| 1 | /* $Id: redirect.c 1308 2007-12-02 02:05:11Z bird $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * kmk_redirect - Do simple program <-> file redirection.
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| 5 | *
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| 6 | * Copyright (c) 2007 knut st. osmundsen <bird-kBuild-spam@anduin.net>
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| 7 | *
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| 8 | *
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| 9 | * This file is part of kBuild.
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| 10 | *
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| 11 | * kBuild is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU General Public License as published by
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| 13 | * the Free Software Foundation; either version 2 of the License, or
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| 14 | * (at your option) any later version.
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| 15 | *
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| 16 | * kBuild is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | * GNU General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with kBuild; if not, write to the Free Software
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| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 24 | *
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*******************************************************************************
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| 29 | * Header Files *
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| 30 | *******************************************************************************/
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| 31 | #include <stdio.h>
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| 32 | #include <stdlib.h>
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| 33 | #include <string.h>
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| 34 | #include <errno.h>
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| 35 | #include <fcntl.h>
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| 36 | #if defined(_MSC_VER)
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| 37 | # include <io.h>
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| 38 | # include <direct.h>
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| 39 | # include <process.h>
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| 40 | #else
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| 41 | # include <unistd.h>
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| 42 | #endif
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| 43 |
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| 44 |
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| 45 |
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| 46 | static int usage(FILE *pOut, const char *argv0)
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| 47 | {
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| 48 | fprintf(pOut,
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| 49 | "usage: %s [-[rwa+tb]<fd> <file>] [-E <var=val>] [-C <dir>] -- <program> [args]\n"
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| 50 | " or: %s --help\n"
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| 51 | " or: %s --version\n"
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| 52 | "\n"
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| 53 | "The rwa+tb is like for fopen, if not specified it defaults to w+.\n"
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| 54 | "The <fd> is either a number or an alias for the standard handles:\n"
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| 55 | " i = stdin\n"
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| 56 | " o = stdout\n"
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| 57 | " e = stderr\n"
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| 58 | "\n"
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| 59 | "The -E switch is for making changes to the environment in a putenv\n"
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| 60 | "fashion.\n"
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| 61 | "\n"
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| 62 | "The -C switch is for changing the current directory. This takes immediate\n"
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| 63 | "effect, so be careful where you put it.\n"
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| 64 | "\n"
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| 65 | "This command is really just a quick hack to avoid invoking the shell\n"
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| 66 | "on Windows (cygwin) where forking is very expensive and has exhibited\n"
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| 67 | "stability issues on SMP machines. This tool may be retired when kBuild\n"
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| 68 | "starts using the kmk_kash shell.\n"
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| 69 | ,
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| 70 | argv0, argv0, argv0);
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| 71 | return 1;
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| 72 | }
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| 73 |
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| 74 |
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| 75 | int main(int argc, char **argv)
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| 76 | {
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| 77 | int i;
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| 78 | #if defined(_MSC_VER)
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| 79 | intptr_t rc;
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| 80 | #endif
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| 81 | FILE *pStdErr = stderr;
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| 82 | FILE *pStdOut = stdout;
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| 83 |
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| 84 | /*
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| 85 | * Parse arguments.
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| 86 | */
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| 87 | if (argc <= 1)
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| 88 | return usage(pStdErr, argv[0]);
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| 89 | for (i = 1; i < argc; i++)
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| 90 | {
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| 91 | if (argv[i][0] == '-')
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| 92 | {
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| 93 | int fd;
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| 94 | int fdOpened;
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| 95 | int fOpen;
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| 96 | char *psz = &argv[i][1];
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| 97 | if (*psz == '-')
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| 98 | {
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| 99 | /* '--' ? */
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| 100 | if (!psz[1])
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| 101 | {
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| 102 | i++;
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| 103 | break;
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| 104 | }
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| 105 |
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| 106 | /* convert to short. */
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| 107 | if (!strcmp(psz, "-help"))
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| 108 | psz = "h";
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| 109 | else if (!strcmp(psz, "-version"))
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| 110 | psz = "V";
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| 111 | else if (!strcmp(psz, "-env"))
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| 112 | psz = "E";
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| 113 | else if (!strcmp(psz, "-chdir"))
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| 114 | psz = "C";
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| 115 | }
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| 116 |
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| 117 | /*
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| 118 | * Deal with the obligatory help and version switches first.
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| 119 | */
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| 120 | if (*psz == 'h')
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| 121 | {
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| 122 | usage(pStdOut, argv[0]);
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| 123 | return 0;
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| 124 | }
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| 125 | if (*psz == 'V')
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| 126 | {
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| 127 | printf("kmk_redirect - kBuild version %d.%d.%d\n"
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| 128 | "Copyright (C) 2007 Knut St. Osmundsen\n",
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| 129 | KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH);
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| 130 | return 0;
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| 131 | }
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| 132 |
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| 133 | /*
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| 134 | * Environment switch?
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| 135 | */
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| 136 | if (*psz == 'E')
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| 137 | {
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| 138 | psz++;
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| 139 | if (*psz == ':' || *psz == '=')
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| 140 | psz++;
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| 141 | else
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| 142 | {
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| 143 | if (i + 1 >= argc)
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| 144 | {
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| 145 | fprintf(pStdErr, "%s: syntax error: no argument for %s\n", argv[0], argv[i]);
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| 146 | return 1;
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| 147 | }
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| 148 | psz = argv[++i];
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| 149 | }
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| 150 | if (putenv(psz))
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| 151 | {
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| 152 | fprintf(pStdErr, "%s: error: putenv(\"%s\"): %s\n", argv[0], psz, strerror(errno));
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| 153 | return 1;
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| 154 | }
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| 155 | continue;
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| 156 | }
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| 157 |
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| 158 | /*
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| 159 | * Change directory switch?
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| 160 | */
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| 161 | if (*psz == 'C')
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| 162 | {
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| 163 | psz++;
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| 164 | if (*psz == ':' || *psz == '=')
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| 165 | psz++;
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| 166 | else
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| 167 | {
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| 168 | if (i + 1 >= argc)
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| 169 | {
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| 170 | fprintf(pStdErr, "%s: syntax error: no argument for %s\n", argv[0], argv[i]);
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| 171 | return 1;
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| 172 | }
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| 173 | psz = argv[++i];
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| 174 | }
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| 175 | if (!chdir(psz))
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| 176 | continue;
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| 177 | #ifdef _MSC_VER
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| 178 | {
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| 179 | /* drop trailing slash if any. */
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| 180 | size_t cch = strlen(psz);
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| 181 | if ( cch > 2
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| 182 | && (psz[cch - 1] == '/' || psz[cch - 1] == '\\')
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| 183 | && psz[cch - 1] != ':')
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| 184 | {
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| 185 | int rc2;
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| 186 | char *pszCopy = strdup(psz);
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| 187 | do pszCopy[--cch] = '\0';
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| 188 | while ( cch > 2
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| 189 | && (pszCopy[cch - 1] == '/' || pszCopy[cch - 1] == '\\')
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| 190 | && pszCopy[cch - 1] != ':');
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| 191 | rc2 = chdir(pszCopy);
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| 192 | free(pszCopy);
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| 193 | if (!rc2)
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| 194 | continue;
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| 195 | }
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| 196 | }
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| 197 | #endif
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| 198 | fprintf(pStdErr, "%s: error: chdir(\"%s\"): %s\n", argv[0], psz, strerror(errno));
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| 199 | return 1;
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| 200 | }
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| 201 |
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| 202 | /*
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| 203 | * Parse a file descriptor argument.
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| 204 | */
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| 205 |
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| 206 | /* mode */
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| 207 | switch (*psz)
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| 208 | {
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| 209 | case 'r':
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| 210 | psz++;
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| 211 | if (*psz == '+')
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| 212 | {
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| 213 | fOpen = O_RDWR;
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| 214 | psz++;
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| 215 | }
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| 216 | else
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| 217 | fOpen = O_RDONLY;
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| 218 | break;
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| 219 |
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| 220 | case 'w':
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| 221 | psz++;
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| 222 | if (*psz == '+')
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| 223 | {
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| 224 | psz++;
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| 225 | fOpen = O_RDWR | O_CREAT | O_TRUNC;
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| 226 | }
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| 227 | else
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| 228 | fOpen = O_WRONLY | O_CREAT | O_TRUNC;
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| 229 | break;
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| 230 |
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| 231 | case 'a':
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| 232 | psz++;
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| 233 | if (*psz == '+')
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| 234 | {
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| 235 | psz++;
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| 236 | fOpen = O_RDWR | O_CREAT | O_APPEND;
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| 237 | }
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| 238 | else
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| 239 | fOpen = O_WRONLY | O_CREAT | O_APPEND;
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| 240 | break;
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| 241 |
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| 242 | case 'i': /* make sure stdin is read-only. */
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| 243 | fOpen = O_RDONLY;
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| 244 | break;
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| 245 |
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| 246 | case '+':
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| 247 | fprintf(pStdErr, "%s: syntax error: Unexpected '+' in '%s'\n", argv[0], argv[i]);
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| 248 | return 1;
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| 249 |
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| 250 | default:
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| 251 | fOpen = O_RDWR | O_CREAT | O_TRUNC;
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| 252 | break;
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| 253 | }
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| 254 |
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| 255 | /* binary / text modifiers */
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| 256 | switch (*psz)
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| 257 | {
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| 258 | case 'b':
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| 259 | #ifdef O_BINARY
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| 260 | fOpen |= O_BINARY;
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| 261 | #endif
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| 262 | psz++;
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| 263 | break;
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| 264 |
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| 265 | case 't':
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| 266 | #ifdef O_TEXT
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| 267 | fOpen |= O_TEXT;
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| 268 | #endif
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| 269 | psz++;
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| 270 | break;
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| 271 |
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| 272 | default:
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| 273 | #ifdef O_BINARY
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| 274 | fOpen |= O_BINARY;
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| 275 | #endif
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| 276 | break;
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| 277 |
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| 278 | }
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| 279 |
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| 280 | /* convert to file descriptor number */
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| 281 | switch (*psz)
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| 282 | {
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| 283 | case 'i':
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| 284 | fd = 0;
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| 285 | psz++;
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| 286 | break;
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| 287 |
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| 288 | case 'o':
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| 289 | fd = 1;
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| 290 | psz++;
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| 291 | break;
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| 292 |
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| 293 | case 'e':
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| 294 | fd = 2;
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| 295 | psz++;
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| 296 | break;
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| 297 |
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| 298 | case '0':
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| 299 | if (!psz[1])
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| 300 | {
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| 301 | fd = 0;
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| 302 | psz++;
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| 303 | break;
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| 304 | }
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| 305 | case '1':
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| 306 | case '2':
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| 307 | case '3':
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| 308 | case '4':
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| 309 | case '5':
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| 310 | case '6':
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| 311 | case '7':
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| 312 | case '8':
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| 313 | case '9':
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| 314 | fd = (int)strtol(psz, &psz, 0);
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| 315 | if (!fd)
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| 316 | {
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| 317 | fprintf(pStdErr, "%s: error: failed to convert '%s' to a number\n", argv[0], argv[i]);
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| 318 | return 1;
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| 319 |
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| 320 | }
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| 321 | if (fd < 0)
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| 322 | {
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| 323 | fprintf(pStdErr, "%s: error: negative fd %d (%s)\n", argv[0], fd, argv[i]);
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| 324 | return 1;
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| 325 | }
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| 326 | break;
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| 327 |
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| 328 | /*
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| 329 | * Invalid argument.
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| 330 | */
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| 331 | default:
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| 332 | fprintf(pStdErr, "%s: error: failed to convert '%s' ('%s') to a file descriptor\n", argv[0], psz, argv[i]);
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| 333 | return 1;
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| 334 | }
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| 335 |
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| 336 | /*
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| 337 | * Check for the filename.
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| 338 | */
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| 339 | if (*psz)
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| 340 | {
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| 341 | if (*psz != ':' && *psz != '=')
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| 342 | {
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| 343 | fprintf(pStdErr, "%s: syntax error: characters following the file descriptor: '%s' ('%s')\n", argv[0], psz, argv[i]);
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| 344 | return 1;
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| 345 | }
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| 346 | psz++;
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| 347 | }
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| 348 | else
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| 349 | {
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| 350 | i++;
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| 351 | if (i >= argc)
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| 352 | {
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| 353 | fprintf(pStdErr, "%s: syntax error: missing filename argument.\n", argv[0]);
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| 354 | return 1;
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| 355 | }
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| 356 | psz = argv[i];
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| 357 | }
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| 358 |
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| 359 | /*
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| 360 | * Setup the redirection.
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| 361 | */
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| 362 | if (fd == fileno(pStdErr))
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| 363 | {
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| 364 | /*
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| 365 | * Move stderr to a new location, making it close on exec.
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| 366 | * If pStdOut has already teamed up with pStdErr, update it too.
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| 367 | */
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| 368 | FILE *pNew;
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| 369 | fdOpened = dup(fileno(pStdErr));
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| 370 | if (fdOpened == -1)
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| 371 | {
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| 372 | fprintf(pStdErr, "%s: error: failed to dup stderr (%d): %s\n", argv[0], fileno(pStdErr), strerror(errno));
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| 373 | return 1;
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| 374 | }
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| 375 | #ifdef _MSC_VER
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| 376 | /** @todo figure out how to make the handle close-on-exec. We'll simply close it for now.
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| 377 | * SetHandleInformation + set FNOINHERIT in CRT.
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| 378 | */
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| 379 | #else
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| 380 | if (fcntl(fdOpened, F_SETFD, FD_CLOEXEC) == -1)
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| 381 | {
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| 382 | fprintf(pStdErr, "%s: error: failed to make stderr (%d) close-on-exec: %s\n", argv[0], fdOpened, strerror(errno));
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| 383 | return 1;
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| 384 | }
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| 385 | #endif
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| 386 |
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| 387 | pNew = fdopen(fdOpened, "w");
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| 388 | if (!pNew)
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| 389 | {
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| 390 | fprintf(pStdErr, "%s: error: failed to fdopen the new stderr (%d): %s\n", argv[0], fdOpened, strerror(errno));
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| 391 | return 1;
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| 392 | }
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| 393 | if (pStdOut == pStdErr)
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| 394 | pStdOut = pNew;
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| 395 | pStdErr = pNew;
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| 396 | }
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| 397 | else if (fd == 1 && pStdOut != pStdErr)
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| 398 | pStdOut = pStdErr;
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| 399 |
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| 400 | /*
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| 401 | * Close and open the new file descriptor.
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| 402 | */
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| 403 | close(fd);
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| 404 | #if defined(_MSC_VER)
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| 405 | if (!strcmp(psz, "/dev/null"))
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| 406 | psz = (char *)"nul";
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| 407 | #endif
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| 408 | fdOpened = open(psz, fOpen, 0666);
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| 409 | if (fdOpened == -1)
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| 410 | {
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| 411 | fprintf(pStdErr, "%s: error: failed to open '%s' as %d: %s\n", argv[0], psz, fd, strerror(errno));
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| 412 | return 1;
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| 413 | }
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| 414 | if (fdOpened != fd)
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| 415 | {
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| 416 | /* move it (dup2 returns 0 on MSC). */
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| 417 | if (dup2(fdOpened, fd) == -1)
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| 418 | {
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| 419 | fprintf(pStdErr, "%s: error: failed to dup '%s' as %d: %s\n", argv[0], psz, fd, strerror(errno));
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| 420 | return 1;
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| 421 | }
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| 422 | close(fdOpened);
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| 423 | }
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| 424 | }
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| 425 | else
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| 426 | {
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| 427 | fprintf(pStdErr, "%s: syntax error: Invalid argument '%s'.\n", argv[0], argv[i]);
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| 428 | return usage(pStdErr, argv[0]);
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| 429 | }
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| 430 | }
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| 431 |
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| 432 | /*
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| 433 | * Make sure there's something to execute.
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| 434 | */
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| 435 | if (i >= argc)
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| 436 | {
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| 437 | fprintf(pStdErr, "%s: syntax error: nothing to execute!\n", argv[0]);
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| 438 | return usage(pStdErr, argv[0]);
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| 439 | }
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| 440 |
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| 441 | #if defined(_MSC_VER)
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| 442 | /** @todo
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| 443 | * We'll have to find the '--' in the commandline and pass that
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| 444 | * on to CreateProcess or spawn. Otherwise, the argument qouting
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| 445 | * is gonna be messed up.
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| 446 | */
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| 447 | if (fileno(pStdErr) != 2)
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| 448 | fclose(pStdErr);
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| 449 | rc = _spawnvp(_P_WAIT, argv[i], &argv[i]);
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| 450 | if (rc == -1 && fileno(pStdErr) != 2)
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| 451 | {
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| 452 | fprintf(pStdErr, "%s: error: _spawnvp(_P_WAIT,%s,..) failed: %s\n", argv[0], argv[i], strerror(errno));
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| 453 | rc = 1;
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| 454 | }
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| 455 | return rc;
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| 456 | #else
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| 457 | execvp(argv[i], &argv[i]);
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| 458 | return 1;
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| 459 | #endif
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| 460 | }
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| 461 |
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