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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/tmux/cmd-pipe-pane.c	Lines:	0	71	0.0 %
Date:	2017-11-13	Branches:	0	29	0.0 %


/* $OpenBSD: cmd-pipe-pane.c,v 1.46 2017/07/14 18:49:07 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * 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/socket.h>

#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Open pipe to redirect pane output. If already open, close first.
 */

static enum cmd_retval	cmd_pipe_pane_exec(struct cmd *, struct cmdq_item *);

static void cmd_pipe_pane_write_callback(struct bufferevent *, void *);
static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);

const struct cmd_entry cmd_pipe_pane_entry = {
	.name = "pipe-pane",
	.alias = "pipep",

	.args = { "ot:", 0, 1 },
	.usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]",

	.target = { 't', CMD_FIND_PANE, 0 },

	.flags = CMD_AFTERHOOK,
	.exec = cmd_pipe_pane_exec
};

static enum cmd_retval
cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = self->args;
	struct client		*c = cmd_find_client(item, NULL, 1);
	struct window_pane	*wp = item->target.wp;
	struct session		*s = item->target.s;
	struct winlink		*wl = item->target.wl;
	char			*cmd;
	int			 old_fd, pipe_fd[2], null_fd;
	struct format_tree	*ft;
	sigset_t		 set, oldset;

	/* Destroy the old pipe. */
	old_fd = wp->pipe_fd;
	if (wp->pipe_fd != -1) {
		bufferevent_free(wp->pipe_event);
		close(wp->pipe_fd);
		wp->pipe_fd = -1;

		if (window_pane_destroy_ready(wp)) {
			server_destroy_pane(wp, 1);
			return (CMD_RETURN_NORMAL);
		}
	}

	/* If no pipe command, that is enough. */
	if (args->argc == 0 || *args->argv[0] == '\0')
		return (CMD_RETURN_NORMAL);

	/*
	 * 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 (args_has(self->args, 'o') && old_fd != -1)
		return (CMD_RETURN_NORMAL);

	/* Open the new pipe. */
	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
		cmdq_error(item, "socketpair error: %s", strerror(errno));
		return (CMD_RETURN_ERROR);
	}

	/* Expand the command. */
	ft = format_create(item->client, item, FORMAT_NONE, 0);
	format_defaults(ft, c, s, wl, wp);
	cmd = format_expand_time(ft, args->argv[0], time(NULL));
	format_free(ft);

	/* Fork the child. */
	sigfillset(&set);
	sigprocmask(SIG_BLOCK, &set, &oldset);
	switch (fork()) {
	case -1:
		sigprocmask(SIG_SETMASK, &oldset, NULL);
		cmdq_error(item, "fork error: %s", strerror(errno));

		free(cmd);
		return (CMD_RETURN_ERROR);
	case 0:
		/* Child process. */
		proc_clear_signals(server_proc, 1);
		sigprocmask(SIG_SETMASK, &oldset, NULL);
		close(pipe_fd[0]);

		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);

		closefrom(STDERR_FILENO + 1);

		execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
		_exit(1);
	default:
		/* Parent process. */
		sigprocmask(SIG_SETMASK, &oldset, NULL);
		close(pipe_fd[1]);

		wp->pipe_fd = pipe_fd[0];
		wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);

		wp->pipe_event = bufferevent_new(wp->pipe_fd, NULL,
		    cmd_pipe_pane_write_callback, cmd_pipe_pane_error_callback,
		    wp);
		bufferevent_enable(wp->pipe_event, EV_WRITE);

		setblocking(wp->pipe_fd, 0);

		free(cmd);
		return (CMD_RETURN_NORMAL);
	}
}

static void
cmd_pipe_pane_write_callback(__unused struct bufferevent *bufev, void *data)
{
	struct window_pane	*wp = data;

	log_debug("%%%u pipe empty", wp->id);
	if (window_pane_destroy_ready(wp))
		server_destroy_pane(wp, 1);
}

static void
cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
    __unused short what, void *data)
{
	struct window_pane	*wp = data;

	log_debug("%%%u pipe error", wp->id);

	bufferevent_free(wp->pipe_event);
	close(wp->pipe_fd);
	wp->pipe_fd = -1;

	if (window_pane_destroy_ready(wp))
		server_destroy_pane(wp, 1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: cmd-pipe-pane.c,v 1.46 2017/07/14 18:49:07 nicm Exp $ */
2
3			/*
4			* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15			* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16			* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/types.h>
20			#include <sys/socket.h>
21
22			#include <errno.h>
23			#include <fcntl.h>
24			#include <paths.h>
25			#include <signal.h>
26			#include <stdlib.h>
27			#include <string.h>
28			#include <time.h>
29			#include <unistd.h>
30
31			#include "tmux.h"
32
33			/*
34			* Open pipe to redirect pane output. If already open, close first.
35			*/
36
37			static enum cmd_retval cmd_pipe_pane_exec(struct cmd , struct cmdq_item );
38
39			static void cmd_pipe_pane_write_callback(struct bufferevent , void );
40			static void cmd_pipe_pane_error_callback(struct bufferevent , short, void );
41
42			const struct cmd_entry cmd_pipe_pane_entry = {
43			.name = "pipe-pane",
44			.alias = "pipep",
45
46			.args = { "ot:", 0, 1 },
47			.usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]",
48
49			.target = { 't', CMD_FIND_PANE, 0 },
50
51			.flags = CMD_AFTERHOOK,
52			.exec = cmd_pipe_pane_exec
53			};
54
55			static enum cmd_retval
56			cmd_pipe_pane_exec(struct cmd self, struct cmdq_item item)
57			{
58			struct args *args = self->args;
59			struct client *c = cmd_find_client(item, NULL, 1);
60			struct window_pane *wp = item->target.wp;
61			struct session *s = item->target.s;
62			struct winlink *wl = item->target.wl;
63			char *cmd;
64			int old_fd, pipe_fd[2], null_fd;
65			struct format_tree *ft;
66			sigset_t set, oldset;
67
68			/* Destroy the old pipe. */
69			old_fd = wp->pipe_fd;
70			if (wp->pipe_fd != -1) {
71			bufferevent_free(wp->pipe_event);
72			close(wp->pipe_fd);
73			wp->pipe_fd = -1;
74
75			if (window_pane_destroy_ready(wp)) {
76			server_destroy_pane(wp, 1);
77			return (CMD_RETURN_NORMAL);
78			}
79			}
80
81			/* If no pipe command, that is enough. */
82			if (args->argc == 0 \|\| *args->argv[0] == '\0')
83			return (CMD_RETURN_NORMAL);
84
85			/*
86			* With -o, only open the new pipe if there was no previous one. This
87			* allows a pipe to be toggled with a single key, for example:
88			*
89			* bind ^p pipep -o 'cat >>~/output'
90			*/
91			if (args_has(self->args, 'o') && old_fd != -1)
92			return (CMD_RETURN_NORMAL);
93
94			/* Open the new pipe. */
95			if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
96			cmdq_error(item, "socketpair error: %s", strerror(errno));
97			return (CMD_RETURN_ERROR);
98			}
99
100			/* Expand the command. */
101			ft = format_create(item->client, item, FORMAT_NONE, 0);
102			format_defaults(ft, c, s, wl, wp);
103			cmd = format_expand_time(ft, args->argv[0], time(NULL));
104			format_free(ft);
105
106			/* Fork the child. */
107			sigfillset(&set);
108			sigprocmask(SIG_BLOCK, &set, &oldset);
109			switch (fork()) {
110			case -1:
111			sigprocmask(SIG_SETMASK, &oldset, NULL);
112			cmdq_error(item, "fork error: %s", strerror(errno));
113
114			free(cmd);
115			return (CMD_RETURN_ERROR);
116			case 0:
117			/* Child process. */
118			proc_clear_signals(server_proc, 1);
119			sigprocmask(SIG_SETMASK, &oldset, NULL);
120			close(pipe_fd[0]);
121
122			if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
123			_exit(1);
124			if (pipe_fd[1] != STDIN_FILENO)
125			close(pipe_fd[1]);
126
127			null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
128			if (dup2(null_fd, STDOUT_FILENO) == -1)
129			_exit(1);
130			if (dup2(null_fd, STDERR_FILENO) == -1)
131			_exit(1);
132			if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
133			close(null_fd);
134
135			closefrom(STDERR_FILENO + 1);
136
137			execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
138			_exit(1);
139			default:
140			/* Parent process. */
141			sigprocmask(SIG_SETMASK, &oldset, NULL);
142			close(pipe_fd[1]);
143
144			wp->pipe_fd = pipe_fd[0];
145			wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
146
147			wp->pipe_event = bufferevent_new(wp->pipe_fd, NULL,
148			cmd_pipe_pane_write_callback, cmd_pipe_pane_error_callback,
149			wp);
150			bufferevent_enable(wp->pipe_event, EV_WRITE);
151
152			setblocking(wp->pipe_fd, 0);
153
154			free(cmd);
155			return (CMD_RETURN_NORMAL);
156			}
157			}
158
159			static void
160			cmd_pipe_pane_write_callback(__unused struct bufferevent bufev, void data)
161			{
162			struct window_pane *wp = data;
163
164			log_debug("%%%u pipe empty", wp->id);
165			if (window_pane_destroy_ready(wp))
166			server_destroy_pane(wp, 1);
167			}
168
169			static void
170			cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
171			__unused short what, void *data)
172			{
173			struct window_pane *wp = data;
174
175			log_debug("%%%u pipe error", wp->id);
176
177			bufferevent_free(wp->pipe_event);
178			close(wp->pipe_fd);
179			wp->pipe_fd = -1;
180
181			if (window_pane_destroy_ready(wp))
182			server_destroy_pane(wp, 1);
183			}