1 | /* Support code for dealing with priorities in the Hurd. |
2 | Copyright (C) 1994-2022 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 | <https://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 | } |
89 | |