root / prex-0.9.0 / usr / bin / sh / cmds.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005-2006, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/fcntl.h> |
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31 | #include <sys/prex.h> |
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32 | |||
33 | #include <unistd.h> |
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34 | #include <errno.h> |
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35 | #include <stdlib.h> |
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36 | #include <stdio.h> |
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37 | #include <string.h> |
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38 | #include <setjmp.h> |
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39 | |||
40 | #include "sh.h" |
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41 | |||
42 | extern char **environ; |
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43 | |||
44 | static int cmd_null(int argc, char *argv[]); |
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45 | static int cmd_cd(int argc, char *argv[]); |
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46 | static int cmd_mem(int argc, char *argv[]); |
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47 | static int cmd_exec(int argc, char *argv[]); |
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48 | static int cmd_exit(int argc, char *argv[]); |
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49 | |||
50 | /*
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51 | * Internal shell commands
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52 | */
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53 | const struct cmdentry shell_cmds[] = { |
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54 | { "cd" ,cmd_cd },
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55 | { "exec" ,cmd_exec },
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56 | { "exit" ,cmd_exit },
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57 | { "export" ,cmd_export },
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58 | { "mem" ,cmd_mem },
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59 | { "set" ,cmd_showvars },
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60 | { "unset" ,cmd_unsetvar },
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61 | { NULL ,cmd_null },
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62 | }; |
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63 | |||
64 | |||
65 | static int |
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66 | cmd_null(int argc, char *argv[]) |
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67 | { |
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68 | return 0; |
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69 | } |
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70 | |||
71 | static int |
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72 | cmd_cd(int argc, char *argv[]) |
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73 | { |
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74 | char *p;
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75 | |||
76 | if (argc > 2) { |
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77 | fprintf(stderr, "usage: cd [dir]\n");
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78 | return 0; |
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79 | } |
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80 | if (argc == 1) { |
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81 | p = getenv("HOME");
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82 | if (p == NULL) |
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83 | p = "/";
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84 | } else
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85 | p = argv[1];
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86 | |||
87 | if (chdir(p) < 0) |
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88 | return errno;
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89 | return 0; |
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90 | } |
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91 | |||
92 | static int |
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93 | cmd_exec(int argc, char *argv[]) |
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94 | { |
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95 | char **envp = environ;
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96 | |||
97 | if (argc < 2) { |
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98 | fprintf(stderr, "usage: exec command\n");
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99 | return 0; |
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100 | } |
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101 | |||
102 | close(0);
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103 | open("/dev/tty", O_RDONLY);
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104 | |||
105 | /*
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106 | * Memory size optimization for 'exec sh'.
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107 | */
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108 | if (!strcmp(argv[1], "sh")) { |
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109 | longjmp(jmpbuf, 1);
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110 | /* NOTREACHED */
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111 | } |
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112 | return execve(argv[1], &argv[2], envp); |
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113 | } |
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114 | |||
115 | static int |
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116 | cmd_mem(int argc, char *argv[]) |
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117 | { |
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118 | struct meminfo info;
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119 | |||
120 | sys_info(INFO_MEMORY, &info); |
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121 | |||
122 | /* UNIX v7 style... */
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123 | printf("mem = %d\n", (u_int)info.total);
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124 | return 0; |
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125 | } |
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126 | |||
127 | static int |
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128 | cmd_exit(int argc, char *argv[]) |
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129 | { |
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130 | |||
131 | exit(0);
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132 | /* NOTREACHED */
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133 | } |