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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-01-16 17:38:44 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-01-16 17:38:44 +0200
commitf3f219527f69d581a1839e93b749c29545eb0119 (patch)
treeb8604340671673911f6a0c94d843785081c7bdb9 /jittertest/JitterTest.c
parentd78b73e2ca216777e17066091ef449e9cdaffae7 (diff)
tests: move jittertest to tests directory
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'jittertest/JitterTest.c')
-rw-r--r--jittertest/JitterTest.c1044
1 files changed, 0 insertions, 1044 deletions
diff --git a/jittertest/JitterTest.c b/jittertest/JitterTest.c
deleted file mode 100644
index 13c64d9..0000000
--- a/jittertest/JitterTest.c
+++ /dev/null
@@ -1,1044 +0,0 @@
-/***********************************************************************
- *
- * Copyright: Daniel Measurement and Control, Inc.
- * 9753 Pine Lake Drive
- * Houston, TX 77055
- *
- * Created by: Vipin Malik and Gail Murray
- * Released under GPL by permission of Daniel Industries.
- *
- * This software is licensed under the GPL version 2. Plese see the file
- * COPYING for details on the license.
- *
- * NO WARRANTY: Absolutely no claims of warranty or fitness of purpose
- * are made in this software. Please use at your own risk.
- *
- * Filename: JitterTest.c
- *
- * Description: Program to be used to measure wake jitter.
- * See README file for more info.
- *
- *
- * Revision History:
- * $Id: JitterTest.c,v 1.13 2005/11/07 11:15:20 gleixner Exp $
- * $Log: JitterTest.c,v $
- * Revision 1.13 2005/11/07 11:15:20 gleixner
- * [MTD / JFFS2] Clean up trailing white spaces
- *
- * Revision 1.12 2001/08/10 19:23:11 vipin
- * Ready to be released under GPL! Added proper headers etc.
- *
- * Revision 1.11 2001/07/09 15:35:50 vipin
- * Couple of new features:1. The program runs by default as a "regular"
- * (SCHED_OTHER) task by default, unless the -p n cmd line parameter is
- * specified. It then runs as SCHED_RR at that priority.
- * 2. Added ability to send SIGSTOP/SIGCONT to a specified PID. This
- * would presumably be the PID of the JFFS2 GC task. SIGSTOP is sent
- * before writing to the fs, and a SIGCONT after the write is done.
- * 3. The "pad" data now written to the file on the "fs under test" is
- * random, not sequential as previously.
- *
- * Revision 1.10 2001/06/27 19:14:24 vipin
- * Now console file to log at can be specified from cmd line. This can enable
- * you to run two instances of the program- one logging to the /dev/console
- * and another to a regular file (if you want the data) or /dev/null if you don't.
- *
- * Revision 1.9 2001/06/25 20:21:31 vipin
- * This is the latest version, NOT the one last checked in!
- *
- * Revision 1.7 2001/06/18 22:36:19 vipin
- * Fix minor typo that excluded '\n' from msg on console.
- *
- * Revision 1.6 2001/06/18 21:17:50 vipin
- * Added option to specify the amount of data written to outfile each period.
- * The regular info is written, but is then padded to the requested size.
- * This will enable testing of different sized writes to JFFS fs.
- *
- * Revision 1.5 2001/06/08 19:36:23 vipin
- * All write() are now checked for return err code.
- *
- * Revision 1.4 2001/06/06 23:10:31 vipin
- * Added README file.
- * In JitterTest.c: Changed operation of periodic timer to one shot. The timer is now
- * reset when the task wakes. This way every "jitter" is from the last time and
- * jitters from previous times are not accumulated and screw aroud with our display.
- *
- * All jitter is now +ve. (as it should be). Also added a "read file" functionality
- * to test for jitter in task if we have to read from JFFS fs.
- * The program now also prints data to console- where it can be logged, interspersed with
- * other "interesting" printk's from the kernel and drivers (flash sector erases etc.)
- *
- * Revision 1.3 2001/03/01 19:20:39 gmurray
- * Add priority scheduling. Shortened name of default output file.
- * Changed default interrupt period. Output delta time and jitter
- * instead of time of day.
- *
- * Revision 1.2 2001/02/28 16:20:19 vipin
- * Added version control Id and log fields.
- *
- ***********************************************************************/
-/*************************** Included Files ***************************/
-#include <stdio.h> /* fopen, printf, fprintf, fclose */
-#include <string.h> /* strcpy, strcmp */
-#include <stdlib.h> /* exit, atol, atoi */
-#include <sys/time.h> /* setitimer, settimeofday, gettimeofday */
-#include <signal.h> /* signal */
-#include <sched.h> /* sched_setscheduler, sched_get_priority_min,*/
-/* sched_get_priority_max */
-#include <unistd.h> /* gettimeofday, sleep */
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-
-
-
-/**************************** Enumerations ****************************/
-enum timerActions
- {
- ONESHOT,
- AUTORESETTING
- };
-
-
-
-/****************************** Constants *****************************/
-/* Exit error codes */
-#define EXIT_FILE_OPEN_ERR (1) /* error opening output file*/
-#define EXIT_REG_SIGALRM_ERR (2) /* error registering SIGALRM*/
-#define EXIT_REG_SIGINT_ERR (3) /* error registering SIGINT */
-#define EXIT_INV_INT_PERIOD (4) /* error invalid int. period*/
-#define EXIT_MIN_PRIORITY_ERR (5) /* error, minimum priority */
-#define EXIT_MAX_PRIORITY_ERR (6) /* error, maximum priority */
-#define EXIT_INV_SCHED_PRIORITY (7) /* error, invalid priority */
-#define EXIT_SET_SCHEDULER_ERR (8) /* error, set scheduler */
-#define EXIT_PREV_TIME_OF_DAY_ERR (9) /* error, init. prev. */
-/* time of day */
-
-#define MAX_FILE_NAME_LEN (32) /* maximum file name length */
-
-#define STRINGS_EQUAL ((int) 0) /* strcmp value if equal */
-
-#define MIN_INT_PERIOD_MILLISEC ( 5L) /* minimum interrupt period */
-#define MAX_INT_PERIOD_MILLISEC (5000L) /* maximum interrupt period */
-#define DEF_INT_PERIOD_MILLISEC ( 10L) /* default interrupt period */
-
-#define READ_FILE_MESSAGE "This is a junk file. Must contain at least 1 byte though!\n"
-
-/* The user can specify that the program pad out the write file to
- a given number of bytes. But a minimum number needs to be written. This
- will contain the jitter info.
-*/
-#define MIN_WRITE_BYTES 30
-#define DEFAULT_WRITE_BYTES 30
-#define MAX_WRITE_BYTES 4096
-
-/* used for gen a printable ascii random # between spc and '~' */
-#define MIN_ASCII 32 /* <SPACE> can be char*/
-#define MAX_ASCII 126.0 /* needs to be float. See man rand() */
-
-/*----------------------------------------------------------------------
- * It appears that the preprocessor can't handle multi-line #if
- * statements. Thus, the check on the default is divided into two
- * #if statements.
- *---------------------------------------------------------------------*/
-#if (DEF_INT_PERIOD_MILLISEC < MIN_INT_PERIOD_MILLISEC)
-#error *** Invalid default interrupt period. ***
-#endif
-
-#if (DEF_INT_PERIOD_MILLISEC > MAX_INT_PERIOD_MILLISEC)
-#error *** Invalid default interrupt period. ***
-#endif
-
-
-#define TRUE 1 /* Boolean true value */
-#define FALSE 0
-
-/* Time conversion constants. */
-#define MILLISEC_PER_SEC (1000L) /* milliseconds per second */
-#define MICROSEC_PER_MILLISEC (1000L) /* microsecs per millisec */
-#define MICROSEC_PER_SEC (1000000L) /* microsecs per second */
-
-#define PRIORITY_POLICY ((int) SCHED_RR) /* If specified iwth "-p" */
-
-
-
-/************************** Module Variables **************************/
-/* version identifier (value supplied by CVS)*/
-static const char Version[] = "$Id: JitterTest.c,v 1.13 2005/11/07 11:15:20 gleixner Exp $";
-
-static char OutFileName[MAX_FILE_NAME_LEN+1]; /* output file name */
-static char LogFile[MAX_FILE_NAME_LEN+1] = "/dev/console"; /* default */
-static char ReadFile[MAX_FILE_NAME_LEN+1]; /* This file is read. Should
- contain at least 1 byte */
-
-static int WriteBytes = DEFAULT_WRITE_BYTES; /* pad out file to these many bytes. */
-static int Fd1; /* fd where the above buffer if o/p */
-static int Cfd; /* fd to console (or file specified) */
-static int Fd2; /* fd for the ReadFile */
-static int DoRead = FALSE; /* should we attempt to ReadFile?*/
-static long InterruptPeriodMilliSec; /* interrupt period, millisec */
-static int MinPriority; /* minimum scheduler priority */
-static int MaxPriority; /* maximum scheduler priority */
-static int RequestedPriority; /* requested priority */
-static struct itimerval ITimer; /* interrupt timer structure */
-static struct timeval PrevTimeVal; /* previous time structure */
-static struct timeval CurrTimeVal; /* current time structure */
-static long LastMaxDiff = 0; /* keeps track of worst jitter encountered */
-
-static int GrabKProfile = FALSE; /* To help determine system bottle necks
- this parameter can be set. This causes
- the /proc/profile file to be read and
- stored in unique filenames in current
- dir, and indication to be o/p on the
- /dev/console also.
- */
-static long ProfileTriggerMSecs = 15000l; /* Jitter time in seconds that triggers
- a snapshot of the profile to be taken
-
- */
-static int SignalGCTask = FALSE; /* should be signal SIGSTOP/SIGCONT to gc task?*/
-static int GCTaskPID;
-
-static int RunAsRTTask = FALSE; /* default action unless priority is
- specified on cmd line */
-
-
-/********************* Local Function Prototypes **********************/
-void HandleCmdLineArgs(int argc, char *argv[]);
-void SetFileName(char * pFileName);
-void SetInterruptPeriod(char * pASCIIInterruptPeriodMilliSec);
-void SetSchedulerPriority(char * pASCIISchedulerPriority);
-
-void PrintVersionInfo(void);
-void PrintHelpInfo(void);
-
-int Write(int fd, void *buf, size_t bytes, int lineNo);
-
-void InitITimer(struct itimerval * pITimer, int action);
-
-/* For catching timer interrupts (SIGALRM). */
-void AlarmHandler(int sigNum);
-
-/* For catching Ctrl+C SIGINT. */
-void SignalHandler(int sigNum);
-
-
-
-/***********************************************************************
- * main function
- * return: exit code
- ***********************************************************************/
-int main(
- int argc,
- char *argv[])
-{
- struct sched_param schedParam;
-
- int mypri;
- char tmpBuf[200];
-
-
- strcpy(OutFileName,"jitter.dat");
- InterruptPeriodMilliSec = MIN_INT_PERIOD_MILLISEC;
-
- /* Get the minimum and maximum priorities. */
- MinPriority = sched_get_priority_min(PRIORITY_POLICY);
- MaxPriority = sched_get_priority_max(PRIORITY_POLICY);
- if (MinPriority == -1) {
- printf("\n*** Unable to get minimum priority. ***\n");
- exit(EXIT_MIN_PRIORITY_ERR);
- }
- if (MaxPriority == -1) {
- printf("\n*** Unable to get maximum priority. ***\n");
- exit(EXIT_MAX_PRIORITY_ERR);
- }
-
- /* Set requested priority to minimum value as default. */
- RequestedPriority = MinPriority;
-
- HandleCmdLineArgs(argc, argv);
-
- if(mlockall(MCL_CURRENT|MCL_FUTURE) < 0){
- printf("Could not lock task into memory. Bye\n");
- perror("Error");
- }
-
- if(RunAsRTTask){
-
- /* Set the priority. */
- schedParam.sched_priority = RequestedPriority;
- if (sched_setscheduler(
- 0,
- PRIORITY_POLICY,
- &schedParam) != (int) 0) {
- printf("Exiting: Unsuccessful sched_setscheduler.\n");
- close(Fd1);
- exit(EXIT_SET_SCHEDULER_ERR);
- }
-
-
- /* Double check as I have some doubts that it's really
- running at realtime priority! */
- if((mypri = sched_getscheduler(0)) != RequestedPriority)
- {
- printf("Not running with request priority %i. running with priority %i instead!\n",
- RequestedPriority, mypri);
- }else
- {
- printf("Running with %i priority. Good!\n", mypri);
- }
-
- }
-
- /*------------------------- Initializations --------------------------*/
- if((Fd1 = open(OutFileName, O_RDWR|O_CREAT|O_SYNC)) <= 0)
- {
- perror("Cannot open outfile for write:");
- exit(1);
- }
-
- /* If a request is made to read from a specified file, then create that
- file and fill with junk data so that there is something there to read.
- */
- if(DoRead)
- {
-
- if((Fd2 = open(ReadFile, O_RDWR|O_CREAT|O_SYNC|O_TRUNC)) <= 0)
- {
- perror("cannot open read file:");
- exit(1);
- }else
- {
-
- /* Don't really care how much we write here */
- if(write(Fd2, READ_FILE_MESSAGE, strlen(READ_FILE_MESSAGE)) < 0)
- {
- perror("Problems writing to readfile:");
- exit(1);
- }
- lseek(Fd2, 0, SEEK_SET); /* position back to byte #0 */
- }
- }
-
-
-
- /* Also log output to console. This way we can capture it
- on a serial console to a log file.
- */
- if((Cfd = open(LogFile, O_WRONLY|O_SYNC)) <= 0)
- {
- perror("cannot open o/p logfile:");
- exit(1);
- }
-
-
- /* Set-up handler for periodic interrupt. */
- if (signal(SIGALRM, &AlarmHandler) == SIG_ERR) {
- printf("Couldn't register signal handler for SIGALRM.\n");
- sprintf(tmpBuf,
- "Couldn't register signal handler for SIGALRM.\n");
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- close(Fd1);
- exit(EXIT_REG_SIGALRM_ERR);
- }
-
- /* Set-up handler for Ctrl+C to exit the program. */
- if (signal(SIGINT, &SignalHandler) == SIG_ERR) {
- printf("Couldn't register signal handler for SIGINT.\n");
- sprintf(tmpBuf,
- "Couldn't register signal handler for SIGINT.\n");
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- close(Fd1);
- exit(EXIT_REG_SIGINT_ERR);
- }
-
- printf("Press Ctrl+C to exit the program.\n");
- printf("Output File: %s\n", OutFileName);
- printf("Scheduler priority: %d\n", RequestedPriority);
- sprintf(tmpBuf, "\nScheduler priority: %d\n",
- RequestedPriority);
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
-
- printf("Interrupt period: %ld milliseconds\n",
- InterruptPeriodMilliSec);
- sprintf(tmpBuf, "Interrupt period: %ld milliseconds\n",
- InterruptPeriodMilliSec);
-
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
-
-
- fflush(0);
-
-
-
- /* Initialize the periodic timer. */
- InitITimer(&ITimer, ONESHOT);
-
- /* Initialize "previous" time. */
- if (gettimeofday(&PrevTimeVal, NULL) != (int) 0) {
- printf("Exiting - ");
- printf("Unable to initialize previous time of day.\n");
- sprintf(tmpBuf, "Exiting - ");
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- sprintf(tmpBuf,
- "Unable to initialize previous time of day.\n");
-
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- }
-
- /* Start the periodic timer. */
- setitimer(ITIMER_REAL, &ITimer, NULL);
-
-
- while(TRUE) { /* Intentional infinite loop. */
- /* Sleep for one second. */
- sleep((unsigned int) 1);
- }
-
- /* Just in case. File should be closed in SignalHandler. */
- close(Fd1);
- close(Cfd);
-
- return 0;
-}
-
-
-
-
-/***********************************************************************
- * SignalHandler
- * This is a handler for the SIGINT signal. It is assumed that the
- * SIGINT is due to the user pressing Ctrl+C to halt the program.
- * output: N/A
- ***********************************************************************/
-void SignalHandler(
- int sigNum)
-{
-
- char tmpBuf[200];
-
- /* Note sigNum not used. */
- printf("Ctrl+C detected. Worst Jitter time was:%fms.\nJitterTest exiting.\n",
- (float)LastMaxDiff/1000.0);
-
- sprintf(tmpBuf,
- "\nCtrl+C detected. Worst Jitter time was:%fms\nJitterTest exiting.\n",
- (float)LastMaxDiff/1000.0);
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
-
- close(Fd1);
- close(Cfd);
- exit(0);
-}
-
-
-
-
-
-/*
- A snapshot of the /proc/profile needs to be taken.
- This is stored as a new file every time, and the
- stats reset by doing a (any) write to the /proc/profile
- file.
- */
-void doGrabKProfile(int jitterusec, char *fileName)
-{
- int fdSnapshot;
- int fdProfile;
- int readBytes;
- char readBuf[4096];
-
- if((fdSnapshot = open(fileName, O_WRONLY | O_CREAT)) <= 0)
- {
- fprintf(stderr, "Could not open file %s.\n", fileName);
- perror("Error:");
- return;
- }
-
- if((fdProfile = open("/proc/profile", O_RDWR)) <= 0)
- {
- fprintf(stderr, "Could not open file /proc/profile. Make sure you booted with profile=2\n");
- close(fdSnapshot);
- return;
- }
-
- while((readBytes = read(fdProfile, readBuf, sizeof(readBuf))) > 0)
- {
- write(fdSnapshot, readBuf, readBytes);
- }
-
- close(fdSnapshot);
-
- if(write(fdProfile, readBuf, 1) != 1)
- {
- perror("Could Not clear profile by writing to /proc/profile:");
- }
-
- close(fdProfile);
-
-
-
-}/* end doGrabKProfile()*/
-
-
-/*
- Call this routine to clear the kernel profiling buffer /proc/profile
-*/
-void clearProfileBuf(void){
-
-
- int fdProfile;
- char readBuf[10];
-
-
- if((fdProfile = open("/proc/profile", O_RDWR)) <= 0)
- {
- fprintf(stderr, "Could not open file /proc/profile. Make sure you booted with profile=2\n");
- return;
- }
-
-
- if(write(fdProfile, readBuf, 1) != 1)
- {
- perror("Could Not clear profile by writing to /proc/profile:");
- }
-
- close(fdProfile);
-
-
-}/* end clearProfileBuf() */
-
-
-
-
-
-/***********************************************************************
- * AlarmHandler
- * This is a handler for the SIGALRM signal (due to the periodic
- * timer interrupt). It prints the time (seconds) to
- * the output file.
- * output: N/A
- ***********************************************************************/
-void AlarmHandler(
- int sigNum) /* signal number (not used) */
-{
-
- long timeDiffusec; /* diff time in micro seconds */
- long intervalusec;
-
-
- char tmpBuf[MAX_WRITE_BYTES];
- int cntr;
- char padChar;
-
- static int profileFileNo = 0;
- char profileFileName[150];
-
- static int seedStarter = 0; /* carries over rand info to next time
- where time() will be the same as this time
- if invoked < 1sec apart.
- */
-
- if (gettimeofday(&CurrTimeVal, NULL) == (int) 0) {
-
- /*----------------------------------------------------------------
- * Compute the elapsed time between the current and previous
- * time of day values and store the result.
- *
- * Print the elapsed time to the output file.
- *---------------------------------------------------------------*/
-
- timeDiffusec = (long)(((((long long)CurrTimeVal.tv_sec) * 1000000L) + CurrTimeVal.tv_usec) -
- (((long long)PrevTimeVal.tv_sec * 1000000L) + PrevTimeVal.tv_usec));
-
- sprintf(tmpBuf," %f ms ", (float)timeDiffusec/1000.0);
-
- intervalusec = InterruptPeriodMilliSec * 1000L;
-
- timeDiffusec = timeDiffusec - intervalusec;
-
- sprintf(&tmpBuf[strlen(tmpBuf)]," %f ms", (float)timeDiffusec/1000.0);
-
-
- /* should we send a SIGSTOP/SIGCONT to the specified PID? */
- if(SignalGCTask){
-
- if(kill(GCTaskPID, SIGSTOP) < 0){
-
- perror("error:");
- }
- }
-
-
- /* Store some historical #'s */
- if(abs(timeDiffusec) > LastMaxDiff)
- {
- LastMaxDiff = abs(timeDiffusec);
- sprintf(&tmpBuf[strlen(tmpBuf)],"!");
-
- if((GrabKProfile == TRUE) && (ProfileTriggerMSecs < (abs(timeDiffusec)/1000)))
- {
- sprintf(profileFileName, "JitterTest.profilesnap-%i", profileFileNo);
-
- /* go and grab the kernel performance profile. */
- doGrabKProfile(timeDiffusec, profileFileName);
- profileFileNo++; /* unique name next time */
-
- /* Say so on the console so that a marker gets put in the console log */
- sprintf(&tmpBuf[strlen(tmpBuf)],"<Profile saved in file:%s>",
- profileFileName);
-
- }
-
- }
-
-
-
-
- sprintf(&tmpBuf[strlen(tmpBuf)],"\n"); /* CR for the data going out of the console */
-
- Write(Cfd, tmpBuf, strlen(tmpBuf), __LINE__);
-
-
- /* The "-1" below takes out the '\n' at the end that we appended for the msg printed on
- the console.*/
- sprintf(&tmpBuf[strlen(tmpBuf)-1]," PadBytes:");
-
- /* Now pad the output file if requested by user. */
- if(WriteBytes > MIN_WRITE_BYTES)
- {
-
- /* start from a new place every time */
- srand(time(NULL) + seedStarter);
-
- /* already written MIN_WRITE_BYTES by now */
- for(cntr = strlen(tmpBuf); cntr < WriteBytes - 1 ; cntr++) /* "-1" adj for '\n' at end */
- {
- /* don't accept any # < 'SPACE' */
- padChar = (char)(MIN_ASCII+(int)((MAX_ASCII-(float)MIN_ASCII)*rand()/(RAND_MAX+1.0)));
-
-
- /*
- padChar = (cntr % (126-33)) + 33;
- */
-
- tmpBuf[cntr] = padChar;
- }
-
- seedStarter = tmpBuf[cntr-1]; /* save for next time */
-
- tmpBuf[cntr] = '\n'; /* CR for the data going into the outfile. */
- tmpBuf[cntr+1] = '\0'; /* NULL terminate the string */
- }
-
- /* write out the entire line to the output file. */
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
-
- /* Read a byte from the specified file */
- if(DoRead)
- {
-
- read(Fd2, tmpBuf, 1);
- lseek(Fd2, 0, SEEK_SET); /* back to start */
- }
-
-
- /* Start the periodic timer again. */
- setitimer(ITIMER_REAL, &ITimer, NULL);
-
-
- /* Update previous time with current time. */
- PrevTimeVal.tv_sec = CurrTimeVal.tv_sec;
- PrevTimeVal.tv_usec = CurrTimeVal.tv_usec;
- }
-
- else {
- sprintf(tmpBuf, "gettimeofday error \n");
- Write(Fd1, tmpBuf, strlen(tmpBuf), __LINE__);
-
- printf("gettimeofday error \n");
- }
-
- /* now clear the profiling buffer */
- if(GrabKProfile == TRUE){
-
- clearProfileBuf();
- }
-
- /* should we send a SIGSTOP/SIGCONT to the specified PID? */
- if(SignalGCTask){
-
- if(kill(GCTaskPID, SIGCONT) < 0){
-
- perror("error:");
- }
- }
-
-
- return;
-}
-
-
-
-/***********************************************************************
- * InitITimer
- * This function initializes the 'struct itimerval' structure whose
- * address is passed to interrupt every InterruptPeriodMilliSec.
- * output: N/A
- ***********************************************************************/
-void InitITimer(
- struct itimerval * pITimer, /* pointer to interrupt timer struct*/
- int action) /* ONESHOT or autosetting? */
-{
- long seconds; /* seconds portion of int. period */
- long microSeconds; /* microsec. portion of int. period */
-
- /*--------------------------------------------------------------------
- * Divide the desired interrupt period into its seconds and
- * microseconds components.
- *-------------------------------------------------------------------*/
- if (InterruptPeriodMilliSec < MILLISEC_PER_SEC) {
- seconds = 0L;
- microSeconds = InterruptPeriodMilliSec * MICROSEC_PER_MILLISEC;
- }
- else {
- seconds = InterruptPeriodMilliSec / MILLISEC_PER_SEC;
- microSeconds =
- (InterruptPeriodMilliSec - (seconds * MILLISEC_PER_SEC)) *
- MICROSEC_PER_MILLISEC;
- }
-
- /* Initialize the interrupt period structure. */
- pITimer->it_value.tv_sec = seconds;
- pITimer->it_value.tv_usec = microSeconds;
-
- if(action == ONESHOT)
- {
- /* This will (should) prevent the timer from restarting itself */
- pITimer->it_interval.tv_sec = 0;
- pITimer->it_interval.tv_usec = 0;
- }else
- {
- pITimer->it_interval.tv_sec = seconds;
- pITimer->it_interval.tv_usec = microSeconds;
-
- }
-
- return;
-}
-
-
-/***********************************************************************
- * HandleCmdLineArgs
- * This function handles the command line arguments.
- * output: stack size
- ***********************************************************************/
-void HandleCmdLineArgs(
- int argc, /* number of command-line arguments */
- char *argv[]) /* ptrs to command-line arguments */
-{
- int argNum; /* argument number */
-
- if (argc > (int) 1) {
-
- for (argNum = (int) 1; argNum < argc; argNum++) {
-
- /* The command line contains an argument. */
-
- if ((strcmp(argv[argNum],"--version") == STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-v") == STRINGS_EQUAL)) {
- /* Print version information and exit. */
- PrintVersionInfo();
- exit(0);
- }
-
- else if ((strcmp(argv[argNum],"--help") == STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-h") == STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-?") == STRINGS_EQUAL)) {
- /* Print help information and exit. */
- PrintHelpInfo();
- exit(0);
- }
-
- else if ((strcmp(argv[argNum],"--file") == STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-f") == STRINGS_EQUAL)) {
- /* Set the name of the output file. */
- ++argNum;
- if (argNum < argc) {
- SetFileName(argv[argNum]);
- }
- else {
- printf("*** Output file name not specified. ***\n");
- printf("Default output file name will be used.\n");
- }
- }
-
- else if ((strcmp(argv[argNum],"--time") == STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-t") == STRINGS_EQUAL)) {
- /* Set the interrupt period. */
- ++argNum;
- if (argNum < argc) {
- SetInterruptPeriod(argv[argNum]);
- }
- else {
- printf("*** Interrupt period not specified. ***\n");
- printf("Default interrupt period will be used.\n");
- }
-
- }
-
- else if ((strcmp(argv[argNum],"--priority") ==
- STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-p") == STRINGS_EQUAL)) {
- /* Set the scheduler priority. */
- ++argNum;
- if (argNum < argc) {
- SetSchedulerPriority(argv[argNum]);
- }
- else {
- printf("*** Scheduler priority not specified. ***\n");
- printf("Default scheduler priority will be used.\n");
- }
-
- }
-
- else if ((strcmp(argv[argNum],"--readfile") ==
- STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-r") == STRINGS_EQUAL)) {
- /* Set the file to read*/
- ++argNum;
-
- strncpy(ReadFile, argv[argNum], sizeof(ReadFile));
- DoRead = TRUE;
- }
-
- else if ((strcmp(argv[argNum],"--write_bytes") ==
- STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-w") == STRINGS_EQUAL)) {
- /* Set the file to read*/
- ++argNum;
-
- WriteBytes = atoi(argv[argNum]);
-
- if(WriteBytes < MIN_WRITE_BYTES)
- {
- printf("Writing less than %i bytes is not allowed. Bye.\n",
- MIN_WRITE_BYTES);
- exit(0);
- }
-
-
- }
-
- else if ((strcmp(argv[argNum],"--consolefile") ==
- STRINGS_EQUAL) ||
- (strcmp(argv[argNum],"-c") == STRINGS_EQUAL)) {
- /* Set the file to log console log on. */
- ++argNum;
-
- strncpy(LogFile, argv[argNum], sizeof(LogFile));
- }
-
- else if ((strcmp(argv[argNum],"--grab_kprofile") ==
- STRINGS_EQUAL))
- {
- /* We will read the /proc/profile file on configurable timeout */
- GrabKProfile = TRUE;
-
- ++argNum;
-
- /* If the jittter is > this #, then the profile is grabbed. */
- ProfileTriggerMSecs = (long) atoi(argv[argNum]);
-
- if(ProfileTriggerMSecs <= 0){
-
- printf("Illegal value for profile trigger threshold.\n");
- exit(0);
- }
- }
-
- else if ((strcmp(argv[argNum],"--siggc") ==
- STRINGS_EQUAL))
- {
- /* We will SIGSTOP/SIGCONT the specified pid */
- SignalGCTask = TRUE;
-
- ++argNum;
-
- GCTaskPID = atoi(argv[argNum]);
-
- if(ProfileTriggerMSecs <= 0){
-
- printf("Illegal value for JFFS(2) GC task pid.\n");
- exit(0);
- }
- }
-
-
- else {
- /* Unknown argument. Print help information and exit. */
- printf("Invalid option %s\n", argv[argNum]);
- printf("Try 'JitterTest --help' for more information.\n");
- exit(0);
- }
- }
- }
-
- return;
-}
-
-
-/***********************************************************************
- * SetFileName
- * This function sets the output file name.
- * output: N/A
- ***********************************************************************/
-void SetFileName(
- char * pFileName) /* ptr to desired output file name */
-{
- size_t fileNameLen; /* file name length (bytes) */
-
- /* Check file name length. */
- fileNameLen = strlen(pFileName);
- if (fileNameLen > (size_t) MAX_FILE_NAME_LEN) {
- printf("File name %s exceeds maximum length %d.\n",
- pFileName, MAX_FILE_NAME_LEN);
- exit(0);
- }
-
- /* File name length is OK so save the file name. */
- strcpy(OutFileName, pFileName);
-
- return;
-}
-
-
-/***********************************************************************
- * SetInterruptPeriod
- * This function sets the interrupt period.
- * output: N/A
- ***********************************************************************/
-void SetInterruptPeriod(
- char * /* ptr to desired interrupt period */
- pASCIIInterruptPeriodMilliSec)
-{
- long period; /* interrupt period */
-
- period = atol(pASCIIInterruptPeriodMilliSec);
- if ((period < MIN_INT_PERIOD_MILLISEC) ||
- (period > MAX_INT_PERIOD_MILLISEC)) {
- printf("Invalid interrupt period: %ld ms.\n", period);
- exit(EXIT_INV_INT_PERIOD);
- }
- else {
- InterruptPeriodMilliSec = period;
- }
- return;
-}
-
-
-/***********************************************************************
- * SetSchedulerPriority
- * This function sets the desired scheduler priority.
- * output: N/A
- ***********************************************************************/
-void SetSchedulerPriority(
- char * pASCIISchedulerPriority) /* ptr to desired scheduler priority*/
-{
- int priority; /* desired scheduler priority value */
-
- priority = atoi(pASCIISchedulerPriority);
- if ((priority < MinPriority) ||
- (priority > MaxPriority)) {
- printf("Scheduler priority %d outside of range [%d, %d]\n",
- priority, MinPriority, MaxPriority);
- exit(EXIT_INV_SCHED_PRIORITY);
- }
- else {
- RequestedPriority = priority;
- RunAsRTTask = TRUE; /* We shall run as a POSIX real time task */
- }
- return;
-}
-
-
-/***********************************************************************
- * PrintVersionInfo
- * This function prints version information.
- * output: N/A
- ***********************************************************************/
-void PrintVersionInfo(void)
-{
- printf("JitterTest version %s\n", Version);
- printf("Copyright (c) 2001, Daniel Industries, Inc.\n");
- return;
-}
-
-
-/***********************************************************************
- * PrintHelpInfo
- * This function prints help information.
- * output: N/A
- ***********************************************************************/
-void PrintHelpInfo(void)
-{
- printf("Usage: JitterTest [options]\n");
- printf(" *** Requires root privileges. ***\n");
- printf("Option:\n");
- printf(" [-h, --help, -?] Print this message and exit.\n");
- printf(" [-v, --version] ");
- printf( "Print the version number of JitterTest and exit.\n");
- printf(" [-f FILE, --file FILE] Set output file name to FILE. Typically you would put this on the fs under test\n");
- printf(" [-c FILE, --consolefile] Set device or file to write the console log to.\n\tTypically you would set this to /dev/console and save it on another computer.\n");
- printf(" [-w BYTES, --write_bytes BYTES Write BYTES to FILE each period.\n");
- printf(" [-r FILE, --readfile FILE] Also read 1 byte every cycle from FILE. FILE will be created and filled with data.\n");
- printf(" [-t <n>, --time <n>] ");
- printf( "Set interrupt period to <n> milliseconds.\n");
- printf(" ");
- printf( "Range: [%ld, %ld] milliseconds.\n",
- MIN_INT_PERIOD_MILLISEC, MAX_INT_PERIOD_MILLISEC);
- printf(" [-p <n>, --priority <n>] ");
- printf( "Set scheduler priority to <n>.\n");
- printf(" ");
- printf( "Range: [%d, %d] (higher number = higher priority)\n",
- MinPriority, MaxPriority);
- printf(" [--grab_kprofile <THRESHOLD in ms>] Read the /proc/profile if jitter is > THRESHOLD and store in file.\n");
- printf(" [--siggc <PID>] Before writing to fs send SIGSTOP to PID. After write send SIGCONT\n");
- return;
-
-}
-
-
-/* A common write that checks for write errors and exits. Pass it __LINE__ for lineNo */
-int Write(int fd, void *buf, size_t bytes, int lineNo)
-{
-
- int err;
-
- err = write(fd, buf, bytes);
-
- if(err < bytes)
- {
-
- printf("Write Error at line %i! Wanted to write %i bytes, but wrote only %i bytes.\n",
- lineNo, bytes, err);
- perror("Write did not complete. Error. Bye:"); /* show error from errno. */
- exit(1);
-
- }
-
- return err;
-
-}/* end Write*/