D.2 config.h Header

The GNU autoconf tool was used to aid in the portability of all the source code in this text. It is available from http://ftp.gnu.org/gnu/autoconf. This tool generates a shell script named configure that you must run after downloading the software onto your system. This script determines the features provided by your Unix system: Do socket address structures have a length field? Is multicasting supported? Are datalink socket address structures supported? and so on, generating a header named config.h. This header is the first header included by our unp.h header in the previous section. Figure D.2 shows the config.h header for FreeBSD 5.1.

The lines beginning with #define in column 1 are for features that the system provides. The lines that are commented out and contain #undef are features that the system does not provide.

Figure D.2 Our config.h header for FreeBSD 5.1.

sparc64-unknown-freebsd5.1/config.h

  1 /* config.h. Generated automatically by configure. */
  2 /* config.h.in. Generated automatically from configure.in by autoheader. */

  3 /* CPU, vendor, and operating system */
  4 #define CPU_VENDOR_OS "sparc64-unknown-freebsd5.1"

  5 /* Define if <netdb.h> defines struct addrinfo */
  6 #define HAVE_ADDRINFO_STRUCT 1

  7 /* Define if you have the <arpa/inet.h> header file. */
  8 #define HAVE_ARPA_INET_H 1

  9 /* Define if you have the bzero function. */
 10 #define HAVE_BZERO 1

 11 /* Define if the /dev/streams/xtiso/tcp device exists */
 12 /* #undef HAVE_DEV_STREAMS_XTISO_TCP */

 13 /* Define if the /dev/tcp device exists */
 14 /* #undef HAVE_DEV_TCP */

 15 /* Define if the /dev/xti/tcp device exists */
 16 /* #undef HAVE_DEV_XTI_TCP */

 17 /* Define if you have the <errno.h> header file. */
 18 #define HAVE_ERRNO_H 1

 19 /* Define if you have the <fcntl.h> header file. */
 20 #define HAVE_FCNTL_H 1

 21 /* Define if you have the getaddrinfo function. */
 22 #define HAVE_GETADDRINFO 1

 23 /* define if getaddrinfo prototype is in <netdb.h> */
 24 #define HAVE_GETADDRINFO_PROTO 1

 25 /* Define if you have the gethostbyname2 function. */
 26 #define HAVE_GETHOSTBYNAME2 1

 27 /* Define if you have the gethostbyname_r function. */
 28 /* #undef HAVE_GETHOSTBYNAME_R */

 29 /* Define if you have the gethostname function. */
 30 #define HAVE_GETHOSTNAME 1

 31 /* define if gethostname prototype is in <unistd.h> */
 32 #define HAVE_GETHOSTNAME_PROTO 1

 33 /* Define if you have the getnameinfo function. */
 34 #define HAVE_GETNAMEINFO 1

 35 /* define if getnameinfo prototype is in <netdb.h> */
 36 #define HAVE_GETNAMEINFO_PROTO 1

 37 /* define if getrusage prototype is in <sys/resource.h> */
 38 #define HAVE_GETRUSAGE_PROTO 1

 39 /* Define if you have the hstrerror function. */
 40 #define HAVE_HSTRERROR 1

 41 /* define if hstrerror prototype is in <netdb.h> */
 42 #define HAVE_HSTRERROR_PROTO 1

 43 /* Define if <net/if.h> defines struct if_nameindex */
 44 #define HAVE_IF_NAMEINDEX_STRUCT 1

 45 /* Define if you have the if_nametoindex function. */
 46 #define HAVE_IF_NAMETOINDEX 1

 47 /* define if if_nametoindex prototype is in <net/if.h> */
 48 #define HAVE_IF_NAMETOINDEX_PROTO 1

 49 /* Define if you have the inet_aton function. */
 50 #define HAVE_INET_ATON 1

 51 /* define if inet_aton prototype is in <arpa/inet.h> */
 52 #define HAVE_INET_ATON_PROTO 1

 53 /* Define if you have the inet_pton function. */
 54 #define HAVE_INET_PTON 1

 55 /* define if inet_pton prototype is in <arpa/inet.h> */
 56 #define HAVE_INET_PTON_PROTO 1

 57 /* Define if you have the kevent function. */
 58 #define HAVE_KEVENT 1

 59 /* Define if you have the kqueue function. */
 60 #define HAVE_KQUEUE 1

 61 /* Define if you have the nsl library (-lnsl). */
 62 /* #undef HAVE_LIBNSL */

 63 /* Define if you have the pthread library (-lpthread). */
 64 /* #undef HAVE_LIBPTHREAD */

 65 /* Define if you have the pthreads library (-lpthreads). */
 66 /* #undef HAVE_LIBPTHREADS */

 67 /* Define if you have the resolv library (-lresolv). */
 68 /* #undef HAVE_LIBRESOLV */

 69 /* Define if you have the xti library (-lxti). */
 70 /* #undef HAVE_LIBXTI */

 71 /* Define if you have the mkstemp function. */
 72 #define HAVE_MKSTEMP 1

 73 /* define if struct msghdr contains the msg_control element */
 74 #define HAVE_MSGHDR_MSG_CONTROL 1

 75 /* Define if you have the <netconfig.h> header file. */
 76 #define HAVE_NETCONFIG_H 1

 77 /* Define if you have the <netdb.h> header file. */
 78 #define HAVE_NETDB_H 1

 79 /* Define if you have the <netdir.h> header file. */
 80 /* #undef HAVE_NETDIR_H */

 81 /* Define if you have the <netinet/in.h> header file. */
 82 #define HAVE_NETINET_IN_H 1

 83 /* Define if you have the <net/if_dl.h> header file. */
 84 #define HAVE_NET_IF_DL_H 1

 85 /* Define if you have the poll function. */
 86 #define HAVE_POLL 1

 87 /* Define if you have the <poll.h> header file. */
 88 #define HAVE_POLL_H 1

 89 /* Define if you have the pselect function. */
 90 #define HAVE_PSELECT 1

 91 /* define if pselect prototype is in <sys/stat.h> */
 92 #define HAVE_PSELECT_PROTO 1

 93 /* Define if you have the <pthread.h> header file. */
 94 #define HAVE_PTHREAD_H 1

 95 /* Define if you have the <signal.h> header file. */
 96 #define HAVE_SIGNAL_H 1

 97 /* Define if you have the snprintf function. */
 98 #define HAVE_SNPRINTF 1

 99 /* define if snprintf prototype is in <stdio.h> */
100 #define HAVE_SNPRINTF_PROTO 1

101 /* Define if <net/if_dl.h> defines struct sockaddr_dl */
102 #define HAVE_SOCKADDR_DL_STRUCT 1

103 /* define if socket address structures have length fields */
104 #define HAVE_SOCKADDR_SA_LEN 1

105 /* Define if you have the sockatmark function. */
106 #define HAVE_SOCKATMARK 1

107 /* define if sockatmark prototype is in <sys/socket.h> */
108 #define HAVE_SOCKATMARK_PROTO 1

109 /* Define if you have the <stdio.h> header file. */
110 #define HAVE_STDIO_H 1

111 /* Define if you have the <stdlib.h> header file. */
112 #define HAVE_STDLIB_H 1

113 /* Define if you have the <strings.h> header file. */
114 #define HAVE_STRINGS_H 1

115 /* Define if you have the <string.h> header file. */
116 #define HAVE_STRING_H 1

117 /* Define if you have the <stropts.h> header file. */
118 /* #undef HAVE_STROPTS_H */

119 /* Define if ifr_mtu is member of struct ifreq. */
120 #define HAVE_STRUCT_IFREQ_IFR_MTU 1

121 /* Define if the system has the type struct sockaddr_storage. */
122 #define HAVE_STRUCT_SOCKADDR_STORAGE 1

123 /* Define if you have the <sys/event.h> header file. */
124 #define HAVE_SYS_EVENT_H 1

125 /* Define if you have the <sys/filio.h> header file. */
126 #define HAVE_SYS_FILIO_H 1

127 /* Define if you have the <sys/ioctl.h> header file. */
128 #define HAVE_SYS_IOCTL_H 1

129 /* Define if you have the <sys/select.h> header file. */
130 #define HAVE_SYS_SELECT_H 1

131 /* Define if you have the <sys/socket.h> header file. */
132 #define HAVE_SYS_SOCKET_H 1

133 /* Define if you have the <sys/sockio.h> header file. */
134 #define HAVE_SYS_SOCKIO_H 1

135 /* Define if you have the <sys/stat.h> header file. */
136 #define HAVE_SYS_STAT_H 1

137 /* Define if you have the <sys/sysctl.h> header file. */
138 #define HAVE_SYS_SYSCTL_H 1

139 /* Define if you have the <sys/time.h> header file. */
140 #define HAVE_SYS_TIME_H 1

141 /* Define if you have the <sys/types.h> header file. */
142 #define HAVE_SYS_TYPES_H 1

143 /* Define if you have the <sys/uio.h> header file. */
144 #define HAVE_SYS_UIO_H 1

145 /* Define if you have the <sys/un.h> header file. */
146 #define HAVE_SYS_UN_H 1

147 /* Define if you have the <sys/wait.h> header file. */
148 #define HAVE_SYS_WAIT_H 1

149 /* Define if <time.h> defines struct timespec */
150 #define HAVE_TIMESPEC_STRUCT 1

151 /* Define if you have the <time.h> header file. */
152 #define HAVE_TIME_H 1

153 /* Define if you have the <unistd.h> header file. */
154 #define HAVE_UNISTD_H 1

155 /* Define if you have the vsnprintf function. */
156 #define HAVE_VSNPRINTF 1

157 /* Define if you have the <xti.h> header file. */
158 /* #undef HAVE_XTI_H */

159 /* Define if you have the <xti_inet.h> header file. */
160 /* #undef HAVE_XTI_INET_H */

161 /* Define if the system supports IPv4 */
162 #define IPV4 1

163 /* Define if the system supports IPv6 */
164 #define IPV6 1

165 /* Define if the system supports IPv4 */
166 #define IPv4 1

167 /* Define if the system supports IPv6 */
168 #define IPv6 1

169 /* Define if the system supports IP Multicast */
170 #define MCAST 1

171 /* the size of the sa_family field in a socket address structure */
172 /* #undef SA_FAMILY_T */

173 /* Define if you have the ANSI C header files. */
174 #define STDC_HEADERS 1

175 /* Define if you can safely include both <sys/time.h> and <time.h>. */
176 #define TIME_WITH_SYS_TIME 1

177 /* Define if the system supports UNIX domain sockets */
178 #define UNIXDOMAIN 1

179 /* Define if the system supports UNIX domain sockets */
180 #define UNIXdomain 1

181 /* 16 bit signed type */
182 /* #undef int16_t */

183 /* 32 bit signed type */
184 /* #undef int32_t */

185 /* the type of the sa_family struct element */
186 /* #undef sa_family_t */

187 /* unsigned integer type of the result of the sizeof operator */
188 /* #undef size_t */

189 /* a type appropriate for address */
190 /* #undef socklen_t */

191 /* define to __ss_family if sockaddr_storage has that instead of ss_family */
192 /* #undef ss_family */

193 /* a signed type appropriate for a count of bytes or an error indication */
194 /* #undef ssize_t */

195 /* scalar type */
196 #define t_scalar_t int32_t

197 /* unsigned scalar type */
198 #define t_uscalar_t uint32_t

199 /* 16 bit unsigned type */
200 /* #undef uint16_t */

201 /* 32 bit unsigned type */
202 /* #undef uint32_t */

203         /* -bit unsigned type */
204 /* #undef uint8_t */