Annotation of prex/usr/lib/posix/process/setpriority.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2007, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <prex/prex.h>
! 31: #include <prex/posix.h>
! 32: #include <server/proc.h>
! 33: #include <sys/resource.h>
! 34:
! 35: #include <stddef.h>
! 36: #include <unistd.h>
! 37: #include <errno.h>
! 38:
! 39: /*
! 40: * setpriority - set priority for process or process group.
! 41: *
! 42: * Note: support only for current process.
! 43: */
! 44: int
! 45: setpriority(int which, int who, int prio)
! 46: {
! 47: int err, val;
! 48:
! 49: switch (which) {
! 50: case PRIO_PROCESS:
! 51: case PRIO_PGRP:
! 52: if (who != 0) {
! 53: errno = EPERM;
! 54: return -1;
! 55: }
! 56: break;
! 57: case PRIO_USER:
! 58: if (who != 1) {
! 59: errno = EPERM;
! 60: return -1;
! 61: }
! 62: break;
! 63: default:
! 64: errno = EINVAL;
! 65: return -1;
! 66: }
! 67:
! 68: if (prio < PRIO_MIN)
! 69: prio = PRIO_MIN;
! 70: if (prio > PRIO_MAX)
! 71: prio = PRIO_MAX;
! 72:
! 73: val = CONFIG_USER_PRIO + prio;
! 74:
! 75: err = thread_setprio(thread_self(), val);
! 76: if (err)
! 77: errno = err;
! 78: return -1;
! 79: }
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