先看看这个链接
unp.h
unp.h /* include unph *//* Our own header. Tabs are set for 4 spaces, not 8 */#ifndef __unp_h#define __unp_h#include "../config.h" /* configuration options for current OS */ /* "../config.h" is generated by configure *//* If anything changes in the following list of #includes, must change acsite.m4 also, for configure's tests. */#include/* basic system data types */#include /* basic socket definitions */#if TIME_WITH_SYS_TIME#include /* timeval{} for select() */#include /* timespec{} for pselect() */#else#if HAVE_SYS_TIME_H#include /* includes unsafely */#else#include /* old system? */#endif#endif#include /* sockaddr_in{} and other Internet defns */#include /* inet(3) functions */#include #include /* for nonblocking */#include #include #include #include #include #include /* for S_xxx file mode constants */#include /* for iovec{} and readv/writev */#include #include #include /* for Unix domain sockets */#ifdef HAVE_SYS_SELECT_H# include /* for convenience */#endif#ifdef HAVE_SYS_SYSCTL_H#ifdef HAVE_SYS_PARAM_H# include /* OpenBSD prereq for sysctl.h */#endif# include #endif#ifdef HAVE_POLL_H# include /* for convenience */#endif#ifdef HAVE_SYS_EVENT_H# include /* for kqueue */#endif#ifdef HAVE_STRINGS_H# include /* for convenience */#endif/* Three headers are normally needed for socket/file ioctl's: * , , and . */#ifdef HAVE_SYS_IOCTL_H# include #endif#ifdef HAVE_SYS_FILIO_H# include #endif#ifdef HAVE_SYS_SOCKIO_H# include #endif#ifdef HAVE_PTHREAD_H# include #endif#ifdef HAVE_NET_IF_DL_H# include #endif#ifdef HAVE_NETINET_SCTP_H#include #endif/* OSF/1 actually disables recv() and send() in */#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 */#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 DefinE INFTIM, but many systems still DefinE it in . 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 , 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_STRUCTstruct 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_STRUCTstruct 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 MCASTint 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);#endifuint16_t in_cksum(uint16_t *, int);#ifndef HAVE_GETADDRINFO_PROTOint getaddrinfo(const char *, const char *, const struct addrinfo *, struct addrinfo **);void freeaddrinfo(struct addrinfo *);char *gai_strerror(int);#endif#ifndef HAVE_GETNAMEINFO_PROTOint getnameinfo(const SA *, socklen_t, char *, size_t, char *, size_t, int);#endif#ifndef HAVE_GETHOSTNAME_PROTOint gethostname(char *, int);#endif#ifndef HAVE_HSTRERROR_PROTOconst char *hstrerror(int);#endif#ifndef HAVE_IF_NAMETOINDEX_PROTOunsigned 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_PROTOint inet_pton(int, const char *, void *);const char *inet_ntop(int, const void *, char *, size_t);#endif#ifndef HAVE_INET_ATON_PROTOint inet_aton(const char *, struct in_addr *);#endif#ifndef HAVE_PSELECT_PROTOint pselect(int, fd_set *, fd_set *, fd_set *, const struct timespec *, const sigset_t *);#endif#ifndef HAVE_SOCKATMARK_PROTOint sockatmark(int);#endif#ifndef HAVE_SNPRINTF_PROTOint 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_INITint 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_KQUEUEint Kqueue(void);int Kevent(int, const struct kevent *, int, struct kevent *, int, const struct timespec *);#endifvoid Listen(int, int);#ifdef HAVE_POLLint Poll(struct pollfd *, unsigned long, int);#endifssize_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 */
config.h
config.h /* config.h. Generated by configure. *//* config.h.in. Generated from configure.in by autoheader. *//* CPU, vendor, and operating system */#define CPU_VENDOR_OS "i686-pc-linux-gnu"/* Define to 1 ifdefines struct addrinfo */#define HAVE_ADDRINFO_STRUCT 1/* Define to 1 if you have the header file. */#define HAVE_ARPA_INET_H 1/* Define to 1 if you have the `bzero' function. */#define HAVE_BZERO 1/* Define to 1 if the /dev/streams/xtiso/tcp device exists *//* #undef HAVE_DEV_STREAMS_XTISO_TCP *//* Define to 1 if the /dev/tcp device exists *//* #undef HAVE_DEV_TCP *//* Define to 1 if the /dev/xti/tcp device exists *//* #undef HAVE_DEV_XTI_TCP *//* Define to 1 if you have the header file. */#define HAVE_ERRNO_H 1/* Define to 1 if you have the header file. */#define HAVE_FCNTL_H 1/* Define to 1 if you have the `getaddrinfo' function. */#define HAVE_GETADDRINFO 1/* define if getaddrinfo prototype is in */#define HAVE_GETADDRINFO_PROTO 1/* Define to 1 if you have the `gethostbyname2' function. */#define HAVE_GETHOSTBYNAME2 1/* Define to 1 if you have the `gethostbyname_r' function. */#define HAVE_GETHOSTBYNAME_R 1/* Define to 1 if you have the `gethostname' function. */#define HAVE_GETHOSTNAME 1/* define if gethostname prototype is in */#define HAVE_GETHOSTNAME_PROTO 1/* Define to 1 if you have the `getnameinfo' function. */#define HAVE_GETNAMEINFO 1/* define if getnameinfo prototype is in */#define HAVE_GETNAMEINFO_PROTO 1/* define if getrusage prototype is in */#define HAVE_GETRUSAGE_PROTO 1/* Define to 1 if you have the `hstrerror' function. */#define HAVE_HSTRERROR 1/* define if hstrerror prototype is in */#define HAVE_HSTRERROR_PROTO 1/* Define to 1 if defines struct if_nameindex */#define HAVE_IF_NAMEINDEX_STRUCT 1/* Define to 1 if you have the `if_nametoindex' function. */#define HAVE_IF_NAMETOINDEX 1/* define if if_nametoindex prototype is in */#define HAVE_IF_NAMETOINDEX_PROTO 1/* Define to 1 if you have the `inet6_rth_init' function. */#define HAVE_INET6_RTH_INIT 1/* Define to 1 if you have the `inet_aton' function. */#define HAVE_INET_ATON 1/* define if inet_aton prototype is in */#define HAVE_INET_ATON_PROTO 1/* Define to 1 if you have the `inet_pton' function. */#define HAVE_INET_PTON 1/* define if inet_pton prototype is in */#define HAVE_INET_PTON_PROTO 1/* Define to 1 if you have the `kevent' function. *//* #undef HAVE_KEVENT *//* Define to 1 if you have the `kqueue' function. *//* #undef HAVE_KQUEUE *//* Define to 1 if you have the `nsl' library (-lnsl). *//* #undef HAVE_LIBNSL *//* Define to 1 if you have the `pthread' library (-lpthread). */#define HAVE_LIBPTHREAD 1/* Define to 1 if you have the `pthreads' library (-lpthreads). *//* #undef HAVE_LIBPTHREADS *//* Define to 1 if you have the `resolv' library (-lresolv). *//* #undef HAVE_LIBRESOLV *//* Define to 1 if you have the `xti' library (-lxti). *//* #undef HAVE_LIBXTI *//* Define to 1 if you have the `mkstemp' function. */#define HAVE_MKSTEMP 1/* define if struct msghdr contains the msg_control member */#define HAVE_MSGHDR_MSG_CONTROL 1/* Define to 1 if you have the header file. *//* #undef HAVE_NETCONFIG_H *//* Define to 1 if you have the header file. */#define HAVE_NETDB_H 1/* Define to 1 if you have the header file. *//* #undef HAVE_NETDIR_H *//* Define to 1 if you have the header file. */#define HAVE_NETINET_IN_H 1/* Define to 1 if you have the header file. *//* #undef HAVE_NET_IF_DL_H *//* Define to 1 if you have the `poll' function. */#define HAVE_POLL 1/* Define to 1 if you have the header file. */#define HAVE_POLL_H 1/* Define to 1 if you have the `pselect' function. */#define HAVE_PSELECT 1/* define if pselect prototype is in */#define HAVE_PSELECT_PROTO 1/* Define to 1 if you have the header file. */#define HAVE_PTHREAD_H 1/* Define to 1 if you have the header file. */#define HAVE_SIGNAL_H 1/* Define to 1 if you have the `snprintf' function. */#define HAVE_SNPRINTF 1/* define if snprintf prototype is in */#define HAVE_SNPRINTF_PROTO 1/* Define to 1 if defines struct sockaddr_dl *//* #undef HAVE_SOCKADDR_DL_STRUCT *//* define if socket address structures have length fields *//* #undef HAVE_SOCKADDR_SA_LEN *//* Define to 1 if you have the `sockatmark' function. */#define HAVE_SOCKATMARK 1/* define if sockatmark prototype is in */#define HAVE_SOCKATMARK_PROTO 1/* Define to 1 if you have the header file. */#define HAVE_STDIO_H 1/* Define to 1 if you have the header file. */#define HAVE_STDLIB_H 1/* Define to 1 if you have the header file. */#define HAVE_STRINGS_H 1/* Define to 1 if you have the header file. */#define HAVE_STRING_H 1/* Define to 1 if you have the header file. *//* #undef HAVE_STROPTS_H *//* Define to 1 if `ifr_mtu' is member of `struct ifreq'. */#define HAVE_STRUCT_IFREQ_IFR_MTU 1/* Define to 1 if the system has the type `struct sockaddr_storage'. */#define HAVE_STRUCT_SOCKADDR_STORAGE 1/* Define to 1 if you have the header file. *//* #undef HAVE_SYS_EVENT_H *//* Define to 1 if you have the header file. *//* #undef HAVE_SYS_FILIO_H *//* Define to 1 if you have the header file. */#define HAVE_SYS_IOCTL_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_PARAM_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_SELECT_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_SOCKET_H 1/* Define to 1 if you have the header file. *//* #undef HAVE_SYS_SOCKIO_H *//* Define to 1 if you have the header file. */#define HAVE_SYS_STAT_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_SYSCTL_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_TIME_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_TYPES_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_UIO_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_UN_H 1/* Define to 1 if you have the header file. */#define HAVE_SYS_WAIT_H 1/* Define to 1 if or defines struct timespec */#define HAVE_TIMESPEC_STRUCT 1/* Define to 1 if you have the header file. */#define HAVE_TIME_H 1/* Define to 1 if you have the header file. */#define HAVE_UNISTD_H 1/* Define to 1 if you have the `vsnprintf' function. */#define HAVE_VSNPRINTF 1/* Define to 1 if you have the header file. *//* #undef HAVE_XTI_H *//* Define to 1 if you have the header file. *//* #undef HAVE_XTI_INET_H *//* Define to 1 if the system supports IPv4 */#define IPV4 1/* Define to 1 if the system supports IPv6 */#define IPV6 1/* Define to 1 if the system supports IPv4 */#define IPv4 1/* Define to 1 if the system supports IPv6 */#define IPv6 1/* Define to 1 if the system supports IP Multicast */#define MCAST 1/* Define to the address where bug reports for this package should be sent. */#define PACKAGE_BUGREPORT ""/* Define to the full name of this package. */#define PACKAGE_NAME ""/* Define to the full name and version of this package. */#define PACKAGE_STRING ""/* Define to the one symbol short name of this package. */#define PACKAGE_TARNAME ""/* Define to the version of this package. */#define PACKAGE_VERSION ""/* the size of the sa_family field in a socket address structure *//* #undef SA_FAMILY_T *//* Define to 1 if you have the ANSI C header files. */#define STDC_HEADERS 1/* Define to 1 if you can safely include both and . */#define TIME_WITH_SYS_TIME 1/* Define to 1 if the system supports UNIX domain sockets */#define UNIXDOMAIN 1/* Define to 1 if the system supports UNIX domain sockets */#define UNIXdomain 1/* 16 bit signed type *//* #undef int16_t *//* 32 bit signed type *//* #undef int32_t *//* the type of the sa_family struct member *//* #undef sa_family_t *//* unsigned integer type of the result of the sizeof operator *//* #undef size_t *//* a type appropriate for address *//* #undef socklen_t *//* define to __ss_family if sockaddr_storage has that instead of ss_family *//* #undef ss_family *//* a signed type appropriate for a count of bytes or an error indication *//* #undef ssize_t *//* scalar type */#define t_scalar_t int32_t/* unsigned scalar type */#define t_uscalar_t uint32_t/* 16 bit unsigned type *//* #undef uint16_t *//* 32 bit unsigned type *//* #undef uint32_t *//* 8-bit unsigned type *//* #undef uint8_t */
这是必需的两个头文件。。。很重要！！
当然我是看着这篇博客搞定的。。。。要管理员权限开启daytime服务
不过源程序不理解啊。。慢慢来吧
#include "unp.h"intmain(int argc, char **argv){ int sockfd, n; char recvline[MAXLINE + 1]; struct sockaddr_in servaddr; if (argc != 2) err_quit("usage: a.out "); 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);}