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/* Support code for dealing with priorities in the Hurd.
Copyright (C) 1994-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/resource.h>
#include <sys/mman.h>
#include <unistd.h>
error_t
_hurd_priority_which_map (enum __priority_which which, int who,
error_t (*function) (pid_t, struct procinfo *),
int pi_flags)
{
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;
mach_msg_type_number_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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