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AGENT.c
172 lines (146 loc) · 3.25 KB
/
AGENT.c
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#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
void checkSupplies()
{
char * paperStr = getenv("PAPER");
int paper = atoi(paperStr);
char * tobaccoStr = getenv("TOBACCO");
int tobacco = atoi(tobaccoStr);
char * matchesStr = getenv("MATCHES");
int matches = atoi(matchesStr);
if (paper <= 0) {
printf("NO PAPER!\n\n");
fflush(stdout);
exit(0);
} else if (tobacco <= 0) {
printf("NO TOBACCO!\n\n");
fflush(stdout);
exit(0);
} else if (matches <= 0) {
printf("NO MATCHES!\n\n");
fflush(stdout);
exit(0);
}
}
void listAvaliable()
{
printf("PAPER IS AVAILABLE! P:%s\n", getenv("PAPER"));
printf("TOBACCO IS AVAILABLE! T:%s\n", getenv("TOBACCO"));
printf("MATCHES ARE AVAILABLE! M:%s\n", getenv("MATCHES"));
}
void printInfo()
{
printf("AGENT INFO:\n");
char hostName[256];
gethostname(hostName, sizeof(hostName));
printf("HOSTNAME:%s\n", hostName);
printf("PID:%d\n", getpid());
printf("UID:%d\n", getuid());
time_t now;
time(&now);
printf("TIME:%s\n", ctime(&now));
printf("PAPER:%s, TOBACCO:%s, MATCHES:%s\n", getenv("PAPER"), getenv("TOBACCO"), getenv("MATCHES"));
}
void initializeSuplies(int paper, int tobacco, int matches)
{
char paperBuffer[10];
snprintf(paperBuffer, 10, "%d", paper);
setenv("PAPER", paperBuffer, 1);
char tobaccoBuffer[10];
snprintf(tobaccoBuffer, 10, "%d", tobacco);
setenv("TOBACCO", tobaccoBuffer, 1);
char matchesBuffer[10];
snprintf(matchesBuffer, 10, "%d", matches);
setenv("MATCHES", matchesBuffer, 1);
}
void consume()
{
char *paperStr = getenv("PAPER");
int paper = atoi(paperStr) - 1;
char paperBuffer[10];
snprintf(paperBuffer, 10, "%d", paper);
setenv("PAPER", paperBuffer, 1);
char *tobaccoStr = getenv("TOBACCO");
int tobacco = atoi(tobaccoStr) - 1;
char tobaccoBuffer[10];
snprintf(tobaccoBuffer, 10, "%d", tobacco);
setenv("TOBACCO", tobaccoBuffer, 1);
char *matchesStr = getenv("MATCHES");
int matches = atoi(matchesStr) - 1;
char matchesBuffer[10];
snprintf(matchesBuffer, 10, "%d", matches);
setenv("MATCHES", matchesBuffer, 1);
}
void wait()
{
sleep(2);
}
void smoke()
{
checkSupplies();
listAvaliable();
printf("SMOKING!\n\n");
}
void forkSmokers()
{
printf("FORKING THREE SMOKERS!\n\n");
pid_t S1 = fork();
if (S1 == 0) {
//forked properly
printf("SMOKER S1:%d\n", getpid());
smoke();
fflush(stdout);
exit(0);
} else if (S1 < 0) {
perror("Failed to fork");
} else {
wait();
consume();
pid_t S2 = fork();
if (S2 == 0) {
printf("SMOKER S2:%d\n", getpid());
smoke();
fflush(stdout);
exit(0);
} else if (S2 < 0) {
perror("Failed to fork");
} else {
wait();
consume();
pid_t S3 = fork();
if (S3 == 0) {
printf("SMOKER S3:%d\n", getpid());
smoke();
fflush(stdout);
exit(0);
} else if (S3 < 0) {
perror("Failed to fork");
}
}
}
}
void smokeScenario(int paper, int tobacco, int matches)
{
initializeSuplies(paper, tobacco, matches);
printInfo();
forkSmokers();
wait();
printf("AGENT IS DONE!\n-----\n");
}
int main()
{
printf("Scenario 1\n");
smokeScenario(2, 2, 2);
printf("Scenario 2\n");
smokeScenario(1, 1, 1);
printf("Scenario 3\n");
smokeScenario(2, 2, 1);
printf("Scenario 4\n");
smokeScenario(2, 1, 0);
fflush(stdout);
exit(0);
return 0;
}