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glibc  2.9
Functions
hurdprio.c File Reference
#include <hurd.h>
#include <hurd/resource.h>
#include <sys/mman.h>
#include <unistd.h>

Go to the source code of this file.

Functions

error_t _hurd_priority_which_map (enum __priority_which which, int who, error_t(*function)(pid_t, struct procinfo *), int pi_flags)

Function Documentation

error_t _hurd_priority_which_map ( enum __priority_which  which,
int  who,
error_t(*)(pid_t, struct procinfo *)  function,
int  pi_flags 
)

Definition at line 26 of file hurdprio.c.

{
  mach_msg_type_number_t npids = 64, i;
  pid_t pidbuf[npids], *pids = pidbuf;
  error_t err;
  struct procinfo *pip;
  int pibuf[sizeof *pip + 5 * sizeof (pip->threadinfos[0])], *pi = pibuf;
  mach_msg_type_number_t pisize = sizeof (pibuf) / sizeof (int);

  switch (which)
    {
    default:
      return EINVAL;

    case PRIO_PROCESS:
      err = (*function) (who ?: getpid (), 0); /* XXX special-case self? */
      break;

    case PRIO_PGRP:
      err = __USEPORT (PROC, __proc_getpgrppids (port, who, &pids, &npids));
      for (i = 0; !err && i < npids; ++i)
       err = (*function) (pids[i], 0);
      break;

    case PRIO_USER:
      if (who == 0)
       who = geteuid ();
      err = __USEPORT (PROC, __proc_getallpids (port, &pids, &npids));
      for (i = 0; !err && i < npids; ++i)
       {
         /* Get procinfo to check the owner.  */
         int *oldpi = pi;
         mach_msg_type_number_t oldpisize = pisize;
         char *tw = 0;
         size_t twsz = 0;
         err = __USEPORT (PROC, __proc_getprocinfo (port, pids[i],
                                               &pi_flags,
                                               &pi, &pisize,
                                               &tw, &twsz));
         if (!err)
           {
             if (twsz)             /* Gratuitous.  */
              __munmap (tw, twsz);
             if (pi != oldpi && oldpi != pibuf)
              /* Old buffer from last call was not reused; free it.  */
              __munmap (oldpi, oldpisize * sizeof pi[0]);

             pip = (struct procinfo *) pi;
             if (pip->owner == (uid_t) who)
              err = (*function) (pids[i], pip);
           }
       }
      break;
    }

  if (pids != pidbuf)
    __munmap (pids, npids * sizeof pids[0]);
  if (pi != pibuf)
    __munmap (pi, pisize * sizeof pi[0]);

  return err;
}

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