Infrastructure Software

Hello,

I have a strange behaviour reading process table from procfs. Some processes have a resident size and image size of 0 (zero). So I wrote a little test program and generated a 32bit binary. It gave me the same result. After I made a 64bit binary and this brought the expected results. Do anyone of you have an idea what i'm making wrong. Below you can find an output example and the code of the program.

Every answer is appreciated
erinda
pid name nlwp %cpu %mem image resident
----------------------------------------------------------
1 init 1 0.00 0.03 2368 1184
7 svc.startd 13 0.01 0.04 8696 1720
649 snmpd 1 0.00 0.08 0 0
24151 oracle 11 0.00 7.01 0 0
....
pid name nlwp %cpu %mem image resident
----------------------------------------------------------
1 init 1 0.00 0.03 2368 1184
7 svc.startd 13 0.01 0.04 8696 1720
649 snmpd 1 0.00 0.08 9352 3440
24151 oracle 11 0.00 7.01 330240 286664


and here the program
int main(int ac, char * av[])
{
struct dirent * procEntry;
char prcPath[PRARGSZ];
psinfo_t prcInfo;
pid_t pid;
int rtc;

DIR * procDir = opendir("/proc");
if(procDir == NULL)
{
printf("opendir(/proc) failed\n");
return 1;
}

printf(" pid name nlwp %%cpu %%mem image resident\n");
printf("----------------------------------------------------------\n");
rewinddir(procDir);
while(procEntry = readdir(procDir))
{
if(procEntry->d_name[0] == '.' || // skip "." and ".."
procEntry->d_name[0] == '\0') // skip empty name
{
continue;
}

pid = atoi(procEntry->d_name);
if(pid == 0 || pid == 2 || pid == 3)
{
continue;
}

size_t size = sizeof(psinfo_t);
sprintf (prcPath, "/proc/%s/psinfo", procEntry->d_name);
int pprocfs = open(prcPath, O_RDONLY);
if (pprocfs < 0)
{
return 2;
}
else
{
ssize_t bytesRead = read(pprocfs, &prcInfo, size);
if (bytesRead != size)
{
return 3;
}
close (pprocfs);
}

printf(" %5d %-15s %4d %5.2f %5.2f %8lu %8lu\n",
prcInfo.pr_pid,
prcInfo.pr_fname,
prcInfo.pr_nlwp,
(float)(100.0 * prcInfo.pr_pctcpu / 0x8000),
(float)(100.0 * prcInfo.pr_pctmem / 0x8000),
(ulong_t)prcInfo.pr_size,
(ulong_t)prcInfo.pr_rssize);
}
}