Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.26
1.26 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.25 2013/03/24 09:54:10 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:
1.25 nicm 35: enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmd_q *);
1.1 nicm 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: cmd_pipe_pane_exec
1.1 nicm 46: };
47:
1.22 nicm 48: enum cmd_retval
1.25 nicm 49: cmd_pipe_pane_exec(struct cmd *self, struct cmd_q *cmdq)
1.1 nicm 50: {
1.17 nicm 51: struct args *args = self->args;
1.13 nicm 52: struct client *c;
1.1 nicm 53: struct window_pane *wp;
1.13 nicm 54: char *command;
1.18 nicm 55: int old_fd, pipe_fd[2], null_fd;
1.1 nicm 56:
1.25 nicm 57: if (cmd_find_pane(cmdq, args_get(args, 't'), NULL, &wp) == NULL)
1.22 nicm 58: return (CMD_RETURN_ERROR);
1.25 nicm 59: c = cmd_find_client(cmdq, NULL, 1);
1.1 nicm 60:
61: /* Destroy the old pipe. */
62: old_fd = wp->pipe_fd;
63: if (wp->pipe_fd != -1) {
1.4 nicm 64: bufferevent_free(wp->pipe_event);
1.1 nicm 65: close(wp->pipe_fd);
66: wp->pipe_fd = -1;
67: }
68:
69: /* If no pipe command, that is enough. */
1.17 nicm 70: if (args->argc == 0 || *args->argv[0] == '\0')
1.22 nicm 71: return (CMD_RETURN_NORMAL);
1.1 nicm 72:
73: /*
74: * With -o, only open the new pipe if there was no previous one. This
75: * allows a pipe to be toggled with a single key, for example:
76: *
77: * bind ^p pipep -o 'cat >>~/output'
78: */
1.17 nicm 79: if (args_has(self->args, 'o') && old_fd != -1)
1.22 nicm 80: return (CMD_RETURN_NORMAL);
1.1 nicm 81:
82: /* Open the new pipe. */
1.4 nicm 83: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
1.25 nicm 84: cmdq_error(cmdq, "socketpair error: %s", strerror(errno));
1.22 nicm 85: return (CMD_RETURN_ERROR);
1.1 nicm 86: }
87:
88: /* Fork the child. */
89: switch (fork()) {
90: case -1:
1.25 nicm 91: cmdq_error(cmdq, "fork error: %s", strerror(errno));
1.22 nicm 92: return (CMD_RETURN_ERROR);
1.1 nicm 93: case 0:
94: /* Child process. */
95: close(pipe_fd[0]);
1.15 nicm 96: clear_signals(1);
1.1 nicm 97:
98: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
99: _exit(1);
100: if (pipe_fd[1] != STDIN_FILENO)
101: close(pipe_fd[1]);
102:
103: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
104: if (dup2(null_fd, STDOUT_FILENO) == -1)
105: _exit(1);
106: if (dup2(null_fd, STDERR_FILENO) == -1)
107: _exit(1);
108: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
109: close(null_fd);
110:
1.16 nicm 111: closefrom(STDERR_FILENO + 1);
112:
1.19 nicm 113: command = status_replace(
114: c, NULL, NULL, NULL, args->argv[0], time(NULL), 0);
1.13 nicm 115: execl(_PATH_BSHELL, "sh", "-c", command, (char *) NULL);
1.1 nicm 116: _exit(1);
117: default:
118: /* Parent process. */
119: close(pipe_fd[1]);
120:
121: wp->pipe_fd = pipe_fd[0];
1.5 nicm 122: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.9 nicm 123:
1.4 nicm 124: wp->pipe_event = bufferevent_new(wp->pipe_fd,
125: NULL, NULL, cmd_pipe_pane_error_callback, wp);
126: bufferevent_enable(wp->pipe_event, EV_WRITE);
1.9 nicm 127:
1.18 nicm 128: setblocking(wp->pipe_fd, 0);
1.22 nicm 129: return (CMD_RETURN_NORMAL);
1.1 nicm 130: }
1.4 nicm 131: }
132:
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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