Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.61
1.61 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.60 2022/05/30 13:03:46 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>
1.45 nicm 25: #include <signal.h>
1.29 nicm 26: #include <stdlib.h>
1.1 nicm 27: #include <string.h>
1.13 nicm 28: #include <time.h>
1.1 nicm 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:
1.39 nicm 37: static enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmdq_item *);
1.1 nicm 38:
1.47 nicm 39: static void cmd_pipe_pane_read_callback(struct bufferevent *, void *);
1.43 nicm 40: static void cmd_pipe_pane_write_callback(struct bufferevent *, void *);
1.37 nicm 41: static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
1.4 nicm 42:
1.1 nicm 43: const struct cmd_entry cmd_pipe_pane_entry = {
1.34 nicm 44: .name = "pipe-pane",
45: .alias = "pipep",
46:
1.58 nicm 47: .args = { "IOot:", 0, 1, NULL },
1.56 nicm 48: .usage = "[-IOo] " CMD_TARGET_PANE_USAGE " [shell-command]",
1.34 nicm 49:
1.41 nicm 50: .target = { 't', CMD_FIND_PANE, 0 },
1.35 nicm 51:
1.38 nicm 52: .flags = CMD_AFTERHOOK,
1.34 nicm 53: .exec = cmd_pipe_pane_exec
1.1 nicm 54: };
55:
1.37 nicm 56: static enum cmd_retval
1.39 nicm 57: cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
1.1 nicm 58: {
1.55 nicm 59: struct args *args = cmd_get_args(self);
60: struct cmd_find_state *target = cmdq_get_target(item);
61: struct client *tc = cmdq_get_target_client(item);
62: struct window_pane *wp = target->wp;
63: struct session *s = target->s;
64: struct winlink *wl = target->wl;
65: struct window_pane_offset *wpo = &wp->pipe_offset;
66: char *cmd;
67: int old_fd, pipe_fd[2], null_fd, in, out;
68: struct format_tree *ft;
69: sigset_t set, oldset;
1.60 nicm 70:
71: /* Do nothing if pane is dead. */
1.61 ! nicm 72: if (window_pane_exited(wp)) {
1.60 nicm 73: cmdq_error(item, "target pane has exited");
74: return (CMD_RETURN_ERROR);
75: }
1.1 nicm 76:
77: /* Destroy the old pipe. */
78: old_fd = wp->pipe_fd;
79: if (wp->pipe_fd != -1) {
1.4 nicm 80: bufferevent_free(wp->pipe_event);
1.1 nicm 81: close(wp->pipe_fd);
82: wp->pipe_fd = -1;
1.43 nicm 83:
84: if (window_pane_destroy_ready(wp)) {
85: server_destroy_pane(wp, 1);
86: return (CMD_RETURN_NORMAL);
87: }
1.1 nicm 88: }
89:
90: /* If no pipe command, that is enough. */
1.57 nicm 91: if (args_count(args) == 0 || *args_string(args, 0) == '\0')
1.22 nicm 92: return (CMD_RETURN_NORMAL);
1.1 nicm 93:
94: /*
95: * With -o, only open the new pipe if there was no previous one. This
96: * allows a pipe to be toggled with a single key, for example:
97: *
98: * bind ^p pipep -o 'cat >>~/output'
99: */
1.52 nicm 100: if (args_has(args, 'o') && old_fd != -1)
1.22 nicm 101: return (CMD_RETURN_NORMAL);
1.1 nicm 102:
1.47 nicm 103: /* What do we want to do? Neither -I or -O is -O. */
1.52 nicm 104: if (args_has(args, 'I')) {
1.47 nicm 105: in = 1;
1.52 nicm 106: out = args_has(args, 'O');
1.47 nicm 107: } else {
108: in = 0;
109: out = 1;
110: }
111:
1.1 nicm 112: /* Open the new pipe. */
1.4 nicm 113: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
1.39 nicm 114: cmdq_error(item, "socketpair error: %s", strerror(errno));
1.22 nicm 115: return (CMD_RETURN_ERROR);
1.1 nicm 116: }
117:
1.29 nicm 118: /* Expand the command. */
1.53 nicm 119: ft = format_create(cmdq_get_client(item), item, FORMAT_NONE, 0);
1.54 nicm 120: format_defaults(ft, tc, s, wl, wp);
1.57 nicm 121: cmd = format_expand_time(ft, args_string(args, 0));
1.29 nicm 122: format_free(ft);
123:
1.1 nicm 124: /* Fork the child. */
1.45 nicm 125: sigfillset(&set);
126: sigprocmask(SIG_BLOCK, &set, &oldset);
1.1 nicm 127: switch (fork()) {
128: case -1:
1.45 nicm 129: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.39 nicm 130: cmdq_error(item, "fork error: %s", strerror(errno));
1.29 nicm 131:
132: free(cmd);
1.22 nicm 133: return (CMD_RETURN_ERROR);
1.1 nicm 134: case 0:
135: /* Child process. */
1.46 nicm 136: proc_clear_signals(server_proc, 1);
1.45 nicm 137: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 138: close(pipe_fd[0]);
139:
1.59 deraadt 140: null_fd = open(_PATH_DEVNULL, O_WRONLY);
1.47 nicm 141: if (out) {
142: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
143: _exit(1);
144: } else {
145: if (dup2(null_fd, STDIN_FILENO) == -1)
146: _exit(1);
147: }
148: if (in) {
149: if (dup2(pipe_fd[1], STDOUT_FILENO) == -1)
150: _exit(1);
151: if (pipe_fd[1] != STDOUT_FILENO)
152: close(pipe_fd[1]);
153: } else {
154: if (dup2(null_fd, STDOUT_FILENO) == -1)
155: _exit(1);
156: }
1.1 nicm 157: if (dup2(null_fd, STDERR_FILENO) == -1)
158: _exit(1);
1.16 nicm 159: closefrom(STDERR_FILENO + 1);
160:
1.29 nicm 161: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 162: _exit(1);
163: default:
164: /* Parent process. */
1.45 nicm 165: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 166: close(pipe_fd[1]);
167:
168: wp->pipe_fd = pipe_fd[0];
1.55 nicm 169: memcpy(wpo, &wp->offset, sizeof *wpo);
1.9 nicm 170:
1.47 nicm 171: setblocking(wp->pipe_fd, 0);
172: wp->pipe_event = bufferevent_new(wp->pipe_fd,
173: cmd_pipe_pane_read_callback,
174: cmd_pipe_pane_write_callback,
175: cmd_pipe_pane_error_callback,
1.43 nicm 176: wp);
1.48 nicm 177: if (wp->pipe_event == NULL)
178: fatalx("out of memory");
1.47 nicm 179: if (out)
180: bufferevent_enable(wp->pipe_event, EV_WRITE);
181: if (in)
182: bufferevent_enable(wp->pipe_event, EV_READ);
1.29 nicm 183:
184: free(cmd);
1.22 nicm 185: return (CMD_RETURN_NORMAL);
1.1 nicm 186: }
1.4 nicm 187: }
188:
1.37 nicm 189: static void
1.47 nicm 190: cmd_pipe_pane_read_callback(__unused struct bufferevent *bufev, void *data)
191: {
192: struct window_pane *wp = data;
193: struct evbuffer *evb = wp->pipe_event->input;
194: size_t available;
195:
196: available = EVBUFFER_LENGTH(evb);
197: log_debug("%%%u pipe read %zu", wp->id, available);
198:
199: bufferevent_write(wp->event, EVBUFFER_DATA(evb), available);
200: evbuffer_drain(evb, available);
201:
202: if (window_pane_destroy_ready(wp))
203: server_destroy_pane(wp, 1);
204: }
205:
206: static void
1.43 nicm 207: cmd_pipe_pane_write_callback(__unused struct bufferevent *bufev, void *data)
208: {
209: struct window_pane *wp = data;
210:
211: log_debug("%%%u pipe empty", wp->id);
1.47 nicm 212:
1.43 nicm 213: if (window_pane_destroy_ready(wp))
214: server_destroy_pane(wp, 1);
215: }
216:
217: static void
1.30 nicm 218: cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
219: __unused short what, void *data)
1.4 nicm 220: {
221: struct window_pane *wp = data;
222:
1.43 nicm 223: log_debug("%%%u pipe error", wp->id);
224:
1.4 nicm 225: bufferevent_free(wp->pipe_event);
226: close(wp->pipe_fd);
227: wp->pipe_fd = -1;
1.43 nicm 228:
229: if (window_pane_destroy_ready(wp))
230: server_destroy_pane(wp, 1);
1.1 nicm 231: }
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