/*************************************************************************** * User front end for using huge pages Copyright (C) 2008, IBM * * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the Lesser GNU General Public License as * * published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. * * * * You should have received a copy of the Lesser 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. * ***************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#define _GNU_SOURCE /* for getopt_long */
#include <unistd.h>
#include <getopt.h>
#include <sys/personality.h>
/* Peronsality bit for huge page backed stack */
#ifndef HUGETLB_STACK
#define HUGETLB_STACK 0x0020000
#endif
extern int errno;
extern int optind;
extern char *optarg;
void print_usage()
{
fprintf(stderr, "hugectl [options] target\n");
fprintf(stderr, "options:\n");
fprintf(stderr, " --help, -h Prints this message.\n");
fprintf(stderr,
" --stack, -s Attempts to execute target program with a hugtlb
page backed stack.\n");
}
void set_huge_stack()
{
char * err;
unsigned long curr_per = personality(0xffffffff);
if (personality(curr_per | HUGETLB_STACK) == -1) {
err = strerror(errno);
fprintf(stderr,
"Error setting HUGE_STACK personality flag: '%s'\n",
err);
exit(-1);
}
}
int main(int argc, char** argv)
{
char opts [] = "+hs";
int ret = 0, index = 0;
struct option long_opts [] = {
{"help", 0, 0, 'h'},
{"stack", 0, 0, 's'},
{0, 0, 0, 0},
};
if (argc < 2) {
print_usage();
return 0;
}
while (ret != -1) {
ret = getopt_long(argc, argv, opts, long_opts, &index);
switch (ret) {
case 's':
set_huge_stack();
break;
case '?':
case 'h':
print_usage();
return 0;
case -1:
break;
default:
ret = -1;
break;
}
}
index = optind;
if (execvp(argv[index], &argv[index]) == -1) {
ret = errno;
fprintf(stderr, "Error calling execvp: '%s'\n", strerror(ret));
return ret;
}
return 0;
}
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