| 1 | /* $Id: redirect.c 1674 2008-07-11 00:49:29Z 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 <bird-kBuild-spam@anduin.net>
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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 const char *name(const char *pszName)
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| 54 | {
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| 55 | const char *psz = strrchr(pszName, '/');
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| 56 | #if defined(_MSC_VER) || defined(__OS2__)
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| 57 | const char *psz2 = strrchr(pszName, '\\');
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| 58 | if (!psz2)
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| 59 | psz2 = strrchr(pszName, ':');
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| 60 | if (psz2 && (!psz || psz2 > psz))
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| 61 | psz = psz2;
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| 62 | #endif
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| 63 | return psz ? psz + 1 : pszName;
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| 64 | }
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| 65 |
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| 66 |
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| 67 | static int usage(FILE *pOut, const char *argv0)
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| 68 | {
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| 69 | fprintf(pOut,
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| 70 | "usage: %s [-[rwa+tb]<fd> <file>] [-E <var=val>] [-C <dir>] -- <program> [args]\n"
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| 71 | " or: %s --help\n"
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| 72 | " or: %s --version\n"
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| 73 | "\n"
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| 74 | "The rwa+tb is like for fopen, if not specified it defaults to w+.\n"
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| 75 | "The <fd> is either a number or an alias for the standard handles:\n"
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| 76 | " i = stdin\n"
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| 77 | " o = stdout\n"
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| 78 | " e = stderr\n"
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| 79 | "\n"
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| 80 | "The -E switch is for making changes to the environment in a putenv\n"
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| 81 | "fashion.\n"
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| 82 | "\n"
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| 83 | "The -C switch is for changing the current directory. This takes immediate\n"
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| 84 | "effect, so be careful where you put it.\n"
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| 85 | "\n"
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| 86 | "This command is really just a quick hack to avoid invoking the shell\n"
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| 87 | "on Windows (cygwin) where forking is very expensive and has exhibited\n"
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| 88 | "stability issues on SMP machines. This tool may be retired when kBuild\n"
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| 89 | "starts using the kmk_kash shell.\n"
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| 90 | ,
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| 91 | argv0, argv0, argv0);
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| 92 | return 1;
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| 93 | }
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| 94 |
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| 95 |
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| 96 | int main(int argc, char **argv)
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| 97 | {
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| 98 | int i;
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| 99 | #if defined(_MSC_VER)
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| 100 | intptr_t rc;
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| 101 | #endif
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| 102 | FILE *pStdErr = stderr;
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| 103 | FILE *pStdOut = stdout;
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| 104 |
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| 105 | /*
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| 106 | * Parse arguments.
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| 107 | */
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| 108 | if (argc <= 1)
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| 109 | return usage(pStdErr, name(argv[0]));
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| 110 | for (i = 1; i < argc; i++)
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| 111 | {
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| 112 | if (argv[i][0] == '-')
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| 113 | {
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| 114 | int fd;
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| 115 | int fdOpened;
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| 116 | int fOpen;
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| 117 | char *psz = &argv[i][1];
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| 118 | if (*psz == '-')
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| 119 | {
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| 120 | /* '--' ? */
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| 121 | if (!psz[1])
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| 122 | {
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| 123 | i++;
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| 124 | break;
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| 125 | }
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| 126 |
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| 127 | /* convert to short. */
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| 128 | if (!strcmp(psz, "-help"))
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| 129 | psz = "h";
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| 130 | else if (!strcmp(psz, "-version"))
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| 131 | psz = "V";
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| 132 | else if (!strcmp(psz, "-env"))
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| 133 | psz = "E";
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| 134 | else if (!strcmp(psz, "-chdir"))
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| 135 | psz = "C";
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| 136 | }
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| 137 |
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| 138 | /*
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| 139 | * Deal with the obligatory help and version switches first.
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| 140 | */
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| 141 | if (*psz == 'h')
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| 142 | {
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| 143 | usage(pStdOut, name(argv[0]));
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| 144 | return 0;
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| 145 | }
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| 146 | if (*psz == 'V')
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| 147 | {
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| 148 | printf("kmk_redirect - kBuild version %d.%d.%d (r%u)\n"
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| 149 | "Copyright (C) 2007-2008 Knut St. Osmundsen\n",
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| 150 | KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH,
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| 151 | KBUILD_SVN_REV);
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| 152 | return 0;
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| 153 | }
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| 154 |
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| 155 | /*
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| 156 | * Environment switch?
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| 157 | */
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| 158 | if (*psz == 'E')
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| 159 | {
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| 160 | psz++;
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| 161 | if (*psz == ':' || *psz == '=')
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| 162 | psz++;
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| 163 | else
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| 164 | {
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| 165 | if (i + 1 >= argc)
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| 166 | {
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| 167 | fprintf(pStdErr, "%s: syntax error: no argument for %s\n", name(argv[0]), argv[i]);
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| 168 | return 1;
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| 169 | }
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| 170 | psz = argv[++i];
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| 171 | }
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| 172 | #ifdef __OS2__
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| 173 | if ( !strncmp(psz, "BEGINLIBPATH=", sizeof("BEGINLIBPATH=") - 1)
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| 174 | || !strncmp(psz, "ENDLIBPATH=", sizeof("ENDLIBPATH=") - 1)
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| 175 | || !strncmp(psz, "LIBPATHSTRICT=", sizeof("LIBPATHSTRICT=") - 1))
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| 176 | {
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| 177 | ULONG ulVar = *psz == 'B' ? BEGIN_LIBPATH
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| 178 | : *psz == 'E' ? END_LIBPATH
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| 179 | : LIBPATHSTRICT;
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| 180 | const char *pszVal = strchr(psz, '=') + 1;
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| 181 | APIRET rc = DosSetExtLIBPATH(pszVal, ulVar);
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| 182 | if (rc)
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| 183 | {
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| 184 | fprintf(pStdErr, "%s: error: DosSetExtLibPath(\"%s\", %.*s (%lu)): %lu\n",
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| 185 | name(argv[0]), pszVal, pszVal - psz - 1, psz, ulVar, rc);
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| 186 | return 1;
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| 187 | }
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| 188 | }
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| 189 | else
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| 190 | #endif /* __OS2__ */
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| 191 | if (putenv(psz))
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| 192 | {
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| 193 | fprintf(pStdErr, "%s: error: putenv(\"%s\"): %s\n", name(argv[0]), psz, strerror(errno));
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| 194 | return 1;
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| 195 | }
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| 196 | continue;
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| 197 | }
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| 198 |
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| 199 | /*
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| 200 | * Change directory switch?
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| 201 | */
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| 202 | if (*psz == 'C')
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| 203 | {
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| 204 | psz++;
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| 205 | if (*psz == ':' || *psz == '=')
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| 206 | psz++;
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| 207 | else
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| 208 | {
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| 209 | if (i + 1 >= argc)
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| 210 | {
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| 211 | fprintf(pStdErr, "%s: syntax error: no argument for %s\n", name(argv[0]), argv[i]);
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| 212 | return 1;
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| 213 | }
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| 214 | psz = argv[++i];
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| 215 | }
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| 216 | if (!chdir(psz))
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| 217 | continue;
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| 218 | #ifdef _MSC_VER
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| 219 | {
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| 220 | /* drop trailing slash if any. */
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| 221 | size_t cch = strlen(psz);
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| 222 | if ( cch > 2
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| 223 | && (psz[cch - 1] == '/' || psz[cch - 1] == '\\')
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| 224 | && psz[cch - 1] != ':')
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| 225 | {
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| 226 | int rc2;
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| 227 | char *pszCopy = strdup(psz);
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| 228 | do pszCopy[--cch] = '\0';
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| 229 | while ( cch > 2
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| 230 | && (pszCopy[cch - 1] == '/' || pszCopy[cch - 1] == '\\')
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| 231 | && pszCopy[cch - 1] != ':');
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| 232 | rc2 = chdir(pszCopy);
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| 233 | free(pszCopy);
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| 234 | if (!rc2)
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| 235 | continue;
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| 236 | }
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| 237 | }
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| 238 | #endif
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| 239 | fprintf(pStdErr, "%s: error: chdir(\"%s\"): %s\n", name(argv[0]), psz, strerror(errno));
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| 240 | return 1;
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| 241 | }
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| 242 |
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| 243 | /*
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| 244 | * Parse a file descriptor argument.
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| 245 | */
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| 246 |
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| 247 | /* mode */
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| 248 | switch (*psz)
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| 249 | {
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| 250 | case 'r':
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| 251 | psz++;
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| 252 | if (*psz == '+')
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| 253 | {
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| 254 | fOpen = O_RDWR;
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| 255 | psz++;
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| 256 | }
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| 257 | else
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| 258 | fOpen = O_RDONLY;
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| 259 | break;
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| 260 |
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| 261 | case 'w':
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| 262 | psz++;
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| 263 | if (*psz == '+')
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| 264 | {
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| 265 | psz++;
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| 266 | fOpen = O_RDWR | O_CREAT | O_TRUNC;
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| 267 | }
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| 268 | else
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| 269 | fOpen = O_WRONLY | O_CREAT | O_TRUNC;
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| 270 | break;
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| 271 |
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| 272 | case 'a':
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| 273 | psz++;
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| 274 | if (*psz == '+')
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| 275 | {
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| 276 | psz++;
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| 277 | fOpen = O_RDWR | O_CREAT | O_APPEND;
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| 278 | }
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| 279 | else
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| 280 | fOpen = O_WRONLY | O_CREAT | O_APPEND;
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| 281 | break;
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| 282 |
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| 283 | case 'i': /* make sure stdin is read-only. */
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| 284 | fOpen = O_RDONLY;
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| 285 | break;
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| 286 |
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| 287 | case '+':
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| 288 | fprintf(pStdErr, "%s: syntax error: Unexpected '+' in '%s'\n", name(argv[0]), argv[i]);
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| 289 | return 1;
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| 290 |
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| 291 | default:
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| 292 | fOpen = O_RDWR | O_CREAT | O_TRUNC;
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| 293 | break;
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| 294 | }
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| 295 |
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| 296 | /* binary / text modifiers */
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| 297 | switch (*psz)
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| 298 | {
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| 299 | case 'b':
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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 | psz++;
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| 304 | break;
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| 305 |
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| 306 | case 't':
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| 307 | #ifdef O_TEXT
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| 308 | fOpen |= O_TEXT;
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| 309 | #endif
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| 310 | psz++;
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| 311 | break;
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| 312 |
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| 313 | default:
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| 314 | #ifdef O_BINARY
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| 315 | fOpen |= O_BINARY;
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| 316 | #endif
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| 317 | break;
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| 318 |
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| 319 | }
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| 320 |
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| 321 | /* convert to file descriptor number */
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| 322 | switch (*psz)
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| 323 | {
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| 324 | case 'i':
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| 325 | fd = 0;
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| 326 | psz++;
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| 327 | break;
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| 328 |
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| 329 | case 'o':
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| 330 | fd = 1;
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| 331 | psz++;
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| 332 | break;
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| 333 |
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| 334 | case 'e':
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| 335 | fd = 2;
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| 336 | psz++;
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| 337 | break;
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| 338 |
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| 339 | case '0':
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| 340 | if (!psz[1])
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| 341 | {
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| 342 | fd = 0;
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| 343 | psz++;
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| 344 | break;
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| 345 | }
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| 346 | case '1':
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| 347 | case '2':
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| 348 | case '3':
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| 349 | case '4':
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| 350 | case '5':
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| 351 | case '6':
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| 352 | case '7':
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| 353 | case '8':
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| 354 | case '9':
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| 355 | fd = (int)strtol(psz, &psz, 0);
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| 356 | if (!fd)
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| 357 | {
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| 358 | fprintf(pStdErr, "%s: error: failed to convert '%s' to a number\n", name(argv[0]), argv[i]);
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| 359 | return 1;
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| 360 |
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| 361 | }
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| 362 | if (fd < 0)
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| 363 | {
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| 364 | fprintf(pStdErr, "%s: error: negative fd %d (%s)\n", name(argv[0]), fd, argv[i]);
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| 365 | return 1;
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| 366 | }
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| 367 | break;
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| 368 |
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| 369 | /*
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| 370 | * Invalid argument.
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| 371 | */
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| 372 | default:
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| 373 | fprintf(pStdErr, "%s: error: failed to convert '%s' ('%s') to a file descriptor\n", name(argv[0]), psz, argv[i]);
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| 374 | return 1;
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| 375 | }
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| 376 |
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| 377 | /*
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| 378 | * Check for the filename.
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| 379 | */
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| 380 | if (*psz)
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| 381 | {
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| 382 | if (*psz != ':' && *psz != '=')
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| 383 | {
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| 384 | fprintf(pStdErr, "%s: syntax error: characters following the file descriptor: '%s' ('%s')\n", name(argv[0]), psz, argv[i]);
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| 385 | return 1;
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| 386 | }
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| 387 | psz++;
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| 388 | }
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| 389 | else
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| 390 | {
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| 391 | i++;
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| 392 | if (i >= argc)
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| 393 | {
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| 394 | fprintf(pStdErr, "%s: syntax error: missing filename argument.\n", name(argv[0]));
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| 395 | return 1;
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| 396 | }
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| 397 | psz = argv[i];
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| 398 | }
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| 399 |
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| 400 | /*
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| 401 | * Setup the redirection.
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| 402 | */
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| 403 | if (fd == fileno(pStdErr))
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| 404 | {
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| 405 | /*
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| 406 | * Move stderr to a new location, making it close on exec.
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| 407 | * If pStdOut has already teamed up with pStdErr, update it too.
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| 408 | */
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| 409 | FILE *pNew;
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| 410 | fdOpened = dup(fileno(pStdErr));
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| 411 | if (fdOpened == -1)
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| 412 | {
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| 413 | fprintf(pStdErr, "%s: error: failed to dup stderr (%d): %s\n", name(argv[0]), fileno(pStdErr), strerror(errno));
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| 414 | return 1;
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| 415 | }
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| 416 | #ifdef _MSC_VER
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| 417 | /** @todo figure out how to make the handle close-on-exec. We'll simply close it for now.
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| 418 | * SetHandleInformation + set FNOINHERIT in CRT.
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| 419 | */
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| 420 | #else
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| 421 | if (fcntl(fdOpened, F_SETFD, FD_CLOEXEC) == -1)
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| 422 | {
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| 423 | fprintf(pStdErr, "%s: error: failed to make stderr (%d) close-on-exec: %s\n", name(argv[0]), fdOpened, strerror(errno));
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| 424 | return 1;
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| 425 | }
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| 426 | #endif
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| 427 |
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| 428 | pNew = fdopen(fdOpened, "w");
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| 429 | if (!pNew)
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| 430 | {
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| 431 | fprintf(pStdErr, "%s: error: failed to fdopen the new stderr (%d): %s\n", name(argv[0]), fdOpened, strerror(errno));
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| 432 | return 1;
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| 433 | }
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| 434 | if (pStdOut == pStdErr)
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| 435 | pStdOut = pNew;
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| 436 | pStdErr = pNew;
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| 437 | }
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| 438 | else if (fd == 1 && pStdOut != pStdErr)
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| 439 | pStdOut = pStdErr;
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|---|
| 440 |
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|---|
| 441 | /*
|
|---|
| 442 | * Close and open the new file descriptor.
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| 443 | */
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|---|
| 444 | close(fd);
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|---|
| 445 | #if defined(_MSC_VER)
|
|---|
| 446 | if (!strcmp(psz, "/dev/null"))
|
|---|
| 447 | psz = (char *)"nul";
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|---|
| 448 | #endif
|
|---|
| 449 | fdOpened = open(psz, fOpen, 0666);
|
|---|
| 450 | if (fdOpened == -1)
|
|---|
| 451 | {
|
|---|
| 452 | fprintf(pStdErr, "%s: error: failed to open '%s' as %d: %s\n", name(argv[0]), psz, fd, strerror(errno));
|
|---|
| 453 | return 1;
|
|---|
| 454 | }
|
|---|
| 455 | if (fdOpened != fd)
|
|---|
| 456 | {
|
|---|
| 457 | /* move it (dup2 returns 0 on MSC). */
|
|---|
| 458 | if (dup2(fdOpened, fd) == -1)
|
|---|
| 459 | {
|
|---|
| 460 | fprintf(pStdErr, "%s: error: failed to dup '%s' as %d: %s\n", name(argv[0]), psz, fd, strerror(errno));
|
|---|
| 461 | return 1;
|
|---|
| 462 | }
|
|---|
| 463 | close(fdOpened);
|
|---|
| 464 | }
|
|---|
| 465 | }
|
|---|
| 466 | else
|
|---|
| 467 | {
|
|---|
| 468 | fprintf(pStdErr, "%s: syntax error: Invalid argument '%s'.\n", name(argv[0]), argv[i]);
|
|---|
| 469 | return usage(pStdErr, name(argv[0]));
|
|---|
| 470 | }
|
|---|
| 471 | }
|
|---|
| 472 |
|
|---|
| 473 | /*
|
|---|
| 474 | * Make sure there's something to execute.
|
|---|
| 475 | */
|
|---|
| 476 | if (i >= argc)
|
|---|
| 477 | {
|
|---|
| 478 | fprintf(pStdErr, "%s: syntax error: nothing to execute!\n", name(argv[0]));
|
|---|
| 479 | return usage(pStdErr, name(argv[0]));
|
|---|
| 480 | }
|
|---|
| 481 |
|
|---|
| 482 | #if defined(_MSC_VER)
|
|---|
| 483 | if (fileno(pStdErr) != 2) /* no close-on-exec flag on windows */
|
|---|
| 484 | {
|
|---|
| 485 | fclose(pStdErr);
|
|---|
| 486 | pStdErr = NULL;
|
|---|
| 487 | }
|
|---|
| 488 |
|
|---|
| 489 | /** @todo
|
|---|
| 490 | * We'll have to find the '--' in the commandline and pass that
|
|---|
| 491 | * on to CreateProcess or spawn. Otherwise, the argument qouting
|
|---|
| 492 | * is gonna be messed up.
|
|---|
| 493 | */
|
|---|
| 494 | rc = _spawnvp(_P_WAIT, argv[i], &argv[i]);
|
|---|
| 495 | if (rc == -1 && pStdErr)
|
|---|
| 496 | {
|
|---|
| 497 | fprintf(pStdErr, "%s: error: _spawnvp(_P_WAIT, \"%s\", ...) failed: %s\n", name(argv[0]), argv[i], strerror(errno));
|
|---|
| 498 | rc = 1;
|
|---|
| 499 | }
|
|---|
| 500 | return rc;
|
|---|
| 501 | #else
|
|---|
| 502 | execvp(argv[i], &argv[i]);
|
|---|
| 503 | fprintf(pStdErr, "%s: error: _execvp(_P_WAIT, \"%s\", ...) failed: %s\n", name(argv[0]), argv[i], strerror(errno));
|
|---|
| 504 | return 1;
|
|---|
| 505 | #endif
|
|---|
| 506 | }
|
|---|
| 507 |
|
|---|