Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.8
1.8 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.7 2009/11/13 19:53:29 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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>
25: #include <string.h>
26: #include <unistd.h>
27:
28: #include "tmux.h"
29:
30: /*
31: * Open pipe to redirect pane output. If already open, close first.
32: */
33:
34: int cmd_pipe_pane_exec(struct cmd *, struct cmd_ctx *);
35:
1.4 nicm 36: void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
37:
1.1 nicm 38: const struct cmd_entry cmd_pipe_pane_entry = {
39: "pipe-pane", "pipep",
40: CMD_TARGET_PANE_USAGE "[-o] [command]",
1.7 nicm 41: CMD_ARG01, "o",
1.1 nicm 42: cmd_target_init,
43: cmd_target_parse,
44: cmd_pipe_pane_exec,
45: cmd_target_free,
46: cmd_target_print
47: };
48:
49: int
50: cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
51: {
52: struct cmd_target_data *data = self->data;
53: struct window_pane *wp;
54: int old_fd, pipe_fd[2], null_fd, mode;
55:
1.2 nicm 56: if (cmd_find_pane(ctx, data->target, NULL, &wp) == NULL)
1.1 nicm 57: return (-1);
58:
59: /* Destroy the old pipe. */
60: old_fd = wp->pipe_fd;
61: if (wp->pipe_fd != -1) {
1.4 nicm 62: bufferevent_free(wp->pipe_event);
1.1 nicm 63: close(wp->pipe_fd);
64: wp->pipe_fd = -1;
65: }
66:
67: /* If no pipe command, that is enough. */
68: if (data->arg == NULL || *data->arg == '\0')
69: return (0);
70:
71: /*
72: * With -o, only open the new pipe if there was no previous one. This
73: * allows a pipe to be toggled with a single key, for example:
74: *
75: * bind ^p pipep -o 'cat >>~/output'
76: */
1.7 nicm 77: if (cmd_check_flag(data->chflags, 'o') && old_fd != -1)
1.1 nicm 78: return (0);
79:
80: /* Open the new pipe. */
1.4 nicm 81: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
82: ctx->error(ctx, "socketpair error: %s", strerror(errno));
1.1 nicm 83: return (-1);
84: }
85:
86: /* Fork the child. */
87: switch (fork()) {
88: case -1:
89: ctx->error(ctx, "fork error: %s", strerror(errno));
90: return (-1);
91: case 0:
92: /* Child process. */
93: close(pipe_fd[0]);
1.3 nicm 94: server_signal_clear();
1.1 nicm 95:
96: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
97: _exit(1);
98: if (pipe_fd[1] != STDIN_FILENO)
99: close(pipe_fd[1]);
100:
101: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
102: if (dup2(null_fd, STDOUT_FILENO) == -1)
103: _exit(1);
104: if (dup2(null_fd, STDERR_FILENO) == -1)
105: _exit(1);
106: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
107: close(null_fd);
108:
109: execl(_PATH_BSHELL, "sh", "-c", data->arg, (char *) NULL);
110: _exit(1);
111: default:
112: /* Parent process. */
113: close(pipe_fd[1]);
114:
115: wp->pipe_fd = pipe_fd[0];
1.5 nicm 116: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.1 nicm 117:
1.4 nicm 118: wp->pipe_event = bufferevent_new(wp->pipe_fd,
119: NULL, NULL, cmd_pipe_pane_error_callback, wp);
120: bufferevent_enable(wp->pipe_event, EV_WRITE);
121:
1.1 nicm 122: if ((mode = fcntl(wp->pipe_fd, F_GETFL)) == -1)
123: fatal("fcntl failed");
124: if (fcntl(wp->pipe_fd, F_SETFL, mode|O_NONBLOCK) == -1)
125: fatal("fcntl failed");
126: if (fcntl(wp->pipe_fd, F_SETFD, FD_CLOEXEC) == -1)
127: fatal("fcntl failed");
128: return (0);
129: }
1.4 nicm 130: }
131:
1.8 ! nicm 132: /* ARGSUSED */
1.4 nicm 133: void
134: cmd_pipe_pane_error_callback(
135: unused struct bufferevent *bufev, unused short what, void *data)
136: {
137: struct window_pane *wp = data;
138:
139: bufferevent_free(wp->pipe_event);
140: close(wp->pipe_fd);
141: wp->pipe_fd = -1;
1.1 nicm 142: }
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