mirror of
https://github.com/tmux/tmux.git
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155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
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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 <stdlib.h>
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#include <string.h>
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#include <time.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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static enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmd_q *);
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static 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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.name = "pipe-pane",
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.alias = "pipep",
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.args = { "ot:", 0, 1 },
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.usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]",
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.tflag = CMD_PANE,
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.flags = 0,
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.exec = cmd_pipe_pane_exec
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};
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static enum cmd_retval
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cmd_pipe_pane_exec(struct cmd *self, struct cmd_q *cmdq)
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{
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struct args *args = self->args;
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struct client *c = cmdq->state.c;
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struct window_pane *wp = cmdq->state.tflag.wp;
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struct session *s = cmdq->state.tflag.s;
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struct winlink *wl = cmdq->state.tflag.wl;
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char *cmd;
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int old_fd, pipe_fd[2], null_fd;
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struct format_tree *ft;
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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 (args->argc == 0 || *args->argv[0] == '\0')
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return (CMD_RETURN_NORMAL);
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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 (args_has(self->args, 'o') && old_fd != -1)
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return (CMD_RETURN_NORMAL);
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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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cmdq_error(cmdq, "socketpair error: %s", strerror(errno));
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return (CMD_RETURN_ERROR);
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}
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/* Expand the command. */
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ft = format_create(cmdq, 0);
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format_defaults(ft, c, s, wl, wp);
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cmd = format_expand_time(ft, args->argv[0], time(NULL));
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format_free(ft);
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/* Fork the child. */
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switch (fork()) {
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case -1:
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cmdq_error(cmdq, "fork error: %s", strerror(errno));
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free(cmd);
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return (CMD_RETURN_ERROR);
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case 0:
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/* Child process. */
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close(pipe_fd[0]);
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clear_signals(1);
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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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closefrom(STDERR_FILENO + 1);
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execl(_PATH_BSHELL, "sh", "-c", cmd, (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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setblocking(wp->pipe_fd, 0);
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free(cmd);
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return (CMD_RETURN_NORMAL);
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}
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}
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static void
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cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
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__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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