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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: }