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/* Copyright (C) 1994-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <hurd/socket.h>
#include <sysdep-cancel.h>
/* Read N bytes into BUF through socket FD.
If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
the sender, and store the actual size of the address in *ADDR_LEN.
Returns the number of bytes read or -1 for errors. */
ssize_t
__recvfrom (int fd, void *buf, size_t n, int flags, __SOCKADDR_ARG addrarg,
socklen_t *addr_len)
{
error_t err;
mach_port_t addrport;
char *bufp = buf;
mach_msg_type_number_t nread = n;
mach_port_t *ports;
mach_msg_type_number_t nports = 0;
char *cdata = NULL;
mach_msg_type_number_t clen = 0;
struct sockaddr *addr = addrarg.__sockaddr__;
int cancel_oldtype;
cancel_oldtype = LIBC_CANCEL_ASYNC();
err = HURD_DPORT_USE_CANCEL (fd, __socket_recv (port, &addrport,
flags, &bufp, &nread,
&ports, &nports,
&cdata, &clen,
&flags,
n));
LIBC_CANCEL_RESET (cancel_oldtype);
if (err)
return __hurd_sockfail (fd, flags, err);
/* Get address data for the returned address port if requested. */
if (addr != NULL && addrport != MACH_PORT_NULL)
{
char *buf = (char *) addr;
mach_msg_type_number_t buflen = *addr_len;
int type;
cancel_oldtype = LIBC_CANCEL_ASYNC();
err = __socket_whatis_address (addrport, &type, &buf, &buflen);
LIBC_CANCEL_RESET (cancel_oldtype);
if (err == EOPNOTSUPP)
/* If the protocol server can't tell us the address, just return a
zero-length one. */
{
buf = (char *)addr;
buflen = 0;
err = 0;
}
if (err)
{
__mach_port_deallocate (__mach_task_self (), addrport);
return __hurd_sockfail (fd, flags, err);
}
if (*addr_len > buflen)
*addr_len = buflen;
if (buf != (char *) addr)
{
memcpy (addr, buf, *addr_len);
__vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
}
if (buflen > 0)
addr->sa_family = type;
}
else if (addr_len != NULL)
*addr_len = 0;
__mach_port_deallocate (__mach_task_self (), addrport);
/* Toss control data; we don't care. */
__vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
if (bufp != buf)
{
memcpy (buf, bufp, nread);
__vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
}
return nread;
}
weak_alias (__recvfrom, recvfrom)
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