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113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* Copyright (C) 1994-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <hurd.h>
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#include <hurd/fd.h>
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#include <hurd/socket.h>
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#include <sysdep-cancel.h>
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/* Read N bytes into BUF through socket FD.
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If ADDR is not NULL, fill in *ADDR_LEN bytes of it with the address of
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the sender, and store the actual size of the address in *ADDR_LEN.
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Returns the number of bytes read or -1 for errors. */
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ssize_t
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__recvfrom (int fd, void *buf, size_t n, int flags, __SOCKADDR_ARG addrarg,
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socklen_t *addr_len)
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{
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error_t err;
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mach_port_t addrport;
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char *bufp = buf;
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mach_msg_type_number_t nread = n;
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mach_port_t *ports;
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mach_msg_type_number_t nports = 0;
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char *cdata = NULL;
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mach_msg_type_number_t clen = 0;
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struct sockaddr *addr = addrarg.__sockaddr__;
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int cancel_oldtype;
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cancel_oldtype = LIBC_CANCEL_ASYNC();
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err = HURD_DPORT_USE_CANCEL (fd, __socket_recv (port, &addrport,
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flags, &bufp, &nread,
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&ports, &nports,
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&cdata, &clen,
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&flags,
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n));
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LIBC_CANCEL_RESET (cancel_oldtype);
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if (err)
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return __hurd_sockfail (fd, flags, err);
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/* Get address data for the returned address port if requested. */
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if (addr != NULL && addrport != MACH_PORT_NULL)
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{
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char *buf = (char *) addr;
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mach_msg_type_number_t buflen = *addr_len;
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int type;
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cancel_oldtype = LIBC_CANCEL_ASYNC();
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err = __socket_whatis_address (addrport, &type, &buf, &buflen);
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LIBC_CANCEL_RESET (cancel_oldtype);
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if (err == EOPNOTSUPP)
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/* If the protocol server can't tell us the address, just return a
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zero-length one. */
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{
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buf = (char *)addr;
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buflen = 0;
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err = 0;
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}
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if (err)
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{
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__mach_port_deallocate (__mach_task_self (), addrport);
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return __hurd_sockfail (fd, flags, err);
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}
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if (*addr_len > buflen)
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*addr_len = buflen;
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if (buf != (char *) addr)
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{
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memcpy (addr, buf, *addr_len);
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__vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
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}
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if (buflen > 0)
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addr->sa_family = type;
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}
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else if (addr_len != NULL)
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*addr_len = 0;
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if (MACH_PORT_VALID (addrport))
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__mach_port_deallocate (__mach_task_self (), addrport);
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/* Toss control data; we don't care. */
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__vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
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if (bufp != buf)
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{
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memcpy (buf, bufp, nread);
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__vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
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}
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return nread;
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}
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weak_alias (__recvfrom, recvfrom)
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