Annotation of prex-old/usr/server/proc/pid.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2007, 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: /*
! 31: * pid.c - service for process id.
! 32: */
! 33:
! 34: #include <prex/prex.h>
! 35: #include <server/proc.h>
! 36: #include <server/stdmsg.h>
! 37: #include <sys/list.h>
! 38:
! 39: #include <unistd.h>
! 40: #include <errno.h>
! 41: #include <stdlib.h>
! 42:
! 43: #include "proc.h"
! 44:
! 45: /*
! 46: * PID previously allocated.
! 47: *
! 48: * Note: The following pids are reserved by default.
! 49: * pid = 0: Process server
! 50: * pid = 1: Init process
! 51: */
! 52: static pid_t last_pid = 1;
! 53:
! 54: /*
! 55: * Assign new pid.
! 56: * Returns pid on sucess, or 0 on failure.
! 57: */
! 58: pid_t
! 59: pid_assign(void)
! 60: {
! 61: pid_t pid;
! 62:
! 63: pid = last_pid + 1;
! 64: if (pid >= PID_MAX)
! 65: pid = 1;
! 66:
! 67: while (pid != last_pid) {
! 68: if (!proc_find(pid))
! 69: break;
! 70: if (++pid >= PID_MAX)
! 71: pid = 1;
! 72: }
! 73: if (pid == last_pid)
! 74: return 0;
! 75: last_pid = pid;
! 76: return pid;
! 77: }
! 78:
! 79: /*
! 80: * Get pid for specified task
! 81: */
! 82: int
! 83: proc_getpid(struct msg *msg)
! 84: {
! 85:
! 86: if (curproc == NULL)
! 87: return ESRCH;
! 88:
! 89: msg->data[0] = (int)curproc->pid;
! 90: return 0;
! 91: }
! 92:
! 93: /*
! 94: * Get ppid for specified task
! 95: */
! 96: int
! 97: proc_getppid(struct msg *msg)
! 98: {
! 99:
! 100: if (curproc == NULL)
! 101: return ESRCH;
! 102:
! 103: msg->data[0] = (int)curproc->parent->pid;
! 104: return 0;
! 105: }
! 106:
! 107: /*
! 108: * Get pgid for specified process.
! 109: */
! 110: int
! 111: proc_getpgid(struct msg *msg)
! 112: {
! 113: pid_t pid;
! 114: struct proc *p;
! 115:
! 116: pid = (pid_t)msg->data[0];
! 117: if ((p = proc_find(pid)) == NULL)
! 118: return ESRCH;
! 119:
! 120: msg->data[0] = (int)p->pgrp->pgid;
! 121: dprintf("proc getpgid=%x\n", msg->data[0]);
! 122: return 0;
! 123: }
! 124:
! 125: /*
! 126: * Set process group for specified process.
! 127: */
! 128: int
! 129: proc_setpgid(struct msg *msg)
! 130: {
! 131: pid_t pid, pgid;
! 132: struct proc *p;
! 133: struct pgrp *pgrp;
! 134:
! 135: pid = (pid_t)msg->data[0];
! 136: pgid = (pid_t)msg->data[1];
! 137:
! 138: if (pgid < 0)
! 139: return EINVAL;
! 140:
! 141: if ((p = proc_find(pid)) == NULL)
! 142: return ESRCH;
! 143:
! 144: if (p->pgrp->pgid == pgid)
! 145: return 0;
! 146:
! 147: pgrp = pgrp_find(pgid);
! 148: if (pgrp == NULL) {
! 149: /*
! 150: * Create new process group
! 151: */
! 152: pgrp = malloc(sizeof(struct pgrp));
! 153: if (pgrp == NULL)
! 154: return ENOMEM;
! 155: list_init(&pgrp->members);
! 156: pgrp->pgid = pgid;
! 157: pgrp_add(pgrp);
! 158: }
! 159: else {
! 160: /*
! 161: * Remove from old process group
! 162: */
! 163: list_remove(&p->pgrp_link);
! 164: }
! 165: list_insert(&pgrp->members, &p->pgrp_link);
! 166: p->pgrp = pgrp;
! 167: return 0;
! 168: }
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