getrusage() in qnx4.25

QNX USERS QNX2 and QNX4
1

I find getrusage function in unix library, but no <sys/resource.h> found.

even that the code below compiling and works but all values printed out is zero.
What das it means?

#include <sys/time.h>
#include <stdio.h>

#define RUSAGE_SELF 0
#define RUSAGE_CHILDREN -1

typedef struct rusage {
struct timeval ru_utime; /* user time used /
struct timeval ru_stime; / system time used /
long ru_maxrss; / max resident set size /
long ru_ixrss; / integral shared memory size /
long ru_idrss; / integral unshared data " /
long ru_isrss; / integral unshared stack " /
long ru_minflt; / page reclaims /
long ru_majflt; / page faults /
long ru_nswap; / swaps /
long ru_inblock; / block input operations /
long ru_oublock; / block output operations /
long ru_msgsnd; / messages sent /
long ru_msgrcv; / messages received /
long ru_nsignals; / signals received /
long ru_nvcsw; / voluntary context switches /
long ru_nivcsw; / involuntary " */
} rusage;

main(){

int who = RUSAGE_SELF;
struct rusage usage;
int ret;

ret = getrusage(who, &usage);

printf(“result %d\n”, ret);

printf(“user time used %d sec %d usec\n”, usage.ru_utime.tv_sec, usage.ru_utime.tv_usec);
printf(“system time used %d sec %d usec\n”, usage.ru_stime.tv_sec, usage.ru_utime.tv_usec);

printf(“max resident set size %d\n”, usage.ru_maxrss);
printf(“integral shared memory size %d\n”, usage.ru_ixrss);
printf(“integral unshared data %d\n”, usage.ru_idrss);
printf(“integral unshared stack %d\n”, usage.ru_isrss);
printf(“page reclaims %d\n”, usage.ru_minflt);
printf(“page faults %d\n”, usage.ru_majflt);
printf(“swaps %d\n”, usage.ru_nswap);
printf(“block input operations %d\n”, usage.ru_inblock);
printf(“block output operations %d\n”, usage.ru_oublock);
printf(“messages sent %d\n”, usage.ru_msgsnd);
printf(“messages received %d\n”, usage.ru_msgrcv);
printf(“signals received %d\n”, usage.ru_nsignals);
printf(“voluntary context switches %d\n”, usage.ru_nvcsw);
printf(“involuntary %d\n”, usage.ru_nivcsw);

2

That’s it is probably unsupported ;-) The unix library tries to add unix like capability but it’s not 100%.

As far as I know most of the stats returned don’t even exists in QNX4…

3

I insert the job before getrusage() like

unsigned long i;
for(i=0;i<0x8fffffff;i++){
cos(1.234);
}

and rusage.ru_utime shows execution time like utilite time do.

That’s enought to many cases.
I think it needs to patch qnx4 itself.
AFAIK Linux uses not all stats in rusage too.

4

patch qnx4?? Huh?

If you says rusage.ru_utime works, why are you saying in your first that all values are 0.

5

In first program there is nothihg to do, and if you insert delay(…) there is still nothing to do and utime is 0 unless you define usage to something else before getrusage() call. You may test it.

In sys/resource.h declared five functions.

int getpriority(int, id_t);
int getrlimit(int, struct rlimit *);
int getrusage(int, struct rusage *);
int setpriority(int, id_t, int);
int setrlimit(int, const struct rlimit *);

setprioriy() may be redefine to setprio() and getpriority() to getprio(), but set/getrlimit I don’t know how.

6

Set/get limit are not supported, you can replace them by a return -e and errno set to ENOTSUP.