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/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: t -*- */
/*
* self_exec.c: self_exec magic required to run child functions on uClinux
*
* Copyright (C) 2005 Paul J.Y. Lahaie <pjlahaie-at-steamballoon.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* This software was produced by Steamballoon Incorporated
* 55 Byward Market Square, 2nd Floor North, Ottawa, ON K1N 9C3, Canada
*/
#define _GNU_SOURCE /* for asprintf */
#include "config.h"
#ifdef UCLINUX
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include "test.h"
/* Set from parse_opts.c: */
char *child_args; /* Arguments to child when -C is used */
static char *start_cwd; /* Stores the starting directory for self_exec */
int asprintf(char **app, const char *fmt, ...)
{
va_list ptr;
int rv;
char *p;
/*
* First iteration - find out size of buffer required and allocate it.
*/
va_start(ptr, fmt);
rv = vsnprintf(NULL, 0, fmt, ptr);
va_end(ptr);
p = malloc(++rv); /* allocate the buffer */
*app = p;
if (!p) {
return -1;
}
/*
* Second iteration - actually produce output.
*/
va_start(ptr, fmt);
rv = vsnprintf(p, rv, fmt, ptr);
va_end(ptr);
return rv;
}
void
maybe_run_child(void (*child)(), char *fmt, ...)
{
va_list ap;
char *child_dir;
char *p, *tok;
int *iptr, i, j;
char *s;
char **sptr;
char *endptr;
/* Store the current directory for later use. */
start_cwd = getcwd(NULL, 0);
if (child_args) {
char *args = strdup(child_args);
child_dir = strtok(args, ",");
if (strlen(child_dir) == 0) {
tst_resm(TBROK, NULL, "Could not get directory from -C option");
tst_exit();
}
va_start(ap, fmt);
for (p = fmt; *p; p++) {
tok = strtok(NULL, ",");
if (!tok || strlen(tok) == 0) {
tst_resm(TBROK, "Invalid argument to -C option");
tst_exit();
}
switch (*p) {
case 'd':
iptr = va_arg(ap, int *);
i = strtol(tok, &endptr, 10);
if (*endptr != '\0') {
tst_resm(TBROK, "Invalid argument to -C option");
tst_exit();
}
*iptr = i;
break;
case 'n':
j = va_arg(ap, int);
i = strtol(tok, &endptr, 10);
if (*endptr != '\0') {
tst_resm(TBROK, "Invalid argument to -C option");
tst_exit();
}
if (j != i) {
va_end(ap);
return;
}
break;
case 's':
s = va_arg(ap, char *);
if (!strncpy(s, tok, strlen(tok)+1)) {
tst_resm(TBROK, "Could not strncpy for -C option");
tst_exit();
}
break;
case 'S':
sptr = va_arg(ap, char **);
*sptr = strdup(tok);
if (!*sptr) {
tst_resm(TBROK, "Could not strdup for -C option");
tst_exit();
}
break;
default:
tst_resm(TBROK, "Format string option %c not implemented", *p);
tst_exit();
break;
}
}
va_end(ap);
if (chdir(child_dir) < 0) {
tst_resm(TBROK, "Could not change to %s for child", child_dir);
tst_exit();
}
(*child)();
tst_resm(TWARN, "Child function returned unexpectedly");
/* Exit here? or exit silently? */
}
}
int
self_exec(char *argv0, char *fmt, ...)
{
va_list ap;
char *p;
char *tmp_cwd;
char *arg;
int ival;
char *str;
if ((tmp_cwd = getcwd(NULL, 0)) == NULL) {
tst_resm(TBROK, "Could not getcwd()");
return -1;
}
arg = strdup( tmp_cwd );
if (( arg = strdup( tmp_cwd )) == NULL) {
tst_resm(TBROK, "Could not produce self_exec string");
return -1;
}
va_start(ap, fmt);
for (p = fmt; *p; p++) {
switch (*p) {
case 'd':
case 'n':
ival = va_arg(ap, int);
if (asprintf(&arg, "%s,%d", arg, ival) < 0) {
tst_resm(TBROK, "Could not produce self_exec string");
return -1;
}
break;
case 's':
case 'S':
str = va_arg(ap, char *);
if (asprintf(&arg, "%s,%s", arg, str) < 0) {
tst_resm(TBROK, "Could not produce self_exec string");
return -1;
}
break;
default:
tst_resm(TBROK, "Format string option %c not implemented", *p);
return -1;
break;
}
}
va_end(ap);
if (chdir(start_cwd) < 0) {
tst_resm(TBROK, "Could not change to %s for self_exec", start_cwd);
return -1;
}
return execlp(argv0, argv0, "-C", arg, (char *) NULL);
}
#endif /* UCLINUX */
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