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e465aeed59
Previously this file failed to compile with the following errors:
$ gcc manual/examples/filesrv.c
manual/examples/filesrv.c: In function ‘main’:
manual/examples/filesrv.c:37:3: error: implicit declaration of function ‘unlink’ [-Wimplicit-function-declaration]
37 | unlink (SERVER);
| ^~~~~~
manual/examples/filesrv.c:40:10: error: implicit declaration of function ‘make_named_socket’ [-Wimplicit-function-declaration]
40 | sock = make_named_socket (SERVER);
| ^~~~~~~~~~~~~~~~~
manual/examples/filesrv.c:46:54: error: passing argument 6 of ‘recvfrom’ from incompatible pointer type [-Wincompatible-pointer-types]
46 | (struct sockaddr *) & name, &size);
| ^~~~~
| |
| size_t * {aka long unsigned int *}
In file included from manual/examples/filesrv.c:21:
/usr/include/sys/socket.h:165:48: note: expected ‘socklen_t * restrict’ {aka ‘unsigned int * restrict’} but argument is of type ‘size_t *’ {aka ‘long unsigned int *’}
165 | socklen_t *__restrict __addr_len);
| ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
This patch fixes the missing declaration for unlink and uses
'socklen_t *' for the fourth argument of recv from. The
make_named_socket function is defined in the manual.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* Datagram Socket Example
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Copyright (C) 1991-2025 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#define SERVER "/tmp/serversocket"
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#define MAXMSG 512
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int
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main (void)
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{
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int sock;
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char message[MAXMSG];
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struct sockaddr_un name;
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socklen_t size;
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int nbytes;
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/* Remove the filename first, it's ok if the call fails */
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unlink (SERVER);
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/* Make the socket, then loop endlessly. */
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sock = make_named_socket (SERVER);
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while (1)
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{
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/* Wait for a datagram. */
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size = sizeof (name);
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nbytes = recvfrom (sock, message, MAXMSG, 0,
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(struct sockaddr *) & name, &size);
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if (nbytes < 0)
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{
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perror ("recfrom (server)");
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exit (EXIT_FAILURE);
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}
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/* Give a diagnostic message. */
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fprintf (stderr, "Server: got message: %s\n", message);
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/* Bounce the message back to the sender. */
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nbytes = sendto (sock, message, nbytes, 0,
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(struct sockaddr *) & name, size);
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if (nbytes < 0)
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{
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perror ("sendto (server)");
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exit (EXIT_FAILURE);
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}
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}
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}
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