usr/bin/sh/cmds.c

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This source file includes following definitions.
cmd_null
cmd_cd
cmd_exec
cmd_mem
cmd_exit
   1 /*
   2  * Copyright (c) 2005-2006, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 
  30 #include <sys/fcntl.h>
  31 #include <sys/prex.h>
  32 
  33 #include <unistd.h>
  34 #include <errno.h>
  35 #include <stdlib.h>
  36 #include <stdio.h>
  37 #include <string.h>
  38 #include <setjmp.h>
  39 
  40 #include "sh.h"
  41 
  42 extern char **environ;
  43 
  44 static int cmd_null(int argc, char *argv[]);
  45 static int cmd_cd(int argc, char *argv[]);
  46 static int cmd_mem(int argc, char *argv[]);
  47 static int cmd_exec(int argc, char *argv[]);
  48 static int cmd_exit(int argc, char *argv[]);
  49 
  50 /*
  51  * Internal shell commands
  52  */
  53 const struct cmdentry shell_cmds[] = {
  54     { "cd"         ,cmd_cd           },
  55     { "exec"       ,cmd_exec         },
  56     { "exit"       ,cmd_exit         },
  57     { "export"     ,cmd_export       },
  58     { "mem"        ,cmd_mem          },
  59     { "set"        ,cmd_showvars     },
  60     { "unset"      ,cmd_unsetvar     },
  61     { NULL         ,cmd_null         },
  62 };
  63 
  64 
  65 static int
  66 cmd_null(int argc, char *argv[])
  67 {
  68         return 0;
  69 }
  70 
  71 static int
  72 cmd_cd(int argc, char *argv[])
  73 {
  74         char *p;
  75 
  76         if (argc > 2) {
  77                 fprintf(stderr, "usage: cd [dir]\n");
  78                 return 0;
  79         }
  80         if (argc == 1) {
  81                 p = getenv("HOME");
  82                 if (p == NULL)
  83                         p = "/";
  84         } else
  85                 p = argv[1];
  86 
  87         if (chdir(p) < 0)
  88                 return errno;
  89         return 0;
  90 }
  91 
  92 static int
  93 cmd_exec(int argc, char *argv[])
  94 {
  95         char **envp = environ;
  96 
  97         if (argc < 2) {
  98                 fprintf(stderr, "usage: exec command\n");
  99                 return 0;
 100         }
 101 
 102         close(0);
 103         open("/dev/tty", O_RDONLY);
 104 
 105         /*
 106          * Memory size optimization for 'exec sh'.
 107          */
 108         if (!strcmp(argv[1], "sh")) {
 109                 longjmp(jmpbuf, 1);
 110                 /* NOTREACHED */
 111         }
 112         return execve(argv[1], &argv[2], envp);
 113 }
 114 
 115 static int
 116 cmd_mem(int argc, char *argv[])
 117 {
 118         struct meminfo info;
 119 
 120         sys_info(INFO_MEMORY, &info);
 121 
 122         /* UNIX v7 style... */
 123         printf("mem = %d\n", (u_int)info.total);
 124         return 0;
 125 }
 126 
 127 static int
 128 cmd_exit(int argc, char *argv[])
 129 {
 130 
 131         exit(0);
 132         /* NOTREACHED */
 133 }
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root/usr/bin/sh/cmds.c

DEFINITIONS
