Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.27
1.27 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.26 2013/10/10 12:00:21 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: cmd_pipe_pane_exec
1.1 nicm 45: };
46:
1.22 nicm 47: enum cmd_retval
1.25 nicm 48: cmd_pipe_pane_exec(struct cmd *self, struct cmd_q *cmdq)
1.1 nicm 49: {
1.17 nicm 50: struct args *args = self->args;
1.13 nicm 51: struct client *c;
1.1 nicm 52: struct window_pane *wp;
1.13 nicm 53: char *command;
1.18 nicm 54: int old_fd, pipe_fd[2], null_fd;
1.1 nicm 55:
1.25 nicm 56: if (cmd_find_pane(cmdq, args_get(args, 't'), NULL, &wp) == NULL)
1.22 nicm 57: return (CMD_RETURN_ERROR);
1.25 nicm 58: c = cmd_find_client(cmdq, NULL, 1);
1.1 nicm 59:
60: /* Destroy the old pipe. */
61: old_fd = wp->pipe_fd;
62: if (wp->pipe_fd != -1) {
1.4 nicm 63: bufferevent_free(wp->pipe_event);
1.1 nicm 64: close(wp->pipe_fd);
65: wp->pipe_fd = -1;
66: }
67:
68: /* If no pipe command, that is enough. */
1.17 nicm 69: if (args->argc == 0 || *args->argv[0] == '\0')
1.22 nicm 70: return (CMD_RETURN_NORMAL);
1.1 nicm 71:
72: /*
73: * With -o, only open the new pipe if there was no previous one. This
74: * allows a pipe to be toggled with a single key, for example:
75: *
76: * bind ^p pipep -o 'cat >>~/output'
77: */
1.17 nicm 78: if (args_has(self->args, 'o') && old_fd != -1)
1.22 nicm 79: return (CMD_RETURN_NORMAL);
1.1 nicm 80:
81: /* Open the new pipe. */
1.4 nicm 82: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
1.25 nicm 83: cmdq_error(cmdq, "socketpair error: %s", strerror(errno));
1.22 nicm 84: return (CMD_RETURN_ERROR);
1.1 nicm 85: }
86:
87: /* Fork the child. */
88: switch (fork()) {
89: case -1:
1.25 nicm 90: cmdq_error(cmdq, "fork error: %s", strerror(errno));
1.22 nicm 91: return (CMD_RETURN_ERROR);
1.1 nicm 92: case 0:
93: /* Child process. */
94: close(pipe_fd[0]);
1.15 nicm 95: clear_signals(1);
1.1 nicm 96:
97: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
98: _exit(1);
99: if (pipe_fd[1] != STDIN_FILENO)
100: close(pipe_fd[1]);
101:
102: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
103: if (dup2(null_fd, STDOUT_FILENO) == -1)
104: _exit(1);
105: if (dup2(null_fd, STDERR_FILENO) == -1)
106: _exit(1);
107: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
108: close(null_fd);
109:
1.16 nicm 110: closefrom(STDERR_FILENO + 1);
111:
1.19 nicm 112: command = status_replace(
113: c, NULL, NULL, NULL, args->argv[0], time(NULL), 0);
1.13 nicm 114: execl(_PATH_BSHELL, "sh", "-c", command, (char *) NULL);
1.1 nicm 115: _exit(1);
116: default:
117: /* Parent process. */
118: close(pipe_fd[1]);
119:
120: wp->pipe_fd = pipe_fd[0];
1.5 nicm 121: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.9 nicm 122:
1.4 nicm 123: wp->pipe_event = bufferevent_new(wp->pipe_fd,
124: NULL, NULL, cmd_pipe_pane_error_callback, wp);
125: bufferevent_enable(wp->pipe_event, EV_WRITE);
1.9 nicm 126:
1.18 nicm 127: setblocking(wp->pipe_fd, 0);
1.22 nicm 128: return (CMD_RETURN_NORMAL);
1.1 nicm 129: }
1.4 nicm 130: }
131:
132: void
133: cmd_pipe_pane_error_callback(
134: unused struct bufferevent *bufev, unused short what, void *data)
135: {
136: struct window_pane *wp = data;
137:
138: bufferevent_free(wp->pipe_event);
139: close(wp->pipe_fd);
140: wp->pipe_fd = -1;
1.1 nicm 141: }
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