Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.39
1.39 ! nicm 1: /* $OpenBSD: cmd-pipe-pane.c,v 1.38 2016/10/14 22:14:22 nicm Exp $ */
1.1 nicm 2:
3: /*
1.36 nicm 4: * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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:
1.39 ! nicm 36: static enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmdq_item *);
1.1 nicm 37:
1.37 nicm 38: static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
1.4 nicm 39:
1.1 nicm 40: const struct cmd_entry cmd_pipe_pane_entry = {
1.34 nicm 41: .name = "pipe-pane",
42: .alias = "pipep",
43:
44: .args = { "ot:", 0, 1 },
45: .usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]",
46:
1.35 nicm 47: .tflag = CMD_PANE,
48:
1.38 nicm 49: .flags = CMD_AFTERHOOK,
1.34 nicm 50: .exec = cmd_pipe_pane_exec
1.1 nicm 51: };
52:
1.37 nicm 53: static enum cmd_retval
1.39 ! nicm 54: cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
1.1 nicm 55: {
1.17 nicm 56: struct args *args = self->args;
1.39 ! nicm 57: struct client *c = item->state.c;
! 58: struct window_pane *wp = item->state.tflag.wp;
! 59: struct session *s = item->state.tflag.s;
! 60: struct winlink *wl = item->state.tflag.wl;
1.29 nicm 61: char *cmd;
1.18 nicm 62: int old_fd, pipe_fd[2], null_fd;
1.29 nicm 63: struct format_tree *ft;
1.1 nicm 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. */
1.17 nicm 74: if (args->argc == 0 || *args->argv[0] == '\0')
1.22 nicm 75: return (CMD_RETURN_NORMAL);
1.1 nicm 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: */
1.17 nicm 83: if (args_has(self->args, 'o') && old_fd != -1)
1.22 nicm 84: return (CMD_RETURN_NORMAL);
1.1 nicm 85:
86: /* Open the new pipe. */
1.4 nicm 87: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
1.39 ! nicm 88: cmdq_error(item, "socketpair error: %s", strerror(errno));
1.22 nicm 89: return (CMD_RETURN_ERROR);
1.1 nicm 90: }
91:
1.29 nicm 92: /* Expand the command. */
1.39 ! nicm 93: ft = format_create(item, 0);
1.29 nicm 94: format_defaults(ft, c, s, wl, wp);
95: cmd = format_expand_time(ft, args->argv[0], time(NULL));
96: format_free(ft);
97:
1.1 nicm 98: /* Fork the child. */
99: switch (fork()) {
100: case -1:
1.39 ! nicm 101: cmdq_error(item, "fork error: %s", strerror(errno));
1.29 nicm 102:
103: free(cmd);
1.22 nicm 104: return (CMD_RETURN_ERROR);
1.1 nicm 105: case 0:
106: /* Child process. */
107: close(pipe_fd[0]);
1.15 nicm 108: clear_signals(1);
1.1 nicm 109:
110: if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
111: _exit(1);
112: if (pipe_fd[1] != STDIN_FILENO)
113: close(pipe_fd[1]);
114:
115: null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
116: if (dup2(null_fd, STDOUT_FILENO) == -1)
117: _exit(1);
118: if (dup2(null_fd, STDERR_FILENO) == -1)
119: _exit(1);
120: if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
121: close(null_fd);
122:
1.16 nicm 123: closefrom(STDERR_FILENO + 1);
124:
1.29 nicm 125: execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
1.1 nicm 126: _exit(1);
127: default:
128: /* Parent process. */
129: close(pipe_fd[1]);
130:
131: wp->pipe_fd = pipe_fd[0];
1.5 nicm 132: wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
1.9 nicm 133:
1.4 nicm 134: wp->pipe_event = bufferevent_new(wp->pipe_fd,
135: NULL, NULL, cmd_pipe_pane_error_callback, wp);
136: bufferevent_enable(wp->pipe_event, EV_WRITE);
1.9 nicm 137:
1.18 nicm 138: setblocking(wp->pipe_fd, 0);
1.29 nicm 139:
140: free(cmd);
1.22 nicm 141: return (CMD_RETURN_NORMAL);
1.1 nicm 142: }
1.4 nicm 143: }
144:
1.37 nicm 145: static void
1.30 nicm 146: cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
147: __unused short what, void *data)
1.4 nicm 148: {
149: struct window_pane *wp = data;
150:
151: bufferevent_free(wp->pipe_event);
152: close(wp->pipe_fd);
153: wp->pipe_fd = -1;
1.1 nicm 154: }
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