1 /* $Id: cmd-pipe-pane.c,v 1.1.1.2 2011/08/17 18:40:04 jmmv 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 <string.h> 25 #include <time.h> 26 #include <unistd.h> 27 28 #include "tmux.h" 29 30 /* 31 * Open pipe to redirect pane output. If already open, close first. 32 */ 33 34 int cmd_pipe_pane_exec(struct cmd *, struct cmd_ctx *); 35 36 void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *); 37 38 const struct cmd_entry cmd_pipe_pane_entry = { 39 "pipe-pane", "pipep", 40 "ot:", 0, 1, 41 CMD_TARGET_PANE_USAGE "[-o] [command]", 42 0, 43 NULL, 44 NULL, 45 cmd_pipe_pane_exec 46 }; 47 48 int 49 cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx) 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 ((c = cmd_find_client(ctx, NULL)) == NULL) 58 return (-1); 59 60 if (cmd_find_pane(ctx, args_get(args, 't'), NULL, &wp) == NULL) 61 return (-1); 62 63 /* Destroy the old pipe. */ 64 old_fd = wp->pipe_fd; 65 if (wp->pipe_fd != -1) { 66 bufferevent_free(wp->pipe_event); 67 close(wp->pipe_fd); 68 wp->pipe_fd = -1; 69 } 70 71 /* If no pipe command, that is enough. */ 72 if (args->argc == 0 || *args->argv[0] == '\0') 73 return (0); 74 75 /* 76 * With -o, only open the new pipe if there was no previous one. This 77 * allows a pipe to be toggled with a single key, for example: 78 * 79 * bind ^p pipep -o 'cat >>~/output' 80 */ 81 if (args_has(self->args, 'o') && old_fd != -1) 82 return (0); 83 84 /* Open the new pipe. */ 85 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) { 86 ctx->error(ctx, "socketpair error: %s", strerror(errno)); 87 return (-1); 88 } 89 90 /* Fork the child. */ 91 switch (fork()) { 92 case -1: 93 ctx->error(ctx, "fork error: %s", strerror(errno)); 94 return (-1); 95 case 0: 96 /* Child process. */ 97 close(pipe_fd[0]); 98 clear_signals(1); 99 100 if (dup2(pipe_fd[1], STDIN_FILENO) == -1) 101 _exit(1); 102 if (pipe_fd[1] != STDIN_FILENO) 103 close(pipe_fd[1]); 104 105 null_fd = open(_PATH_DEVNULL, O_WRONLY, 0); 106 if (dup2(null_fd, STDOUT_FILENO) == -1) 107 _exit(1); 108 if (dup2(null_fd, STDERR_FILENO) == -1) 109 _exit(1); 110 if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO) 111 close(null_fd); 112 113 closefrom(STDERR_FILENO + 1); 114 115 command = status_replace( 116 c, NULL, NULL, NULL, args->argv[0], time(NULL), 0); 117 execl(_PATH_BSHELL, "sh", "-c", command, (char *) NULL); 118 _exit(1); 119 default: 120 /* Parent process. */ 121 close(pipe_fd[1]); 122 123 wp->pipe_fd = pipe_fd[0]; 124 wp->pipe_off = EVBUFFER_LENGTH(wp->event->input); 125 126 wp->pipe_event = bufferevent_new(wp->pipe_fd, 127 NULL, NULL, cmd_pipe_pane_error_callback, wp); 128 bufferevent_enable(wp->pipe_event, EV_WRITE); 129 130 setblocking(wp->pipe_fd, 0); 131 return (0); 132 } 133 } 134 135 /* ARGSUSED */ 136 void 137 cmd_pipe_pane_error_callback( 138 unused struct bufferevent *bufev, unused short what, void *data) 139 { 140 struct window_pane *wp = data; 141 142 bufferevent_free(wp->pipe_event); 143 close(wp->pipe_fd); 144 wp->pipe_fd = -1; 145 } 146