Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.46
1.46 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.45 2017/07/12 10:04:51 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:
1.43 nicm 39: static void cmd_pipe_pane_write_callback(struct bufferevent *, void *);
1.37 nicm 40: static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
1.4 nicm 41:
1.1 nicm 42: const struct cmd_entry cmd_pipe_pane_entry = {
1.34 nicm 43: .name = "pipe-pane",
44: .alias = "pipep",
45:
46: .args = { "ot:", 0, 1 },
47: .usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]",
48:
1.41 nicm 49: .target = { 't', CMD_FIND_PANE, 0 },
1.35 nicm 50:
1.38 nicm 51: .flags = CMD_AFTERHOOK,
1.34 nicm 52: .exec = cmd_pipe_pane_exec
1.1 nicm 53: };
54:
1.37 nicm 55: static enum cmd_retval
1.39 nicm 56: cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
1.1 nicm 57: {
1.17 nicm 58: struct args *args = self->args;
1.41 nicm 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;
1.29 nicm 63: char *cmd;
1.18 nicm 64: int old_fd, pipe_fd[2], null_fd;
1.29 nicm 65: struct format_tree *ft;
1.45 nicm 66: sigset_t set, oldset;
1.1 nicm 67:
68: /* Destroy the old pipe. */
69: old_fd = wp->pipe_fd;
70: if (wp->pipe_fd != -1) {
1.4 nicm 71: bufferevent_free(wp->pipe_event);
1.1 nicm 72: close(wp->pipe_fd);
73: wp->pipe_fd = -1;
1.43 nicm 74:
75: if (window_pane_destroy_ready(wp)) {
76: server_destroy_pane(wp, 1);
77: return (CMD_RETURN_NORMAL);
78: }
1.1 nicm 79: }
80:
81: /* If no pipe command, that is enough. */
1.17 nicm 82: if (args->argc == 0 || *args->argv[0] == '\0')
1.22 nicm 83: return (CMD_RETURN_NORMAL);
1.1 nicm 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: */
1.17 nicm 91: if (args_has(self->args, 'o') && old_fd != -1)
1.22 nicm 92: return (CMD_RETURN_NORMAL);
1.1 nicm 93:
94: /* Open the new pipe. */
1.4 nicm 95: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
1.39 nicm 96: cmdq_error(item, "socketpair error: %s", strerror(errno));
1.22 nicm 97: return (CMD_RETURN_ERROR);
1.1 nicm 98: }
99:
1.29 nicm 100: /* Expand the command. */
1.42 nicm 101: ft = format_create(item->client, item, FORMAT_NONE, 0);
1.29 nicm 102: format_defaults(ft, c, s, wl, wp);
103: cmd = format_expand_time(ft, args->argv[0], time(NULL));
104: format_free(ft);
105:
1.1 nicm 106: /* Fork the child. */
1.45 nicm 107: sigfillset(&set);
108: sigprocmask(SIG_BLOCK, &set, &oldset);
1.1 nicm 109: switch (fork()) {
110: case -1:
1.45 nicm 111: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.39 nicm 112: cmdq_error(item, "fork error: %s", strerror(errno));
1.29 nicm 113:
114: free(cmd);
1.22 nicm 115: return (CMD_RETURN_ERROR);
1.1 nicm 116: case 0:
117: /* Child process. */
1.46 ! nicm 118: proc_clear_signals(server_proc, 1);
1.45 nicm 119: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 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:
1.16 nicm 135: closefrom(STDERR_FILENO + 1);
136:
1.29 nicm 137: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 138: _exit(1);
139: default:
140: /* Parent process. */
1.45 nicm 141: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 142: close(pipe_fd[1]);
143:
144: wp->pipe_fd = pipe_fd[0];
1.5 nicm 145: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.9 nicm 146:
1.43 nicm 147: wp->pipe_event = bufferevent_new(wp->pipe_fd, NULL,
148: cmd_pipe_pane_write_callback, cmd_pipe_pane_error_callback,
149: wp);
1.4 nicm 150: bufferevent_enable(wp->pipe_event, EV_WRITE);
1.9 nicm 151:
1.18 nicm 152: setblocking(wp->pipe_fd, 0);
1.29 nicm 153:
154: free(cmd);
1.22 nicm 155: return (CMD_RETURN_NORMAL);
1.1 nicm 156: }
1.4 nicm 157: }
158:
1.37 nicm 159: static void
1.43 nicm 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
1.30 nicm 170: cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
171: __unused short what, void *data)
1.4 nicm 172: {
173: struct window_pane *wp = data;
174:
1.43 nicm 175: log_debug("%%%u pipe error", wp->id);
176:
1.4 nicm 177: bufferevent_free(wp->pipe_event);
178: close(wp->pipe_fd);
179: wp->pipe_fd = -1;
1.43 nicm 180:
181: if (window_pane_destroy_ready(wp))
182: server_destroy_pane(wp, 1);
1.1 nicm 183: }
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