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Annotation of prex-old/usr/server/exec/args.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 2005-2007, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * args.c - routine to build arguments
        !            32:  */
        !            33:
        !            34: #include <prex/prex.h>
        !            35: #include <server/fs.h>
        !            36: #include <server/proc.h>
        !            37: #include <sys/list.h>
        !            38:
        !            39: #include <limits.h>
        !            40: #include <unistd.h>
        !            41: #include <stdlib.h>
        !            42: #include <string.h>
        !            43: #include <stdio.h>
        !            44: #include <fcntl.h>
        !            45: #include <unistd.h>
        !            46: #include <errno.h>
        !            47:
        !            48: #include "exec.h"
        !            49:
        !            50: /*
        !            51:  * Build argument on stack.
        !            52:  *
        !            53:  * Stack layout:
        !            54:  *    file name string
        !            55:  *    env string
        !            56:  *    arg string
        !            57:  *    NULL
        !            58:  *    envp[n]
        !            59:  *    NULL
        !            60:  *    argv[n]
        !            61:  *    argc
        !            62:  *
        !            63:  * NOTE: This may depend on processor architecture.
        !            64:  */
        !            65: int
        !            66: build_args(task_t task, void *stack, struct exec_msg *msg, void **new_sp)
        !            67: {
        !            68:        int argc, envc;
        !            69:        char *path, *file;
        !            70:        char **argv, **envp;
        !            71:        int i, err;
        !            72:        u_long arg_top, mapped, sp;
        !            73:
        !            74:        argc = msg->argc;
        !            75:        envc = msg->envc;
        !            76:        path = (char *)&msg->path;
        !            77:
        !            78:        /*
        !            79:         * Map target stack in current task.
        !            80:         */
        !            81:        err = vm_map(task, stack, USTACK_SIZE, (void *)&mapped);
        !            82:        if (err)
        !            83:                return ENOMEM;
        !            84:        memset((void *)mapped, 0, USTACK_SIZE);
        !            85:
        !            86:        sp = mapped + USTACK_SIZE - sizeof(int);
        !            87:
        !            88:        /*
        !            89:         * Copy items
        !            90:         */
        !            91:
        !            92:        /* File name */
        !            93:        *(char *)sp = '\0';
        !            94:        sp -= strlen(path);
        !            95:        sp = ALIGN(sp);
        !            96:        strlcpy((char *)sp, path, USTACK_SIZE);
        !            97:        file = (char *)sp;
        !            98:
        !            99:        /* arg/env */
        !           100:        sp -= ALIGN(msg->bufsz);
        !           101:        memcpy((char *)sp, (char *)&msg->buf, msg->bufsz);
        !           102:        arg_top = sp;
        !           103:
        !           104:        /* envp[] */
        !           105:        sp -= ((envc + 1) * sizeof(char *));
        !           106:        envp = (char **)sp;
        !           107:
        !           108:        /* argv[] */
        !           109:        sp -= ((argc + 1) * sizeof(char *));
        !           110:        argv = (char **)sp;
        !           111:
        !           112:        /* argc */
        !           113:        sp -= sizeof(int);
        !           114:        *(int *)(sp) = argc + 1;
        !           115:
        !           116:        /*
        !           117:         * Build argument list
        !           118:         */
        !           119:        argv[0] = (char *)((u_long)stack + (u_long)file - mapped);
        !           120:
        !           121:        for (i = 1; i <= argc; i++) {
        !           122:                argv[i] = (char *)((u_long)stack + (arg_top - mapped));
        !           123:                while ((*(char *)arg_top)++ != '\0');
        !           124:        }
        !           125:        argv[argc + 1] = NULL;
        !           126:
        !           127:        for (i = 0; i < envc; i++) {
        !           128:                envp[i] = (char *)((u_long)stack + (arg_top - mapped));
        !           129:                while ((*(char *)arg_top)++ != '\0');
        !           130:        }
        !           131:        envp[envc] = NULL;
        !           132:
        !           133:        *new_sp = (void *)((u_long)stack + (sp - mapped));
        !           134:
        !           135:        vm_free(task_self(), (void *)mapped);
        !           136:
        !           137:        return 0;
        !           138: }