/*
* Copyright (c) International Business Machines Corp., 2001
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* FUNCTIONS: Scheduler Test Suite */
/*---------------------------------------------------------------------+
| sched_tc1 |
| ==================================================================== |
| |
| Description: Creates short-term disk I/O bound process |
| |
| Algorithm: o Set process priority |
| o Open a large file |
| o Continuously read from file until interrupted |
| o Close file upon receiving interrupt |
| |
| To compile: cc -o sched_tc1 sched_tc1.c -L. -lpsc |
| |
| Usage: sched_tc1 [-p priority] [-v] [-d] |
| |
| Last update: Ver. 1.4, 4/10/94 23:05:00 |
| |
| Change Activity |
| |
| Version Date Name Reason |
| 0.1 050689 CTU Initial version |
| 0.2 010402 Manoj Iyer Ported to Linux |
| |
+---------------------------------------------------------------------*/
#include <stdlib.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "sched.h"
/*
* Defines:
*
* USAGE: usage statement
*
* DEFAULT_PRIORITY_TYPE: default priority
*
*/
#define DEFAULT_PRIORITY_TYPE "variable"
#define USAGE "Usage: %s [-p priority] [-v] [-d] \n" \
" -p priority priority (default variable) \n" \
" -v verbose \n" \
" -d enable debugging messages \n"
/*
* Function prototypes:
*
* process_file: reads data file
*
* parse_args: parse command line arguments
*/
void process_file(char *);
void parse_args(int, char **);
void signal_handler();
/*
* Global variables:
*
* verbose: enable normal messages
*
* debug: enable debugging messages
*
* signaled: set upon receiving SIGUSER1 signal
*
* priority: process type (fixed priority, variable priority)
*/
int verbose = 0;
int debug = 0;
int signaled = 0;
char *priority = DEFAULT_PRIORITY_TYPE;
/*---------------------------------------------------------------------+
| main |
| ==================================================================== |
| |
| Function: ... |
| |
+---------------------------------------------------------------------*/
int main(int argc, char **argv)
{
char *filename = NULL;
if ((filename = getenv("KERNEL")) == NULL) {
errno = ENODATA;
sys_error("environment variable KERNEL not set", __FILE__,
__LINE__);
}
/*
* Setup signal handler & setup alarm so we do not loop forever...
*/
signal(SIGUSR1, signal_handler);
signal(SIGALRM, signal_handler);
alarm(600); /* wait 10 minutes before aborting */
/*
* Process command line arguments...
*/
parse_args(argc, argv);
if (verbose)
printf("%s: Scheduler TestSuite program\n\n", *argv);
if (debug) {
printf("\tpriority: %s\n", priority);
}
/*
* Adjust the priority of this process if the real time flag is set
*/
if (!strcmp(priority, "fixed")) {
#ifndef __linux__
if (setpri(0, DEFAULT_PRIORITY) < 0)
sys_error("setpri failed", __FILE__, __LINE__);
#else
if (setpriority(PRIO_PROCESS, 0, 0) < 0)
sys_error("setpri failed", __FILE__, __LINE__);
#endif
}
/*
* Continuously read through file until interrupted...
*/
while (!signaled)
process_file(filename);
/*
* Exit with success!
*/
if (verbose)
printf("\nsuccessful!\n");
return (0);
}
/*---------------------------------------------------------------------+
| process_file () |
| ==================================================================== |
| |
| Function: Opens a file, reads from it until it encounters an |
| end-of-file and then closes the file.. |
| |
+---------------------------------------------------------------------*/
void process_file(char *filename)
{
char record[100]; /* holds each record of the file read */
FILE *datafile; /* file pointer to the open file */
/*
* Try and open the datafile
*/
if ((datafile = fopen(filename, "r")) == NULL)
sys_error("fopen failed", __FILE__, __LINE__);
/*
* Read the first record of the datafile, then read until end-of-file
*/
while (fgets(record, 80, datafile)) {
if (feof(datafile))
break;
}
/*
* Close the datafile
*/
if (fclose(datafile))
sys_error("fclose failed", __FILE__, __LINE__);
}
/*---------------------------------------------------------------------+
| signal_handler () |
| ==================================================================== |
| |
| Function: ... |
| |
+---------------------------------------------------------------------*/
void signal_handler(int signal)
{
printf("signal received is %d\n", signal);
if (signal == SIGUSR1) {
signaled++;
if (debug)
printf("\n\t<< caught SIGUSR1 interrupt>>\n");
} else if (signal == SIGALRM) {
error("Failed to receive SIGUSR1 signal before timeout!",
__FILE__, __LINE__);
} else
error("received unexpected signal", __FILE__, __LINE__);
}
/*---------------------------------------------------------------------+
| parse_args () |
| ==================================================================== |
| |
| Function: Parse the command line arguments & initialize global |
| variables. |
| |
| Updates: (command line options) |
| |
| [-p] priority: "fixed" or "variable" |
| [-t] n: execution time in hours |
| [-v] verbose |
| [-d] enable debugging messages |
| |
+---------------------------------------------------------------------*/
void parse_args(int argc, char **argv)
{
int opt;
int pflg = 0;
int errflag = 0;
char *program_name = *argv;
extern char *optarg; /* Command line option */
/*
* Parse command line options.
*/
if (argc < 2) {
fprintf(stderr, USAGE, program_name);
exit(0);
}
while ((opt = getopt(argc, argv, "p:t:vd")) != EOF) {
switch (opt) {
case 'p': /* process type */
pflg++;
priority = optarg;
break;
case 'v': /* verbose */
verbose++;
break;
case 'd': /* enable debugging messages */
verbose++;
debug++;
break;
default:
errflag++;
break;
}
}
/*
* Check percentage, execution time and process slots...
*/
if (pflg) {
if (strcmp(priority, "fixed") && strcmp(priority, "variable"))
errflag++;
}
if (errflag) {
fprintf(stderr, USAGE, program_name);
exit(2);
}
}