getterm.c

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/*
 * Copyright (c) 2009 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <task.h>
#include <str_error.h>
#include <errno.h>
#include "version.h"
#include "welcome.h"

#define APP_NAME  "getterm"

static void usage(void)
{
        printf("Usage: %s <terminal> [-w] <command> [<arguments...>]\n", APP_NAME);
}

static void reopen(FILE **stream, int fd, const char *path, int flags, const char *mode)
{
        if (fclose(*stream))
                return;
        
        *stream = NULL;
        
        int oldfd = open(path, flags);
        if (oldfd < 0)
                return;
        
        if (oldfd != fd) {
                if (dup2(oldfd, fd) != fd)
                        return;
                
                if (close(oldfd))
                        return;
        }
        
        *stream = fdopen(fd, mode);
}

int main(int argc, char *argv[])
{
        int rc;
        task_exit_t texit;
        int retval;
        task_id_t id;
        char *fname, *term;
        char **cmd_args;
        bool print_wmsg;

        argv++;
        argc--;
        if (argc < 1) {
                usage();
                return -1;
        }

        if (str_cmp(*argv, "-w") == 0) {
                print_wmsg = true;
                argv++;
                argc--;
        } else {
                print_wmsg = false;
        }

        if (argc < 2) {
                usage();
                return -1;
        }

        term = *argv++;
        fname = *argv;
        cmd_args = argv;
        
        reopen(&stdin, 0, term, O_RDONLY, "r");
        reopen(&stdout, 1, term, O_WRONLY, "w");
        reopen(&stderr, 2, term, O_WRONLY, "w");
        
        /*
         * FIXME: fdopen() should actually detect that we are opening a console
         * and it should set line-buffering mode automatically.
         */
        setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
        
        if (stdin == NULL)
                return -2;
        
        if (stdout == NULL)
                return -3;
        
        if (stderr == NULL)
                return -4;
        
        version_print(term);
        if (print_wmsg)
                welcome_msg_print();

        rc = task_spawnv(&id, fname, (const char * const *) cmd_args);
        if (rc != EOK) {
                printf("%s: Error spawning %s (%s)\n", APP_NAME, fname,
                    str_error(rc));
                return -5;
        }

        rc = task_wait(id, &texit, &retval);
        if (rc != EOK) {
                printf("%s: Error waiting for %s (%s)\n", APP_NAME, fname,
                    str_error(rc));
                return -6;
        }

        return 0;
}

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