init commit

Maximum_limit_stress_test/stress.c

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define DEFAULT_NUM_LEN 512
+
+char *itoa(long num, char *strnum, size_t size){
+  int isNegative = 0;
+
+  
+  if(num == 0){
+    strnum[0] = '0';
+    strnum[1] = '\0';
+    return strnum;
+  }
+  
+  if(num < 0){
+    isNegative = 1;
+    num = -num;
+  }
+  
+  int counter = 0;
+  while(num > 0 && counter <(int)(size-1)){
+      strnum[counter] = num % 10 + '0';
+      num /= 10;
+      counter ++;
+  }
+  
+  if(isNegative){
+    strnum[counter] = '-';
+    counter++;
+  } 
+  
+  strnum[counter] = '\0';
+  
+  for(int i=0; i<counter/2; i++){
+    char temp = strnum[i];
+    strnum[i] = strnum[counter-1-i];
+    strnum[counter-1-i] = temp; 
+  }
+
+  return strnum;
+}
+
+int main(){
+  int fd = open("count_file.txt",O_CREAT | O_WRONLY | O_TRUNC,0600);
+  long count = 0; 
+  char intstr[DEFAULT_NUM_LEN];
+  while(1){
+    pid_t pid = fork();
+    
+    if(pid < 0){
+      perror("fork");
+      break;
+    }
+
+    if(pid == 0){
+      sleep(100);
+      return 0;
+    }
+
+    count++;
+    lseek(fd,0,SEEK_SET);
+    memset(intstr,0,sizeof(intstr));
+    itoa(count,intstr,DEFAULT_NUM_LEN);
+    write(fd,intstr,strlen(intstr));
+  }
+  
+  close(fd);
+  printf("Max forks: %ld\n",count);
+
+  while(wait(NULL) > 0);
+  
+
+  return 0;
+}