| 1 | /* $Id: redirect.c 1577 2008-04-25 00:29:25Z bird $ */
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| 2 | /** @file
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| 3 | * kmk_redirect - Do simple program <-> file redirection (++).
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2007-2008 knut st. osmundsen <[email protected]>
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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 | #ifdef __OS2__
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| 45 | # define INCL_BASE
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| 46 | # include <os2.h>
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| 47 | # ifndef LIBPATHSTRICT
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| 48 | # define LIBPATHSTRICT 3
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| 49 | # endif
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| 50 | #endif
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| 51 |
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| 52 |
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| 53 | static int usage(FILE *pOut, const char *argv0)
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| 54 | {
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| 55 | fprintf(pOut,
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| 56 | "usage: %s [-[rwa+tb]<fd> <file>] [-E <var=val>] [-C <dir>] -- <program> [args]\n"
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| 57 | " or: %s --help\n"
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| 58 | " or: %s --version\n"
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| 59 | "\n"
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| 60 | "The rwa+tb is like for fopen, if not specified it defaults to w+.\n"
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| 61 | "The <fd> is either a number or an alias for the standard handles:\n"
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| 62 | " i = stdin\n"
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| 63 | " o = stdout\n"
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| 64 | " e = stderr\n"
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| 65 | "\n"
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| 66 | "The -E switch is for making changes to the environment in a putenv\n"
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| 67 | "fashion.\n"
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| 68 | "\n"
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| 69 | "The -C switch is for changing the current directory. This takes immediate\n"
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| 70 | "effect, so be careful where you put it.\n"
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| 71 | "\n"
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| 72 | "This command is really just a quick hack to avoid invoking the shell\n"
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| 73 | "on Windows (cygwin) where forking is very expensive and has exhibited\n"
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| 74 | "stability issues on SMP machines. This tool may be retired when kBuild\n"
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| 75 | "starts using the kmk_kash shell.\n"
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| 76 | ,
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| 77 | argv0, argv0, argv0);
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| 78 | return 1;
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| 79 | }
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| 80 |
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| 81 |
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| 82 | int main(int argc, char **argv)
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| 83 | {
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| 84 | int i;
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| 85 | #if defined(_MSC_VER)
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| 86 | intptr_t rc;
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| 87 | #endif
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| 88 | FILE *pStdErr = stderr;
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| 89 | FILE *pStdOut = stdout;
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| 90 |
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| 91 | /*
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| 92 | * Parse arguments.
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| 93 | */
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| 94 | if (argc <= 1)
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| 95 | return usage(pStdErr, argv[0]);
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| 96 | for (i = 1; i < argc; i++)
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| 97 | {
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| 98 | if (argv[i][0] == '-')
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| 99 | {
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| 100 | int fd;
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| 101 | int fdOpened;
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| 102 | int fOpen;
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| 103 | char *psz = &argv[i][1];
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| 104 | if (*psz == '-')
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| 105 | {
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| 106 | /* '--' ? */
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| 107 | if (!psz[1])
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| 108 | {
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| 109 | i++;
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| 110 | break;
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| 111 | }
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| 112 |
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| 113 | /* convert to short. */
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| 114 | if (!strcmp(psz, "-help"))
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| 115 | psz = "h";
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| 116 | else if (!strcmp(psz, "-version"))
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| 117 | psz = "V";
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| 118 | else if (!strcmp(psz, "-env"))
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| 119 | psz = "E";
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| 120 | else if (!strcmp(psz, "-chdir"))
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| 121 | psz = "C";
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| 122 | }
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| 123 |
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| 124 | /*
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| 125 | * Deal with the obligatory help and version switches first.
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| 126 | */
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| 127 | if (*psz == 'h')
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| 128 | {
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| 129 | usage(pStdOut, argv[0]);
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| 130 | return 0;
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| 131 | }
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| 132 | if (*psz == 'V')
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| 133 | {
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| 134 | printf("kmk_redirect - kBuild version %d.%d.%d (r%u)\n"
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| 135 | "Copyright (C) 2007-2008 Knut St. Osmundsen\n",
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| 136 | KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH,
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| 137 | KBUILD_SVN_REV);
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| 138 | return 0;
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| 139 | }
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| 140 |
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| 141 | /*
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| 142 | * Environment switch?
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| 143 | */
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| 144 | if (*psz == 'E')
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| 145 | {
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| 146 | psz++;
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| 147 | if (*psz == ':' || *psz == '=')
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| 148 | psz++;
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| 149 | else
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| 150 | {
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| 151 | if (i + 1 >= argc)
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| 152 | {
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| 153 | fprintf(pStdErr, "%s: syntax error: no argument for %s\n", argv[0], argv[i]);
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| 154 | return 1;
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| 155 | }
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| 156 | psz = argv[++i];
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| 157 | }
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| 158 | #ifdef __OS2__
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| 159 | if ( !strncmp(psz, "BEGINLIBPATH=", sizeof("BEGINLIBPATH=") - 1)
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| 160 | || !strncmp(psz, "ENDLIBPATH=", sizeof("ENDLIBPATH=") - 1)
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| 161 | || !strncmp(psz, "LIBPATHSTRICT=", sizeof("LIBPATHSTRICT=") - 1))
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| 162 | {
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| 163 | ULONG ulVar = *psz == 'B' ? BEGIN_LIBPATH
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| 164 | : *psz == 'E' ? END_LIBPATH
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| 165 | : LIBPATHSTRICT;
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| 166 | const char *pszVal = strchr(psz, '=') + 1;
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| 167 | APIRET rc = DosSetExtLIBPATH(pszVal, ulVar);
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| 168 | if (rc)
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| 169 | {
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| 170 | fprintf(pStdErr, "%s: error: DosSetExtLibPath(\"%s\", %.*s (%lu)): %lu\n",
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| 171 | argv[0], pszVal, pszVal - psz - 1, psz, ulVar, rc);
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| 172 | return 1;
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| 173 | }
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| 174 | }
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| 175 | else
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| 176 | #endif /* __OS2__ */
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| 177 | if (putenv(psz))
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| 178 | {
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| 179 | fprintf(pStdErr, "%s: error: putenv(\"%s\"): %s\n", argv[0], psz, strerror(errno));
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| 180 | return 1;
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| 181 | }
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| 182 | continue;
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| 183 | }
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| 184 |
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| 185 | /*
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| 186 | * Change directory switch?
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| 187 | */
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| 188 | if (*psz == 'C')
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| 189 | {
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| 190 | psz++;
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| 191 | if (*psz == ':' || *psz == '=')
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| 192 | psz++;
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| 193 | else
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| 194 | {
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| 195 | if (i + 1 >= argc)
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| 196 | {
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| 197 | fprintf(pStdErr, "%s: syntax error: no argument for %s\n", argv[0], argv[i]);
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| 198 | return 1;
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| 199 | }
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| 200 | psz = argv[++i];
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| 201 | }
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| 202 | if (!chdir(psz))
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| 203 | continue;
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| 204 | #ifdef _MSC_VER
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| 205 | {
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| 206 | /* drop trailing slash if any. */
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| 207 | size_t cch = strlen(psz);
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| 208 | if ( cch > 2
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| 209 | && (psz[cch - 1] == '/' || psz[cch - 1] == '\\')
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| 210 | && psz[cch - 1] != ':')
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| 211 | {
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| 212 | int rc2;
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| 213 | char *pszCopy = strdup(psz);
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| 214 | do pszCopy[--cch] = '\0';
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| 215 | while ( cch > 2
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| 216 | && (pszCopy[cch - 1] == '/' || pszCopy[cch - 1] == '\\')
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| 217 | && pszCopy[cch - 1] != ':');
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| 218 | rc2 = chdir(pszCopy);
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| 219 | free(pszCopy);
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| 220 | if (!rc2)
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| 221 | continue;
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| 222 | }
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| 223 | }
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| 224 | #endif
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| 225 | fprintf(pStdErr, "%s: error: chdir(\"%s\"): %s\n", argv[0], psz, strerror(errno));
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| 226 | return 1;
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| 227 | }
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| 228 |
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| 229 | /*
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| 230 | * Parse a file descriptor argument.
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| 231 | */
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| 232 |
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| 233 | /* mode */
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| 234 | switch (*psz)
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| 235 | {
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| 236 | case 'r':
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| 237 | psz++;
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| 238 | if (*psz == '+')
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| 239 | {
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| 240 | fOpen = O_RDWR;
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| 241 | psz++;
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| 242 | }
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| 243 | else
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| 244 | fOpen = O_RDONLY;
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| 245 | break;
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| 246 |
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| 247 | case 'w':
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| 248 | psz++;
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| 249 | if (*psz == '+')
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| 250 | {
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| 251 | psz++;
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| 252 | fOpen = O_RDWR | O_CREAT | O_TRUNC;
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| 253 | }
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| 254 | else
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| 255 | fOpen = O_WRONLY | O_CREAT | O_TRUNC;
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| 256 | break;
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| 257 |
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| 258 | case 'a':
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| 259 | psz++;
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| 260 | if (*psz == '+')
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| 261 | {
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| 262 | psz++;
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| 263 | fOpen = O_RDWR | O_CREAT | O_APPEND;
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| 264 | }
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| 265 | else
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| 266 | fOpen = O_WRONLY | O_CREAT | O_APPEND;
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| 267 | break;
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| 268 |
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| 269 | case 'i': /* make sure stdin is read-only. */
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| 270 | fOpen = O_RDONLY;
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| 271 | break;
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| 272 |
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| 273 | case '+':
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| 274 | fprintf(pStdErr, "%s: syntax error: Unexpected '+' in '%s'\n", argv[0], argv[i]);
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| 275 | return 1;
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| 276 |
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| 277 | default:
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| 278 | fOpen = O_RDWR | O_CREAT | O_TRUNC;
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| 279 | break;
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| 280 | }
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| 281 |
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| 282 | /* binary / text modifiers */
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| 283 | switch (*psz)
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| 284 | {
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| 285 | case 'b':
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| 286 | #ifdef O_BINARY
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| 287 | fOpen |= O_BINARY;
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| 288 | #endif
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| 289 | psz++;
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| 290 | break;
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| 291 |
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| 292 | case 't':
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| 293 | #ifdef O_TEXT
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| 294 | fOpen |= O_TEXT;
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| 295 | #endif
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| 296 | psz++;
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| 297 | break;
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| 298 |
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| 299 | default:
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| 300 | #ifdef O_BINARY
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| 301 | fOpen |= O_BINARY;
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| 302 | #endif
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| 303 | break;
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| 304 |
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| 305 | }
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| 306 |
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| 307 | /* convert to file descriptor number */
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| 308 | switch (*psz)
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| 309 | {
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| 310 | case 'i':
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| 311 | fd = 0;
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| 312 | psz++;
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| 313 | break;
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| 314 |
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| 315 | case 'o':
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| 316 | fd = 1;
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| 317 | psz++;
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| 318 | break;
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| 319 |
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| 320 | case 'e':
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| 321 | fd = 2;
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| 322 | psz++;
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| 323 | break;
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| 324 |
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| 325 | case '0':
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| 326 | if (!psz[1])
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| 327 | {
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| 328 | fd = 0;
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| 329 | psz++;
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| 330 | break;
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| 331 | }
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| 332 | case '1':
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| 333 | case '2':
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| 334 | case '3':
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| 335 | case '4':
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| 336 | case '5':
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| 337 | case '6':
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| 338 | case '7':
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| 339 | case '8':
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| 340 | case '9':
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| 341 | fd = (int)strtol(psz, &psz, 0);
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| 342 | if (!fd)
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| 343 | {
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| 344 | fprintf(pStdErr, "%s: error: failed to convert '%s' to a number\n", argv[0], argv[i]);
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| 345 | return 1;
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| 346 |
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| 347 | }
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| 348 | if (fd < 0)
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| 349 | {
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| 350 | fprintf(pStdErr, "%s: error: negative fd %d (%s)\n", argv[0], fd, argv[i]);
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| 351 | return 1;
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| 352 | }
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| 353 | break;
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| 354 |
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| 355 | /*
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| 356 | * Invalid argument.
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| 357 | */
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| 358 | default:
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| 359 | fprintf(pStdErr, "%s: error: failed to convert '%s' ('%s') to a file descriptor\n", argv[0], psz, argv[i]);
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| 360 | return 1;
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| 361 | }
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| 362 |
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| 363 | /*
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| 364 | * Check for the filename.
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| 365 | */
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| 366 | if (*psz)
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| 367 | {
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| 368 | if (*psz != ':' && *psz != '=')
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| 369 | {
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| 370 | fprintf(pStdErr, "%s: syntax error: characters following the file descriptor: '%s' ('%s')\n", argv[0], psz, argv[i]);
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| 371 | return 1;
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| 372 | }
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| 373 | psz++;
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| 374 | }
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| 375 | else
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| 376 | {
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| 377 | i++;
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| 378 | if (i >= argc)
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| 379 | {
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| 380 | fprintf(pStdErr, "%s: syntax error: missing filename argument.\n", argv[0]);
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| 381 | return 1;
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| 382 | }
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| 383 | psz = argv[i];
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| 384 | }
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| 385 |
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| 386 | /*
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| 387 | * Setup the redirection.
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| 388 | */
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| 389 | if (fd == fileno(pStdErr))
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| 390 | {
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| 391 | /*
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| 392 | * Move stderr to a new location, making it close on exec.
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| 393 | * If pStdOut has already teamed up with pStdErr, update it too.
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| 394 | */
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| 395 | FILE *pNew;
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| 396 | fdOpened = dup(fileno(pStdErr));
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| 397 | if (fdOpened == -1)
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| 398 | {
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| 399 | fprintf(pStdErr, "%s: error: failed to dup stderr (%d): %s\n", argv[0], fileno(pStdErr), strerror(errno));
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| 400 | return 1;
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| 401 | }
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| 402 | #ifdef _MSC_VER
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| 403 | /** @todo figure out how to make the handle close-on-exec. We'll simply close it for now.
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| 404 | * SetHandleInformation + set FNOINHERIT in CRT.
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| 405 | */
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| 406 | #else
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| 407 | if (fcntl(fdOpened, F_SETFD, FD_CLOEXEC) == -1)
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| 408 | {
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| 409 | fprintf(pStdErr, "%s: error: failed to make stderr (%d) close-on-exec: %s\n", argv[0], fdOpened, strerror(errno));
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| 410 | return 1;
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| 411 | }
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| 412 | #endif
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| 413 |
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| 414 | pNew = fdopen(fdOpened, "w");
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| 415 | if (!pNew)
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| 416 | {
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| 417 | fprintf(pStdErr, "%s: error: failed to fdopen the new stderr (%d): %s\n", argv[0], fdOpened, strerror(errno));
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| 418 | return 1;
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| 419 | }
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| 420 | if (pStdOut == pStdErr)
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| 421 | pStdOut = pNew;
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| 422 | pStdErr = pNew;
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| 423 | }
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| 424 | else if (fd == 1 && pStdOut != pStdErr)
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| 425 | pStdOut = pStdErr;
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| 426 |
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| 427 | /*
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| 428 | * Close and open the new file descriptor.
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| 429 | */
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| 430 | close(fd);
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| 431 | #if defined(_MSC_VER)
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| 432 | if (!strcmp(psz, "/dev/null"))
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| 433 | psz = (char *)"nul";
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| 434 | #endif
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| 435 | fdOpened = open(psz, fOpen, 0666);
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| 436 | if (fdOpened == -1)
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| 437 | {
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| 438 | fprintf(pStdErr, "%s: error: failed to open '%s' as %d: %s\n", argv[0], psz, fd, strerror(errno));
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| 439 | return 1;
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| 440 | }
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| 441 | if (fdOpened != fd)
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| 442 | {
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| 443 | /* move it (dup2 returns 0 on MSC). */
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| 444 | if (dup2(fdOpened, fd) == -1)
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| 445 | {
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| 446 | fprintf(pStdErr, "%s: error: failed to dup '%s' as %d: %s\n", argv[0], psz, fd, strerror(errno));
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| 447 | return 1;
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| 448 | }
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|---|
| 449 | close(fdOpened);
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|---|
| 450 | }
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|---|
| 451 | }
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|---|
| 452 | else
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|---|
| 453 | {
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|---|
| 454 | fprintf(pStdErr, "%s: syntax error: Invalid argument '%s'.\n", argv[0], argv[i]);
|
|---|
| 455 | return usage(pStdErr, argv[0]);
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|---|
| 456 | }
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|---|
| 457 | }
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|---|
| 458 |
|
|---|
| 459 | /*
|
|---|
| 460 | * Make sure there's something to execute.
|
|---|
| 461 | */
|
|---|
| 462 | if (i >= argc)
|
|---|
| 463 | {
|
|---|
| 464 | fprintf(pStdErr, "%s: syntax error: nothing to execute!\n", argv[0]);
|
|---|
| 465 | return usage(pStdErr, argv[0]);
|
|---|
| 466 | }
|
|---|
| 467 |
|
|---|
| 468 | #if defined(_MSC_VER)
|
|---|
| 469 | /** @todo
|
|---|
| 470 | * We'll have to find the '--' in the commandline and pass that
|
|---|
| 471 | * on to CreateProcess or spawn. Otherwise, the argument qouting
|
|---|
| 472 | * is gonna be messed up.
|
|---|
| 473 | */
|
|---|
| 474 | if (fileno(pStdErr) != 2)
|
|---|
| 475 | fclose(pStdErr);
|
|---|
| 476 | rc = _spawnvp(_P_WAIT, argv[i], &argv[i]);
|
|---|
| 477 | if (rc == -1 && fileno(pStdErr) != 2)
|
|---|
| 478 | {
|
|---|
| 479 | fprintf(pStdErr, "%s: error: _spawnvp(_P_WAIT,%s,..) failed: %s\n", argv[0], argv[i], strerror(errno));
|
|---|
| 480 | rc = 1;
|
|---|
| 481 | }
|
|---|
| 482 | return rc;
|
|---|
| 483 | #else
|
|---|
| 484 | execvp(argv[i], &argv[i]);
|
|---|
| 485 | return 1;
|
|---|
| 486 | #endif
|
|---|
| 487 | }
|
|---|
| 488 |
|
|---|
