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1 | /* Support code for dealing with priorities in the Hurd. | |
2 | Copyright (C) 1994-2024 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 | mach_msg_type_number_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 | } |