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2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
253 lines
6.8 KiB
C
253 lines
6.8 KiB
C
/* Copyright (C) 2001-2021 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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; see the file COPYING.LIB. If
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not, see <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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/* Receive a message as described by MESSAGE from socket FD.
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Returns the number of bytes read or -1 for errors. */
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ssize_t
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__libc_recvmsg (int fd, struct msghdr *message, int flags)
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{
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error_t err;
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addr_port_t aport;
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char *data = NULL;
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mach_msg_type_number_t len = 0;
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mach_port_t *ports, *newports = NULL;
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mach_msg_type_number_t nports = 0;
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struct cmsghdr *cmsg;
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char *cdata = NULL;
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mach_msg_type_number_t clen = 0;
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size_t amount;
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char *buf;
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int nfds, *opened_fds = NULL;
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int i, ii, j;
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int newfds;
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int cancel_oldtype;
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error_t reauthenticate (mach_port_t port, mach_port_t *result)
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{
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error_t err;
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mach_port_t ref;
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ref = __mach_reply_port ();
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int cancel_oldtype;
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cancel_oldtype = LIBC_CANCEL_ASYNC();
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do
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err = __io_reauthenticate (port, ref, MACH_MSG_TYPE_MAKE_SEND);
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while (err == EINTR);
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if (!err)
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do
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err = __USEPORT_CANCEL (AUTH, __auth_user_authenticate (port,
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ref, MACH_MSG_TYPE_MAKE_SEND,
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result));
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while (err == EINTR);
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LIBC_CANCEL_RESET (cancel_oldtype);
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__mach_port_destroy (__mach_task_self (), ref);
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return err;
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}
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/* Find the total number of bytes to be read. */
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amount = 0;
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for (i = 0; i < message->msg_iovlen; i++)
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{
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amount += message->msg_iov[i].iov_len;
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/* As an optimization, we set the initial values of DATA and LEN
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from the first non-empty iovec. This kicks-in in the case
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where the whole packet fits into that iovec buffer. */
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if (data == NULL && message->msg_iov[i].iov_len > 0)
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{
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data = message->msg_iov[i].iov_base;
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len = message->msg_iov[i].iov_len;
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}
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}
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buf = data;
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cancel_oldtype = LIBC_CANCEL_ASYNC();
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err = HURD_DPORT_USE_CANCEL (fd, __socket_recv (port, &aport,
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flags, &data, &len,
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&ports, &nports,
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&cdata, &clen,
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&message->msg_flags, amount));
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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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if (message->msg_name != NULL && aport != MACH_PORT_NULL)
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{
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char *buf = message->msg_name;
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mach_msg_type_number_t buflen = message->msg_namelen;
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int type;
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cancel_oldtype = LIBC_CANCEL_ASYNC();
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err = __socket_whatis_address (aport, &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 = message->msg_name;
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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 (), aport);
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return __hurd_sockfail (fd, flags, err);
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}
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if (message->msg_namelen > buflen)
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message->msg_namelen = buflen;
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if (buf != message->msg_name)
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{
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memcpy (message->msg_name, buf, message->msg_namelen);
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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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((struct sockaddr *) message->msg_name)->sa_family = type;
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}
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else if (message->msg_name != NULL)
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message->msg_namelen = 0;
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__mach_port_deallocate (__mach_task_self (), aport);
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if (buf == data)
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buf += len;
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else
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{
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/* Copy the data into MSG. */
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if (len > amount)
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message->msg_flags |= MSG_TRUNC;
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else
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amount = len;
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buf = data;
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for (i = 0; i < message->msg_iovlen; i++)
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{
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#define min(a, b) ((a) > (b) ? (b) : (a))
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size_t copy = min (message->msg_iov[i].iov_len, amount);
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memcpy (message->msg_iov[i].iov_base, buf, copy);
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buf += copy;
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amount -= copy;
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if (len == 0)
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break;
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}
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__vm_deallocate (__mach_task_self (), (vm_address_t) data, len);
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}
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/* Copy the control message into MSG. */
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if (clen > message->msg_controllen)
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message->msg_flags |= MSG_CTRUNC;
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else
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message->msg_controllen = clen;
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memcpy (message->msg_control, cdata, message->msg_controllen);
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if (nports > 0)
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{
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newports = __alloca (nports * sizeof (mach_port_t));
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opened_fds = __alloca (nports * sizeof (int));
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}
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/* This counts how many ports we processed completely. */
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i = 0;
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/* This counts how many new fds we create. */
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newfds = 0;
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for (cmsg = CMSG_FIRSTHDR (message);
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cmsg;
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cmsg = CMSG_NXTHDR (message, cmsg))
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{
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if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS)
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{
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/* SCM_RIGHTS support. */
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/* The fd's flags are passed in the control data. */
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int *fds = (int *) CMSG_DATA (cmsg);
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nfds = (cmsg->cmsg_len - CMSG_ALIGN (sizeof (struct cmsghdr)))
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/ sizeof (int);
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for (j = 0; j < nfds; j++)
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{
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err = reauthenticate (ports[i], &newports[newfds]);
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if (err)
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goto cleanup;
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fds[j] = opened_fds[newfds] = _hurd_intern_fd (newports[newfds],
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fds[j], 0);
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if (fds[j] == -1)
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{
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err = errno;
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__mach_port_deallocate (__mach_task_self (), newports[newfds]);
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goto cleanup;
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}
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i++;
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newfds++;
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}
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}
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}
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for (i = 0; i < nports; i++)
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__mach_port_deallocate (mach_task_self (), ports[i]);
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__vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
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return (buf - data);
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cleanup:
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/* Clean up all the file descriptors from port 0 to i-1. */
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if (nports > 0)
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{
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ii = 0;
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newfds = 0;
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for (cmsg = CMSG_FIRSTHDR (message);
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cmsg;
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cmsg = CMSG_NXTHDR (message, cmsg))
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{
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if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS)
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{
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nfds = (cmsg->cmsg_len - CMSG_ALIGN (sizeof (struct cmsghdr)))
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/ sizeof (int);
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for (j = 0; j < nfds && ii < i; j++, ii++, newfds++)
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{
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_hurd_fd_close (_hurd_fd_get (opened_fds[newfds]));
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__mach_port_deallocate (__mach_task_self (), newports[newfds]);
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__mach_port_deallocate (__mach_task_self (), ports[ii]);
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}
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}
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}
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}
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__vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
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return __hurd_fail (err);
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}
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weak_alias (__libc_recvmsg, recvmsg)
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weak_alias (__libc_recvmsg, __recvmsg)
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