.h中加入#include "apue.h"

    apue.hmyerr.c文件都拷贝到/usr/include中去

    上面这些改改找找的操作各位要是想做就可以做一遍,如果是在不想做,就按照下面的操作

    打开/usr/include

    然后删除unp.h里面所有内容,然后复制这一段粘进去

    /* include unph */
    /* Our own header.  Tabs are set for 4 spaces, not 8 */
    
    #ifndef	__unp_h
    #define	__unp_h
    #include "apue.h"
    #include	"config.h"	/* configuration options for current OS */
    							/* "../config.h" is generated by configure */
    #define MAX_LINE 2048
    /* If anything changes in the following list of #includes, must change
       acsite.m4 also, for configure\'s tests. */
    
    #include	<sys/types.h>	/* basic system data types */
    #include	<sys/socket.h>	/* basic socket definitions */
    #if TIME_WITH_SYS_TIME
    #include	<sys/time.h>	/* timeval for select() */
    #include	<time.h>		/* timespec for pselect() */
    #else
    #if HAVE_SYS_TIME_H
    #include	<sys/time.h>	/* includes <time.h> unsafely */
    #else
    #include	<time.h>		/* old system? */
    #endif
    #endif
    #include	<netinet/in.h>	/* sockaddr_in and other Internet defns */
    #include	<arpa/inet.h>	/* inet(3) functions */
    #include	<errno.h>
    #include	<fcntl.h>		/* for nonblocking */
    #include	<netdb.h>
    #include	<signal.h>
    #include	<stdio.h>
    #include	<stdlib.h>
    #include	<string.h>
    #include	<sys/stat.h>	/* for S_xxx file mode constants */
    #include	<sys/uio.h>		/* for iovec and readv/writev */
    #include	<unistd.h>
    #include	<sys/wait.h>
    #include	<sys/un.h>		/* for Unix domain sockets */
    
    #ifdef	HAVE_SYS_SELECT_H
    # include	<sys/select.h>	/* for convenience */
    #endif
    
    #ifdef	HAVE_SYS_SYSCTL_H
    #ifdef	HAVE_SYS_PARAM_H
    # include	<sys/param.h>	/* OpenBSD prereq for sysctl.h */
    #endif
    # include	<sys/sysctl.h>
    #endif
    
    #ifdef	HAVE_POLL_H
    # include	<poll.h>		/* for convenience */
    #endif
    
    #ifdef	HAVE_SYS_EVENT_H
    # include	<sys/event.h>	/* for kqueue */
    #endif
    
    #ifdef	HAVE_STRINGS_H
    # include	<strings.h>		/* for convenience */
    #endif
    
    /* Three headers are normally needed for socket/file ioctl\'s:
     * <sys/ioctl.h>, <sys/filio.h>, and <sys/sockio.h>.
     */
    #ifdef	HAVE_SYS_IOCTL_H
    # include	<sys/ioctl.h>
    #endif
    #ifdef	HAVE_SYS_FILIO_H
    # include	<sys/filio.h>
    #endif
    #ifdef	HAVE_SYS_SOCKIO_H
    # include	<sys/sockio.h>
    #endif
    
    #ifdef	HAVE_PTHREAD_H
    # include	<pthread.h>
    #endif
    
    #ifdef HAVE_NET_IF_DL_H
    # include	<net/if_dl.h>
    #endif
    
    #ifdef HAVE_NETINET_SCTP_H
    #include	<netinet/sctp.h>
    #endif
    
    /* OSF/1 actually disables recv() and send() in <sys/socket.h> */
    #ifdef	__osf__
    #undef	recv
    #undef	send
    #define	recv(a,b,c,d)	recvfrom(a,b,c,d,0,0)
    #define	send(a,b,c,d)	sendto(a,b,c,d,0,0)
    #endif
    
    #ifndef	INADDR_NONE
    /* $$.Ic INADDR_NONE$$ */
    #define	INADDR_NONE	0xffffffff	/* should have been in <netinet/in.h> */
    #endif
    
    #ifndef	SHUT_RD				/* these three POSIX names are new */
    #define	SHUT_RD		0	/* shutdown for reading */
    #define	SHUT_WR		1	/* shutdown for writing */
    #define	SHUT_RDWR	2	/* shutdown for reading and writing */
    /* $$.Ic SHUT_RD$$ */
    /* $$.Ic SHUT_WR$$ */
    /* $$.Ic SHUT_RDWR$$ */
    #endif
    
    /* *INDENT-OFF* */
    #ifndef INET_ADDRSTRLEN
    /* $$.Ic INET_ADDRSTRLEN$$ */
    #define	INET_ADDRSTRLEN		16	/* "ddd.ddd.ddd.ddd\\0"
    								    1234567890123456 */
    #endif
    
    /* Define following even if IPv6 not supported, so we can always allocate
       an adequately sized buffer without #ifdefs in the code. */
    #ifndef INET6_ADDRSTRLEN
    /* $$.Ic INET6_ADDRSTRLEN$$ */
    #define	INET6_ADDRSTRLEN	46	/* max size of IPv6 address string:
    				   "xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx" or
    				   "xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd\\0"
    				    1234567890123456789012345678901234567890123456 */
    #endif
    /* *INDENT-ON* */
    
    /* Define bzero() as a macro if it\'s not in standard C library. */
    #ifndef	HAVE_BZERO
    #define	bzero(ptr,n)		memset(ptr, 0, n)
    /* $$.If bzero$$ */
    /* $$.If memset$$ */
    #endif
    
    /* Older resolvers do not have gethostbyname2() */
    #ifndef	HAVE_GETHOSTBYNAME2
    #define	gethostbyname2(host,family)		gethostbyname((host))
    #endif
    
    /* The structure returned by recvfrom_flags() */
    struct unp_in_pktinfo 
      struct in_addr	ipi_addr;	/* dst IPv4 address */
      int				ipi_ifindex;/* received interface index */
    ;
    /* $$.It unp_in_pktinfo$$ */
    /* $$.Ib ipi_addr$$ */
    /* $$.Ib ipi_ifindex$$ */
    
    /* We need the newer CMSG_LEN() and CMSG_SPACE() macros, but few
       implementations support them today.  These two macros really need
        an ALIGN() macro, but each implementation does this differently. */
    #ifndef	CMSG_LEN
    /* $$.Im CMSG_LEN$$ */
    #define	CMSG_LEN(size)		(sizeof(struct cmsghdr) + (size))
    #endif
    #ifndef	CMSG_SPACE
    /* $$.Im CMSG_SPACE$$ */
    #define	CMSG_SPACE(size)	(sizeof(struct cmsghdr) + (size))
    #endif
    
    /* POSIX requires the SUN_LEN() macro, but not all implementations DefinE
       it (yet).  Note that this 4.4BSD macro works regardless whether there is
       a length field or not. */
    #ifndef	SUN_LEN
    /* $$.Im SUN_LEN$$ */
    # define	SUN_LEN(su) \\
    	(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
    #endif
    
    /* POSIX renames "Unix domain" as "local IPC."
       Not all systems DefinE AF_LOCAL and PF_LOCAL (yet). */
    #ifndef	AF_LOCAL
    #define AF_LOCAL	AF_UNIX
    #endif
    #ifndef	PF_LOCAL
    #define PF_LOCAL	PF_UNIX
    #endif
    
    /* POSIX requires that an #include of <poll.h> DefinE INFTIM, but many
       systems still DefinE it in <sys/stropts.h>.  We don\'t want to include
       all the STREAMS stuff if it\'s not needed, so we just DefinE INFTIM here.
       This is the standard value, but there\'s no guarantee it is -1. */
    #ifndef INFTIM
    #define INFTIM          (-1)    /* infinite poll timeout */
    /* $$.Ic INFTIM$$ */
    #ifdef	HAVE_POLL_H
    #define	INFTIM_UNPH				/* tell unpxti.h we defined it */
    #endif
    #endif
    
    /* Following could be derived from SOMAXCONN in <sys/socket.h>, but many
       kernels still #define it as 5, while actually supporting many more */
    #define	LISTENQ		1024	/* 2nd argument to listen() */
    
    /* Miscellaneous constants */
    #define	MAXLINE		4096	/* max text line length */
    #define	BUFFSIZE	8192	/* buffer size for reads and writes */
    
    /* Define some port number that can be used for our examples */
    #define	SERV_PORT		 9877			/* TCP and UDP */
    #define	SERV_PORT_STR	"9877"			/* TCP and UDP */
    #define	UNIXSTR_PATH	"/tmp/unix.str"	/* Unix domain stream */
    #define	UNIXDG_PATH		"/tmp/unix.dg"	/* Unix domain datagram */
    /* $$.ix [LISTENQ]~constant,~definition~of$$ */
    /* $$.ix [MAXLINE]~constant,~definition~of$$ */
    /* $$.ix [BUFFSIZE]~constant,~definition~of$$ */
    /* $$.ix [SERV_PORT]~constant,~definition~of$$ */
    /* $$.ix [UNIXSTR_PATH]~constant,~definition~of$$ */
    /* $$.ix [UNIXDG_PATH]~constant,~definition~of$$ */
    
    /* Following shortens all the typecasts of pointer arguments: */
    #define	SA	struct sockaddr
    
    #ifndef HAVE_STRUCT_SOCKADDR_STORAGE
    /*
     * RFC 3493: protocol-independent placeholder for socket addresses
     */
    #define	__SS_MAXSIZE	128
    #define	__SS_ALIGNSIZE	(sizeof(int64_t))
    #ifdef HAVE_SOCKADDR_SA_LEN
    #define	__SS_PAD1SIZE	(__SS_ALIGNSIZE - sizeof(u_char) - sizeof(sa_family_t))
    #else
    #define	__SS_PAD1SIZE	(__SS_ALIGNSIZE - sizeof(sa_family_t))
    #endif
    #define	__SS_PAD2SIZE	(__SS_MAXSIZE - 2*__SS_ALIGNSIZE)
    
    struct sockaddr_storage 
    #ifdef HAVE_SOCKADDR_SA_LEN
    	u_char		ss_len;
    #endif
    	sa_family_t	ss_family;
    	char		__ss_pad1[__SS_PAD1SIZE];
    	int64_t		__ss_align;
    	char		__ss_pad2[__SS_PAD2SIZE];
    ;
    #endif
    
    #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 */
    
    #define	min(a,b)	((a) < (b) ? (a) : (b))
    #define	max(a,b)	((a) > (b) ? (a) : (b))
    
    #ifndef	HAVE_ADDRINFO_STRUCT
    # include	"../lib/addrinfo.h"
    #endif
    
    #ifndef	HAVE_IF_NAMEINDEX_STRUCT
    struct if_nameindex 
      unsigned int   if_index;  /* 1, 2, ... */
      char          *if_name;   /* null-terminated name: "le0", ... */
    ;
    /* $$.It if_nameindex$$ */
    /* $$.Ib if_index$$ */
    /* $$.Ib if_name$$ */
    #endif
    
    #ifndef	HAVE_TIMESPEC_STRUCT
    struct timespec 
      time_t	tv_sec;		/* seconds */
      long		tv_nsec;	/* and nanoseconds */
    ;
    /* $$.It timespec$$ */
    /* $$.Ib tv_sec$$ */
    /* $$.Ib tv_nsec$$ */
    #endif
    /* end unph */
    
    			/* prototypes for our own library functions */
    int		 connect_nonb(int, const SA *, socklen_t, int);
    int		 connect_timeo(int, const SA *, socklen_t, int);
    int	 daemon_init(const char *, int);
    void	 daemon_inetd(const char *, int);
    void	 dg_cli(FILE *, int, const SA *, socklen_t);
    void	 dg_echo(int, SA *, socklen_t);
    int		 family_to_level(int);
    char	*gf_time(void);
    void	 heartbeat_cli(int, int, int);
    void	 heartbeat_serv(int, int, int);
    struct addrinfo *host_serv(const char *, const char *, int, int);
    int		 inet_srcrt_add(char *);
    u_char  *inet_srcrt_init(int);
    void	 inet_srcrt_print(u_char *, int);
    void	 inet6_srcrt_print(void *);
    char   **my_addrs(int *);
    int		 readable_timeo(int, int);
    ssize_t	 readline(int, void *, size_t);
    ssize_t	 readn(int, void *, size_t);
    ssize_t	 read_fd(int, void *, size_t, int *);
    ssize_t	 recvfrom_flags(int, void *, size_t, int *, SA *, socklen_t *,
    		 struct unp_in_pktinfo *);
    Sigfunc *signal_intr(int, Sigfunc *);
    int		 sock_bind_wild(int, int);
    int		 sock_cmp_addr(const SA *, const SA *, socklen_t);
    int		 sock_cmp_port(const SA *, const SA *, socklen_t);
    int		 sock_get_port(const SA *, socklen_t);
    void	 sock_set_addr(SA *, socklen_t, const void *);
    void	 sock_set_port(SA *, socklen_t, int);
    void	 sock_set_wild(SA *, socklen_t);
    char	*sock_ntop(const SA *, socklen_t);
    char	*sock_ntop_host(const SA *, socklen_t);
    int		 sockfd_to_family(int);
    void	 str_echo(int);
    void	 str_cli(FILE *, int);
    int		 tcp_connect(const char *, const char *);
    int		 tcp_listen(const char *, const char *, socklen_t *);
    void	 tv_sub(struct timeval *, struct timeval *);
    int		 udp_client(const char *, const char *, SA **, socklen_t *);
    int		 udp_connect(const char *, const char *);
    int		 udp_server(const char *, const char *, socklen_t *);
    int		 writable_timeo(int, int);
    ssize_t	 writen(int, const void *, size_t);
    ssize_t	 write_fd(int, void *, size_t, int);
    
    #ifdef	MCAST
    int		 mcast_leave(int, const SA *, socklen_t);
    int		 mcast_join(int, const SA *, socklen_t, const char *, u_int);
    int		 mcast_leave_source_group(int sockfd, const SA *src, socklen_t srclen,
    								  const SA *grp, socklen_t grplen);
    int		 mcast_join_source_group(int sockfd, const SA *src, socklen_t srclen,
    								 const SA *grp, socklen_t grplen,
    								 const char *ifname, u_int ifindex);
    int		 mcast_block_source(int sockfd, const SA *src, socklen_t srclen,
    							const SA *grp, socklen_t grplen);
    int		 mcast_unblock_source(int sockfd, const SA *src, socklen_t srclen,
    							  const SA *grp, socklen_t grplen);
    int		 mcast_get_if(int);
    int		 mcast_get_loop(int);
    int		 mcast_get_ttl(int);
    int		 mcast_set_if(int, const char *, u_int);
    int		 mcast_set_loop(int, int);
    int		 mcast_set_ttl(int, int);
    
    void	 Mcast_leave(int, const SA *, socklen_t);
    void	 Mcast_join(int, const SA *, socklen_t, const char *, u_int);
    void	 Mcast_leave_source_group(int sockfd, const SA *src, socklen_t srclen,
    								  const SA *grp, socklen_t grplen);
    void	 Mcast_join_source_group(int sockfd, const SA *src, socklen_t srclen,
    								 const SA *grp, socklen_t grplen,
    								 const char *ifname, u_int ifindex);
    void	 Mcast_block_source(int sockfd, const SA *src, socklen_t srclen,
    							const SA *grp, socklen_t grplen);
    void	 Mcast_unblock_source(int sockfd, const SA *src, socklen_t srclen,
    							  const SA *grp, socklen_t grplen);
    int		 Mcast_get_if(int);
    int		 Mcast_get_loop(int);
    int		 Mcast_get_ttl(int);
    void	 Mcast_set_if(int, const char *, u_int);
    void	 Mcast_set_loop(int, int);
    void	 Mcast_set_ttl(int, int);
    #endif
    
    uint16_t	in_cksum(uint16_t *, int);
    
    #ifndef	HAVE_GETADDRINFO_PROTO
    int		 getaddrinfo(const char *, const char *, const struct addrinfo *,
    					 struct addrinfo **);
    void	 freeaddrinfo(struct addrinfo *);
    char	*gai_strerror(int);
    #endif
    
    #ifndef	HAVE_GETNAMEINFO_PROTO
    int		 getnameinfo(const SA *, socklen_t, char *, size_t, char *, size_t, int);
    #endif
    
    #ifndef	HAVE_GETHOSTNAME_PROTO
    int		 gethostname(char *, int);
    #endif
    
    #ifndef	HAVE_HSTRERROR_PROTO
    const char	*hstrerror(int);
    #endif
    
    #ifndef	HAVE_IF_NAMETOINDEX_PROTO
    unsigned int	 if_nametoindex(const char *);
    char			*if_indextoname(unsigned int, char *);
    void			 if_freenameindex(struct if_nameindex *);
    struct if_nameindex *if_nameindex(void);
    #endif
    
    #ifndef	HAVE_INET_PTON_PROTO
    int			 inet_pton(int, const char *, void *);
    const char	*inet_ntop(int, const void *, char *, size_t);
    #endif
    
    #ifndef	HAVE_INET_ATON_PROTO
    int		 inet_aton(const char *, struct in_addr *);
    #endif
    
    #ifndef	HAVE_PSELECT_PROTO
    int		 pselect(int, fd_set *, fd_set *, fd_set *,
    				 const struct timespec *, const sigset_t *);
    #endif
    
    #ifndef	HAVE_SOCKATMARK_PROTO
    int		 sockatmark(int);
    #endif
    
    #ifndef	HAVE_SNPRINTF_PROTO
    int		 snprintf(char *, size_t, const char *, ...);
    #endif
    
    			/* prototypes for our own library wrapper functions */
    void	 Connect_timeo(int, const SA *, socklen_t, int);
    int		 Family_to_level(int);
    struct addrinfo *Host_serv(const char *, const char *, int, int);
    const char		*Inet_ntop(int, const void *, char *, size_t);
    void			 Inet_pton(int, const char *, void *);
    char			*If_indextoname(unsigned int, char *);
    unsigned int		 If_nametoindex(const char *);
    struct if_nameindex	*If_nameindex(void);
    char   **My_addrs(int *);
    ssize_t	 Read_fd(int, void *, size_t, int *);
    int		 Readable_timeo(int, int);
    ssize_t	 Recvfrom_flags(int, void *, size_t, int *, SA *, socklen_t *,
    		 struct unp_in_pktinfo *);
    Sigfunc *Signal(int, Sigfunc *);
    Sigfunc *Signal_intr(int, Sigfunc *);
    int		 Sock_bind_wild(int, int);
    char	*Sock_ntop(const SA *, socklen_t);
    char	*Sock_ntop_host(const SA *, socklen_t);
    int		 Sockfd_to_family(int);
    int		 Tcp_connect(const char *, const char *);
    int		 Tcp_listen(const char *, const char *, socklen_t *);
    int		 Udp_client(const char *, const char *, SA **, socklen_t *);
    int		 Udp_connect(const char *, const char *);
    int		 Udp_server(const char *, const char *, socklen_t *);
    ssize_t	 Write_fd(int, void *, size_t, int);
    int		 Writable_timeo(int, int);
    
    			/* prototypes for our Unix wrapper functions: see Sec errors */
    void	*Calloc(size_t, size_t);
    void	 Close(int);
    void	 Dup2(int, int);
    int		 Fcntl(int, int, int);
    void	 Gettimeofday(struct timeval *, void *);
    int		 Ioctl(int, int, void *);
    pid_t	 Fork(void);
    void	*Malloc(size_t);
    int	 Mkstemp(char *);
    void	*Mmap(void *, size_t, int, int, int, off_t);
    int		 Open(const char *, int, mode_t);
    void	 Pipe(int *fds);
    ssize_t	 Read(int, void *, size_t);
    void	 Sigaddset(sigset_t *, int);
    void	 Sigdelset(sigset_t *, int);
    void	 Sigemptyset(sigset_t *);
    void	 Sigfillset(sigset_t *);
    int		 Sigismember(const sigset_t *, int);
    void	 Sigpending(sigset_t *);
    void	 Sigprocmask(int, const sigset_t *, sigset_t *);
    char	*Strdup(const char *);
    long	 Sysconf(int);
    void	 Sysctl(int *, u_int, void *, size_t *, void *, size_t);
    void	 Unlink(const char *);
    pid_t	 Wait(int *);
    pid_t	 Waitpid(pid_t, int *, int);
    void	 Write(int, void *, size_t);
    
    			/* prototypes for our stdio wrapper functions: see Sec errors */
    void	 Fclose(FILE *);
    FILE	*Fdopen(int, const char *);
    char	*Fgets(char *, int, FILE *);
    FILE	*Fopen(const char *, const char *);
    void	 Fputs(const char *, FILE *);
    
    			/* prototypes for our socket wrapper functions: see Sec errors */
    int		 Accept(int, SA *, socklen_t *);
    void	 Bind(int, const SA *, socklen_t);
    void	 Connect(int, const SA *, socklen_t);
    void	 Getpeername(int, SA *, socklen_t *);
    void	 Getsockname(int, SA *, socklen_t *);
    void	 Getsockopt(int, int, int, void *, socklen_t *);
    #ifdef	HAVE_INET6_RTH_INIT
    int		 Inet6_rth_space(int, int);
    void	*Inet6_rth_init(void *, socklen_t, int, int);
    void	 Inet6_rth_add(void *, const struct in6_addr *);
    void	 Inet6_rth_reverse(const void *, void *);
    int		 Inet6_rth_segments(const void *);
    struct in6_addr *Inet6_rth_getaddr(const void *, int);
    #endif
    #ifdef	HAVE_KQUEUE
    int		 Kqueue(void);
    int		 Kevent(int, const struct kevent *, int,
    				struct kevent *, int, const struct timespec *);
    #endif
    void	 Listen(int, int);
    #ifdef	HAVE_POLL
    int		 Poll(struct pollfd *, unsigned long, int);
    #endif
    ssize_t	 Readline(int, void *, size_t);
    ssize_t	 Readn(int, void *, size_t);
    ssize_t	 Recv(int, void *, size_t, int);
    ssize_t	 Recvfrom(int, void *, size_t, int, SA *, socklen_t *);
    ssize_t	 Recvmsg(int, struct msghdr *, int);
    int		 Select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
    void	 Send(int, const void *, size_t, int);
    void	 Sendto(int, const void *, size_t, int, const SA *, socklen_t);
    void	 Sendmsg(int, const struct msghdr *, int);
    void	 Setsockopt(int, int, int, const void *, socklen_t);
    void	 Shutdown(int, int);
    int		 Sockatmark(int);
    int		 Socket(int, int, int);
    void	 Socketpair(int, int, int, int *);
    void	 Writen(int, void *, size_t);
    
    void	 err_dump(const char *, ...);
    void	 err_msg(const char *, ...);
    void	 err_quit(const char *, ...);
    void	 err_ret(const char *, ...);
    void	 err_sys(const char *, ...);
    
    #endif	/* __unp_h */
    
    

    新建一个apue.h,把下面这段粘贴进去

    /*
     * Our own header, to be included before all standard system headers.
     */
    #ifndef	_APUE_H
    #define	_APUE_H
    
    #define _POSIX_C_SOURCE 200809L
    
    #if defined(SOLARIS)		/* Solaris 10 */
    #define _XOPEN_SOURCE 600
    #else
    #define _XOPEN_SOURCE 700
    #endif
    
    #include <sys/types.h>		/* some systems still require this */
    #include <sys/stat.h>
    #include <sys/termios.h>	/* for winsize */
    #if defined(MACOS) || !defined(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 */
    
    #define	min(a,b)	((a) < (b) ? (a) : (b))
    #define	max(a,b)	((a) > (b) ? (a) : (b))
    
    /*
     * Prototypes for our own functions.
     */
    char	*path_alloc(size_t *);				/* Prog pathalloc */
    long	 open_max(void);					/* Prog openmax */
    
    int		 set_cloexec(int);					/* Prog setfd */
    void	 clr_fl(int, int);
    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 */
    
    void	 daemonize(const char *);			/* Prog daemoninit */
    
    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 */
    
    int		 fd_pipe(int *);					/* Prog sock_fdpipe */
    int		 recv_fd(int, ssize_t (*func)(int,
    		         const void *, size_t));	/* Prog recvfd_sockets */
    int		 send_fd(int, int);					/* Prog sendfd_sockets */
    int		 send_err(int, int,
    		          const char *);			/* Prog senderr */
    int		 serv_listen(const char *);			/* Prog servlisten_sockets */
    int		 serv_accept(int, uid_t *);			/* Prog servaccept_sockets */
    int		 cli_conn(const char *);			/* Prog cliconn_sockets */
    int		 buf_args(char *, int (*func)(int,
    		          char **));				/* Prog bufargs */
    
    int		 tty_cbreak(int);					/* Prog raw */
    int		 tty_raw(int);						/* Prog raw */
    int		 tty_reset(int);					/* Prog raw */
    void	 tty_atexit(void);					/* Prog raw */
    struct termios	*tty_termios(void);			/* Prog raw */
    
    int		 ptym_open(char *, int);			/* Prog ptyopen */
    int		 ptys_open(char *);					/* Prog ptyopen */
    #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_msg(const char *, ...);			/* App misc_source */
    void	err_dump(const char *, ...) __attribute__((noreturn));
    void	err_quit(const char *, ...) __attribute__((noreturn));
    void	err_cont(int, const char *, ...);
    void	err_exit(int, const char *, ...) __attribute__((noreturn));
    void	err_ret(const char *, ...);
    void	err_sys(const char *, ...) __attribute__((noreturn));
    
    void	log_msg(const char *, ...);			/* App misc_source */
    void	log_open(const char *, int, int);
    void	log_quit(const char *, ...) __attribute__((noreturn));
    void	log_ret(const char *, ...);
    void	log_sys(const char *, ...) __attribute__((noreturn));
    void	log_exit(int, const char *, ...) __attribute__((noreturn));
    
    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);
    #include "myerr.c"
    #endif	/* _APUE_H */
    
    

    再新建一个myerr.c,把下面内容填充进去

    #include "apue.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);
    
    
    /*
     * Nonfatal error unrelated to a system call.
     * Error code passed as explict parameter.
     * Print a message and return.
     */
    void
    err_cont(int error, const char *fmt, ...)
    
    	va_list		ap;
    
    	va_start(ap, fmt);
    	err_doit(1, error, fmt, ap);
    	va_end(ap);
    
    
    /*
     * 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-1, fmt, ap);
    	if (errnoflag)
    		snprintf(buf+strlen(buf), MAXLINE-strlen(buf)-1, ": %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 */
    
    
    
    

然后编译就成功了

然后运行就失败了

解决方案:

sudo apt-get install xinetd
# sudo yum install xinetd
vi /etc/xinetd.d/daytime

disable = yes改成disable = no

service daytime

    disable         = no
    type            = INTERNA:L
    id              = daytime-stream
    socket_type     = stream
    protocol        = tcp
    user            = root
    wait            = no

接下来:

sudo service xinetd reload
netstat -a -t | grep daytime # 确认服务正在运行

如果不行,报错了,就看看这篇照着做肯定行https://www.cnblogs.com/yewandemty/p/5396391.html(一般centOS可能会报错,Ubuntu一般不会报错)

照着做完之后代码运行成功:

我运行的代码:

#include    "unp.h"  
  
int  
main(int argc, char **argv)  
  
    int                 sockfd, n;  
    char                recvline[MAXLINE + 1];  
    struct sockaddr_in  servaddr;  
  
    if (argc != 2)  
        err_quit("usage: a.out <IPaddress>");  
  
    if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)  
        err_sys("socket error");  
  
    bzero(&servaddr, sizeof(servaddr));  
    servaddr.sin_family = AF_INET;  
    servaddr.sin_port   = htons(13);    /* daytime server */  
    if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0)  
        err_quit("inet_pton error for %s", argv[1]);  
  
    if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) < 0)  
        err_sys("connect error");  
  
    while ( (n = read(sockfd, recvline, MAXLINE)) > 0)   
        recvline[n] = 0;    /* null terminate */  
        if (fputs(recvline, stdout) == EOF)  
            err_sys("fputs error");  
      
    if (n < 0)  
        err_sys("read error");  
  
    exit(0);  



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