I am not sure how to use proc to receive CPU and memory. My specific question, how should I use ioctl to read memory and cpu. When I use ioctl with PIOCPSINFO, PIOCSTATUS, PIOCGROUPS I am not able to get any answers. What am I missing? Any help is greatly appreciated. My program follows: pid_t getpidbyname(char *name,pid_t skipit) { DIR *dp; struct dirent *dirp; prpsinfo_t retval; prstatus_t val; prcred_t user; int fd; pid_t ourretval=-1; int i = 0; if((dp=opendir("/proc"))==NULL){ return -1; } chdir("/proc"); while((dirp=readdir(dp))!=NULL) { i++; if(dirp->d_name[0]!='.') { if((fd=open(dirp->d_name,O_RDONLY))!=-1) { printf("Dummy name: %s\n",dirp->d_name); if( (ioctl(fd,PIOCPSINFO,&retval)!=-1) && (ioctl(fd,PIOCSTATUS,&val)!=-1) && (ioctl(fd,PIOCGROUPS,&user)!=-1) ) { printf("Numeric Process State: %c\n", retval.pr_state); printf("Printable char rep: %c\n", retval.pr_sname); printf("Process terminated but not valid for: %c\n", retval.pr_zomb); printf("Nice for CPU usage: %c\n", retval.pr_nice); printf("Process flags: %d\n", retval.pr_flag); printf("Real User ID: %d\n", retval.pr_uid); printf("Real Group ID: %d\n", retval.pr_gid); printf("Process ID: %d\n", retval.pr_pid); printf("Parent Process ID: %d\n", retval.pr_ppid); printf("CPU Usage: %c\n", retval.pr_cpu); printf("Last content of Exe'd pathname: %s\n", retval.pr_fname); printf("Initial char of Arg list: %s\n\n", retval.pr_psargs); printf("Scheduling Class name: %s\n", val.pr_clname); printf(" if(!strcmp(retval.pr_fname,name)) { ourretval=(pid_t)atoi(dirp->d_name); if(skipit!=-1 && ourretval==skipit) { ourretval=-1; } else{ close(fd); break; } } } close(fd); } } }