Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.32
1.32 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.31 2015/12/08 08:34:18 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>
1.29 nicm 25: #include <stdlib.h>
1.1 nicm 26: #include <string.h>
1.13 nicm 27: #include <time.h>
1.1 nicm 28: #include <unistd.h>
29:
30: #include "tmux.h"
31:
32: /*
33: * Open pipe to redirect pane output. If already open, close first.
34: */
35:
1.25 nicm 36: enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmd_q *);
1.1 nicm 37:
1.4 nicm 38: void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
39:
1.1 nicm 40: const struct cmd_entry cmd_pipe_pane_entry = {
41: "pipe-pane", "pipep",
1.17 nicm 42: "ot:", 0, 1,
1.21 nicm 43: "[-o] " CMD_TARGET_PANE_USAGE " [command]",
1.17 nicm 44: 0,
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;
1.29 nicm 53: struct session *s;
54: struct winlink *wl;
1.1 nicm 55: struct window_pane *wp;
1.29 nicm 56: char *cmd;
1.18 nicm 57: int old_fd, pipe_fd[2], null_fd;
1.29 nicm 58: struct format_tree *ft;
1.1 nicm 59:
1.29 nicm 60: if ((wl = cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp)) == NULL)
1.22 nicm 61: return (CMD_RETURN_ERROR);
1.25 nicm 62: c = cmd_find_client(cmdq, NULL, 1);
1.1 nicm 63:
64: /* Destroy the old pipe. */
65: old_fd = wp->pipe_fd;
66: if (wp->pipe_fd != -1) {
1.4 nicm 67: bufferevent_free(wp->pipe_event);
1.1 nicm 68: close(wp->pipe_fd);
69: wp->pipe_fd = -1;
70: }
71:
72: /* If no pipe command, that is enough. */
1.17 nicm 73: if (args->argc == 0 || *args->argv[0] == '\0')
1.22 nicm 74: return (CMD_RETURN_NORMAL);
1.1 nicm 75:
76: /*
77: * With -o, only open the new pipe if there was no previous one. This
78: * allows a pipe to be toggled with a single key, for example:
79: *
80: * bind ^p pipep -o 'cat >>~/output'
81: */
1.17 nicm 82: if (args_has(self->args, 'o') && old_fd != -1)
1.22 nicm 83: return (CMD_RETURN_NORMAL);
1.1 nicm 84:
85: /* Open the new pipe. */
1.4 nicm 86: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
1.25 nicm 87: cmdq_error(cmdq, "socketpair error: %s", strerror(errno));
1.22 nicm 88: return (CMD_RETURN_ERROR);
1.1 nicm 89: }
90:
1.29 nicm 91: /* Expand the command. */
1.32 ! nicm 92: ft = format_create(cmdq, 0);
1.29 nicm 93: format_defaults(ft, c, s, wl, wp);
94: cmd = format_expand_time(ft, args->argv[0], time(NULL));
95: format_free(ft);
96:
1.1 nicm 97: /* Fork the child. */
98: switch (fork()) {
99: case -1:
1.25 nicm 100: cmdq_error(cmdq, "fork error: %s", strerror(errno));
1.29 nicm 101:
102: free(cmd);
1.22 nicm 103: return (CMD_RETURN_ERROR);
1.1 nicm 104: case 0:
105: /* Child process. */
106: close(pipe_fd[0]);
1.15 nicm 107: clear_signals(1);
1.1 nicm 108:
109: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
110: _exit(1);
111: if (pipe_fd[1] != STDIN_FILENO)
112: close(pipe_fd[1]);
113:
114: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
115: if (dup2(null_fd, STDOUT_FILENO) == -1)
116: _exit(1);
117: if (dup2(null_fd, STDERR_FILENO) == -1)
118: _exit(1);
119: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
120: close(null_fd);
121:
1.16 nicm 122: closefrom(STDERR_FILENO + 1);
123:
1.29 nicm 124: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 125: _exit(1);
126: default:
127: /* Parent process. */
128: close(pipe_fd[1]);
129:
130: wp->pipe_fd = pipe_fd[0];
1.5 nicm 131: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.9 nicm 132:
1.4 nicm 133: wp->pipe_event = bufferevent_new(wp->pipe_fd,
134: NULL, NULL, cmd_pipe_pane_error_callback, wp);
135: bufferevent_enable(wp->pipe_event, EV_WRITE);
1.9 nicm 136:
1.18 nicm 137: setblocking(wp->pipe_fd, 0);
1.29 nicm 138:
139: free(cmd);
1.22 nicm 140: return (CMD_RETURN_NORMAL);
1.1 nicm 141: }
1.4 nicm 142: }
143:
144: void
1.30 nicm 145: cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
146: __unused short what, void *data)
1.4 nicm 147: {
148: struct window_pane *wp = data;
149:
150: bufferevent_free(wp->pipe_event);
151: close(wp->pipe_fd);
152: wp->pipe_fd = -1;
1.1 nicm 153: }
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