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1 | /* Copyright (C) 1994-2015 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, see | |
16 | <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <hurd.h> | |
19 | #include <hurd/resource.h> | |
20 | ||
21 | /* Set the priority of all processes specified by WHICH and WHO | |
22 | to PRIO. Returns 0 on success, -1 on errors. */ | |
23 | int | |
24 | setpriority (enum __priority_which which, id_t who, int prio) | |
25 | { | |
26 | error_t err; | |
27 | error_t pidloser, priloser; | |
28 | unsigned int npids, ntasks, nwin, nperm, nacces; | |
29 | ||
30 | error_t setonepriority (pid_t pid, struct procinfo *pi) | |
31 | { | |
32 | task_t task; | |
33 | error_t piderr = __USEPORT (PROC, __proc_pid2task (port, pid, &task)); | |
34 | if (piderr == EPERM) | |
35 | ++nperm; | |
36 | if (piderr != ESRCH) | |
37 | { | |
38 | ++npids; | |
39 | if (piderr && piderr != EPERM) | |
40 | pidloser = piderr; | |
41 | } | |
42 | if (! piderr) | |
43 | { | |
44 | error_t prierr; | |
45 | ++ntasks; | |
46 | #ifdef POLICY_TIMESHARE_BASE_COUNT | |
47 | { | |
48 | /* XXX This assumes timeshare policy. */ | |
49 | struct policy_timeshare_base base | |
50 | = { NICE_TO_MACH_PRIORITY (prio) }; | |
51 | prierr = __task_policy (task, POLICY_TIMESHARE, | |
52 | (policy_base_t) &base, | |
53 | POLICY_TIMESHARE_BASE_COUNT, | |
54 | 0, 1); | |
55 | } | |
56 | #else | |
57 | prierr = __task_priority (task, NICE_TO_MACH_PRIORITY (prio), 1); | |
58 | #endif | |
59 | __mach_port_deallocate (__mach_task_self (), task); | |
60 | switch (prierr) | |
61 | { | |
62 | case KERN_FAILURE: | |
63 | ++nacces; | |
64 | break; | |
65 | case KERN_SUCCESS: | |
66 | ++nwin; | |
67 | break; | |
68 | case KERN_INVALID_ARGUMENT: /* Task died. */ | |
69 | --npids; | |
70 | --ntasks; | |
71 | break; | |
72 | default: | |
73 | priloser = prierr; | |
74 | } | |
75 | } | |
76 | return 0; | |
77 | } | |
78 | ||
79 | npids = ntasks = nwin = nperm = nacces = 0; | |
80 | pidloser = priloser = 0; | |
81 | err = _hurd_priority_which_map (which, who, setonepriority, 0); | |
82 | ||
83 | if (!err && npids == 0) | |
84 | /* No error, but no pids found. */ | |
85 | err = ESRCH; | |
86 | else if (nperm == npids) | |
87 | /* Got EPERM from proc_task2pid for every process. */ | |
88 | err = EPERM; | |
89 | else if (nacces == ntasks) | |
90 | /* Got KERN_FAILURE from task_priority for every task. */ | |
91 | err = EACCES; | |
92 | else if (nwin == 0) | |
93 | err = pidloser ?: priloser; | |
94 | ||
95 | return err ? __hurd_fail (err) : 0; | |
96 | } | |
97 | libc_hidden_def (setpriority) |