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[glibc.git] / hurd / hurdprio.c
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1 /* Support code for dealing with priorities in the Hurd.
2 Copyright (C) 1994,95,96,97,99 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <hurd.h>
21 #include <hurd/resource.h>
22 #include <sys/mman.h>
23 #include <unistd.h>
25 error_t
26 _hurd_priority_which_map (enum __priority_which which, int who,
27 error_t (*function) (pid_t, struct procinfo *),
28 int pi_flags)
30 mach_msg_type_number_t npids = 64, i;
31 pid_t pidbuf[npids], *pids = pidbuf;
32 error_t err;
33 struct procinfo *pip;
34 int pibuf[sizeof *pip + 5 * sizeof (pip->threadinfos[0])], *pi = pibuf;
35 mach_msg_type_number_t pisize = sizeof (pibuf) / sizeof (int);
37 switch (which)
39 default:
40 return EINVAL;
42 case PRIO_PROCESS:
43 err = (*function) (who ?: getpid (), 0); /* XXX special-case self? */
44 break;
46 case PRIO_PGRP:
47 err = __USEPORT (PROC, __proc_getpgrppids (port, who, &pids, &npids));
48 for (i = 0; !err && i < npids; ++i)
49 err = (*function) (pids[i], 0);
50 break;
52 case PRIO_USER:
53 if (who == 0)
54 who = geteuid ();
55 err = __USEPORT (PROC, __proc_getallpids (port, &pids, &npids));
56 for (i = 0; !err && i < npids; ++i)
58 /* Get procinfo to check the owner. */
59 int *oldpi = pi;
60 mach_msg_type_number_t oldpisize = pisize;
61 char *tw = 0;
62 size_t twsz = 0;
63 err = __USEPORT (PROC, __proc_getprocinfo (port, pids[i],
64 &pi_flags,
65 &pi, &pisize,
66 &tw, &twsz));
67 if (!err)
69 if (twsz) /* Gratuitous. */
70 __munmap (tw, twsz);
71 if (pi != oldpi && oldpi != pibuf)
72 /* Old buffer from last call was not reused; free it. */
73 __munmap (oldpi, oldpisize * sizeof pi[0]);
75 pip = (struct procinfo *) pi;
76 if (pip->owner == (uid_t) who)
77 err = (*function) (pids[i], pip);
80 break;
83 if (pids != pidbuf)
84 __munmap (pids, npids * sizeof pids[0]);
85 if (pi != pibuf)
86 __munmap (pi, pisize * sizeof pi[0]);
88 return err;