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Annotation of embedaddon/tmux/cmd-pipe-pane.c, revision 1.1.1.1

1.1       misho       1: /* $OpenBSD$ */
                      2: 
                      3: /*
                      4:  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
                      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 <stdlib.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: static enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmdq_item *);
                     36: 
                     37: static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
                     38: 
                     39: const struct cmd_entry cmd_pipe_pane_entry = {
                     40:        .name = "pipe-pane",
                     41:        .alias = "pipep",
                     42: 
                     43:        .args = { "ot:", 0, 1 },
                     44:        .usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]",
                     45: 
                     46:        .tflag = CMD_PANE,
                     47: 
                     48:        .flags = CMD_AFTERHOOK,
                     49:        .exec = cmd_pipe_pane_exec
                     50: };
                     51: 
                     52: static enum cmd_retval
                     53: cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
                     54: {
                     55:        struct args             *args = self->args;
                     56:        struct client           *c = item->state.c;
                     57:        struct window_pane      *wp = item->state.tflag.wp;
                     58:        struct session          *s = item->state.tflag.s;
                     59:        struct winlink          *wl = item->state.tflag.wl;
                     60:        char                    *cmd;
                     61:        int                      old_fd, pipe_fd[2], null_fd;
                     62:        struct format_tree      *ft;
                     63: 
                     64:        /* Destroy the old pipe. */
                     65:        old_fd = wp->pipe_fd;
                     66:        if (wp->pipe_fd != -1) {
                     67:                bufferevent_free(wp->pipe_event);
                     68:                close(wp->pipe_fd);
                     69:                wp->pipe_fd = -1;
                     70:        }
                     71: 
                     72:        /* If no pipe command, that is enough. */
                     73:        if (args->argc == 0 || *args->argv[0] == '\0')
                     74:                return (CMD_RETURN_NORMAL);
                     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:         */
                     82:        if (args_has(self->args, 'o') && old_fd != -1)
                     83:                return (CMD_RETURN_NORMAL);
                     84: 
                     85:        /* Open the new pipe. */
                     86:        if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
                     87:                cmdq_error(item, "socketpair error: %s", strerror(errno));
                     88:                return (CMD_RETURN_ERROR);
                     89:        }
                     90: 
                     91:        /* Expand the command. */
                     92:        ft = format_create(item, FORMAT_NONE, 0);
                     93:        format_defaults(ft, c, s, wl, wp);
                     94:        cmd = format_expand_time(ft, args->argv[0], time(NULL));
                     95:        format_free(ft);
                     96: 
                     97:        /* Fork the child. */
                     98:        switch (fork()) {
                     99:        case -1:
                    100:                cmdq_error(item, "fork error: %s", strerror(errno));
                    101: 
                    102:                free(cmd);
                    103:                return (CMD_RETURN_ERROR);
                    104:        case 0:
                    105:                /* Child process. */
                    106:                close(pipe_fd[0]);
                    107:                clear_signals(1);
                    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: 
                    122:                closefrom(STDERR_FILENO + 1);
                    123: 
                    124:                execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
                    125:                _exit(1);
                    126:        default:
                    127:                /* Parent process. */
                    128:                close(pipe_fd[1]);
                    129: 
                    130:                wp->pipe_fd = pipe_fd[0];
                    131:                wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
                    132: 
                    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);
                    136: 
                    137:                setblocking(wp->pipe_fd, 0);
                    138: 
                    139:                free(cmd);
                    140:                return (CMD_RETURN_NORMAL);
                    141:        }
                    142: }
                    143: 
                    144: static void
                    145: cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
                    146:     __unused short what, void *data)
                    147: {
                    148:        struct window_pane      *wp = data;
                    149: 
                    150:        bufferevent_free(wp->pipe_event);
                    151:        close(wp->pipe_fd);
                    152:        wp->pipe_fd = -1;
                    153: }