root / prex-0.9.0 / usr / server / proc / proc_pid.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005-2007, 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 | * pid.c - service for process id.
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32 | */
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33 | |||
34 | #include <sys/prex.h> |
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35 | #include <ipc/proc.h> |
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36 | #include <ipc/ipc.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 | #include <stdlib.h> |
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42 | #include <string.h> |
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43 | |||
44 | #include "proc.h" |
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45 | |||
46 | /*
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47 | * getpid - get the process ID.
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48 | */
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49 | pid_t |
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50 | sys_getpid(void)
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51 | { |
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52 | |||
53 | ASSERT(curproc); |
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54 | return curproc->p_pid;
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55 | } |
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56 | |||
57 | /*
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58 | * getppid - get the parent process ID.
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59 | */
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60 | pid_t |
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61 | sys_getppid(void)
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62 | { |
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63 | |||
64 | ASSERT(curproc); |
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65 | return curproc->p_parent->p_pid;
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66 | } |
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67 | |||
68 | /*
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69 | * getpgid - get the process group ID for a process.
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70 | *
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71 | * If the specified pid is equal to 0, it returns the process
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72 | * group ID of the calling process.
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73 | */
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74 | int
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75 | sys_getpgid(pid_t pid, pid_t *retval) |
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76 | { |
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77 | struct proc *p;
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78 | |||
79 | ASSERT(curproc); |
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80 | |||
81 | if (pid == 0) |
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82 | p = curproc; |
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83 | else {
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84 | if ((p = p_find(pid)) == NULL) |
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85 | return ESRCH;
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86 | } |
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87 | *retval = p->p_pgrp->pg_pgid; |
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88 | return 0; |
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89 | } |
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90 | |||
91 | /*
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92 | * getsid - get the process group ID of a session leader.
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93 | */
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94 | int
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95 | sys_getsid(pid_t pid, pid_t *retval) |
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96 | { |
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97 | pid_t sid; |
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98 | struct proc *p, *leader;
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99 | |||
100 | ASSERT(curproc); |
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101 | |||
102 | if (pid == 0) |
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103 | p = curproc; |
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104 | else {
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105 | if ((p = p_find(pid)) == NULL) |
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106 | return ESRCH;
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107 | } |
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108 | leader = p->p_pgrp->pg_session->s_leader; |
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109 | sid = leader->p_pid; |
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110 | |||
111 | DPRINTF(("proc: getsid sid=%d\n", sid));
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112 | *retval = sid; |
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113 | return 0; |
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114 | } |
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115 | |||
116 | /*
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117 | * Move process to a new or existing process group.
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118 | */
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119 | int
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120 | enterpgrp(struct proc *p, pid_t pgid)
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121 | { |
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122 | struct pgrp *pgrp;
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123 | |||
124 | DPRINTF(("proc: enter pgrp pid=%d pgid=%d\n", p->p_pid, pgid));
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125 | if ((pgrp = pg_find(pgid)) == NULL) { |
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126 | /*
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127 | * Create a new process group.
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128 | */
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129 | DPRINTF(("proc: create new pgrp\n"));
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130 | if ((pgrp = malloc(sizeof(struct pgrp))) == NULL) |
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131 | return ENOMEM;
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132 | memset(pgrp, 0, sizeof(*pgrp)); |
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133 | list_init(&pgrp->pg_members); |
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134 | pgrp->pg_pgid = pgid; |
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135 | pg_add(pgrp); |
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136 | } |
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137 | /*
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138 | * Remove from the old process group.
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139 | * And, join an existing process group.
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140 | */
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141 | list_remove(&p->p_pgrp_link); |
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142 | list_insert(&pgrp->pg_members, &p->p_pgrp_link); |
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143 | pgrp->pg_session = curproc->p_pgrp->pg_session; |
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144 | p->p_pgrp = pgrp; |
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145 | return 0; |
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146 | } |
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147 | |||
148 | /*
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149 | * Remove process from process group.
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150 | */
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151 | int
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152 | leavepgrp(struct proc *p)
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153 | { |
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154 | struct pgrp *pgrp = p->p_pgrp;
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155 | |||
156 | list_remove(&p->p_pgrp_link); |
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157 | if (list_empty(&pgrp->pg_members)) {
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158 | |||
159 | /* XXX: do some work for session */
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160 | |||
161 | pg_remove(pgrp); |
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162 | free(pgrp); |
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163 | } |
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164 | p->p_pgrp = 0;
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165 | return (0); |
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166 | } |
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167 | |||
168 | |||
169 | /*
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170 | * setpgid - set process group ID for job control.
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171 | *
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172 | * If the specified pid is equal to 0, the process ID of
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173 | * the calling process is used. Also, if pgid is 0, the process
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174 | * ID of the indicated process is used.
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175 | */
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176 | int
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177 | sys_setpgid(pid_t pid, pid_t pgid) |
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178 | { |
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179 | struct proc *p;
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180 | |||
181 | DPRINTF(("proc: setpgid pid=%d pgid=%d\n", pid, pgid));
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182 | |||
183 | if (pid == 0) |
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184 | p = curproc; |
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185 | else {
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186 | if ((p = p_find(pid)) == NULL) |
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187 | return ESRCH;
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188 | } |
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189 | if (pgid < 0) |
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190 | return EINVAL;
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191 | if (pgid == 0) |
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192 | pgid = p->p_pid; |
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193 | if (p->p_pgrp->pg_pgid == pgid) /* already leader */ |
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194 | return 0; |
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195 | return (enterpgrp(p, pgid));
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196 | } |
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197 | |||
198 | /*
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199 | * setsid - create session and set process group ID.
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200 | */
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201 | int
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202 | sys_setsid(pid_t *retval) |
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203 | { |
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204 | struct proc *p;
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205 | struct pgrp *pgrp;
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206 | struct session *sess;
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207 | int error;
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208 | |||
209 | DPRINTF(("proc: setsid sid=%d\n", curproc->p_pid));
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210 | |||
211 | p = curproc; |
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212 | if (p->p_pid == p->p_pgrp->pg_pgid) /* already leader */ |
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213 | return EPERM;
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214 | |||
215 | if ((sess = malloc(sizeof(struct session))) == NULL) |
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216 | return ENOMEM;
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217 | memset(sess, 0, sizeof(*sess)); |
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218 | |||
219 | /*
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220 | * Create a new process group.
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221 | */
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222 | if ((error = enterpgrp(p, p->p_pid)) != 0) { |
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223 | free(sess); |
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224 | return error;
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225 | } |
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226 | pgrp = p->p_pgrp; |
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227 | |||
228 | /*
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229 | * Create a new session.
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230 | */
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231 | sess->s_refcnt = 1;
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232 | sess->s_leader = p; |
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233 | sess->s_ttyhold = 0;
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234 | pgrp->pg_session = sess; |
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235 | |||
236 | *retval = p->p_pid; |
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237 | return 0; |
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238 | } |