tmux/client.c

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/* $Id: client.c,v 1.21 2007-11-12 15:12:08 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 <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "tmux.h"
void client_handle_winch(struct client_ctx *);
int client_process_local(struct client_ctx *, char **);
int
client_init(const char *path, struct client_ctx *cctx, int start_server)
{
struct sockaddr_un sa;
struct stat sb;
struct msg_identify_data data;
struct winsize ws;
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size_t size;
int mode;
u_int retries;
retries = 0;
retry:
if (stat(path, &sb) != 0) {
if (start_server && errno == ENOENT && retries < 10) {
if (server_start(path) != 0)
return (-1);
usleep(10000);
retries++;
goto retry;
}
log_warn("%s: stat", path);
return (-1);
}
if (!S_ISSOCK(sb.st_mode)) {
log_warnx("%s: %s", path, strerror(ENOTSOCK));
return (-1);
}
memset(&sa, 0, sizeof sa);
sa.sun_family = AF_UNIX;
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size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
if (size >= sizeof sa.sun_path) {
log_warnx("%s: %s", path, strerror(ENAMETOOLONG));
return (-1);
}
if ((cctx->srv_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
log_warn("%s: socket", path);
return (-1);
}
if (connect(
cctx->srv_fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
if (start_server && errno == ECONNREFUSED && retries < 10) {
if (unlink(path) != 0) {
log_warn("%s: unlink", path);
return (-1);
}
usleep(10000);
retries++;
goto retry;
}
log_warn("%s: connect", path);
return (-1);
}
if ((mode = fcntl(cctx->srv_fd, F_GETFL)) == -1) {
log_warn("%s: fcntl", path);
return (-1);
}
if (fcntl(cctx->srv_fd, F_SETFL, mode|O_NONBLOCK) == -1) {
log_warn("%s: fcntl", path);
return (-1);
}
cctx->srv_in = buffer_create(BUFSIZ);
cctx->srv_out = buffer_create(BUFSIZ);
if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) {
log_warn("ioctl(TIOCGWINSZ)");
return (-1);
}
data.sx = ws.ws_col;
data.sy = ws.ws_row;
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if (ttyname_r(STDIN_FILENO, data.tty, sizeof data.tty) != 0)
fatal("ttyname_r failed");
client_write_server(cctx, MSG_IDENTIFY, &data, sizeof data);
}
return (0);
}
int
client_main(struct client_ctx *cctx)
{
struct pollfd pfds[2];
char *error;
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int timeout;
siginit();
if ((cctx->loc_fd = local_init(&cctx->loc_in, &cctx->loc_out)) == -1)
return (1);
logfile("client");
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#ifndef NO_SETPROCTITLE
setproctitle("client");
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#endif
error = NULL;
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timeout = INFTIM;
while (!sigterm) {
if (sigwinch)
client_handle_winch(cctx);
pfds[0].fd = cctx->srv_fd;
pfds[0].events = POLLIN;
if (BUFFER_USED(cctx->srv_out) > 0)
pfds[0].events |= POLLOUT;
pfds[1].fd = cctx->loc_fd;
pfds[1].events = POLLIN;
if (BUFFER_USED(cctx->loc_out) > 0)
pfds[1].events |= POLLOUT;
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if (poll(pfds, 2, timeout) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (buffer_poll(&pfds[0], cctx->srv_in, cctx->srv_out) != 0)
goto server_dead;
if (buffer_poll(&pfds[1], cctx->loc_in, cctx->loc_out) != 0)
goto local_dead;
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if (cctx->flags & CCTX_PAUSE) {
usleep(750000);
cctx->flags = 0;
}
if (client_process_local(cctx, &error) == -1)
goto out;
switch (client_msg_dispatch(cctx, &error)) {
case -1:
goto out;
case 0:
/* May be more in buffer, don't let poll block. */
timeout = 0;
break;
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default:
/* Out of data, poll may block. */
timeout = INFTIM;
break;
}
}
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out:
local_done();
if (sigterm) {
printf("[terminated]\n");
return (1);
}
if (cctx->flags & CCTX_EXIT) {
printf("[exited]\n");
return (0);
}
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if (cctx->flags & CCTX_DETACH) {
printf("[detached]\n");
return (0);
}
printf("[error: %s]\n", error);
return (1);
server_dead:
local_done();
printf("[lost server]\n");
return (0);
local_dead:
/* Can't do much here. Log and die. */
fatalx("local socket dead");
}
void
client_handle_winch(struct client_ctx *cctx)
{
struct msg_resize_data data;
struct winsize ws;
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
fatal("ioctl failed");
data.sx = ws.ws_col;
data.sy = ws.ws_row;
client_write_server(cctx, MSG_RESIZE, &data, sizeof data);
sigwinch = 0;
}
int
client_process_local(struct client_ctx *cctx, unused char **error)
{
struct buffer *b;
int key;
b = buffer_create(BUFSIZ);
while ((key = local_key()) != KEYC_NONE)
input_store16(b, (uint16_t) key);
log_debug("transmitting %zu bytes of input", BUFFER_USED(b));
if (BUFFER_USED(b) != 0) {
client_write_server(
cctx, MSG_KEYS, BUFFER_OUT(b), BUFFER_USED(b));
}
buffer_destroy(b);
return (0);
}