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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 #include <errno.h> |
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27 #include <fcntl.h> |
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28 #include <stdio.h> |
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29 #include <stdlib.h> |
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30 #include <unistd.h> |
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31 #include <sys/types.h> |
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32 #include <sys/stat.h> |
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33 |
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34 #include "childproc.h" |
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35 |
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36 extern int errno; |
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37 |
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38 #define ALLOC(X,Y) { \ |
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39 void *mptr; \ |
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40 mptr = malloc (Y); \ |
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41 if (mptr == 0) { \ |
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42 error (fdout, ERR_MALLOC); \ |
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43 } \ |
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44 X = mptr; \ |
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45 } |
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46 |
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47 #define ERR_MALLOC 1 |
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48 #define ERR_PIPE 2 |
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49 #define ERR_ARGS 3 |
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50 |
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51 void error (int fd, int err) { |
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52 write (fd, &err, sizeof(err)); |
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53 exit (1); |
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54 } |
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55 |
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56 void shutItDown() { |
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57 fprintf(stdout, "This command is not for general use and should "); |
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58 fprintf(stdout, "only be run as the result of a call to\n"); |
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59 fprintf(stdout, "ProcessBuilder.start() or Runtime.exec() in a java "); |
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60 fprintf(stdout, "application\n"); |
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61 _exit(1); |
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62 } |
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63 |
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64 /* |
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65 * read the following off the pipefd |
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66 * - the ChildStuff struct |
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67 * - the SpawnInfo struct |
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68 * - the data strings for fields in ChildStuff |
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69 */ |
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70 void initChildStuff (int fdin, int fdout, ChildStuff *c) { |
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71 int n; |
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72 int argvBytes, nargv, envvBytes, nenvv; |
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73 int dirlen; |
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74 char *buf; |
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75 SpawnInfo sp; |
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76 int bufsize, offset=0; |
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77 int magic; |
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78 int res; |
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79 |
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80 res = readFully (fdin, &magic, sizeof(magic)); |
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81 if (res != 4 || magic != magicNumber()) { |
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82 error (fdout, ERR_PIPE); |
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83 } |
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84 |
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85 if (readFully (fdin, c, sizeof(*c)) == -1) { |
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86 error (fdout, ERR_PIPE); |
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87 } |
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88 |
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89 if (readFully (fdin, &sp, sizeof(sp)) == -1) { |
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90 error (fdout, ERR_PIPE); |
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91 } |
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92 |
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93 bufsize = sp.argvBytes + sp.envvBytes + |
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94 sp.dirlen + sp.parentPathvBytes; |
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95 |
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96 ALLOC(buf, bufsize); |
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97 |
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98 if (readFully (fdin, buf, bufsize) == -1) { |
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99 error (fdout, ERR_PIPE); |
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100 } |
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101 |
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102 /* Initialize argv[] */ |
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103 ALLOC(c->argv, sizeof(char *) * sp.nargv); |
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104 initVectorFromBlock (c->argv, buf+offset, sp.nargv-1); |
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105 offset += sp.argvBytes; |
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106 |
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107 /* Initialize envv[] */ |
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108 if (sp.nenvv == 0) { |
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109 c->envv = 0; |
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110 } else { |
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111 ALLOC(c->envv, sizeof(char *) * sp.nenvv); |
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112 initVectorFromBlock (c->envv, buf+offset, sp.nenvv-1); |
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113 offset += sp.envvBytes; |
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114 } |
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115 |
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116 /* Initialize pdir */ |
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117 if (sp.dirlen == 0) { |
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118 c->pdir = 0; |
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119 } else { |
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120 c->pdir = buf+offset; |
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121 offset += sp.dirlen; |
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122 } |
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123 |
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124 /* Initialize parentPathv[] */ |
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125 ALLOC(parentPathv, sizeof (char *) * sp.nparentPathv) |
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126 initVectorFromBlock ((const char**)parentPathv, buf+offset, sp.nparentPathv-1); |
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127 offset += sp.parentPathvBytes; |
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128 } |
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129 |
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130 int main(int argc, char *argv[]) { |
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131 ChildStuff c; |
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132 int t; |
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133 struct stat buf; |
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134 /* argv[0] contains the fd number to read all the child info */ |
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135 int r, fdin, fdout; |
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136 |
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137 r = sscanf (argv[argc-1], "%d:%d", &fdin, &fdout); |
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138 if (r == 2 && fcntl(fdin, F_GETFD) != -1) { |
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139 fstat(fdin, &buf); |
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140 if (!S_ISFIFO(buf.st_mode)) |
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141 shutItDown(); |
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142 } else { |
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143 shutItDown(); |
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144 } |
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145 initChildStuff (fdin, fdout, &c); |
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146 |
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147 childProcess (&c); |
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148 return 0; /* NOT REACHED */ |
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149 } |