Annotation of prex/usr/server/proc/kill.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2006, 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: /*
! 31: * kill.c - signal transfer.
! 32: */
! 33:
! 34: #include <prex/prex.h>
! 35: #include <prex/capability.h>
! 36: #include <server/proc.h>
! 37: #include <sys/list.h>
! 38:
! 39: #include <unistd.h>
! 40: #include <errno.h>
! 41:
! 42: #include "proc.h"
! 43:
! 44: /*
! 45: * Send a signal to the process.
! 46: */
! 47: static int
! 48: send_sig(struct proc *p, int sig)
! 49: {
! 50:
! 51: if (p->p_pid == 0 || p->p_pid == 1)
! 52: return EPERM;
! 53:
! 54: DPRINTF(("proc: send_sig task=%x\n", p->p_task));
! 55: return exception_raise(p->p_task, sig);
! 56: }
! 57:
! 58: /*
! 59: * Send a signal to one process.
! 60: */
! 61: static int
! 62: kill_one(pid_t pid, int sig)
! 63: {
! 64: struct proc *p;
! 65:
! 66: DPRINTF(("proc: killone pid=%d sig=%d\n", pid, sig));
! 67:
! 68: if ((p = proc_find(pid)) == NULL)
! 69: return ESRCH;
! 70: return send_sig(p, sig);
! 71: }
! 72:
! 73: /*
! 74: * Send a signal to all process in the process group.
! 75: */
! 76: int
! 77: kill_pg(pid_t pgid, int sig)
! 78: {
! 79: struct proc *p;
! 80: struct pgrp *pgrp;
! 81: list_t head, n;
! 82: int err = 0;
! 83:
! 84: DPRINTF(("proc: killpg pgid=%d sig=%d\n", pgid, sig));
! 85:
! 86: if ((pgrp = pgrp_find(pgid)) == NULL)
! 87: return ESRCH;
! 88:
! 89: head = &pgrp->pg_members;
! 90: for (n = list_first(head); n != head; n = list_next(n)) {
! 91: p = list_entry(n, struct proc, p_link);
! 92: if ((err = send_sig(p, sig)) != 0)
! 93: break;
! 94: }
! 95: return err;
! 96: }
! 97:
! 98: /*
! 99: * Send a signal.
! 100: *
! 101: * The behavior is different for the pid value.
! 102: *
! 103: * if (pid > 0)
! 104: * Send a signal to specific process.
! 105: *
! 106: * if (pid == 0)
! 107: * Send a signal to all processes in same process group.
! 108: *
! 109: * if (pid == -1)
! 110: * Send a signal to all processes except init.
! 111: *
! 112: * if (pid < -1)
! 113: * Send a signal to the process group.
! 114: *
! 115: * Note: Need CAP_KILL capability to send a signal to the different
! 116: * process/group.
! 117: */
! 118: int
! 119: proc_kill(struct msg *msg)
! 120: {
! 121: pid_t pid;
! 122: struct proc *p;
! 123: list_t n;
! 124: int sig, capable = 0;
! 125: int err = 0;
! 126:
! 127: pid = (pid_t)msg->data[0];
! 128: sig = msg->data[1];
! 129:
! 130: DPRINTF(("proc: kill pid=%d sig=%d\n", pid, sig));
! 131:
! 132: switch (sig) {
! 133: case SIGFPE:
! 134: case SIGILL:
! 135: case SIGSEGV:
! 136: return EINVAL;
! 137: }
! 138:
! 139: if (curproc->p_cap & CAP_KILL)
! 140: capable = 1;
! 141:
! 142: if (pid > 0) {
! 143: if (pid != curproc->p_pid && !capable)
! 144: return EPERM;
! 145: err = kill_one(pid, sig);
! 146: }
! 147: else if (pid == -1) {
! 148: if (!capable)
! 149: return EPERM;
! 150: for (n = list_first(&allproc); n != &allproc;
! 151: n = list_next(n)) {
! 152: p = list_entry(n, struct proc, p_link);
! 153: if (p->p_pid != 0 && p->p_pid != 1) {
! 154: err = kill_one(p->p_pid, sig);
! 155: if (err != 0)
! 156: break;
! 157: }
! 158: }
! 159: }
! 160: else if (pid == 0) {
! 161: if ((p = proc_find(pid)) == NULL)
! 162: return ESRCH;
! 163: err = kill_pg(p->p_pgrp->pg_pgid, sig);
! 164: }
! 165: else {
! 166: if (curproc->p_pgrp->pg_pgid != -pid && !capable)
! 167: return EPERM;
! 168: err = kill_pg(-pid, sig);
! 169: }
! 170: return err;
! 171: }
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