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/* $OpenBSD: client-msg.c,v 1.3 2009/07/21 18:52:03 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
int client_msg_fn_detach(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_error(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_shutdown(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_exit(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_exited(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_suspend(struct hdr *, struct client_ctx *, char **);
struct client_msg {
enum hdrtype type;
int (*fn)(struct hdr *, struct client_ctx *, char **);
};
struct client_msg client_msg_table[] = {
{ MSG_DETACH, client_msg_fn_detach },
{ MSG_ERROR, client_msg_fn_error },
{ MSG_EXIT, client_msg_fn_exit },
{ MSG_EXITED, client_msg_fn_exited },
{ MSG_SHUTDOWN, client_msg_fn_shutdown },
{ MSG_SUSPEND, client_msg_fn_suspend },
};
int
client_msg_dispatch(struct client_ctx *cctx, char **error)
{
struct hdr hdr;
struct client_msg *msg;
u_int i;
if (BUFFER_USED(cctx->srv_in) < sizeof hdr)
return (1);
memcpy(&hdr, BUFFER_OUT(cctx->srv_in), sizeof hdr);
if (BUFFER_USED(cctx->srv_in) < (sizeof hdr) + hdr.size)
return (1);
buffer_remove(cctx->srv_in, sizeof hdr);
for (i = 0; i < nitems(client_msg_table); i++) {
msg = client_msg_table + i;
if (msg->type == hdr.type) {
if (msg->fn(&hdr, cctx, error) != 0)
return (-1);
return (0);
}
}
fatalx("unexpected message");
}
int
client_msg_fn_error(struct hdr *hdr, struct client_ctx *cctx, char **error)
{
if (hdr->size == SIZE_MAX)
fatalx("bad MSG_ERROR size");
*error = xmalloc(hdr->size + 1);
buffer_read(cctx->srv_in, *error, hdr->size);
(*error)[hdr->size] = '\0';
return (-1);
}
int
client_msg_fn_detach(
struct hdr *hdr, struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_DETACH size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->flags |= CCTX_DETACH;
return (0);
}
int
client_msg_fn_shutdown(
struct hdr *hdr, struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_SHUTDOWN size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->flags |= CCTX_SHUTDOWN;
return (0);
}
int
client_msg_fn_exit(
struct hdr *hdr, struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_EXIT size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->flags |= CCTX_EXIT;
return (0);
}
int
client_msg_fn_exited(
struct hdr *hdr, unused struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_EXITED size");
return (-1);
}
int
client_msg_fn_suspend(
struct hdr *hdr, unused struct client_ctx *cctx, unused char **error)
{
struct sigaction act;
if (hdr->size != 0)
fatalx("bad MSG_SUSPEND size");
memset(&act, 0, sizeof act);
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
act.sa_handler = SIG_DFL;
if (sigaction(SIGTSTP, &act, NULL) != 0)
fatal("sigaction failed");
act.sa_handler = sighandler;
if (sigaction(SIGCONT, &act, NULL) != 0)
fatal("sigaction failed");
kill(getpid(), SIGTSTP);
return (0);
}
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