process_iterator.h

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#ifndef __PROCESS_ITERATOR_H
 
#define __PROCESS_ITERATOR_H
 
#include <unistd.h>
#include <limits.h>
#include <dirent.h>
 
//USER_HZ detection, from openssl code
#ifndef HZ
# if defined(_SC_CLK_TCK) \
     && (!defined(OPENSSL_SYS_VMS) || __CTRL_VER >= 70000000)
#  define HZ ((double)sysconf(_SC_CLK_TCK))
# else
#  ifndef CLK_TCK
#   ifndef _BSD_CLK_TCK_ /* FreeBSD hack */
#    define HZ  100.0
#   else /* _BSD_CLK_TCK_ */
#    define HZ ((double)_BSD_CLK_TCK_)
#   endif
#  else /* CLK_TCK */
#   define HZ ((double)CLK_TCK)
#  endif
# endif
#endif
 
#ifdef __FreeBSD__
#include <kvm.h>
#endif
 
// process descriptor
struct process {
  //pid of the process
  pid_t pid;
  //ppid of the process
  pid_t ppid;
  //start time (unix timestamp)
  int starttime;
  //cputime used by the process (in milliseconds)
  int cputime;
  //actual cpu usage estimation (value in range 0-1)
  double cpu_usage;
  //absolute path of the executable file
  char command[PATH_MAX+1];
};
 
struct process_filter {
  int pid;
  int include_children;
  char program_name[PATH_MAX+1];
};
 
struct process_iterator {
#ifdef __linux__
  DIR *dip;
  int boot_time;
#elif defined __FreeBSD__
  kvm_t *kd;
  struct kinfo_proc *procs;
  int count;
  int i;
#elif defined __APPLE__
  int i;
  int count;
  int *pidlist;
#endif
  struct process_filter *filter;
};
 
int init_process_iterator(struct process_iterator *i, struct process_filter *filter);
 
int get_next_process(struct process_iterator *i, struct process *p);
 
int close_process_iterator(struct process_iterator *i);
 
#endif