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a02c7e804c
The evbuffer API is very similar to the existing tmux buffer API so this was remarkably painless. Not many possible ways to do it, I suppose.
144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <string.h>
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#include <unistd.h>
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#include "tmux.h"
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/*
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* Open pipe to redirect pane output. If already open, close first.
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*/
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int cmd_pipe_pane_exec(struct cmd *, struct cmd_ctx *);
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void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
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const struct cmd_entry cmd_pipe_pane_entry = {
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"pipe-pane", "pipep",
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CMD_TARGET_PANE_USAGE "[-o] [command]",
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CMD_ARG01, CMD_CHFLAG('o'),
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cmd_target_init,
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cmd_target_parse,
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cmd_pipe_pane_exec,
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cmd_target_free,
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cmd_target_print
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};
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int
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cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
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{
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struct cmd_target_data *data = self->data;
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struct window_pane *wp;
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int old_fd, pipe_fd[2], null_fd, mode;
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if (cmd_find_pane(ctx, data->target, NULL, &wp) == NULL)
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return (-1);
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/* Destroy the old pipe. */
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old_fd = wp->pipe_fd;
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if (wp->pipe_fd != -1) {
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bufferevent_free(wp->pipe_event);
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close(wp->pipe_fd);
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wp->pipe_fd = -1;
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}
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/* If no pipe command, that is enough. */
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if (data->arg == NULL || *data->arg == '\0')
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return (0);
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/*
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* With -o, only open the new pipe if there was no previous one. This
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* allows a pipe to be toggled with a single key, for example:
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*
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* bind ^p pipep -o 'cat >>~/output'
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*/
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if (data->chflags & CMD_CHFLAG('o') && old_fd != -1)
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return (0);
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/* Open the new pipe. */
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
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ctx->error(ctx, "socketpair error: %s", strerror(errno));
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return (-1);
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}
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/* Fork the child. */
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switch (fork()) {
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case -1:
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ctx->error(ctx, "fork error: %s", strerror(errno));
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return (-1);
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case 0:
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/* Child process. */
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close(pipe_fd[0]);
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server_signal_clear();
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if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
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_exit(1);
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if (pipe_fd[1] != STDIN_FILENO)
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close(pipe_fd[1]);
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null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
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if (dup2(null_fd, STDOUT_FILENO) == -1)
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_exit(1);
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if (dup2(null_fd, STDERR_FILENO) == -1)
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_exit(1);
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if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
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close(null_fd);
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execl(_PATH_BSHELL, "sh", "-c", data->arg, (char *) NULL);
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_exit(1);
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default:
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/* Parent process. */
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close(pipe_fd[1]);
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wp->pipe_fd = pipe_fd[0];
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wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
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wp->pipe_event = bufferevent_new(wp->pipe_fd,
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NULL, NULL, cmd_pipe_pane_error_callback, wp);
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bufferevent_enable(wp->pipe_event, EV_WRITE);
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if ((mode = fcntl(wp->pipe_fd, F_GETFL)) == -1)
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fatal("fcntl failed");
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if (fcntl(wp->pipe_fd, F_SETFL, mode|O_NONBLOCK) == -1)
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fatal("fcntl failed");
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if (fcntl(wp->pipe_fd, F_SETFD, FD_CLOEXEC) == -1)
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fatal("fcntl failed");
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return (0);
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}
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return (0);
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}
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void
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cmd_pipe_pane_error_callback(
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unused struct bufferevent *bufev, unused short what, void *data)
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{
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struct window_pane *wp = data;
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bufferevent_free(wp->pipe_event);
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close(wp->pipe_fd);
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wp->pipe_fd = -1;
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}
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