1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 2003-2007, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 2, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, *
20 * Boston, MA 02110-1301, USA. *
22 * As a special exception, if you link this file with other files to *
23 * produce an executable, this file does not by itself cause the resulting *
24 * executable to be covered by the GNU General Public License. This except- *
25 * ion does not however invalidate any other reasons why the executable *
26 * file might be covered by the GNU Public License. *
28 * GNAT was originally developed by the GNAT team at New York University. *
29 * Extensive contributions were provided by Ada Core Technologies Inc. *
31 ****************************************************************************/
33 /* This file provides a portable binding to the sockets API */
36 /* Include all the necessary system-specific headers and define the
37 necessary macros (shared with gen-soccon). */
39 #if !defined(SO_NOSIGPIPE) && !defined (MSG_NOSIGNAL)
42 /* Required if we will be calling signal() in __gnat_disable_all_sigpipes() */
45 /* Required for __gnat_malloc() */
48 /* Required for memcpy() */
50 extern void __gnat_disable_sigpipe (int fd);
51 extern void __gnat_disable_all_sigpipes (void);
52 extern int __gnat_create_signalling_fds (int *fds);
53 extern int __gnat_read_signalling_fd (int rsig);
54 extern int __gnat_write_signalling_fd (int wsig);
55 extern void __gnat_close_signalling_fd (int sig);
56 extern void __gnat_free_socket_set (fd_set *);
57 extern void __gnat_last_socket_in_set (fd_set *, int *);
58 extern void __gnat_get_socket_from_set (fd_set *, int *, int *);
59 extern void __gnat_insert_socket_in_set (fd_set *, int);
60 extern int __gnat_is_socket_in_set (fd_set *, int);
61 extern fd_set *__gnat_new_socket_set (fd_set *);
62 extern void __gnat_remove_socket_from_set (fd_set *, int);
63 extern int __gnat_get_h_errno (void);
65 /* Disable the sending of SIGPIPE for writes on a broken stream */
68 __gnat_disable_sigpipe (int fd)
72 (void) setsockopt (fd, SOL_SOCKET, SO_NOSIGPIPE, &val, sizeof val);
77 __gnat_disable_all_sigpipes (void)
79 #if !defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL) && defined(SIGPIPE)
80 (void) signal (SIGPIPE, SIG_IGN);
84 #if defined (_WIN32) || defined (__vxworks) || defined (VMS)
86 * Signalling FDs operations are implemented in Ada for these platforms
87 * (see subunit GNAT.Sockets.Thin.Signalling_Fds).
91 * Create a pair of connected file descriptors fds[0] and fds[1] used for
92 * signalling by a Selector object. fds[0] is the read end, and fds[1] the
96 __gnat_create_signalling_fds (int *fds) {
101 * Read one byte of data from rsig, the read end of a pair of signalling fds
102 * created by __gnat_create_signalling_fds.
105 __gnat_read_signalling_fd (int rsig) {
107 return read (rsig, &c, 1);
111 * Write one byte of data to wsig, the write end of a pair of signalling fds
112 * created by __gnat_create_signalling_fds.
115 __gnat_write_signalling_fd (int wsig) {
117 return write (wsig, &c, 1);
121 * Close one end of a pair of signalling fds
124 __gnat_close_signalling_fd (int sig) {
130 * GetXXXbyYYY wrappers
131 * These functions are used by the default implementation of g-socthi,
132 * and also by the Windows version.
134 * They can be used for any platform that either provides an intrinsically
135 * task safe implementation of getXXXbyYYY, or a reentrant variant
136 * getXXXbyYYY_r. Otherwise, a task safe wrapper, including proper mutual
137 * exclusion if appropriate, must be implemented in the target specific
138 * version of g-socthi.
141 #ifdef HAVE_THREAD_SAFE_GETxxxBYyyy
143 __gnat_safe_gethostbyname (const char *name,
144 struct hostent *ret, char *buf, size_t buflen,
148 rh = gethostbyname (name);
159 __gnat_safe_gethostbyaddr (const char *addr, int len, int type,
160 struct hostent *ret, char *buf, size_t buflen,
164 rh = gethostbyaddr (addr, len, type);
175 __gnat_safe_getservbyname (const char *name, const char *proto,
176 struct servent *ret, char *buf, size_t buflen)
179 rh = getservbyname (name, proto);
187 __gnat_safe_getservbyport (int port, const char *proto,
188 struct servent *ret, char *buf, size_t buflen)
191 rh = getservbyport (port, proto);
197 #elif HAVE_GETxxxBYyyy_R
199 __gnat_safe_gethostbyname (const char *name,
200 struct hostent *ret, char *buf, size_t buflen,
207 (void) gethostbyname_r (name, ret, buf, buflen, &rh, h_errnop);
209 rh = gethostbyname_r (name, ret, buf, buflen, h_errnop);
211 ri = (rh == NULL) ? -1 : 0;
216 __gnat_safe_gethostbyaddr (const char *addr, int len, int type,
217 struct hostent *ret, char *buf, size_t buflen,
224 (void) gethostbyaddr_r (addr, len, type, ret, buf, buflen, &rh, h_errnop);
226 rh = gethostbyaddr_r (addr, len, type, ret, buf, buflen, h_errnop);
228 ri = (rh == NULL) ? -1 : 0;
233 __gnat_safe_getservbyname (const char *name, const char *proto,
234 struct servent *ret, char *buf, size_t buflen)
240 (void) getservbyname_r (name, proto, ret, buf, buflen, &rh);
242 rh = getservbyname_r (name, proto, ret, buf, buflen);
244 ri = (rh == NULL) ? -1 : 0;
249 __gnat_safe_getservbyport (int port, const char *proto,
250 struct servent *ret, char *buf, size_t buflen)
256 (void) getservbyport_r (port, proto, ret, buf, buflen, &rh);
258 rh = getservbyport_r (port, proto, ret, buf, buflen);
260 ri = (rh == NULL) ? -1 : 0;
265 /* Free socket set. */
268 __gnat_free_socket_set (fd_set *set)
273 /* Find the largest socket in the socket set SET. This is needed for
274 `select'. LAST is the maximum value for the largest socket. This hint is
275 used to avoid scanning very large socket sets. On return, LAST is the
276 actual largest socket in the socket set. */
279 __gnat_last_socket_in_set (fd_set *set, int *last)
286 /* More efficient method for NT. */
287 for (s = 0; s < set->fd_count; s++)
288 if ((int) set->fd_array[s] > l)
289 l = set->fd_array[s];
293 for (s = *last; s != -1; s--)
294 if (FD_ISSET (s, set))
304 /* Get last socket and remove it from the socket set SET. LAST is the
305 maximum value of the largest socket. This hint is used to avoid scanning
306 very large socket sets. On return, LAST is set to the actual largest
307 socket in the socket set. */
310 __gnat_get_socket_from_set (fd_set *set, int *last, int *socket)
313 FD_CLR (*socket, set);
314 __gnat_last_socket_in_set (set, last);
317 /* Insert SOCKET in the socket set SET. */
320 __gnat_insert_socket_in_set (fd_set *set, int socket)
322 FD_SET (socket, set);
325 /* Check whether a given SOCKET is in the socket set SET. */
328 __gnat_is_socket_in_set (fd_set *set, int socket)
330 return FD_ISSET (socket, set);
333 /* Allocate a new socket set and set it as empty. */
336 __gnat_new_socket_set (fd_set *set)
340 new = (fd_set *) __gnat_malloc (sizeof (fd_set));
343 memcpy (new, set, sizeof (fd_set));
350 /* Remove SOCKET from the socket set SET. */
353 __gnat_remove_socket_from_set (fd_set *set, int socket)
355 FD_CLR (socket, set);
358 /* Get the value of the last host error */
361 __gnat_get_h_errno (void) {
363 int vxw_errno = errno;
369 case S_resolvLib_HOST_NOT_FOUND:
370 case S_hostLib_UNKNOWN_HOST:
371 return HOST_NOT_FOUND;
373 case S_resolvLib_TRY_AGAIN:
376 case S_resolvLib_NO_RECOVERY:
377 case S_resolvLib_BUFFER_2_SMALL:
378 case S_resolvLib_INVALID_PARAMETER:
379 case S_resolvLib_INVALID_ADDRESS:
380 case S_hostLib_INVALID_PARAMETER:
383 case S_resolvLib_NO_DATA:
391 /* h_errno is defined as follows in OpenVMS' version of <netdb.h>.
392 * However this header file is not available when building the GNAT
393 * runtime library using GCC, so we are hardcoding the definition
394 * directly. Note that the returned address is thread-specific.
396 extern int *decc$h_errno_get_addr ();
397 return *decc$h_errno_get_addr ();
399 #elif defined (__rtems__)
400 /* At this stage in the tool build, no networking .h files are available.
401 * Newlib does not provide networking .h files and RTEMS is not built yet.
402 * So we need to explicitly extern h_errno to access it.