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glibc/hurd/hurdprio.c
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/* Support code for dealing with priorities in the Hurd. | |
Copyright (C) 1994-2016 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 | |
<http://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; | |
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; | |
} |