/* a program that performs simple operations */
int main(int ac, char **av)
{
int (*operation)(int, int);
int first_number;
int second_number;
char symbol;
int result;
if (!check_arguments_valid(ac) ||
!check_if_number(av[1]) ||
!check_if_number(av[3]) ||
!check_if_symbol(av[2]))
{
printf("Program exiting.\n");
return (1);
}
first_number = atoi(av[1]);
second_number = atoi(av[3]);
symbol = av[2][0];
/* select the appropriate function based on the operator symbol */
operation = get_op_func(symbol);
result = (*operation)(first_number, second_number);
printf("%d\n", result);
return (0);
}
int main(int argc, char **argv) {
if (argc < 2)
return 1;
printf("%d\n", check_if_number(argv[1]));
return 0;
}
void pidaux ()
{
DIR *dirp;
FILE *fp;
struct dirent *entry;
char path[MAX_BUF], read_buf[MAX_BUF],temp_buf[MAX_BUF];
char uid_int_str[INT_SIZE_BUF]={0},*line;
char uptime_str[UP_TIME_SIZE];
char *user,*command;
size_t len=0;
dirp = opendir ("/proc/");
if (dirp == NULL)
{
perror ("Fail");
exit(0);
}
strcpy(path,"/proc/");
strcat(path,"uptime");
fp=fopen(path,"r");
if(fp!=NULL)
{
getline(&line,&len,fp);
sscanf(line,"%s ",uptime_str);
}
long uptime=atof(uptime_str);
long Hertz=sysconf(_SC_CLK_TCK);
strcpy(path,"/proc/");
strcat(path,"meminfo");
fp=fopen(path,"r");
unsigned long long total_memory;
if(fp!=NULL)
{
getline(&line,&len,fp);
sscanf(line,"MemTotal: %llu kB",&total_memory);
}
while ((entry = readdir (dirp)) != NULL)
{
if (check_if_number (entry->d_name))
{
strcpy(path,"/proc/");
strcat(path,entry->d_name);
strcat(path,"/status");
unsigned long long memory_rss;
fp=fopen(path,"r");
unsigned long long vmsize;
if(fp!=NULL)
{
vmsize=0;
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
sscanf(line,"Uid: %s ",uid_int_str);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
sscanf(line,"VmSize: %llu kB",&vmsize);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
sscanf(line,"VmRSS: %llu kB",&memory_rss);
}
else
{
fprintf(stdout,"FP is NULL\n");
}
float memory_usage=100*memory_rss/total_memory;
strcpy(path,"/proc/");
strcat(path,entry->d_name);
strcat(path,"/stat");
fp=fopen(path,"r");
getline(&line,&len,fp);
char comm[10],state;
unsigned int flags;
int pid,ppid,pgrp,session,tty_nr,tpgid;
unsigned long minflt,cminflt,majflt,cmajflt,utime,stime;
unsigned long long starttime;
long cutime,cstime,priority,nice,num_threads,itreavalue;
sscanf(line,"%d %s %c %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %llu",&pid,comm,&state,&ppid,&pgrp,&session,&tty_nr,&tpgid,&flags,&minflt,&cminflt,&majflt,&cmajflt,&utime,&stime,&cutime,&cstime,&priority,&nice,&num_threads,&itreavalue,&starttime);
unsigned long total_time=utime+stime;
total_time=total_time+(unsigned long)cutime+(unsigned long)cstime;
float seconds=uptime-(starttime/Hertz);
float cpu_usage=100*((total_time/Hertz)/seconds);
if(isnan(cpu_usage))
{
cpu_usage=0.0;
}
if(isnan(memory_usage))
{
memory_usage=0.0;
}
strcpy (path, "/proc/");
strcat (path, entry->d_name);
strcat (path, "/comm");
fp = fopen (path, "r");
if (fp != NULL)
{
fscanf (fp, "%s", read_buf);
fclose(fp);
}
char *userName=getUserName(atoi(uid_int_str));
if(strlen(userName)<9)
{
user=userName;
}
else
{
user=uid_int_str;
}
fprintf(stdout,"%s %s %0.1f %0.1f %llu %llu %c %s\n",user,entry->d_name,cpu_usage,memory_usage,vmsize,memory_rss,state,read_buf);
}
}
closedir (dirp);
}
int *pidof (char *pname)
{
DIR *dirp;
FILE *fp;
struct dirent *entry;
int *pidlist, pidlist_index = 0, pidlist_realloc_count = 1;
char path[MAX_BUF], read_buf[MAX_BUF];
dirp = opendir ("/proc/");
if (dirp == NULL)
{
perror ("Fail");
return NULL;
}
pidlist = malloc (sizeof (int) * PID_LIST_BLOCK);
if (pidlist == NULL)
{
return NULL;
}
while ((entry = readdir (dirp)) != NULL)
{
if (check_if_number (entry->d_name))
{
strcpy (path, "/proc/");
strcat (path, entry->d_name);
strcat (path, "/comm");
/* A file may not exist, it may have been removed.
* due to termination of the process. Actually we need to
* make sure the error is actually file does not exist to
* be accurate.
*/
fp = fopen (path, "r");
if (fp != NULL)
{
fscanf (fp, "%s", read_buf);
if (strcmp (read_buf, pname) == 0)
{
/* add to list and expand list if needed */
pidlist[pidlist_index++] = atoi (entry->d_name);
if (pidlist_index == PID_LIST_BLOCK * pidlist_realloc_count)
{
pidlist_realloc_count++;
pidlist = realloc (pidlist, sizeof (int) * PID_LIST_BLOCK * pidlist_realloc_count); //Error check todo
if (pidlist == NULL)
{
return NULL;
}
}
}
fclose (fp);
}
}
}
closedir (dirp);
pidlist[pidlist_index] = -1; /* indicates end of list */
return pidlist;
}
void pidaux ()
{
DIR *dirp;
FILE *fp;
struct dirent *entry;
char path[MAX_BUF], read_buf[MAX_BUF],temp_buf[MAX_BUF];
char uid_int_str[INT_SIZE_BUF]={0},*line;
char uptime_str[UP_TIME_SIZE];
char *user,*command;
size_t len=0;
dirp = opendir ("/proc/");
if (dirp == NULL)
{
perror ("Fail");
exit(0);
}
strcpy(path,"/proc/");
strcat(path,"uptime");
fp=fopen(path,"r");
if(fp!=NULL)
{
getline(&line,&len,fp);
sscanf(line,"%s ",uptime_str);
}
long uptime=atof(uptime_str);
long Hertz=sysconf(_SC_CLK_TCK);
strcpy(path,"/proc/");
strcat(path,"meminfo");
fp=fopen(path,"r");
unsigned long long total_memory;
if(fp!=NULL)
{
getline(&line,&len,fp);
sscanf(line,"MemTotal: %llu kB",&total_memory);
}
fprintf(stdout,"USER\t PID CPU %MEM VSZ RSS STAT START COMMAND\n");
while ((entry = readdir (dirp)) != NULL)
{
if (check_if_number (entry->d_name))
{
char fmt_time[20];
strcpy(path,"/proc/");
strcat(path,entry->d_name);
struct stat info;
stat(path,&info);
struct tm * timeinfo = localtime(&info.st_ctime); // or gmtime() depending on what you want
char t_info[20];
strftime(t_info,20,"%H:%M",timeinfo);
strcat(path,"/status");
unsigned long long memory_rss;
fp=fopen(path,"r");
unsigned long long vmsize;
//fprintf(stdout,"%s ",entry->d_name);
if(fp!=NULL)
{
vmsize=0;
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
sscanf(line,"Uid: %s ",uid_int_str);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
sscanf(line,"VmSize: %llu kB",&vmsize);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
getline(&line,&len,fp);
sscanf(line,"VmRSS: %llu kB",&memory_rss);
//fprintf(stdout,"VmRSS::%llu",memory_rss);
}
else
{
fprintf(stdout,"FP is NULL\n");
}
float memory_usage=100*memory_rss/total_memory;
strcpy(path,"/proc/");
strcat(path,entry->d_name);
strcat(path,"/stat");
//getline(&line,&len,fp);
fp=fopen(path,"r");
getline(&line,&len,fp);
char comm[10],state;
unsigned int flags;
int pid,ppid,pgrp,session,tty_nr,tpgid;
unsigned long minflt,cminflt,majflt,cmajflt,utime,stime;
unsigned long long starttime;
long cutime,cstime,priority,nice,num_threads,itreavalue;
sscanf(line,"%d %s %c %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %llu",&pid,comm,&state,&ppid,&pgrp,&session,&tty_nr,&tpgid,&flags,&minflt,&cminflt,&majflt,&cmajflt,&utime,&stime,&cutime,&cstime,&priority,&nice,&num_threads,&itreavalue,&starttime);
unsigned long total_time=utime+stime;
total_time=total_time+(unsigned long)cutime+(unsigned long)cstime;
float seconds=uptime-(starttime/Hertz);
float cpu_usage=100*((total_time/Hertz)/seconds);
if(isnan(cpu_usage))
{
cpu_usage=0.0;
}
if(isnan(memory_usage))
{
memory_usage=0.0;
}
strcpy (path, "/proc/");
strcat (path, entry->d_name);
strcat (path, "/comm");
/* A file may not exist, it may have been removed.
* dut to termination of the process. Actually we need to
* make sure the error is actually file does not exist to
* be accurate.
*/
fp = fopen (path, "r");
if (fp != NULL)
{
fscanf (fp, "%s", read_buf);
fclose(fp);
}
char *userName=getUserName(atoi(uid_int_str));
if(strlen(userName)<9)
{
user=userName;
}
else
{
user=uid_int_str;
}
fprintf(stdout,"%-8s %5d %2.1f %2.1f %7llu %7llu %c \t %s %-s\n",user,atoi(entry->d_name),cpu_usage,memory_usage,vmsize,memory_rss,state,t_info,read_buf);
}
}
closedir (dirp);
}
