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Old 10-14-2010, 12:11 PM   #1
hiteurecomupf
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Registered: Oct 2010
Location: Barcelona
Distribution: Linux Ubuntu 9.10
Posts: 13

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Issue with undefined reference to `clock_gettime'


Hi ,

I am slowly getting accustomed with linux issues and its different programming compilation stuffs. and i must say am truly liking it.

Now i am facing this typical error , "undefined reference to `clock_gettime'" while i am compiling a code, which is not mine as it required to install a simulator. Now i have read about this type for the last 2 days and i have included "-lrt" in the make file and included <time.h> in the header files which was missing but still i am getting that error.

Now matter how many times i run the make file with the required changes its still giving me this error, which i have comprehended as mainly linking problem rather than a compilation issue.

Can anyone help me where it's still getting wrong.

Cheers ,

Sougata
 
Old 10-14-2010, 12:22 PM   #2
Sergei Steshenko
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Quote:
Originally Posted by hiteurecomupf View Post
Hi ,

I am slowly getting accustomed with linux issues and its different programming compilation stuffs. and i must say am truly liking it.

Now i am facing this typical error , "undefined reference to `clock_gettime'" while i am compiling a code, which is not mine as it required to install a simulator. Now i have read about this type for the last 2 days and i have included "-lrt" in the make file and included <time.h> in the header files which was missing but still i am getting that error.

Now matter how many times i run the make file with the required changes its still giving me this error, which i have comprehended as mainly linking problem rather than a compilation issue.

Can anyone help me where it's still getting wrong.

Cheers ,

Sougata
Did you read 'man 3 clock_gettime' ? If yes, how many lines ?
 
Old 10-15-2010, 11:48 AM   #3
hiteurecomupf
LQ Newbie
 
Registered: Oct 2010
Location: Barcelona
Distribution: Linux Ubuntu 9.10
Posts: 13

Original Poster
Rep: Reputation: 0
Dear Sergei,

Thanks a lot for pointing me the manual page for clock_gettime function. Its really helped me to understand what exactly this function means.I have tried to do some changes to the code but I am still having issues with this clock_gettime function, now i am having errors "error: expected ;, , or ) before numeric constant". This error is coming at the line "int clock_gettime(clockid_t CLOCK_REALTIME, struct timespec *tp);"

The code is attached below. When am running the makefile , i am having the above mentioned error.

#include "../ptpd.h"
#include <time.h>

int clock_gettime(clockid_t CLOCK_REALTIME, struct timespec *tp);


int
isTimeInternalNegative(const TimeInternal * p)
{
return (p->seconds < 0) || (p->nanoseconds < 0);
}


int
snprint_TimeInternal(char *s, int max_len, const TimeInternal * p)
{
int len = 0;

if (isTimeInternalNegative(p))
len += snprintf(&s[len], max_len - len, "-");

len += snprintf(&s[len], max_len - len, "%d.%09d",
abs(p->seconds), abs(p->nanoseconds));

return len;
}



int
snprint_ClockIdentity(char *s, int max_len, const Octet uuid[PTP_UUID_LENGTH], const char *info)
{
int len = 0;
int i;

if (info)
len += snprintf(&s[len], max_len - len, "%s", info);

for (i = 0; {
len += snprintf(&s[len], max_len - len, "%02x", (unsigned char) uuid[i]);

if (++i >= PTP_UUID_LENGTH)
break;

// uncomment the line below to print a separator after each byte except the last one
// len += snprintf(&s[len], max_len - len, "%s", "-");
}

return len;
}


int
snprint_PortIdentity(char *s, int max_len, const Octet uuid[PTP_UUID_LENGTH],
UInteger16 portId, const char *info)
{
int len = 0;

if (info)
len += snprintf(&s[len], max_len - len, "%s", info);

len += snprint_ClockIdentity(&s[len], max_len - len, uuid, NULL);
len += snprintf(&s[len], max_len - len, ":%02x", portId);
return len;
}


void
message(int priority, const char *format, ...)
{
extern RunTimeOpts rtOpts;
va_list ap;
va_start(ap, format);
if(rtOpts.useSysLog) {
static Boolean logOpened;
if(!logOpened) {
openlog("ptpd", 0, LOG_USER);
logOpened = TRUE;
}
vsyslog(priority, format, ap);
} else {
fprintf(stderr, "(ptpd %s) ",
priority == LOG_EMERG ? "emergency" :
priority == LOG_ALERT ? "alert" :
priority == LOG_CRIT ? "critical" :
priority == LOG_ERR ? "error" :
priority == LOG_WARNING ? "warning" :
priority == LOG_NOTICE ? "notice" :
priority == LOG_INFO ? "info" :
priority == LOG_DEBUG ? "debug" :
"???");
vfprintf(stderr, format, ap);
}
va_end(ap);
}

char *
translatePortState(PtpClock *ptpClock)
{
char *s;
switch(ptpClock->port_state) {
case PTP_INITIALIZING: s = "init"; break;
case PTP_FAULTY: s = "flt"; break;
case PTP_LISTENING: s = "lstn"; break;
case PTP_PASSIVE: s = "pass"; break;
case PTP_UNCALIBRATED: s = "uncl"; break;
case PTP_SLAVE: s = "slv"; break;
case PTP_PRE_MASTER: s = "pmst"; break;
case PTP_MASTER: s = "mst"; break;
case PTP_DISABLED: s = "dsbl"; break;
default: s = "?"; break;
}
return s;
}

void
displayStats(RunTimeOpts * rtOpts, PtpClock * ptpClock)
{
static int start = 1;
static char sbuf[SCREEN_BUFSZ];
int len = 0;
struct timeval now;
char time_str[MAXTIMESTR];

if (start && rtOpts->csvStats) {
start = 0;
printf("timestamp, state, one way delay, offset from master, "
"slave to master, master to slave, drift, variance");
fflush(stdout);
}
memset(sbuf, ' ', sizeof(sbuf));

gettimeofday(&now, 0);
strftime(time_str, MAXTIMESTR, "%Y-%m-%d %X", localtime(&now.tv_sec));

len += snprintf(sbuf + len, sizeof(sbuf) - len, "%s%s:%06d, %s",
rtOpts->csvStats ? "\n" : "\rstate: ",
time_str, (int)now.tv_usec,
translatePortState(ptpClock));

if (ptpClock->port_state == PTP_SLAVE) {
len += snprint_PortIdentity(sbuf + len, sizeof(sbuf) - len,
ptpClock->parent_uuid, ptpClock->parent_port_id, " ");

len += snprintf(sbuf + len, sizeof(sbuf) - len,
", %s%d.%09d" ", %s%d.%09d",
rtOpts->csvStats ? "" : "stm: ",
ptpClock->slave_to_master_delay.seconds,
abs(ptpClock->slave_to_master_delay.nanoseconds),
rtOpts->csvStats ? "" : "mts: ",
ptpClock->master_to_slave_delay.seconds,
abs(ptpClock->master_to_slave_delay.nanoseconds));

/*
* if grandmaster ID differs from parent port ID then also
* print GM ID
*/
if (memcmp(ptpClock->grandmaster_uuid_field,
ptpClock->parent_uuid, PTP_UUID_LENGTH)) {
len += snprint_ClockIdentity(sbuf + len,
sizeof(sbuf) - len,
ptpClock->grandmaster_uuid_field,
" GM:");
}

len += snprintf(sbuf + len, sizeof(sbuf) - len, ", ");

if (!rtOpts->csvStats)
len += snprintf(sbuf + len,
sizeof(sbuf) - len, "owd: ");

len += snprint_TimeInternal(sbuf + len, sizeof(sbuf) - len,
&ptpClock->one_way_delay);

len += snprintf(sbuf + len, sizeof(sbuf) - len, ", ");

if (!rtOpts->csvStats)
len += snprintf(sbuf + len, sizeof(sbuf) - len,
"ofm: ");

len += snprint_TimeInternal(sbuf + len, sizeof(sbuf) - len,
&ptpClock->offset_from_master);

len += sprintf(sbuf + len, ", %s%d",
rtOpts->csvStats ? "" : "drift: ",
ptpClock->observed_drift);
}
else {
if (ptpClock->port_state == PTP_MASTER) {
len += snprint_ClockIdentity(sbuf + len, sizeof(sbuf) - len,
ptpClock->clock_uuid_field, " (ID:");
len += snprintf(sbuf + len, sizeof(sbuf) - len, ")");
}
}
write(1, sbuf, rtOpts->csvStats ? len : SCREEN_MAXSZ + 1);
}

Boolean
nanoSleep(TimeInternal * t)
{
struct timespec ts, tr;

ts.tv_sec = t->seconds;
ts.tv_nsec = t->nanoseconds;

if (nanosleep(&ts, &tr) < 0) {
t->seconds = tr.tv_sec;
t->nanoseconds = tr.tv_nsec;
return FALSE;
}
return TRUE;
}

void
getTime(TimeInternal * time)
{
struct timespec tp;
if (clock_gettime(CLOCK_REALTIME, &tp) < 0) {
PERROR("clock_gettime() failed, exiting.");
exit(0);
}
time->seconds = tp.tv_sec;
time->nanoseconds = tp.tv_nsec;

}

void
setTime(TimeInternal * time)
{
struct timeval tv;

tv.tv_sec = time->seconds;
tv.tv_usec = time->nanoseconds / 1000;
settimeofday(&tv, 0);

NOTIFY("resetting system clock to %ds %dns\n",
time->seconds, time->nanoseconds);
}

UInteger16
getRand(UInteger32 * seed)
{
return rand_r((unsigned int *)seed);
}

Boolean
adjFreq(Integer32 adj)
{
struct timex t;

if (adj > ADJ_FREQ_MAX)
adj = ADJ_FREQ_MAX;
else if (adj < -ADJ_FREQ_MAX)
adj = -ADJ_FREQ_MAX;

t.modes = MOD_FREQUENCY;
t.freq = adj * ((1 << 16) / 1000);

return !adjtimex(&t);
}

Where am i missing again and again to fix this bug?

Regards ,

Sougata
 
Old 10-15-2010, 12:05 PM   #4
grail
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Registered: Sep 2009
Location: Perth
Distribution: Manjaro
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Please place [code][/code] tags around your code as that is almost impossible to read and follow without formatting.
 
Old 10-15-2010, 12:12 PM   #5
grail
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Distribution: Manjaro
Posts: 7,173

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I do have two questions:

1. Did you read the following lines in the man page and do you have the correct priveleges?
Code:
CLOCK_REALTIME
              System-wide real-time clock.  Setting this clock requires appropriate privileges.
2. Why is the following line at the start of your code?
Code:
int clock_gettime(clockid_t CLOCK_REALTIME, struct timespec *tp);
I ask as this looks like you are trying to retype / overload this particular function yet it is already defined in time.h
 
  


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