求unix网络编程第三版的unp.h

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1. 
   
2. /* Our own header. Tabs are set for 4 spaces, not 8 */
   
3. 
   
4. #ifndef __unp_h
   
5. #define __unp_h
   
6. 
   
7. #include    "../config.h"      /* configuration options for current OS */
   
8.                            /* "../config.h" is generated by configure */
   
9. 
   
10. /* If anything changes in the following list of #includes, must change
    
11.    acsite.m4 also, for configure's tests. */
    
12. 
    
13. #include    <sys/types.h>       /* basic system data types */
    
14. #include    <sys/socket.h>      /* basic socket definitions */
    
15. #include    <sys/time.h>        /* timeval{} for select() */
    
16. #include    <time.h>            /* timespec{} for pselect() */
    
17. #include    <netinet/in.h>      /* sockaddr_in{} and other Internet defns */
    
18. #include    <arpa/inet.h>       /* inet(3) functions */
    
19. #include    <errno.h>
    
20. #include    <fcntl.h>           /* for nonblocking */
    
21. #include    <netdb.h>
    
22. #include    <signal.h>
    
23. #include    <stdio.h>
    
24. #include    <stdlib.h>
    
25. #include    <string.h>
    
26. #include    <sys/stat.h>        /* for S_xxx file mode constants */
    
27. #include    <sys/uio.h>         /* for iovec{} and readv/writev */
    
28. #include    <unistd.h>
    
29. #include    <sys/wait.h>
    
30. #include    <sys/un.h>          /* for Unix domain sockets */
    
31. 
    
32. #ifdef  HAVE_SYS_SELECT_H
    
33. # include   <sys/select.h>      /* for convenience */
    
34. #endif
    
35. 
    
36. #ifdef  HAVE_SYS_SYSCTL_H
    
37. # include   <sys/sysctl.h>
    
38. #endif
    
39. 
    
40. #ifdef  HAVE_POLL_H
    
41. # include  <poll.h>             /* for convenience */
    
42. #endif
    
43. 
    
44. #ifdef  HAVE_SYS_EVENT_H
    
45. # include   <sys/event.h>       /* for kqueue */
    
46. #endif
    
47. 
    
48. #ifdef  HAVE_STRINGS_H
    
49. # include   <strings.h>         /* for convenience */
    
50. #endif
    
51. 
    
52. /* Three headers are normally needed for socket/file ioctl's:
    
53. * <sys/ioctl.h>, <sys/filio.h>, and <sys/sockio.h>.
    
54. */
    
55. #ifdef  HAVE_SYS_IOCTL_H
    
56. # include   <sys/ioctl.h>
    
57. #endif
    
58. #ifdef  HAVE_SYS_FILIO_H
    
59. # include   <sys/filio.h>
    
60. #endif
    
61. #ifdef  HAVE_SYS_SOCKIO_H
    
62. # include   <sys/sockio.h>
    
63. #endif
    
64. 
    
65. #ifdef  HAVE_PTHREAD_H
    
66. # include   <pthread.h>
    
67. #endif
    
68. 
    
69. #ifdef  HAVE_NET_IF_DL_H
    
70. # include    <net/if_dl.h>
    
71. #endif
    
72. 
    
73. #ifdef  HAVE_NETINET_SCTP_H
    
74. #include     <netinet/sctp.h>
    
75. #endif
    
76. 
    
77. /* OSF/1 actually disables recv() and send() in <sys/socket.h> */
    
78. #ifdef  __osf__
    
79. #undef  recv
    
80. #undef  send
    
81. #define recv(a,b,c,d)   recvfrom(a,b,c,d,0,0)
    
82. #define send(a,b,c,d)   sendto(a,b,c,d,0,0)
    
83. #endif
    
84. 
    
85. #ifndef INADDR_NONE
    
86. #define INADDR_NONE 0xffffffff  /* should have been in <netinet/in.h> */
    
87. #endif
    
88. 
    
89. #ifndef SHUT_RD                 /* these three POSIX names are new */
    
90. #define SHUT_RD     0           /* shutdown for reading */
    
91. #define SHUT_WR     1           /* shutdown for writing */
    
92. #define SHUT_RDWR   2           /* shutdown for reading and writing */
    
93. #endif
    
94. 
    
95. #ifndef INET_ADDRSTRLEN
    
96. #define INET_ADDRSTRLEN     16  /* "ddd.ddd.ddd.ddd\0"
    
97.                                    1234567890123456 */
    
98. #endif
    
99. 
    
100. /* Define following even if IPv6 not supported, so we can always allocate
     
101.    an adequately sized buffer without #ifdefs in the code. */
     
102. #ifndef INET6_ADDRSTRLEN
     
103. #define INET6_ADDRSTRLEN    46  /* max size of IPv6 address string:
     
104.                    "xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx" or
     
105.                    "xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:ddd.ddd.ddd.ddd\0"
     
106.                     1234567890123456789012345678901234567890123456 */
     
107. #endif
     
108. 
     
109. /* Define bzero() as a macro if it's not in standard C library. */
     
110. #ifndef HAVE_BZERO
     
111. #define bzero(ptr,n)        memset (ptr, 0, n)
     
112. #endif
     
113. 
     
114. /* Older resolvers do not have gethostbyname2() */
     
115. #ifndef HAVE_GETHOSTBYNAME2
     
116. #define gethostbyname2(host,family)     gethostbyname((host))
     
117. #endif
     
118. 
     
119. /* The structure returned by recvfrom_flags() */
     
120. struct unp_in_pktinfo {
     
121.     struct in_addr ipi_addr;    /* dst IPv4 address */
     
122.     int     ipi_ifindex;        /* received interface index */
     
123. };
     
124. 
     
125. /* We need the newer CMSG_LEN() and CMSG_SPACE() macros, but few
     
126.    implementations support them today. These two macros really need
     
127.     an ALIGN() macro, but each implementation does this differently. */
     
128. #ifndef CMSG_LEN
     
129. #define CMSG_LEN(size)      (sizeof(struct cmsghdr) + (size))
     
130. #endif
     
131. #ifndef CMSG_SPACE
     
132. #define CMSG_SPACE(size)    (sizeof(struct cmsghdr) + (size))
     
133. #endif
     
134. 
     
135. /* POSIX requires the SUN_LEN() macro, but not all implementations define
     
136.    it (yet). Note that this 4.4BSD macro works regardless whether there is
     
137.    a length field or not. */
     
138. #ifndef SUN_LEN
     
139. # define    SUN_LEN (su) \
     
140.     (sizeof (*(su)) - sizeof ((su)->sun_path) + strlen((su)->sun_path))
     
141. #endif
     
142. 
     
143. /* POSIX renames "Unix domain" as "local IPC."
     
144.    Not all systems define AF_LOCAL and PF_LOCAL (yet). */
     
145. #ifndef AF_LOCAL
     
146. #define AF_LOCAL    AF_UNIX
     
147. #endif
     
148. #ifndef PF_LOCAL
     
149. #define PF_LOCAL    PF_UNIX
     
150. #endif
     
151. 
     
152. /* POSIX requires that an #include of <poll.h> define INFTIM, but many
     
153.    systems still define it in <sys/stropts.h>. We don't want to include
     
154.    all the STREAMS stuff if it's not needed, so we just define INFTIM here.
     
155.    This is the standard value, but there's no guarantee it is -1. */
     
156. #ifndef INFTIM
     
157. #define INFTIM          (-1)     /* infinite poll timeout */
     
158. #ifdef HAVE_POLL_H
     
159. #define INFTIM_UNPH              /* tell unpxti.h we defined it */
     
160. #endif
     
161. #endif
     
162. 
     
163. /* Following could be derived from SOMAXCONN in <sys/socket.h>, but many
     
164.    kernels still #define it as 5, while actually supporting many more */
     
165. #define LISTENQ     1024         /* 2nd argument to listen () */
     
166. 
     
167. /* Miscellaneous constants */
     
168. #define MAXLINE     4096         /* max text line length */
     
169. #define BUFFSIZE    8192         /* buffer size for reads and writes */
     
170. 
     
171. /* Define some port number that can be used for our examples */
     
172. #define SERV_PORT        9877    /* TCP and UDP */
     
173. #define SERV_PORT_STR   "9877"   /* TCP and UDP */
     
174. #define UNIXSTR_PATH    "/tmp/unix.str" /* Unix domain stream */
     
175. #define UNIXDG_PATH     "/tmp/unix.dg"  /* Unix domain datagram */
     
176. 
     
177. /* Following shortens all the typecasts of pointer arguments: */
     
178. #define SA struct sockaddr
     
179. 
     
180. #define HAVE_STRUCT_SOCKADDR_STORAGE
     
181. #ifndef HAVE_STRUCT_SOCKADDR_STORAGE
     
182. /*
     
183. * RFC 3493: protocol-independent placeholder for socket addresses
     
184. */
     
185. #define __SS_MAXSIZE    128
     
186. #define __SS_ALIGNSIZE  (sizeof(int64_t))
     
187. #ifdef HAVE_SOCKADDR_SA_LEN
     
188. #define __SS_PAD1SIZE   (__SS_ALIGNSIZE - sizeof(u_char) - sizeof(sa_family_t))
     
189. #else
     
190. #define __SS_PAD1SIZE   (__SS_ALIGNSIZE - sizeof(sa_family_t))
     
191. #endif
     
192. #define __SS_PAD2SIZE   (__SS_MAXSIZE - 2*__SS_ALIGNSIZE)
     
193. 
     
194. struct sockaddr_storage {
     
195. #ifdef HAVE_SOCKADDR_SA_LEN
     
196.     u_char  ss_len;
     
197. #endif
     
198.     sa_family_t ss_family;
     
199.     char    __ss_pad1[__SS_PAD1SIZE];
     
200.     int64_t __ss_align;
     
201.     char    __ss_pad2[__SS_PAD2SIZE];
     
202. };
     
203. #endif
     
204. 
     
205. #define FILE_MODE   (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
     
206.                     /* default file access permissions for new files */
     
207. #define DIR_MODE    (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)
     
208.                     /* default permissions for new directories */
     
209. 
     
210. typedef void Sigfunc (int);     /* for signal handlers */
     
211. 
     
212. #define min(a,b)    ((a) < (b) ? (a) : (b))
     
213. #define max(a,b)    ((a) > (b) ? (a) : (b))
     
214. 
     
215. #ifndef HAVE_ADDRINFO_STRUCT
     
216. # include   "../lib/addrinfo.h"
     
217. #endif
     
218. 
     
219. #ifndef HAVE_IF_NAMEINDEX_STRUCT
     
220. struct if_nameindex {
     
221.     unsigned int if_index;      /* 1, 2, ... */
     
222.     char *if_name;              /* null-terminated name: "le0", ... */
     
223. };
     
224. #endif
     
225. 
     
226. #ifndef HAVE_TIMESPEC_STRUCT
     
227. struct timespec {
     
228.     time_t tv_sec;              /* seconds */
     
229.     long     tv_nsec;           /* and nanoseconds */
     
230. };
     
231. #endif
     
232. 
     
233. 
     

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