QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
qnx_getclock() message structure |
| Ref. No. |
QNX.000006537 |
| Category(ies) |
Development |
| Issue |
We need further details on the qnx_getclock() function. We use qnx_getclock() to pass time and date info over the Ethernet to client nodes, and we would like to be able to capture and view the bits that carry this info.
|
| Solution |
qnx_getclock() is merely a message to Proc, which fills in the second and nanosecond fields. Here's what it does:
#include <sys/proc_msg.h>
#include <sys/kernel.h>
#include <errno.h>
#include <time.h>
#include <sys/timers.h>
int clock_gettime(clockid_t clock_id, struct timespec *tp)x09/* 1003.4/D12 */
x09{
x09return(qnx_getclock(0, clock_id, tp));
x09}
int qnx_getclock(pid_t proc_pid, clockid_t clock_id, struct timespec *tp)
x09{
union {
struct _proc_time s;
struct _proc_time_reply r;
} msg;
clock_id = clock_id;
msg.s.type = _PROC_TIME;
msg.s.seconds = -1;
msg.s.nsec = -1;
msg.s.zero1 = 0;
if( Send( proc_pid ? proc_pid : PROC_PID,
x09x09x09x09&msg.s, &msg.r, sizeof( msg.s ), sizeof( msg.r ) ) == -1 )
return( -1 );
tp->tv_sec = msg.s.seconds;
tp->tv_nsec = msg.s.nsec;
if( msg.r.status != EOK ) {
errno = msg.r.status;
return( -1 );
}
return( 0 );
x09}
/* qnx 4.01 compat */
int getclock(clock_type, tp)
int clock_type;
register struct timespec *tp;
x09{
x09return(qnx_getclock(0, clock_type, tp));
x09}
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