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scoutos / prex-0.9.0 / usr / bin / sh / cmds.c @ 03e9c04a

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/*
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 * Copyright (c) 2005-2006, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/fcntl.h>
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#include <sys/prex.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <setjmp.h>
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#include "sh.h"
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extern char **environ;
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static int cmd_null(int argc, char *argv[]);
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static int cmd_cd(int argc, char *argv[]);
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static int cmd_mem(int argc, char *argv[]);
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static int cmd_exec(int argc, char *argv[]);
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static int cmd_exit(int argc, char *argv[]);
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/*
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 * Internal shell commands
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 */
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const struct cmdentry shell_cmds[] = {
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    { "cd"         ,cmd_cd           },
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    { "exec"       ,cmd_exec         },
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    { "exit"       ,cmd_exit         },
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    { "export"     ,cmd_export       },
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    { "mem"        ,cmd_mem          },
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    { "set"        ,cmd_showvars     },
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    { "unset"      ,cmd_unsetvar     },
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    { NULL         ,cmd_null         },
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};
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static int
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cmd_null(int argc, char *argv[])
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{
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        return 0;
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}
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static int
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cmd_cd(int argc, char *argv[])
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{
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        char *p;
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        if (argc > 2) {
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                fprintf(stderr, "usage: cd [dir]\n");
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                return 0;
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        }
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        if (argc == 1) {
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                p = getenv("HOME");
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                if (p == NULL)
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                        p = "/";
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        } else
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                p = argv[1];
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        if (chdir(p) < 0)
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                return errno;
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        return 0;
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}
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static int
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cmd_exec(int argc, char *argv[])
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{
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        char **envp = environ;
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        if (argc < 2) {
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                fprintf(stderr, "usage: exec command\n");
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                return 0;
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        }
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        close(0);
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        open("/dev/tty", O_RDONLY);
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        /*
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         * Memory size optimization for 'exec sh'.
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         */
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        if (!strcmp(argv[1], "sh")) {
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                longjmp(jmpbuf, 1);
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                /* NOTREACHED */
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        }
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        return execve(argv[1], &argv[2], envp);
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}
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static int
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cmd_mem(int argc, char *argv[])
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{
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        struct meminfo info;
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        sys_info(INFO_MEMORY, &info);
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        /* UNIX v7 style... */
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        printf("mem = %d\n", (u_int)info.total);
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        return 0;
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}
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static int
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cmd_exit(int argc, char *argv[])
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{
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        exit(0);
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        /* NOTREACHED */
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}