File: [local] / prex-old / usr / server / exec / args.c (download)
Revision 1.1.1.1.2.1, Wed Aug 13 16:12:43 2008 UTC (16 years ago) by nbrk
Branch: PREX_0_8_BASE
Changes since 1.1.1.1: +5 -4 lines
Prex 0.8.0 has been released. Branch off from vanilla PREX_0_7_BASE preparing
the tree for backporting my changes.
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/*
* Copyright (c) 2005-2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* args.c - routine to build arguments
*/
#include <prex/prex.h>
#include <server/fs.h>
#include <server/proc.h>
#include <sys/list.h>
#include <limits.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "exec.h"
/*
* Build argument on stack.
*
* Stack layout:
* file name string
* env string
* arg string
* NULL
* envp[n]
* NULL
* argv[n]
* argc
*
* NOTE: This may depend on processor architecture.
*/
int
build_args(task_t task, void *stack, struct exec_msg *msg, void **new_sp)
{
int argc, envc;
char *path, *file;
char **argv, **envp;
int i, err;
u_long arg_top, mapped, sp;
argc = msg->argc;
envc = msg->envc;
path = (char *)&msg->path;
/*
* Map target stack in current task.
*/
err = vm_map(task, stack, USTACK_SIZE, (void *)&mapped);
if (err)
return ENOMEM;
memset((void *)mapped, 0, USTACK_SIZE);
sp = mapped + USTACK_SIZE - sizeof(int) * 3;
/*
* Copy items
*/
/* File name */
*(char *)sp = '\0';
sp -= strlen(path);
sp = ALIGN(sp);
strlcpy((char *)sp, path, USTACK_SIZE);
file = (char *)sp;
/* arg/env */
sp -= ALIGN(msg->bufsz);
memcpy((char *)sp, (char *)&msg->buf, msg->bufsz);
arg_top = sp;
/* envp[] */
sp -= ((envc + 1) * sizeof(char *));
envp = (char **)sp;
/* argv[] */
sp -= ((argc + 1) * sizeof(char *));
argv = (char **)sp;
/* argc */
sp -= sizeof(int);
*(int *)(sp) = argc + 1;
/*
* Build argument list
*/
argv[0] = (char *)((u_long)stack + (u_long)file - mapped);
DPRINTF(("exec: argv[0] = %s\n", argv[0]));
for (i = 1; i <= argc; i++) {
argv[i] = (char *)((u_long)stack + (arg_top - mapped));
while ((*(char *)arg_top++) != '\0');
DPRINTF(("exec: argv[%d] = %s\n", i, argv[i]));
}
argv[argc + 1] = NULL;
for (i = 0; i < envc; i++) {
envp[i] = (char *)((u_long)stack + (arg_top - mapped));
while ((*(char *)arg_top++) != '\0');
}
envp[envc] = NULL;
*new_sp = (void *)((u_long)stack + (sp - mapped));
vm_free(task_self(), (void *)mapped);
return 0;
}