Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.44
1.44 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.43 2017/07/03 08:16:03 nicm Exp $ */
1.1 nicm 2:
3: /*
1.36 nicm 4: * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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>
1.4 nicm 20: #include <sys/socket.h>
1.1 nicm 21:
22: #include <errno.h>
23: #include <fcntl.h>
24: #include <paths.h>
1.29 nicm 25: #include <stdlib.h>
1.1 nicm 26: #include <string.h>
1.13 nicm 27: #include <time.h>
1.1 nicm 28: #include <unistd.h>
29:
30: #include "tmux.h"
31:
32: /*
33: * Open pipe to redirect pane output. If already open, close first.
34: */
35:
1.39 nicm 36: static enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmdq_item *);
1.1 nicm 37:
1.43 nicm 38: static void cmd_pipe_pane_write_callback(struct bufferevent *, void *);
1.37 nicm 39: static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
1.4 nicm 40:
1.1 nicm 41: const struct cmd_entry cmd_pipe_pane_entry = {
1.34 nicm 42: .name = "pipe-pane",
43: .alias = "pipep",
44:
45: .args = { "ot:", 0, 1 },
46: .usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]",
47:
1.41 nicm 48: .target = { 't', CMD_FIND_PANE, 0 },
1.35 nicm 49:
1.38 nicm 50: .flags = CMD_AFTERHOOK,
1.34 nicm 51: .exec = cmd_pipe_pane_exec
1.1 nicm 52: };
53:
1.37 nicm 54: static enum cmd_retval
1.39 nicm 55: cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
1.1 nicm 56: {
1.17 nicm 57: struct args *args = self->args;
1.41 nicm 58: struct client *c = cmd_find_client(item, NULL, 1);
59: struct window_pane *wp = item->target.wp;
60: struct session *s = item->target.s;
61: struct winlink *wl = item->target.wl;
1.29 nicm 62: char *cmd;
1.18 nicm 63: int old_fd, pipe_fd[2], null_fd;
1.29 nicm 64: struct format_tree *ft;
1.1 nicm 65:
66: /* Destroy the old pipe. */
67: old_fd = wp->pipe_fd;
68: if (wp->pipe_fd != -1) {
1.4 nicm 69: bufferevent_free(wp->pipe_event);
1.1 nicm 70: close(wp->pipe_fd);
71: wp->pipe_fd = -1;
1.43 nicm 72:
73: if (window_pane_destroy_ready(wp)) {
74: server_destroy_pane(wp, 1);
75: return (CMD_RETURN_NORMAL);
76: }
1.1 nicm 77: }
78:
79: /* If no pipe command, that is enough. */
1.17 nicm 80: if (args->argc == 0 || *args->argv[0] == '\0')
1.22 nicm 81: return (CMD_RETURN_NORMAL);
1.1 nicm 82:
83: /*
84: * With -o, only open the new pipe if there was no previous one. This
85: * allows a pipe to be toggled with a single key, for example:
86: *
87: * bind ^p pipep -o 'cat >>~/output'
88: */
1.17 nicm 89: if (args_has(self->args, 'o') && old_fd != -1)
1.22 nicm 90: return (CMD_RETURN_NORMAL);
1.1 nicm 91:
92: /* Open the new pipe. */
1.4 nicm 93: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
1.39 nicm 94: cmdq_error(item, "socketpair error: %s", strerror(errno));
1.22 nicm 95: return (CMD_RETURN_ERROR);
1.1 nicm 96: }
97:
1.29 nicm 98: /* Expand the command. */
1.42 nicm 99: ft = format_create(item->client, item, FORMAT_NONE, 0);
1.29 nicm 100: format_defaults(ft, c, s, wl, wp);
101: cmd = format_expand_time(ft, args->argv[0], time(NULL));
102: format_free(ft);
103:
1.1 nicm 104: /* Fork the child. */
105: switch (fork()) {
106: case -1:
1.39 nicm 107: cmdq_error(item, "fork error: %s", strerror(errno));
1.29 nicm 108:
109: free(cmd);
1.22 nicm 110: return (CMD_RETURN_ERROR);
1.1 nicm 111: case 0:
112: /* Child process. */
113: close(pipe_fd[0]);
1.44 ! nicm 114: proc_clear_signals(server_proc);
1.1 nicm 115:
116: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
117: _exit(1);
118: if (pipe_fd[1] != STDIN_FILENO)
119: close(pipe_fd[1]);
120:
121: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
122: if (dup2(null_fd, STDOUT_FILENO) == -1)
123: _exit(1);
124: if (dup2(null_fd, STDERR_FILENO) == -1)
125: _exit(1);
126: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
127: close(null_fd);
128:
1.16 nicm 129: closefrom(STDERR_FILENO + 1);
130:
1.29 nicm 131: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 132: _exit(1);
133: default:
134: /* Parent process. */
135: close(pipe_fd[1]);
136:
137: wp->pipe_fd = pipe_fd[0];
1.5 nicm 138: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.9 nicm 139:
1.43 nicm 140: wp->pipe_event = bufferevent_new(wp->pipe_fd, NULL,
141: cmd_pipe_pane_write_callback, cmd_pipe_pane_error_callback,
142: wp);
1.4 nicm 143: bufferevent_enable(wp->pipe_event, EV_WRITE);
1.9 nicm 144:
1.18 nicm 145: setblocking(wp->pipe_fd, 0);
1.29 nicm 146:
147: free(cmd);
1.22 nicm 148: return (CMD_RETURN_NORMAL);
1.1 nicm 149: }
1.4 nicm 150: }
151:
1.37 nicm 152: static void
1.43 nicm 153: cmd_pipe_pane_write_callback(__unused struct bufferevent *bufev, void *data)
154: {
155: struct window_pane *wp = data;
156:
157: log_debug("%%%u pipe empty", wp->id);
158: if (window_pane_destroy_ready(wp))
159: server_destroy_pane(wp, 1);
160: }
161:
162: static void
1.30 nicm 163: cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
164: __unused short what, void *data)
1.4 nicm 165: {
166: struct window_pane *wp = data;
167:
1.43 nicm 168: log_debug("%%%u pipe error", wp->id);
169:
1.4 nicm 170: bufferevent_free(wp->pipe_event);
171: close(wp->pipe_fd);
172: wp->pipe_fd = -1;
1.43 nicm 173:
174: if (window_pane_destroy_ready(wp))
175: server_destroy_pane(wp, 1);
1.1 nicm 176: }
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