root / prex-0.9.0 / usr / server / proc / proc_sig.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005-2006, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * proc_sig.c - signal transfer.
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32 | */
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33 | |||
34 | #include <sys/prex.h> |
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35 | #include <sys/capability.h> |
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36 | #include <ipc/proc.h> |
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37 | #include <sys/list.h> |
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38 | |||
39 | #include <unistd.h> |
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40 | #include <errno.h> |
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41 | |||
42 | #include "proc.h" |
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43 | |||
44 | /*
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45 | * Check if current process has CAP_KILL capability.
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46 | */
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47 | static int |
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48 | kill_capable(void)
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49 | { |
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50 | |||
51 | if (task_chkcap(curproc->p_task, CAP_KILL) == 0) |
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52 | return 1; |
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53 | return 0; |
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54 | } |
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55 | |||
56 | /*
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57 | * Send a signal to the process.
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58 | */
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59 | static int |
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60 | sendsig(struct proc *p, int sig) |
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61 | { |
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62 | |||
63 | /*
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64 | * We never allow to send signal to the
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65 | * process server in any case.
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66 | */
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67 | if (p->p_pid == 0) |
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68 | return EPERM;
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69 | |||
70 | /*
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71 | * Filter signals for init process.
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72 | * This is for fail safe...
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73 | */
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74 | if (p->p_pid == 1 && sig != SIGCHLD) |
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75 | return EPERM;
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76 | |||
77 | DPRINTF(("proc: sendsig task=%x\n", p->p_task));
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78 | return exception_raise(p->p_task, sig);
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79 | } |
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80 | |||
81 | /*
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82 | * Send a signal to one process.
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83 | */
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84 | static int |
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85 | kill_one(pid_t pid, int sig)
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86 | { |
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87 | struct proc *p;
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88 | |||
89 | DPRINTF(("proc: killone pid=%d sig=%d\n", pid, sig));
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90 | |||
91 | if ((p = p_find(pid)) == NULL) |
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92 | return ESRCH;
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93 | return sendsig(p, sig);
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94 | } |
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95 | |||
96 | /*
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97 | * Send a signal to all process in the process group.
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98 | */
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99 | int
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100 | kill_pg(pid_t pgid, int sig)
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101 | { |
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102 | struct proc *p;
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103 | struct pgrp *pgrp;
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104 | list_t head, n; |
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105 | int error = 0; |
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106 | |||
107 | DPRINTF(("proc: killpg pgid=%d sig=%d\n", pgid, sig));
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108 | |||
109 | if ((pgrp = pg_find(pgid)) == NULL) |
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110 | return ESRCH;
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111 | |||
112 | head = &pgrp->pg_members; |
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113 | for (n = list_first(head); n != head; n = list_next(n)) {
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114 | p = list_entry(n, struct proc, p_pgrp_link);
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115 | if ((error = sendsig(p, sig)) != 0) |
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116 | break;
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117 | } |
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118 | return error;
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119 | } |
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120 | |||
121 | /*
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122 | * Send a signal.
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123 | *
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124 | * The behavior is different for the pid value.
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125 | *
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126 | * if (pid > 0)
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127 | * Send a signal to specific process.
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128 | *
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129 | * if (pid == 0)
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130 | * Send a signal to all processes in same process group.
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131 | *
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132 | * if (pid == -1)
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133 | * Send a signal to all processes except init.
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134 | *
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135 | * if (pid < -1)
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136 | * Send a signal to the process group.
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137 | *
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138 | * Note: Need CAP_KILL capability to send a signal to the different
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139 | * process/group.
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140 | */
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141 | int
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142 | sys_kill(pid_t pid, int sig)
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143 | { |
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144 | struct proc *p;
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145 | list_t n; |
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146 | int error = 0; |
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147 | |||
148 | DPRINTF(("proc: kill pid=%d sig=%d\n", pid, sig));
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149 | |||
150 | switch (sig) {
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151 | case SIGFPE:
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152 | case SIGILL:
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153 | case SIGSEGV:
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154 | return EINVAL;
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155 | } |
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156 | |||
157 | if (pid > 0) { |
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158 | if (pid != curproc->p_pid && !kill_capable()) {
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159 | DPRINTF(("proc: EPERM\n"));
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160 | return EPERM;
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161 | } |
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162 | error = kill_one(pid, sig); |
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163 | } |
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164 | else if (pid == -1) { |
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165 | DPRINTF(("proc: kill? curproc=%x\n", curproc));
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166 | if (!kill_capable())
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167 | return EPERM;
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168 | |||
169 | DPRINTF(("proc: kill all!\n"));
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170 | for (n = list_first(&allproc); n != &allproc;
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171 | n = list_next(n)) { |
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172 | p = list_entry(n, struct proc, p_link);
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173 | |||
174 | /*
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175 | * We don't send a signal to the following processes.
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176 | *
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177 | * pid=0 - process server
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178 | * pid=1 - init process
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179 | * curproc - current process (sleeping in msg_send)
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180 | */
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181 | if (p->p_pid != 0 && p->p_pid != 1 && |
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182 | p->p_pid != curproc->p_pid) |
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183 | { |
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184 | error = kill_one(p->p_pid, sig); |
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185 | if (error != 0) |
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186 | break;
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187 | } |
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188 | } |
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189 | } |
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190 | else if (pid == 0) { |
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191 | error = kill_pg(curproc->p_pgrp->pg_pgid, sig); |
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192 | } |
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193 | else { /* pid < -1 */ |
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194 | if (curproc->p_pgrp->pg_pgid != -pid && !kill_capable())
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195 | return EPERM;
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196 | error = kill_pg(-pid, sig); |
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197 | } |
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198 | return error;
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199 | } |