1/* Copyright (C) 1994-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <sys/socket.h>
20#include <hurd.h>
21#include <hurd/fd.h>
22#include <hurd/socket.h>
23#include <string.h>
24#include <sysdep-cancel.h>
25
26/* Read N bytes into BUF from socket FD.
27 Returns the number read or -1 for errors. */
28
29ssize_t
30__recv (int fd, void *buf, size_t n, int flags)
31{
32 error_t err;
33 mach_port_t addrport;
34 char *bufp = buf;
35 mach_msg_type_number_t nread = n;
36 mach_port_t *ports;
37 mach_msg_type_number_t nports = 0;
38 char *cdata = NULL;
39 mach_msg_type_number_t clen = 0;
40 int cancel_oldtype;
41
42 cancel_oldtype = LIBC_CANCEL_ASYNC();
43 err = HURD_DPORT_USE_CANCEL (fd, __socket_recv (port, &addrport,
44 flags, &bufp, &nread,
45 &ports, &nports,
46 &cdata, &clen,
47 &flags,
48 n));
49 LIBC_CANCEL_RESET (cancel_oldtype);
50
51 if (err == MIG_BAD_ID || err == EOPNOTSUPP)
52 /* The file did not grok the socket protocol. */
53 err = ENOTSOCK;
54 if (err)
55 return __hurd_sockfail (fd, flags, err);
56
57 __mach_port_deallocate (__mach_task_self (), addrport);
58 __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
59
60 if (bufp != buf)
61 {
62 memcpy (buf, bufp, nread);
63 __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
64 }
65
66 return nread;
67}
68libc_hidden_def (__recv)
69weak_alias (__recv, recv)
70

source code of glibc/sysdeps/mach/hurd/recv.c