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#include "kernel/types.h"
#include "kernel/riscv.h"
#include "kernel/sysinfo.h"
#include "user/user.h"
void
sinfo(struct sysinfo *info) {
if (sysinfo(info) < 0) {
printf("FAIL: sysinfo failed");
exit(1);
}
}
//
// use sbrk() to count how many free physical memory pages there are.
//
int
countfree()
{
uint64 sz0 = (uint64)sbrk(0);
struct sysinfo info;
int n = 0;
while(1){
if((uint64)sbrk(PGSIZE) == 0xffffffffffffffff){
break;
}
n += PGSIZE;
}
sinfo(&info);
if (info.freemem != 0) {
printf("FAIL: there is no free mem, but sysinfo.freemem=%d\n",
info.freemem);
exit(1);
}
sbrk(-((uint64)sbrk(0) - sz0));
return n;
}
void
testmem() {
struct sysinfo info;
uint64 n = countfree();
sinfo(&info);
if (info.freemem!= n) {
printf("FAIL: free mem %d (bytes) instead of %d\n", info.freemem, n);
exit(1);
}
if((uint64)sbrk(PGSIZE) == 0xffffffffffffffff){
printf("sbrk failed");
exit(1);
}
sinfo(&info);
if (info.freemem != n-PGSIZE) {
printf("FAIL: free mem %d (bytes) instead of %d\n", n-PGSIZE, info.freemem);
exit(1);
}
if((uint64)sbrk(-PGSIZE) == 0xffffffffffffffff){
printf("sbrk failed");
exit(1);
}
sinfo(&info);
if (info.freemem != n) {
printf("FAIL: free mem %d (bytes) instead of %d\n", n, info.freemem);
exit(1);
}
}
void
testcall() {
struct sysinfo info;
if (sysinfo(&info) < 0) {
printf("FAIL: sysinfo failed\n");
exit(1);
}
if (sysinfo((struct sysinfo *) 0xeaeb0b5b00002f5e) != 0xffffffffffffffff) {
printf("FAIL: sysinfo succeeded with bad argument\n");
exit(1);
}
}
void testproc() {
struct sysinfo info;
uint64 nproc;
int status;
int pid;
sinfo(&info);
nproc = info.nproc;
pid = fork();
if(pid < 0){
printf("sysinfotest: fork failed\n");
exit(1);
}
if(pid == 0){
sinfo(&info);
if(info.nproc != nproc+1) {
printf("sysinfotest: FAIL nproc is %d instead of %d\n", info.nproc, nproc+1);
exit(1);
}
exit(0);
}
wait(&status);
sinfo(&info);
if(info.nproc != nproc) {
printf("sysinfotest: FAIL nproc is %d instead of %d\n", info.nproc, nproc);
exit(1);
}
}
void testbad() {
int pid = fork();
int xstatus;
if(pid < 0){
printf("sysinfotest: fork failed\n");
exit(1);
}
if(pid == 0){
sinfo(0x0);
exit(0);
}
wait(&xstatus);
if(xstatus == -1) // kernel killed child?
exit(0);
else {
printf("sysinfotest: testbad succeeded %d\n", xstatus);
exit(xstatus);
}
}
int
main(int argc, char *argv[])
{
printf("sysinfotest: start\n");
testcall();
testmem();
testproc();
printf("sysinfotest: OK\n");
exit(0);
}
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