socket/sys/socket.h

   1 /* Declarations of socket constants, types, and functions.
   2    Copyright (C) 1991, 92, 94, 95, 96 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_SOCKET_H
  21
  22 #define _SYS_SOCKET_H   1
  23 #include <features.h>
  24
  25 __BEGIN_DECLS
  26
  27 #define __need_size_t
  28 #include <stddef.h>
  29
  30
  31 /* This operating system-specific header file defines the SOCK_*, PF_*,
  32    AF_*, MSG_*, SOL_*, and SO_* constants, and the `struct sockaddr',
  33    `struct msghdr', and `struct linger' types.  */
  34 #include <socketbits.h>
  35
  36 #ifdef __USE_BSD
  37 /* This is the 4.3 BSD `struct sockaddr' format, which is used as wire
  38    format in the grotty old 4.3 `talk' protocol.  */
  39 struct osockaddr
  40   {
  41     unsigned short int sa_family;
  42     unsigned char sa_data[14];
  43   };
  44 #endif
  45
  46 /* This is the type we use for generic socket address arguments.
  47
  48    With GCC 2.7 and later, the funky union causes redeclarations or
  49    uses with any of the listed types to be allowed without complaint.
  50    G++ 2.7 does not support transparent unions so there we want the
  51    old-style declaration, too.  */
  52 #if     (!defined (__GNUC__) || __GNUC__ < 2 || defined(__cplusplus) || \
  53          (__GNUC__ == 2 && __GNUC_MINOR__ < 7))
  54 #define __SOCKADDR_ARG          struct sockaddr *
  55 #define __CONST_SOCKADDR_ARG    __const struct sockaddr *
  56 #else
  57 /* Add more `struct sockaddr_AF' types here as necessary.
  58    These are all the ones I found on NetBSD and Linux.  */
  59 #define __SOCKADDR_ALLTYPES \
  60   __SOCKADDR_ONETYPE (sockaddr) \
  61   __SOCKADDR_ONETYPE (sockaddr_at) \
  62   __SOCKADDR_ONETYPE (sockaddr_ax25) \
  63   __SOCKADDR_ONETYPE (sockaddr_dl) \
  64   __SOCKADDR_ONETYPE (sockaddr_eon) \
  65   __SOCKADDR_ONETYPE (sockaddr_in) \
  66   __SOCKADDR_ONETYPE (sockaddr_in6) \
  67   __SOCKADDR_ONETYPE (sockaddr_inarp) \
  68   __SOCKADDR_ONETYPE (sockaddr_ipx) \
  69   __SOCKADDR_ONETYPE (sockaddr_iso) \
  70   __SOCKADDR_ONETYPE (sockaddr_ns) \
  71   __SOCKADDR_ONETYPE (sockaddr_un) \
  72   __SOCKADDR_ONETYPE (sockaddr_x25)
  73
  74 #define __SOCKADDR_ONETYPE(type) struct type *__##type##__;
  75 typedef union { __SOCKADDR_ALLTYPES
  76               } __SOCKADDR_ARG __attribute__ ((__transparent_union__));
  77 #undef __SOCKADDR_ONETYPE
  78 #define __SOCKADDR_ONETYPE(type) __const struct type *__##type##__;
  79 typedef union { __SOCKADDR_ALLTYPES
  80               } __CONST_SOCKADDR_ARG __attribute__ ((__transparent_union__));
  81 #undef __SOCKADDR_ONETYPE
  82 #endif
  83
  84
  85 /* Create a new socket of type TYPE in domain DOMAIN, using
  86    protocol PROTOCOL.  If PROTOCOL is zero, one is chosen automatically.
  87    Returns a file descriptor for the new socket, or -1 for errors.  */
  88 extern int socket __P ((int __domain, int __type, int __protocol));
  89
  90 /* Create two new sockets, of type TYPE in domain DOMAIN and using
  91    protocol PROTOCOL, which are connected to each other, and put file
  92    descriptors for them in FDS[0] and FDS[1].  If PROTOCOL is zero,
  93    one will be chosen automatically.  Returns 0 on success, -1 for errors.  */
  94 extern int socketpair __P ((int __domain, int __type, int __protocol,
  95                             int __fds[2]));
  96
  97 /* Give the socket FD the local address ADDR (which is LEN bytes long).  */
  98 extern int bind __P ((int __fd, __CONST_SOCKADDR_ARG __addr, size_t __len));
  99
 100 /* Put the local address of FD into *ADDR and its length in *LEN.  */
 101 extern int getsockname __P ((int __fd, __SOCKADDR_ARG __addr,
 102                              size_t *__len));
 103
 104 /* Open a connection on socket FD to peer at ADDR (which LEN bytes long).
 105    For connectionless socket types, just set the default address to send to
 106    and the only address from which to accept transmissions.
 107    Return 0 on success, -1 for errors.  */
 108 extern int __connect __P ((int __fd,
 109                            __CONST_SOCKADDR_ARG __addr, size_t __len));
 110 extern int connect __P ((int __fd,
 111                          __CONST_SOCKADDR_ARG __addr, size_t __len));
 112
 113 /* Put the address of the peer connected to socket FD into *ADDR
 114    (which is *LEN bytes long), and its actual length into *LEN.  */
 115 extern int getpeername __P ((int __fd, __SOCKADDR_ARG __addr,
 116                              size_t *__len));
 117
 118
 119 /* Send N bytes of BUF to socket FD.  Returns the number sent or -1.  */
 120 extern int __send __P ((int __fd, __const __ptr_t __buf, size_t __n,
 121                         int __flags));
 122 extern int send __P ((int __fd, __const __ptr_t __buf, size_t __n,
 123                       int __flags));
 124
 125 /* Read N bytes into BUF from socket FD.
 126    Returns the number read or -1 for errors.  */
 127 extern int recv __P ((int __fd, __ptr_t __buf, size_t __n, int __flags));
 128
 129 /* Send N bytes of BUF on socket FD to peer at address ADDR (which is
 130    ADDR_LEN bytes long).  Returns the number sent, or -1 for errors.  */
 131 extern int sendto __P ((int __fd, __const __ptr_t __buf, size_t __n,
 132                         int __flags, __CONST_SOCKADDR_ARG __addr,
 133                         size_t __addr_len));
 134
 135 /* Read N bytes into BUF through socket FD.
 136    If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
 137    the sender, and store the actual size of the address in *ADDR_LEN.
 138    Returns the number of bytes read or -1 for errors.  */
 139 extern int recvfrom __P ((int __fd, __ptr_t __buf, size_t __n, int __flags,
 140                           __SOCKADDR_ARG __addr, size_t *__addr_len));
 141
 142
 143 /* Send a message described MESSAGE on socket FD.
 144    Returns the number of bytes sent, or -1 for errors.  */
 145 extern int sendmsg __P ((int __fd, __const struct msghdr *__message,
 146                          int __flags));
 147
 148 /* Receive a message as described by MESSAGE from socket FD.
 149    Returns the number of bytes read or -1 for errors.  */
 150 extern int recvmsg __P ((int __fd, struct msghdr *__message, int __flags));
 151
 152
 153 /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
 154    into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's
 155    actual length.  Returns 0 on success, -1 for errors.  */
 156 extern int getsockopt __P ((int __fd, int __level, int __optname,
 157                             __ptr_t __optval, size_t *__optlen));
 158
 159 /* Set socket FD's option OPTNAME at protocol level LEVEL
 160    to *OPTVAL (which is OPTLEN bytes long).
 161    Returns 0 on success, -1 for errors.  */
 162 extern int setsockopt __P ((int __fd, int __level, int __optname,
 163                             __ptr_t __optval, size_t __optlen));
 164
 165
 166 /* Prepare to accept connections on socket FD.
 167    N connection requests will be queued before further requests are refused.
 168    Returns 0 on success, -1 for errors.  */
 169 extern int listen __P ((int __fd, unsigned int __n));
 170
 171 /* Await a connection on socket FD.
 172    When a connection arrives, open a new socket to communicate with it,
 173    set *ADDR (which is *ADDR_LEN bytes long) to the address of the connecting
 174    peer and *ADDR_LEN to the address's actual length, and return the
 175    new socket's descriptor, or -1 for errors.  */
 176 extern int accept __P ((int __fd, __SOCKADDR_ARG __addr,
 177                         size_t *__addr_len));
 178
 179 /* Shut down all or part of the connection open on socket FD.
 180    HOW determines what to shut down:
 181      0 = No more receptions;
 182      1 = No more transmissions;
 183      2 = No more receptions or transmissions.
 184    Returns 0 on success, -1 for errors.  */
 185 extern int shutdown __P ((int __fd, int __how));
 186
 187
 188 /* FDTYPE is S_IFSOCK or another S_IF* macro defined in <sys/stat.h>;
 189    returns 1 if FD is open on an object of the indicated type, 0 if not,
 190    or -1 for errors (setting errno).  */
 191 extern int isfdtype __P ((int __fd, int __fdtype));
 192
 193 __END_DECLS
 194
 195 #endif /* sys/socket.h */