Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.21
1.21 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.20 2011/07/30 17:52:32 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",
1.17 nicm 41: "ot:", 0, 1,
1.21 ! nicm 42: "[-o] " CMD_TARGET_PANE_USAGE " [command]",
1.17 nicm 43: 0,
44: NULL,
45: NULL,
46: cmd_pipe_pane_exec
1.1 nicm 47: };
48:
49: int
50: cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
51: {
1.17 nicm 52: struct args *args = self->args;
1.13 nicm 53: struct client *c;
1.1 nicm 54: struct window_pane *wp;
1.13 nicm 55: char *command;
1.18 nicm 56: int old_fd, pipe_fd[2], null_fd;
1.1 nicm 57:
1.17 nicm 58: if (cmd_find_pane(ctx, args_get(args, 't'), NULL, &wp) == NULL)
1.1 nicm 59: return (-1);
1.20 nicm 60: c = cmd_find_client(ctx, NULL);
1.1 nicm 61:
62: /* Destroy the old pipe. */
63: old_fd = wp->pipe_fd;
64: if (wp->pipe_fd != -1) {
1.4 nicm 65: bufferevent_free(wp->pipe_event);
1.1 nicm 66: close(wp->pipe_fd);
67: wp->pipe_fd = -1;
68: }
69:
70: /* If no pipe command, that is enough. */
1.17 nicm 71: if (args->argc == 0 || *args->argv[0] == '\0')
1.1 nicm 72: return (0);
73:
74: /*
75: * With -o, only open the new pipe if there was no previous one. This
76: * allows a pipe to be toggled with a single key, for example:
77: *
78: * bind ^p pipep -o 'cat >>~/output'
79: */
1.17 nicm 80: if (args_has(self->args, 'o') && old_fd != -1)
1.1 nicm 81: return (0);
82:
83: /* Open the new pipe. */
1.4 nicm 84: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
85: ctx->error(ctx, "socketpair error: %s", strerror(errno));
1.1 nicm 86: return (-1);
87: }
88:
89: /* Fork the child. */
90: switch (fork()) {
91: case -1:
92: ctx->error(ctx, "fork error: %s", strerror(errno));
1.9 nicm 93: return (-1);
1.1 nicm 94: case 0:
95: /* Child process. */
96: close(pipe_fd[0]);
1.15 nicm 97: clear_signals(1);
1.1 nicm 98:
99: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
100: _exit(1);
101: if (pipe_fd[1] != STDIN_FILENO)
102: close(pipe_fd[1]);
103:
104: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
105: if (dup2(null_fd, STDOUT_FILENO) == -1)
106: _exit(1);
107: if (dup2(null_fd, STDERR_FILENO) == -1)
108: _exit(1);
109: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
110: close(null_fd);
111:
1.16 nicm 112: closefrom(STDERR_FILENO + 1);
113:
1.19 nicm 114: command = status_replace(
115: c, NULL, NULL, NULL, args->argv[0], time(NULL), 0);
1.13 nicm 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:
1.18 nicm 129: setblocking(wp->pipe_fd, 0);
1.1 nicm 130: return (0);
131: }
1.4 nicm 132: }
133:
1.8 nicm 134: /* ARGSUSED */
1.4 nicm 135: void
136: cmd_pipe_pane_error_callback(
137: unused struct bufferevent *bufev, unused short what, void *data)
138: {
139: struct window_pane *wp = data;
140:
141: bufferevent_free(wp->pipe_event);
142: close(wp->pipe_fd);
143: wp->pipe_fd = -1;
1.1 nicm 144: }
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