103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
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* The Qubes OS Project, http://www.qubes-os.org
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*
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* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
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*
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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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*
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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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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <errno.h>
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#include <libvchan.h>
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int wait_for_vchan_or_argfd_once(libvchan_t *ctrl, int max, fd_set * rdset, fd_set * wrset)
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{
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int vfd, ret;
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struct timespec tv = { 1, 100000000 };
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sigset_t empty_set;
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sigemptyset(&empty_set);
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vfd = libvchan_fd_for_select(ctrl);
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FD_SET(vfd, rdset);
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if (vfd > max)
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max = vfd;
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max++;
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ret = pselect(max, rdset, wrset, NULL, &tv, &empty_set);
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if (ret < 0) {
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if (errno != EINTR) {
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perror("select");
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exit(1);
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} else {
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FD_ZERO(rdset);
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FD_ZERO(wrset);
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fprintf(stderr, "eintr\n");
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return 1;
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}
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}
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if (!libvchan_is_open(ctrl)) {
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fprintf(stderr, "libvchan_is_eof\n");
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exit(0);
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}
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if (FD_ISSET(vfd, rdset))
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// the following will never block; we need to do this to
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// clear libvchan_fd pending state
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libvchan_wait(ctrl);
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if (libvchan_data_ready(ctrl))
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return 1;
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return ret;
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}
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void wait_for_vchan_or_argfd(libvchan_t *ctrl, int max, fd_set * rdset, fd_set * wrset)
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{
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fd_set r = *rdset, w = *wrset;
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do {
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*rdset = r;
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*wrset = w;
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}
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while (wait_for_vchan_or_argfd_once(ctrl, max, rdset, wrset) == 0);
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}
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int write_vchan_all(libvchan_t *vchan, void *data, size_t size) {
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int pos, ret;
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pos = 0;
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while (pos < size) {
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ret = libvchan_write(vchan, data+pos, size-pos);
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if (ret < 0)
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return 0;
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pos += ret;
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}
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return 1;
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}
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int read_vchan_all(libvchan_t *vchan, void *data, size_t size) {
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int pos, ret;
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pos = 0;
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while (pos < size) {
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ret = libvchan_read(vchan, data+pos, size-pos);
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if (ret < 0)
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return 0;
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pos += ret;
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}
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return 1;
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}
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