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https://github.com/tmux/tmux.git
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7502cb3adb
Originally, tmux commands were parsed in the client process into a struct with the command data which was then serialised and sent to the server to be executed. The parsing was later moved into the server (an argv was sent from the client), but the parse step and intermediate struct was kept. This change removes that struct and the separate parse step. Argument parsing and printing is now common to all commands (in arguments.c) with each command left with just an optional check function (to validate the arguments at parse time), the exec function and a function to set up any key bindings (renamed from the old init function). This is overall more simple and consistent. There should be no changes to any commands behaviour or syntax although as this touches every command please watch for any unexpected changes.
149 lines
3.7 KiB
C
149 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 <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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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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"ot:", 0, 1,
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CMD_TARGET_PANE_USAGE "[-o] [command]",
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0,
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NULL,
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NULL,
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cmd_pipe_pane_exec
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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 args *args = self->args;
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struct client *c;
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struct window_pane *wp;
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char *command;
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int old_fd, pipe_fd[2], null_fd, mode;
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if ((c = cmd_find_client(ctx, NULL)) == NULL)
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return (-1);
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if (cmd_find_pane(ctx, args_get(args, 't'), 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 (args->argc == 0 || *args->argv[0] == '\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 (args_has(self->args, '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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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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command = status_replace(c, NULL, args->argv[0], time(NULL), 0);
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execl(_PATH_BSHELL, "sh", "-c", command, (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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return (0);
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}
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}
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/* ARGSUSED */
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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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