| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Support code for dealing with priorities in the Hurd. |
| 2 | Copyright (C) 1994-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <hurd.h> |
| 20 | #include <hurd/resource.h> |
| 21 | #include <sys/mman.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | error_t |
| 25 | _hurd_priority_which_map (enum __priority_which which, int who, |
| 26 | error_t (*function) (pid_t, struct procinfo *), |
| 27 | int pi_flags) |
| 28 | { |
| 29 | mach_msg_type_number_t npids = 64, i; |
| 30 | pid_t pidbuf[npids], *pids = pidbuf; |
| 31 | error_t err; |
| 32 | struct procinfo *pip; |
| 33 | int pibuf[sizeof *pip + 5 * sizeof (pip->threadinfos[0])], *pi = pibuf; |
| 34 | mach_msg_type_number_t pisize = sizeof (pibuf) / sizeof (int); |
| 35 | |
| 36 | switch (which) |
| 37 | { |
| 38 | default: |
| 39 | return EINVAL; |
| 40 | |
| 41 | case PRIO_PROCESS: |
| 42 | err = (*function) (who ?: getpid (), 0); /* XXX special-case self? */ |
| 43 | break; |
| 44 | |
| 45 | case PRIO_PGRP: |
| 46 | err = __USEPORT (PROC, __proc_getpgrppids (port, who, &pids, &npids)); |
| 47 | for (i = 0; !err && i < npids; ++i) |
| 48 | err = (*function) (pids[i], 0); |
| 49 | break; |
| 50 | |
| 51 | case PRIO_USER: |
| 52 | if (who == 0) |
| 53 | who = geteuid (); |
| 54 | err = __USEPORT (PROC, __proc_getallpids (port, &pids, &npids)); |
| 55 | for (i = 0; !err && i < npids; ++i) |
| 56 | { |
| 57 | /* Get procinfo to check the owner. */ |
| 58 | int *oldpi = pi; |
| 59 | mach_msg_type_number_t oldpisize = pisize; |
| 60 | char *tw = 0; |
| 61 | size_t twsz = 0; |
| 62 | err = __USEPORT (PROC, __proc_getprocinfo (port, pids[i], |
| 63 | &pi_flags, |
| 64 | &pi, &pisize, |
| 65 | &tw, &twsz)); |
| 66 | if (!err) |
| 67 | { |
| 68 | if (twsz) /* Gratuitous. */ |
| 69 | __munmap (tw, twsz); |
| 70 | if (pi != oldpi && oldpi != pibuf) |
| 71 | /* Old buffer from last call was not reused; free it. */ |
| 72 | __munmap (oldpi, oldpisize * sizeof pi[0]); |
| 73 | |
| 74 | pip = (struct procinfo *) pi; |
| 75 | if (pip->owner == (uid_t) who) |
| 76 | err = (*function) (pids[i], pip); |
| 77 | } |
| 78 | } |
| 79 | break; |
| 80 | } |
| 81 | |
| 82 | if (pids != pidbuf) |
| 83 | __munmap (pids, npids * sizeof pids[0]); |
| 84 | if (pi != pibuf) |
| 85 | __munmap (pi, pisize * sizeof pi[0]); |
| 86 | |
| 87 | return err; |
| 88 | } |