Code-Bin #467

untitled C Code
Posted by: Jaa | January 28, 2010 @ 12:39am

C Code

#include <stdlib.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <dirent.h>
	#include <errno.h>
	#include <ctype.h>
	#include <string.h>

int main (int argc, char *argv[]) {

DIR		*dir_pointer, *proc_dir;
	struct dirent	*dir_structure, *proc_struct;

FILE 		*fp;
	
	int pid, ppid;
	char *pname;
	char pstate;
	
	int i = 0;

/*open directory stream*/
	dir_pointer = opendir("/proc/");
	printf("openning /proc/ dir\n");

char *digit_dir;	//all process id
	char **subdir;		//subdirectory for the processes
	subdir = (char**) calloc(sizeof(char**), 5000); 
	//store at least 5000 processes
	int j = 0; 
	/*reading reading files and directory*/
	while((dir_structure = readdir(dir_pointer)))
	{
		i++;
		digit_dir = (char*) (dir_structure->d_name);

//store only directory that are process ID
		if(isdigit(dir_structure->d_name[0])){ 
		subdir[j]= (char*) dir_structure->d_name;
		j++;
		}

}

char *root = "/proc/";	
	char *file;
	char *new;

printf("pid \t pname \t \t \t pstate \t ppid\n");
	while(*(subdir)!=NULL){

new = (char *)calloc(strlen(root) + strlen(*subdir) + 1, sizeof(char));
		strcat(new, root);
		strcat(new, *subdir);

file = (char *)calloc(strlen(new) + strlen("stats") + 1, sizeof(char));
	strcat(file, new);
	strcat(file, "/stat");
	
	
	fp = fopen(file,"r");
	if (fp == NULL) perror ("Error opening file");
		else {

pname = (char*) calloc(sizeof(char*),10); 
		fscanf(fp, "%d", &pid);
		fscanf(fp, "%s", pname);
		fscanf(fp, "%c", &pstate);
		fscanf(fp, "%d", &ppid);
		
		
		printf("%d\t%s\t\t%c\t\t\t\t%d\n",pid,pname,pstate,ppid);

fclose (fp);
		}

*(subdir++);

}

return 0;
	}

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Author Comments

code reading process state information from proc

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