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Annotation of src/usr.bin/tmux/cmd-pipe-pane.c, Revision 1.1

1.1     ! nicm        1: /* $OpenBSD: cmd-select-pane.c,v 1.7 2009/07/30 13:45:56 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:
        !            21: #include <errno.h>
        !            22: #include <fcntl.h>
        !            23: #include <paths.h>
        !            24: #include <string.h>
        !            25: #include <unistd.h>
        !            26:
        !            27: #include "tmux.h"
        !            28:
        !            29: /*
        !            30:  * Open pipe to redirect pane output. If already open, close first.
        !            31:  */
        !            32:
        !            33: int    cmd_pipe_pane_exec(struct cmd *, struct cmd_ctx *);
        !            34:
        !            35: const struct cmd_entry cmd_pipe_pane_entry = {
        !            36:        "pipe-pane", "pipep",
        !            37:        CMD_TARGET_PANE_USAGE "[-o] [command]",
        !            38:        CMD_ARG01, CMD_CHFLAG('o'),
        !            39:        cmd_target_init,
        !            40:        cmd_target_parse,
        !            41:        cmd_pipe_pane_exec,
        !            42:        cmd_target_free,
        !            43:        cmd_target_print
        !            44: };
        !            45:
        !            46: int
        !            47: cmd_pipe_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
        !            48: {
        !            49:        struct cmd_target_data  *data = self->data;
        !            50:        struct winlink          *wl;
        !            51:        struct window_pane      *wp;
        !            52:        int                      old_fd, pipe_fd[2], null_fd, mode;
        !            53:
        !            54:        if ((wl = cmd_find_pane(ctx, data->target, NULL, &wp)) == NULL)
        !            55:                return (-1);
        !            56:
        !            57:        /* Destroy the old pipe. */
        !            58:        old_fd = wp->pipe_fd;
        !            59:        if (wp->pipe_fd != -1) {
        !            60:                buffer_destroy(wp->pipe_buf);
        !            61:                close(wp->pipe_fd);
        !            62:                wp->pipe_fd = -1;
        !            63:        }
        !            64:
        !            65:        /* If no pipe command, that is enough. */
        !            66:        if (data->arg == NULL || *data->arg == '\0')
        !            67:                return (0);
        !            68:
        !            69:        /*
        !            70:         * With -o, only open the new pipe if there was no previous one. This
        !            71:         * allows a pipe to be toggled with a single key, for example:
        !            72:         *
        !            73:         *      bind ^p pipep -o 'cat >>~/output'
        !            74:         */
        !            75:        if (data->chflags & CMD_CHFLAG('o') && old_fd != -1)
        !            76:                return (0);
        !            77:
        !            78:        /* Open the new pipe. */
        !            79:        if (pipe(pipe_fd) != 0) {
        !            80:                ctx->error(ctx, "pipe error: %s", strerror(errno));
        !            81:                return (-1);
        !            82:        }
        !            83:
        !            84:        /* Fork the child. */
        !            85:        switch (fork()) {
        !            86:        case -1:
        !            87:                ctx->error(ctx, "fork error: %s", strerror(errno));
        !            88:                return (-1);
        !            89:        case 0:
        !            90:                /* Child process. */
        !            91:                close(pipe_fd[0]);
        !            92:                sigreset();
        !            93:
        !            94:                if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
        !            95:                        _exit(1);
        !            96:                if (pipe_fd[1] != STDIN_FILENO)
        !            97:                        close(pipe_fd[1]);
        !            98:
        !            99:                null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
        !           100:                if (dup2(null_fd, STDOUT_FILENO) == -1)
        !           101:                        _exit(1);
        !           102:                if (dup2(null_fd, STDERR_FILENO) == -1)
        !           103:                        _exit(1);
        !           104:                if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO)
        !           105:                        close(null_fd);
        !           106:
        !           107:                execl(_PATH_BSHELL, "sh", "-c", data->arg, (char *) NULL);
        !           108:                _exit(1);
        !           109:        default:
        !           110:                /* Parent process. */
        !           111:                close(pipe_fd[1]);
        !           112:
        !           113:                wp->pipe_fd = pipe_fd[0];
        !           114:                wp->pipe_buf = buffer_create(BUFSIZ);
        !           115:                wp->pipe_off = BUFFER_USED(wp->in);
        !           116:
        !           117:                if ((mode = fcntl(wp->pipe_fd, F_GETFL)) == -1)
        !           118:                        fatal("fcntl failed");
        !           119:                if (fcntl(wp->pipe_fd, F_SETFL, mode|O_NONBLOCK) == -1)
        !           120:                        fatal("fcntl failed");
        !           121:                if (fcntl(wp->pipe_fd, F_SETFD, FD_CLOEXEC) == -1)
        !           122:                        fatal("fcntl failed");
        !           123:                return (0);
        !           124:        }
        !           125:
        !           126:        return (0);
        !           127: }