1 /* $OpenBSD: cmd-pipe-pane.c,v 1.26 2013/10/10 12:00:21 nicm Exp $ */ 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> 20 #include <sys/socket.h> 21 22 #include <errno.h> 23 #include <fcntl.h> 24 #include <paths.h> 25 #include <string.h> 26 #include <time.h> 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 enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmd_q *); 36 37 void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *); 38 39 const struct cmd_entry cmd_pipe_pane_entry = { 40 "pipe-pane", "pipep", 41 "ot:", 0, 1, 42 "[-o] " CMD_TARGET_PANE_USAGE " [command]", 43 0, 44 NULL, 45 cmd_pipe_pane_exec 46 }; 47 48 enum cmd_retval 49 cmd_pipe_pane_exec(struct cmd *self, struct cmd_q *cmdq) 50 { 51 struct args *args = self->args; 52 struct client *c; 53 struct window_pane *wp; 54 char *command; 55 int old_fd, pipe_fd[2], null_fd; 56 57 if (cmd_find_pane(cmdq, args_get(args, 't'), NULL, &wp) == NULL) 58 return (CMD_RETURN_ERROR); 59 c = cmd_find_client(cmdq, NULL, 1); 60 61 /* Destroy the old pipe. */ 62 old_fd = wp->pipe_fd; 63 if (wp->pipe_fd != -1) { 64 bufferevent_free(wp->pipe_event); 65 close(wp->pipe_fd); 66 wp->pipe_fd = -1; 67 } 68 69 /* If no pipe command, that is enough. */ 70 if (args->argc == 0 || *args->argv[0] == '\0') 71 return (CMD_RETURN_NORMAL); 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 */ 79 if (args_has(self->args, 'o') && old_fd != -1) 80 return (CMD_RETURN_NORMAL); 81 82 /* Open the new pipe. */ 83 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) { 84 cmdq_error(cmdq, "socketpair error: %s", strerror(errno)); 85 return (CMD_RETURN_ERROR); 86 } 87 88 /* Fork the child. */ 89 switch (fork()) { 90 case -1: 91 cmdq_error(cmdq, "fork error: %s", strerror(errno)); 92 return (CMD_RETURN_ERROR); 93 case 0: 94 /* Child process. */ 95 close(pipe_fd[0]); 96 clear_signals(1); 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); 110 111 closefrom(STDERR_FILENO + 1); 112 113 command = status_replace( 114 c, NULL, NULL, NULL, args->argv[0], time(NULL), 0); 115 execl(_PATH_BSHELL, "sh", "-c", command, (char *) NULL); 116 _exit(1); 117 default: 118 /* Parent process. */ 119 close(pipe_fd[1]); 120 121 wp->pipe_fd = pipe_fd[0]; 122 wp->pipe_off = EVBUFFER_LENGTH(wp->event->input); 123 124 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); 127 128 setblocking(wp->pipe_fd, 0); 129 return (CMD_RETURN_NORMAL); 130 } 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; 142 } 143