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/* $OpenBSD: cmd-pipe-pane.c,v 1.2 2009/10/21 18:12:31 nicm Exp $ */
/*
* Copyright (c) 2009 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 <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
/*
* Open pipe to redirect pane output. If already open, close first.
*/
int cmd_pipe_pane_exec(struct cmd *, struct cmd_ctx *);
const struct cmd_entry cmd_pipe_pane_entry = {
"pipe-pane", "pipep",
CMD_TARGET_PANE_USAGE "[-o] [command]",
CMD_ARG01, CMD_CHFLAG('o'),
cmd_target_init,
cmd_target_parse,
cmd_pipe_pane_exec,
cmd_target_free,
cmd_target_print
};
int
cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
{
struct cmd_target_data *data = self->data;
struct window_pane *wp;
int old_fd, pipe_fd[2], null_fd, mode;
if (cmd_find_pane(ctx, data->target, NULL, &wp) == NULL)
return (-1);
/* Destroy the old pipe. */
old_fd = wp->pipe_fd;
if (wp->pipe_fd != -1) {
buffer_destroy(wp->pipe_buf);
close(wp->pipe_fd);
wp->pipe_fd = -1;
}
/* If no pipe command, that is enough. */
if (data->arg == NULL || *data->arg == '\0')
return (0);
/*
* With -o, only open the new pipe if there was no previous one. This
* allows a pipe to be toggled with a single key, for example:
*
* bind ^p pipep -o 'cat >>~/output'
*/
if (data->chflags & CMD_CHFLAG('o') && old_fd != -1)
return (0);
/* Open the new pipe. */
if (pipe(pipe_fd) != 0) {
ctx->error(ctx, "pipe error: %s", strerror(errno));
return (-1);
}
/* Fork the child. */
switch (fork()) {
case -1:
ctx->error(ctx, "fork error: %s", strerror(errno));
return (-1);
case 0:
/* Child process. */
close(pipe_fd[0]);
sigreset();
if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
_exit(1);
if (pipe_fd[1] != STDIN_FILENO)
close(pipe_fd[1]);
null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
if (dup2(null_fd, STDOUT_FILENO) == -1)
_exit(1);
if (dup2(null_fd, STDERR_FILENO) == -1)
_exit(1);
if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
close(null_fd);
execl(_PATH_BSHELL, "sh", "-c", data->arg, (char *) NULL);
_exit(1);
default:
/* Parent process. */
close(pipe_fd[1]);
wp->pipe_fd = pipe_fd[0];
wp->pipe_buf = buffer_create(BUFSIZ);
wp->pipe_off = BUFFER_USED(wp->in);
if ((mode = fcntl(wp->pipe_fd, F_GETFL)) == -1)
fatal("fcntl failed");
if (fcntl(wp->pipe_fd, F_SETFL, mode|O_NONBLOCK) == -1)
fatal("fcntl failed");
if (fcntl(wp->pipe_fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
return (0);
}
return (0);
}
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