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https://github.com/libguestfs/libguestfs.git
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105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/* libguestfs
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* Copyright (C) 2009-2025 Red Hat Inc.
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*
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* This 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 of the License, or (at your option) any later version.
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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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* Helper functions for the actions code in F<lib/actions-*.c>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "guestfs.h"
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#include "guestfs-internal.h"
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#include "guestfs_protocol.h"
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/* Check the return message from a call for validity. */
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int
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guestfs_int_check_reply_header (guestfs_h *g,
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const struct guestfs_message_header *hdr,
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unsigned int proc_nr, unsigned int serial)
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{
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if (hdr->prog != GUESTFS_PROGRAM) {
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error (g, "wrong program (%u/%d)", hdr->prog, GUESTFS_PROGRAM);
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return -1;
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}
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if (hdr->vers != GUESTFS_PROTOCOL_VERSION) {
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error (g, "wrong protocol version (%u/%d)",
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hdr->vers, GUESTFS_PROTOCOL_VERSION);
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return -1;
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}
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if (hdr->direction != GUESTFS_DIRECTION_REPLY) {
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error (g, "unexpected message direction (%d/%d)",
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(int) hdr->direction, GUESTFS_DIRECTION_REPLY);
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return -1;
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}
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if (hdr->proc != proc_nr) {
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error (g, "unexpected procedure number (%d/%u)", (int) hdr->proc, proc_nr);
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return -1;
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}
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if (hdr->serial != serial) {
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error (g, "unexpected serial (%u/%u)", hdr->serial, serial);
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return -1;
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}
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return 0;
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}
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/* Check the appliance is up when running a daemon_function. */
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int
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guestfs_int_check_appliance_up (guestfs_h *g, const char *caller)
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{
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if (g->state == CONFIG || g->state == LAUNCHING) {
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error (g, "%s: call launch before using this function\n(in guestfish, don't forget to use the 'run' command)",
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caller);
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return -1;
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}
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return 0;
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}
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/* Convenience wrapper for tracing. */
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void
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guestfs_int_trace_open (struct trace_buffer *tb)
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{
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tb->buf = NULL;
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tb->len = 0;
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tb->fp = open_memstream (&tb->buf, &tb->len);
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if (tb->fp)
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tb->opened = true;
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else {
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tb->opened = false;
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/* Fall back to writing messages to stderr. */
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free (tb->buf);
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tb->buf = NULL;
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tb->fp = stderr;
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}
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}
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void
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guestfs_int_trace_send_line (guestfs_h *g, struct trace_buffer *tb)
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{
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if (tb->opened) {
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fclose (tb->fp);
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tb->fp = NULL;
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guestfs_int_call_callbacks_message (g, GUESTFS_EVENT_TRACE, tb->buf, tb->len);
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free (tb->buf);
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tb->buf = NULL;
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}
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}
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