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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <time.h>
#ifdef _HAS_SIGNAL
#include <signal.h> /* signal(...) */
#else
#warn "SIGNAL disabled!"
#endif
#if defined(_HAS_UTMP) || defined(_HAS_SYSINFO)
#include <string.h> /* memset */
#endif
#ifdef _HAS_UTMP
#include <utmp.h> /* utmp structure */
#else
#warn "UTMP disabled!"
#endif
#ifdef _HAS_SYSINFO
#include "sys/types.h" /* sysinfo structture */
#include "sys/sysinfo.h" /* sysinfo(...) */
#else
#warn "SYSINFO disabled!"
#endif
/* for print_memusage() and print cpuusage() see: http://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process */
static const char keymsg[] = " [PRESS ANY KEY TO QUIT] ";
static const char txtheader[] =
"**************\n"
"* dummyshell *\n"
"**************\n";
static volatile unsigned char doLoop = 1;
#ifdef _HAS_UTMP
static void print_utmp(void)
{
int utmpfd = open("/var/run/utmp", O_RDONLY);
if (utmpfd >= 0) {
struct utmp ut;
memset(&ut, '\0', sizeof(struct utmp));
printf("\33[2K\ruser online...: ");
while (read(utmpfd, &ut, sizeof(struct utmp)) == sizeof(struct utmp)) {
printf("%.*s ", UT_NAMESIZE, ut.ut_user);
}
printf("\n");
}
}
#endif
#ifdef _HAS_SYSINFO
static unsigned long long lastTotalUser, lastTotalUserLow, lastTotalSys, lastTotalIdle;
static void init_cpuusage(){
FILE* file = fopen("/proc/stat", "r");
if (file) {
fscanf(file, "cpu %llu %llu %llu %llu", &lastTotalUser, &lastTotalUserLow,
&lastTotalSys, &lastTotalIdle);
fclose(file);
}
}
static void print_cpuusage(){
double percent;
FILE* file;
unsigned long long totalUser, totalUserLow, totalSys, totalIdle, total;
file = fopen("/proc/stat", "r");
fscanf(file, "cpu %llu %llu %llu %llu", &totalUser, &totalUserLow,
&totalSys, &totalIdle);
fclose(file);
if (totalUser < lastTotalUser || totalUserLow < lastTotalUserLow ||
totalSys < lastTotalSys || totalIdle < lastTotalIdle){
//Overflow detection. Just skip this value.
percent = -1.0;
} else{
total = (totalUser - lastTotalUser) + (totalUserLow - lastTotalUserLow) +
(totalSys - lastTotalSys);
percent = total;
total += (totalIdle - lastTotalIdle);
percent /= total;
percent *= 100;
}
lastTotalUser = totalUser;
lastTotalUserLow = totalUserLow;
lastTotalSys = totalSys;
lastTotalIdle = totalIdle;
printf("CPU...........: %.02f%%\n", percent);
}
static void print_memusage(void)
{
struct sysinfo meminfo;
memset(&meminfo, '\0', sizeof(struct sysinfo));
if (sysinfo(&meminfo) == 0) {
unsigned long long totalvmem = meminfo.totalram;
totalvmem += meminfo.totalswap;
totalvmem *= meminfo.mem_unit;
unsigned long long usedvmem = meminfo.totalram - meminfo.freeram;
usedvmem += meminfo.totalswap - meminfo.freeswap;
usedvmem *= meminfo.mem_unit;
printf("VMEM(used/max): %llu/%lld (Mb)\n", (usedvmem/(1024*1024)), (totalvmem/(1024*1024)));
}
}
#endif
#ifdef _HAS_SIGNAL
void SigIntHandler(int signum)
{
if (signum == SIGINT) {
doLoop = 0;
}
}
#endif
int main(int argc, char** argv)
{
struct timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
#ifdef _HAS_SIGNAL
signal(SIGINT, SigIntHandler);
#endif
#ifdef _HAS_SYSINFO
init_cpuusage();
#endif
int flags = fcntl(STDIN_FILENO, F_GETFL, 0);
fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK);
static struct termios oldt, newt;
tcgetattr(STDIN_FILENO, &oldt);
newt = oldt;
newt.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &newt);
printf("%s\n", txtheader);
fd_set fds;
time_t start = time(NULL);
time_t cur;
while (1) {
cur = time(NULL);
double diff = difftime(cur, start);
#if defined(_HAS_UTMP) || defined(_HAS_SYSINFO)
if ((unsigned int)diff % 60 == 0) {
struct tm localtime;
if (localtime_r(&cur, &localtime) != NULL) {
printf("--- %02d:%02d:%02d ---\n", localtime.tm_hour, localtime.tm_min, localtime.tm_sec);
}
#ifdef _HAS_UTMP
print_utmp();
#endif
#ifdef _HAS_SYSINFO
print_memusage();
print_cpuusage();
#endif
}
#endif
printf("\r( %0.fs )%s", diff, keymsg);
fflush(stdout);
fflush(stdin);
FD_ZERO(&fds);
FD_SET(STDIN_FILENO, &fds);
int ret = select(FD_SETSIZE, &fds, NULL, NULL, &tv);
if (doLoop == 1 && ret == 0) {
tv.tv_sec = 1;
tv.tv_usec = 0;
} else {
#ifdef _HAS_SIGNAL
signal(SIGINT, SIG_IGN);
#endif
printf("quit in 3 .. ");
fflush(stdout);
sleep(1);
printf("2 .. ");
fflush(stdout);
sleep(1);
printf("1 .. ");
fflush(stdout);
sleep(1);
printf("\n");
break;
}
if (FD_ISSET(STDIN_FILENO,&fds)) break;
}
while (getchar() != EOF) {}
tcsetattr( STDIN_FILENO, TCSANOW, &oldt);
return 0;
}
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