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89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/* Support code for dealing with priorities in the Hurd.
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Copyright (C) 1994-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <hurd.h>
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#include <hurd/resource.h>
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#include <sys/mman.h>
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#include <unistd.h>
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error_t
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_hurd_priority_which_map (enum __priority_which which, int who,
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error_t (*function) (pid_t, struct procinfo *),
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int pi_flags)
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{
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mach_msg_type_number_t npids = 64, i;
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pid_t pidbuf[npids], *pids = pidbuf;
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error_t err;
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struct procinfo *pip;
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int pibuf[sizeof *pip + 5 * sizeof (pip->threadinfos[0])], *pi = pibuf;
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mach_msg_type_number_t pisize = sizeof (pibuf) / sizeof (int);
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switch (which)
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{
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default:
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return EINVAL;
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case PRIO_PROCESS:
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err = (*function) (who ?: getpid (), 0); /* XXX special-case self? */
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break;
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case PRIO_PGRP:
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err = __USEPORT (PROC, __proc_getpgrppids (port, who, &pids, &npids));
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for (i = 0; !err && i < npids; ++i)
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err = (*function) (pids[i], 0);
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break;
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case PRIO_USER:
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if (who == 0)
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who = geteuid ();
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err = __USEPORT (PROC, __proc_getallpids (port, &pids, &npids));
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for (i = 0; !err && i < npids; ++i)
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{
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/* Get procinfo to check the owner. */
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int *oldpi = pi;
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mach_msg_type_number_t oldpisize = pisize;
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char *tw = 0;
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size_t twsz = 0;
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err = __USEPORT (PROC, __proc_getprocinfo (port, pids[i],
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&pi_flags,
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&pi, &pisize,
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&tw, &twsz));
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if (!err)
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{
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if (twsz) /* Gratuitous. */
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__munmap (tw, twsz);
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if (pi != oldpi && oldpi != pibuf)
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/* Old buffer from last call was not reused; free it. */
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__munmap (oldpi, oldpisize * sizeof pi[0]);
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pip = (struct procinfo *) pi;
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if (pip->owner == (uid_t) who)
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err = (*function) (pids[i], pip);
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}
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}
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break;
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}
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if (pids != pidbuf)
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__munmap (pids, npids * sizeof pids[0]);
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if (pi != pibuf)
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__munmap (pi, pisize * sizeof pi[0]);
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return err;
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}
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