Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.15
1.15 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.14 2010/06/14 23:06:13 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>
1.13 nicm 26: #include <time.h>
1.1 nicm 27: #include <unistd.h>
28:
29: #include "tmux.h"
30:
31: /*
32: * Open pipe to redirect pane output. If already open, close first.
33: */
34:
35: int cmd_pipe_pane_exec(struct cmd *, struct cmd_ctx *);
36:
1.4 nicm 37: void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
38:
1.1 nicm 39: const struct cmd_entry cmd_pipe_pane_entry = {
40: "pipe-pane", "pipep",
41: CMD_TARGET_PANE_USAGE "[-o] [command]",
1.7 nicm 42: CMD_ARG01, "o",
1.1 nicm 43: cmd_target_init,
44: cmd_target_parse,
45: cmd_pipe_pane_exec,
46: cmd_target_free,
47: cmd_target_print
48: };
49:
50: int
51: cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
52: {
53: struct cmd_target_data *data = self->data;
1.13 nicm 54: struct client *c;
1.1 nicm 55: struct window_pane *wp;
1.13 nicm 56: char *command;
1.1 nicm 57: int old_fd, pipe_fd[2], null_fd, mode;
58:
1.14 nicm 59: if ((c = cmd_find_client(ctx, NULL)) == NULL)
1.13 nicm 60: return (-1);
61:
1.2 nicm 62: if (cmd_find_pane(ctx, data->target, NULL, &wp) == NULL)
1.1 nicm 63: return (-1);
64:
65: /* Destroy the old pipe. */
66: old_fd = wp->pipe_fd;
67: if (wp->pipe_fd != -1) {
1.4 nicm 68: bufferevent_free(wp->pipe_event);
1.1 nicm 69: close(wp->pipe_fd);
70: wp->pipe_fd = -1;
71: }
72:
73: /* If no pipe command, that is enough. */
74: if (data->arg == NULL || *data->arg == '\0')
75: return (0);
76:
77: /*
78: * With -o, only open the new pipe if there was no previous one. This
79: * allows a pipe to be toggled with a single key, for example:
80: *
81: * bind ^p pipep -o 'cat >>~/output'
82: */
1.7 nicm 83: if (cmd_check_flag(data->chflags, 'o') && old_fd != -1)
1.1 nicm 84: return (0);
85:
86: /* Open the new pipe. */
1.4 nicm 87: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
88: ctx->error(ctx, "socketpair error: %s", strerror(errno));
1.1 nicm 89: return (-1);
90: }
91:
92: /* Fork the child. */
93: switch (fork()) {
94: case -1:
95: ctx->error(ctx, "fork error: %s", strerror(errno));
1.9 nicm 96: return (-1);
1.1 nicm 97: case 0:
98: /* Child process. */
99: close(pipe_fd[0]);
1.15 ! nicm 100: clear_signals(1);
1.1 nicm 101:
102: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
103: _exit(1);
104: if (pipe_fd[1] != STDIN_FILENO)
105: close(pipe_fd[1]);
106:
107: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
108: if (dup2(null_fd, STDOUT_FILENO) == -1)
109: _exit(1);
110: if (dup2(null_fd, STDERR_FILENO) == -1)
111: _exit(1);
112: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
113: close(null_fd);
114:
1.13 nicm 115: command = status_replace(c, NULL, data->arg, time(NULL), 0);
116: execl(_PATH_BSHELL, "sh", "-c", command, (char *) NULL);
1.1 nicm 117: _exit(1);
118: default:
119: /* Parent process. */
120: close(pipe_fd[1]);
121:
122: wp->pipe_fd = pipe_fd[0];
1.5 nicm 123: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.9 nicm 124:
1.4 nicm 125: wp->pipe_event = bufferevent_new(wp->pipe_fd,
126: NULL, NULL, cmd_pipe_pane_error_callback, wp);
127: bufferevent_enable(wp->pipe_event, EV_WRITE);
1.9 nicm 128:
1.1 nicm 129: if ((mode = fcntl(wp->pipe_fd, F_GETFL)) == -1)
130: fatal("fcntl failed");
131: if (fcntl(wp->pipe_fd, F_SETFL, mode|O_NONBLOCK) == -1)
132: fatal("fcntl failed");
133: if (fcntl(wp->pipe_fd, F_SETFD, FD_CLOEXEC) == -1)
1.9 nicm 134: fatal("fcntl failed");
1.1 nicm 135: return (0);
136: }
1.4 nicm 137: }
138:
1.8 nicm 139: /* ARGSUSED */
1.4 nicm 140: void
141: cmd_pipe_pane_error_callback(
142: unused struct bufferevent *bufev, unused short what, void *data)
143: {
144: struct window_pane *wp = data;
145:
146: bufferevent_free(wp->pipe_event);
147: close(wp->pipe_fd);
148: wp->pipe_fd = -1;
1.1 nicm 149: }
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